CA1302396C - Particle wetting process and apparatus - Google Patents
Particle wetting process and apparatusInfo
- Publication number
- CA1302396C CA1302396C CA000598543A CA598543A CA1302396C CA 1302396 C CA1302396 C CA 1302396C CA 000598543 A CA000598543 A CA 000598543A CA 598543 A CA598543 A CA 598543A CA 1302396 C CA1302396 C CA 1302396C
- Authority
- CA
- Canada
- Prior art keywords
- vessel
- slurry
- primary
- water
- mixing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C9/00—General arrangement or layout of plant
- B28C9/002—Mixing systems, i.e. flow charts or diagrams; Making slurries; Involving methodical aspects; Involving pretreatment of ingredients; Involving packaging
- B28C9/004—Making slurries, e.g. with discharging means for injecting in a well or projecting against a wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/53—Mixing liquids with solids using driven stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/54—Mixing liquids with solids wetting solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
- B01F25/52—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle with a rotary stirrer in the recirculation tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/10—Maintenance of mixers
- B01F35/145—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means
- B01F35/1452—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
- B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
- B01F35/7544—Discharge mechanisms characterised by the means for discharging the components from the mixer using pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
- B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
- B01F35/75455—Discharge mechanisms characterised by the means for discharging the components from the mixer using a rotary discharge means, e.g. a screw beneath the receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/02—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing
- B28C5/06—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing the mixing being effected by the action of a fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/0875—Mixing in separate stages involving different containers for each stage
Abstract
ABSTRACT OF THE DISCLOSURE
A method of mixing particulate cement and water in a primary mixing vessel to form a slurry batch, includes introducing a measured quantity of water into the vessel, introducing a measured quantity of particulate cement into the vessel, agitating the water and cement in the vessel to form a slurry, and while continuing such agitating, pumping slurry from the lower interior extend of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, and employing wash water to wash remanent slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel.
A method of mixing particulate cement and water in a primary mixing vessel to form a slurry batch, includes introducing a measured quantity of water into the vessel, introducing a measured quantity of particulate cement into the vessel, agitating the water and cement in the vessel to form a slurry, and while continuing such agitating, pumping slurry from the lower interior extend of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, and employing wash water to wash remanent slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel.
Description
BAC~GROUND OF THE INVENTI~N
This invention relates generally to mixing of calcareous cement particles or powders, and water, for use in making concrete; and more particularly it concerns an unusually useful and efficient process, and associated apparatus, for performing the steps of the process, to effect efficient cement and water mixing, i.e. batching.
Problems associated with present dry cement, water and aggregate batching procedures, as in truck mounted rotary containers to which such ingredients are supplied, include: excessive cement dust formation and escape into the atmosphere; "balling" of cement particles and water ~i.e.
formation of unwetted cement agglomerates in partially wetted balls; and build-up of unwetted cement powder, as well as slurry, on rotary mixer surfaces). These also contribute to production of concrete mixes characterized by out-of-proportion ingredients, leading to reduced strength concrete. There is need for a precise, controlled, and otherwise highly efficient cement and water mixing or batching process that overcomes such problems and difficulties.
SUMMARY OF THE INVENTION
It is a major object of the invention to provide an improved and highly efficient process, and controlled system, that meets the above needs. Basically, the process of the invention involves use of a primary mixing vessel in which a cement and water slurry is produced, the process including the steps:
a) introducing a measured quantity of water into the vessel, b) introducing a measured quantity of particulate cement into the vesselr c) agitating the water and cement in the vessel to form a slurry, d~ and, while continuing said agitating, pumping slurry feom the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, e) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, f) and employing wash water to wash remanent slurry from surfaces in the primary mixing vessel and removing the wash water and remanent slurry from the primary vessel for flow to the auxiliary vessel.
Typically, multiple rotary agitators are employed in the vessel, and operated to create streams of slurry which impinge upon one another in that vessel; also, the agitators advantageously include upper and lower bladed agitators rotated in a direction or directions so that the upper agitator drives slurry in a stream toward the lower agitator, and so that the lower agitator drives slurry in a stream toward the upper agitator, whereby the two streams impinge upon one another. Enhanced wetting of cement particles can be obtained by evacuating air from the interior of the primary vessel after mixing of the water and cement, then rapidly re-admitting air to the primary vessel, thereby enhancing wetting of the cement particles in the slurry.
Further, a wash water holding tank is typically provided, and the method includes adding to that tank a fixed fraction of said predetermined amount of water, for use as said wash water. The water in the holding tank is pressurized, as by application of air pressure, for delivery of pressurized water streams to the vessel interior to wash down said surfaces in the primary mixing vessel.
The same pump as is used in a first mode for re-circulating slurry to the vessel interior, at high velocity, can also be employed in a second mode to rapidly pump the slurry from the cement and water batching vessel to an auxiliary vessel (such as the rotating container on a "ready-mix" truck), for mixing with aggregate (sand or rock~
delivered to that auxiliary vessel; and the amount of water added to the batching vessel can be reduced (under computer control) in proportion to the amount of water that is carried by wet sand in such aggregate, so as to arrive at an ultimate concrete mix with correct water content.
The ba~ching apparatus of the invention basically comprises:
a) a primary mixing vessel having cement and water inlet means, and slurry outlet means, b) means for introducing measured quantities of water and cement into the vessel, c) agitation means for agitating the cement and water in the vessel, thereby to form the slurry, d) means including a pump for removing a stream of slurry from the lower interior of the vessel and flowing said stream into the upper interior of the vessel, at high velocity, and for removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, e) and washing means including a wash water holding tank for supplying wash water to the interior of the vessel so as to wash remanent slurry from surfaces in that vessel for flow out of the primary vessel and to the auxiliary vessel.
Also provided is apparatus to produce agitation in the vessel, without need for rotating blades, and for removing cement dust from the vessel upper interior, to be re-introduced in a slurry re-circulation stream that acts to produce agitation.
These and other o~jects and advantages of the invention, as well as the details of an illustrative embodiment, will be more fully understood from the following specification and drawings, in which:
DRAWI~G DESCRIPTION
Fig. 1 is an elevation showing apparatus in accordance with the invention;
Fig. 2 is a right side elevation taken on lines 2-2 of Fig. 1, and partly broken away to show interior construction o~ the prin~ary mixing vessel;
Fig. 3 is a plan view taken on lines 3-3 of Fig.
l;
Fig. 4 is a left side eleva~ion taken on lines 4-4 of Fig. l;
4 ~
Fig. 5 is a block diagram sh~wing computer control of actuators and valves associated with the apparatus, and Fig. 6 is a block diagram showing operation of an auxiliary mixing vessel.
DETAILED DESCRIPTION
The apparatus seen in Figs. 1-4 includes an upright primary mixing vessel 10 having a cylindrical side wall 11, a top cover 12, and a tapering lower extension lla of wall ll. A water fill line 13 extends downwardly from a water storage tank 14, toward a water inlet 15 in cover 12.
Valve Vl in line 13 controls water egress from the storage tank 14, and a control valve V2 in and at the lower end of line 13 controls water admission to the vessel 10.
Calcareous cement in particle form (as for example Portland cement) is conveyed by screw con~eyor 16 toward a cement inlet 17 in cover 12. A drive Dl for the conveyor is operable and controlled, as by computer 19 seen in Fig. 5, to cause a measured amount of cement to be conveyed at 16 and introduced via inlet 17 into the vessel 10 immediately after a measured amount of wa~er is admitted to the vessel.
For this purpose, the vessel is mounted via load cells 21 to frame structure 22. The outputs of the load cells, represented by weight signal ~ (net of tare weight of the vessel) in Fig. 5, i8 transmitted to the computer, as shown.
Also, desired water weight ~1 and cement weight K2 settings are ~eyed into the computer, via keyboard K, as shown.
Initially, the computer opens valves Vl and V2 (via associated actuators also represented by the valve symbols) to admit water to the vessel lO. When the weight Wl of the admitted water reaches the pre-set or measured level Kl, as determined by comparison of signal values Kl and Wl, the valves Vl amd V2 are closed by the computer. Next, cement is deiivered into the vessel, for mixing with water, and for this purpose, the computer effects operation of drive ~l When the weight W2 of the admitted cement reaches the pre-set measured level K2 as determined by comparison of signal values K2 and W2, the drive Dl is stopped.
Also, provided is agitation means for agitating and thereby mixing the cement and water in the vessel, to ~orm a slurry, in which ~he cement particles are thoroughly wetted, for optimum strength concrete production. The agitation means, generally indicated at 25 in Fig. 2 includes multiple rotary agitators in the lower interior 26 of the vessel lO, i.e. inwardly of wall lower extension lla.
As shown, the agitators includes an upper bladed agitator 27 mounted on a vertical drive shaft 28, and a lower bladed agitator 29 also mounted on shaft 28, and extending directly below agitator 27. Shaft 28 extends upwardly and to the vessel exterior above the cover. A drive D2 including a motor is connected to the upper end of the shaft, and support bearing means for the shaft is seen at129. Suitable seals a~e also provided.
The blades 27a of the upper agitator are angled relative to horizontal so as to drive slurry in a downward stream 27b, and the blades 29a of the lower agitator are angled relative to horizontal and oppositely to the blades 29a of the upper agitator so as to drive slurry in an upward stream 29b toward the upper agitator. As a result the two streams impinge from one another fo~ enhancing wetting of the cement particles, and flow outwardly and downwardly as well as outwardly and upwardly. Also, vortexing flow in the vessel is substantially reduced, which also contributes to enhance wetting of the cement particles. If desired, the two bladed rotors can be separately driven. Each agitator typically includes four blades, and the agitator shaft may be rotated at between 140 and 180 RPM -- preferably about 160 RPM.
Furthermore, a pump P is carried at the bottom outlet 36 of the vessel to receive or remove a stream of slurry from the vessel and to flow the slurry via duct 38 into the mix at the upper interior of the vessel lO and at high velocity. Drive D3 including a motor serves to rotate the pump impeller at high speed (l,000 RPM, for example), to create the high velocity stream of slurry that is caused to impinge upon the slurry in the vessel, after being jetted tangentially relative to wall ll, from duct outlet 39, (Fig. 3). Further, agitation, and enhanced wetting of the cement particles is thereby achieved. Pump P is also operable in a second mode to pump slurry from the lower interior of the vessel and via duct ~0 to an auxiliary mixing vessel 41, after opening of a discharge valve V6 seen in Fig. 4. Vessel 41 is typically a rotating container on a ready-mix truck transporting concrete to a job site for pouring. Aggregate (sand and rock) is added in measured amount to the vessel 41, at 42.
Also Provided is washing means, including a wash water holding tank 43, for supplying pressurized wash water to the interior of the vessel 10, to wash remanent slurry from surfaces (such as wall surfaces and agitator surfaces) in the vessel. Such wash water and remanent slurry then flows to the auxiliary vessel via the pump P. A fixed or predetermined fraction (preferably about 5%) of the required water for the ultimate mix in vessel 41 is supplied to the holding tank 43, as via line 45 and valves V3 and V4 seen in Fig. 1, for use in washing down the interior surfaces as described. Three flushing lines 46 extend to spray nozzles 47 in the vessel upper interior, from a pipe or manifold 48 connected with lowermost interior of tank 43 as via a control valve V7. Also, a wash water line 50 extends from pipe 48 to the pump housing for washing pump surfaces free of remanent slurry. Computer 19 is programmed to open valve V7 t~ ~low or pass water to lines 46 and 5~, after all of the slurry has been pumped from vessel 10 to flow to vessel 41, at 40. A source of air pressure is shown at 210 and connected to tank 43. After completion of wash-down, valves V6 and V7 are closed.
All of the valves Vl-V7 may be operated by computer-controlled air-operated actuators. Fig. 2 also shows lines 61-64 connected to the water inlet duct 13, for passing selected additives or other admixture agents, to the vessel interior. Fig. 4 also shows a vibrator 68 connected to a cement supply silo 69 from which cement is conveyed to vessel 10. At such time as cement inlet gate valve Vs opens, just after completion of water input to vessel 10, the vibrator is energized so as to effect qravity flow of cement to the conveyor. At that time, the agitator drive is 13~2396 energized and the pump drive is also energized, under computer control. Alr pressure is also admitted to the holding tank. After completion of cement input to the vessel 10, Vs is closed, and the vibrator is de-energized.
For initial water input, valves Vl, V2, V3 and V4 are all opened simultaneously.
The apparatus and method to produce slurry (wet batching) can also be used in conjunction with dry batching.
Thus, a predetermined proportion of the ultimate mix in vessel 41 can be supplied by the wet batching process as described; and also, the balance of the ultimate cement and water mix in vessel 41 can be supplied by dry batching --i.e. loading dry cement and water directly into that vessel (see arrow 70, in Fig. 6).
Even further wetting of cement particles in the slurry can be effected by evacuating air from the interior of the primary vessel after mixing of the water and cement, then rapidly re-admitting air to the primary vessel, thereby enhancing wetting of the cement particles in the slurry.
See for example the air evacuation line 80 in Fig. 3, connected with the tank upper interior and leading to an evacuation pump P2. Air can be suddenly re-admitted to the tank by openin~ a valve V8 to 80, under control of the computer, as during the slurry mixing process.
Finally, a sensor 86 is associated with the computer for sensing the amount of water per unit volume of wet sand added to the auxiliary vessel 41, whereby the computer then calculates the diminished amount of water to be added to the vessel 10 in the first instance, as by , ~ ...
130Z3~6 control of valves Vl-V4, ~o that an ultimate correct formula mix is produced in vessel 41.
It 1~ also po~lbl- to o~lt aql~ator~ 27 and 29 or drivQ for such ~gitator6 and lnstead amploy the centrifugal pump P operated in 8uch a way that it6 lmpeller inlet ~ide, expo~ed to slurry ln the lower interior of the vessel 11, lnduces rotation~ of the lower slurry ln one rotary direction about the tank central vertlcal axis. At the 6ame time, the amount of ~lurry recirculated to the tank upper interior, via line 38, i8 controlled, and the slurry outlet nozzle 1~ directed 80 a~ to drive slurry in the upper interlor of the vessel in another rotary direction (~.e.
oppo~ite to 6ald one rot~ry direction, About ~XiB 80. As a result, the two oppo~it~ rot~ry 6tream~ lnterfere with one anoth~r ~B in ~hear, and a very high degree of particle ~tting i8 aChieVQd, a8 ls desirable ~or high ~trength ooncerte. ~n one example, about 10% o~ the slurry in the tank i~ contlnuously recirculated at 38. Also, the particle wetting effect 18 enhanced by creating a partial vacuum in the tan~ interior withdrawing air from tho tank upper ~nterior. In thi~ regard, void~ ad~cQnt cement and other particle~ created by 108g of air ar~ repl~ced by water.
Operatlon o~ the pump P it3elf may create ~ome o~ ~uch vacuum.
In another arrangement, means i8 provlded for a~pirating cement dust particle~ ~rom th~ upper lnterior of the ve~el 11, and for clrculating thQm to ths recirculated slurry, as in line 38. For thls purpose a line may extend upwardly from the top of the vessel, and bac~ downwardly to discharge aspirated air. A ~ranch line then connects to the side of the vent llne to aspirate ri~ing du~t particles ~idewardly from the ri~ing air strea~. The dust particles travel ln ths branch llne under vacuum created by slurry travel in line 38, to which the branch llne connects a8 at a venturi. Thus, no cement du~t i~ wasted, but i8 recirculated and fully utillzad.
This invention relates generally to mixing of calcareous cement particles or powders, and water, for use in making concrete; and more particularly it concerns an unusually useful and efficient process, and associated apparatus, for performing the steps of the process, to effect efficient cement and water mixing, i.e. batching.
Problems associated with present dry cement, water and aggregate batching procedures, as in truck mounted rotary containers to which such ingredients are supplied, include: excessive cement dust formation and escape into the atmosphere; "balling" of cement particles and water ~i.e.
formation of unwetted cement agglomerates in partially wetted balls; and build-up of unwetted cement powder, as well as slurry, on rotary mixer surfaces). These also contribute to production of concrete mixes characterized by out-of-proportion ingredients, leading to reduced strength concrete. There is need for a precise, controlled, and otherwise highly efficient cement and water mixing or batching process that overcomes such problems and difficulties.
SUMMARY OF THE INVENTION
It is a major object of the invention to provide an improved and highly efficient process, and controlled system, that meets the above needs. Basically, the process of the invention involves use of a primary mixing vessel in which a cement and water slurry is produced, the process including the steps:
a) introducing a measured quantity of water into the vessel, b) introducing a measured quantity of particulate cement into the vesselr c) agitating the water and cement in the vessel to form a slurry, d~ and, while continuing said agitating, pumping slurry feom the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, e) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, f) and employing wash water to wash remanent slurry from surfaces in the primary mixing vessel and removing the wash water and remanent slurry from the primary vessel for flow to the auxiliary vessel.
Typically, multiple rotary agitators are employed in the vessel, and operated to create streams of slurry which impinge upon one another in that vessel; also, the agitators advantageously include upper and lower bladed agitators rotated in a direction or directions so that the upper agitator drives slurry in a stream toward the lower agitator, and so that the lower agitator drives slurry in a stream toward the upper agitator, whereby the two streams impinge upon one another. Enhanced wetting of cement particles can be obtained by evacuating air from the interior of the primary vessel after mixing of the water and cement, then rapidly re-admitting air to the primary vessel, thereby enhancing wetting of the cement particles in the slurry.
Further, a wash water holding tank is typically provided, and the method includes adding to that tank a fixed fraction of said predetermined amount of water, for use as said wash water. The water in the holding tank is pressurized, as by application of air pressure, for delivery of pressurized water streams to the vessel interior to wash down said surfaces in the primary mixing vessel.
The same pump as is used in a first mode for re-circulating slurry to the vessel interior, at high velocity, can also be employed in a second mode to rapidly pump the slurry from the cement and water batching vessel to an auxiliary vessel (such as the rotating container on a "ready-mix" truck), for mixing with aggregate (sand or rock~
delivered to that auxiliary vessel; and the amount of water added to the batching vessel can be reduced (under computer control) in proportion to the amount of water that is carried by wet sand in such aggregate, so as to arrive at an ultimate concrete mix with correct water content.
The ba~ching apparatus of the invention basically comprises:
a) a primary mixing vessel having cement and water inlet means, and slurry outlet means, b) means for introducing measured quantities of water and cement into the vessel, c) agitation means for agitating the cement and water in the vessel, thereby to form the slurry, d) means including a pump for removing a stream of slurry from the lower interior of the vessel and flowing said stream into the upper interior of the vessel, at high velocity, and for removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, e) and washing means including a wash water holding tank for supplying wash water to the interior of the vessel so as to wash remanent slurry from surfaces in that vessel for flow out of the primary vessel and to the auxiliary vessel.
Also provided is apparatus to produce agitation in the vessel, without need for rotating blades, and for removing cement dust from the vessel upper interior, to be re-introduced in a slurry re-circulation stream that acts to produce agitation.
These and other o~jects and advantages of the invention, as well as the details of an illustrative embodiment, will be more fully understood from the following specification and drawings, in which:
DRAWI~G DESCRIPTION
Fig. 1 is an elevation showing apparatus in accordance with the invention;
Fig. 2 is a right side elevation taken on lines 2-2 of Fig. 1, and partly broken away to show interior construction o~ the prin~ary mixing vessel;
Fig. 3 is a plan view taken on lines 3-3 of Fig.
l;
Fig. 4 is a left side eleva~ion taken on lines 4-4 of Fig. l;
4 ~
Fig. 5 is a block diagram sh~wing computer control of actuators and valves associated with the apparatus, and Fig. 6 is a block diagram showing operation of an auxiliary mixing vessel.
DETAILED DESCRIPTION
The apparatus seen in Figs. 1-4 includes an upright primary mixing vessel 10 having a cylindrical side wall 11, a top cover 12, and a tapering lower extension lla of wall ll. A water fill line 13 extends downwardly from a water storage tank 14, toward a water inlet 15 in cover 12.
Valve Vl in line 13 controls water egress from the storage tank 14, and a control valve V2 in and at the lower end of line 13 controls water admission to the vessel 10.
Calcareous cement in particle form (as for example Portland cement) is conveyed by screw con~eyor 16 toward a cement inlet 17 in cover 12. A drive Dl for the conveyor is operable and controlled, as by computer 19 seen in Fig. 5, to cause a measured amount of cement to be conveyed at 16 and introduced via inlet 17 into the vessel 10 immediately after a measured amount of wa~er is admitted to the vessel.
For this purpose, the vessel is mounted via load cells 21 to frame structure 22. The outputs of the load cells, represented by weight signal ~ (net of tare weight of the vessel) in Fig. 5, i8 transmitted to the computer, as shown.
Also, desired water weight ~1 and cement weight K2 settings are ~eyed into the computer, via keyboard K, as shown.
Initially, the computer opens valves Vl and V2 (via associated actuators also represented by the valve symbols) to admit water to the vessel lO. When the weight Wl of the admitted water reaches the pre-set or measured level Kl, as determined by comparison of signal values Kl and Wl, the valves Vl amd V2 are closed by the computer. Next, cement is deiivered into the vessel, for mixing with water, and for this purpose, the computer effects operation of drive ~l When the weight W2 of the admitted cement reaches the pre-set measured level K2 as determined by comparison of signal values K2 and W2, the drive Dl is stopped.
Also, provided is agitation means for agitating and thereby mixing the cement and water in the vessel, to ~orm a slurry, in which ~he cement particles are thoroughly wetted, for optimum strength concrete production. The agitation means, generally indicated at 25 in Fig. 2 includes multiple rotary agitators in the lower interior 26 of the vessel lO, i.e. inwardly of wall lower extension lla.
As shown, the agitators includes an upper bladed agitator 27 mounted on a vertical drive shaft 28, and a lower bladed agitator 29 also mounted on shaft 28, and extending directly below agitator 27. Shaft 28 extends upwardly and to the vessel exterior above the cover. A drive D2 including a motor is connected to the upper end of the shaft, and support bearing means for the shaft is seen at129. Suitable seals a~e also provided.
The blades 27a of the upper agitator are angled relative to horizontal so as to drive slurry in a downward stream 27b, and the blades 29a of the lower agitator are angled relative to horizontal and oppositely to the blades 29a of the upper agitator so as to drive slurry in an upward stream 29b toward the upper agitator. As a result the two streams impinge from one another fo~ enhancing wetting of the cement particles, and flow outwardly and downwardly as well as outwardly and upwardly. Also, vortexing flow in the vessel is substantially reduced, which also contributes to enhance wetting of the cement particles. If desired, the two bladed rotors can be separately driven. Each agitator typically includes four blades, and the agitator shaft may be rotated at between 140 and 180 RPM -- preferably about 160 RPM.
Furthermore, a pump P is carried at the bottom outlet 36 of the vessel to receive or remove a stream of slurry from the vessel and to flow the slurry via duct 38 into the mix at the upper interior of the vessel lO and at high velocity. Drive D3 including a motor serves to rotate the pump impeller at high speed (l,000 RPM, for example), to create the high velocity stream of slurry that is caused to impinge upon the slurry in the vessel, after being jetted tangentially relative to wall ll, from duct outlet 39, (Fig. 3). Further, agitation, and enhanced wetting of the cement particles is thereby achieved. Pump P is also operable in a second mode to pump slurry from the lower interior of the vessel and via duct ~0 to an auxiliary mixing vessel 41, after opening of a discharge valve V6 seen in Fig. 4. Vessel 41 is typically a rotating container on a ready-mix truck transporting concrete to a job site for pouring. Aggregate (sand and rock) is added in measured amount to the vessel 41, at 42.
Also Provided is washing means, including a wash water holding tank 43, for supplying pressurized wash water to the interior of the vessel 10, to wash remanent slurry from surfaces (such as wall surfaces and agitator surfaces) in the vessel. Such wash water and remanent slurry then flows to the auxiliary vessel via the pump P. A fixed or predetermined fraction (preferably about 5%) of the required water for the ultimate mix in vessel 41 is supplied to the holding tank 43, as via line 45 and valves V3 and V4 seen in Fig. 1, for use in washing down the interior surfaces as described. Three flushing lines 46 extend to spray nozzles 47 in the vessel upper interior, from a pipe or manifold 48 connected with lowermost interior of tank 43 as via a control valve V7. Also, a wash water line 50 extends from pipe 48 to the pump housing for washing pump surfaces free of remanent slurry. Computer 19 is programmed to open valve V7 t~ ~low or pass water to lines 46 and 5~, after all of the slurry has been pumped from vessel 10 to flow to vessel 41, at 40. A source of air pressure is shown at 210 and connected to tank 43. After completion of wash-down, valves V6 and V7 are closed.
All of the valves Vl-V7 may be operated by computer-controlled air-operated actuators. Fig. 2 also shows lines 61-64 connected to the water inlet duct 13, for passing selected additives or other admixture agents, to the vessel interior. Fig. 4 also shows a vibrator 68 connected to a cement supply silo 69 from which cement is conveyed to vessel 10. At such time as cement inlet gate valve Vs opens, just after completion of water input to vessel 10, the vibrator is energized so as to effect qravity flow of cement to the conveyor. At that time, the agitator drive is 13~2396 energized and the pump drive is also energized, under computer control. Alr pressure is also admitted to the holding tank. After completion of cement input to the vessel 10, Vs is closed, and the vibrator is de-energized.
For initial water input, valves Vl, V2, V3 and V4 are all opened simultaneously.
The apparatus and method to produce slurry (wet batching) can also be used in conjunction with dry batching.
Thus, a predetermined proportion of the ultimate mix in vessel 41 can be supplied by the wet batching process as described; and also, the balance of the ultimate cement and water mix in vessel 41 can be supplied by dry batching --i.e. loading dry cement and water directly into that vessel (see arrow 70, in Fig. 6).
Even further wetting of cement particles in the slurry can be effected by evacuating air from the interior of the primary vessel after mixing of the water and cement, then rapidly re-admitting air to the primary vessel, thereby enhancing wetting of the cement particles in the slurry.
See for example the air evacuation line 80 in Fig. 3, connected with the tank upper interior and leading to an evacuation pump P2. Air can be suddenly re-admitted to the tank by openin~ a valve V8 to 80, under control of the computer, as during the slurry mixing process.
Finally, a sensor 86 is associated with the computer for sensing the amount of water per unit volume of wet sand added to the auxiliary vessel 41, whereby the computer then calculates the diminished amount of water to be added to the vessel 10 in the first instance, as by , ~ ...
130Z3~6 control of valves Vl-V4, ~o that an ultimate correct formula mix is produced in vessel 41.
It 1~ also po~lbl- to o~lt aql~ator~ 27 and 29 or drivQ for such ~gitator6 and lnstead amploy the centrifugal pump P operated in 8uch a way that it6 lmpeller inlet ~ide, expo~ed to slurry ln the lower interior of the vessel 11, lnduces rotation~ of the lower slurry ln one rotary direction about the tank central vertlcal axis. At the 6ame time, the amount of ~lurry recirculated to the tank upper interior, via line 38, i8 controlled, and the slurry outlet nozzle 1~ directed 80 a~ to drive slurry in the upper interlor of the vessel in another rotary direction (~.e.
oppo~ite to 6ald one rot~ry direction, About ~XiB 80. As a result, the two oppo~it~ rot~ry 6tream~ lnterfere with one anoth~r ~B in ~hear, and a very high degree of particle ~tting i8 aChieVQd, a8 ls desirable ~or high ~trength ooncerte. ~n one example, about 10% o~ the slurry in the tank i~ contlnuously recirculated at 38. Also, the particle wetting effect 18 enhanced by creating a partial vacuum in the tan~ interior withdrawing air from tho tank upper ~nterior. In thi~ regard, void~ ad~cQnt cement and other particle~ created by 108g of air ar~ repl~ced by water.
Operatlon o~ the pump P it3elf may create ~ome o~ ~uch vacuum.
In another arrangement, means i8 provlded for a~pirating cement dust particle~ ~rom th~ upper lnterior of the ve~el 11, and for clrculating thQm to ths recirculated slurry, as in line 38. For thls purpose a line may extend upwardly from the top of the vessel, and bac~ downwardly to discharge aspirated air. A ~ranch line then connects to the side of the vent llne to aspirate ri~ing du~t particles ~idewardly from the ri~ing air strea~. The dust particles travel ln ths branch llne under vacuum created by slurry travel in line 38, to which the branch llne connects a8 at a venturi. Thus, no cement du~t i~ wasted, but i8 recirculated and fully utillzad.
Claims (41)
1. The method of mixing particulate cement and water in a primary mixing vessel having an inverted lower frusto-conical interior, to form a slurry batch, that includes:
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry, comprising the steps of using an impeller inlet side of a pump exposed to lower slurry in the inverted lower frusto-conical interior of the vessel for inducing rotation of the lower slurry in one rotary direction about the vessel central vertical axis and, while continuing said agitating, pumping slurry from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, (d) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, and (e) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel.
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry, comprising the steps of using an impeller inlet side of a pump exposed to lower slurry in the inverted lower frusto-conical interior of the vessel for inducing rotation of the lower slurry in one rotary direction about the vessel central vertical axis and, while continuing said agitating, pumping slurry from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, (d) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, and (e) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel.
2. The method of claim 1 wherein multiple rotary agitators are employed in the primary vessel, and operating said agitators to create streams of slurry which impinge upon one another in that vessel.
3. The method of mixing particulate cement and water in a primary mixing vessel to form a slurry batch, and including multiple rotary agitators in the primary vessel comprising an upper agitator and a lower agitator below the upper agitator, the method including the steps of:
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry, (d) while continuing said agitating, pumping slurry from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, (e) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, (f) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel, and (g) rotating the agitators in a direction or directions so that the upper agitator drives slurry in a stream toward the lower agitator and so that the lower agitator drives slurry in a stream toward the upper agitator, whereby the two streams impinge upon each other in the vessel.
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry, (d) while continuing said agitating, pumping slurry from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, (e) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, (f) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel, and (g) rotating the agitators in a direction or directions so that the upper agitator drives slurry in a stream toward the lower agitator and so that the lower agitator drives slurry in a stream toward the upper agitator, whereby the two streams impinge upon each other in the vessel.
4. The method of claim 3 including flowing the pumped slurry to the primary vessel interior to flow in countercurrent relation to at least one of the streams created by said agitation.
5. The method of claim 1 wherein a wash water holding tank is provided, and including adding to said holding tank a fixed fraction of said predetermined amount of water, fox use as said wash water.
6. The method of claim 5 including pressurizing the wash water in the holding tank, for delivery in a pressurized stream or streams to the vessel interior to wash down said surfaces in the primary mixing vessel.
7. The method of claim 6 wherein air pressure is delivered to the holding tank after said predetermined amount of water is introduced to the primary vessel.
8. The method of mixing particulate cement and water in a primary mixing vessel to form a slurry batch, that includes:
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry, (d) while continuing said agitating, pumping slurry from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, (e) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, (f) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel, and (g) evacuating air from the interior of the primary vessel after mixing of the water and cement, then rapidly readmitting air to the primary vessel, thereby enhancing wetting of the cement particles in the slurry.
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry, (d) while continuing said agitating, pumping slurry from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, (e) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, (f) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel, and (g) evacuating air from the interior of the primary vessel after mixing of the water and cement, then rapidly readmitting air to the primary vessel, thereby enhancing wetting of the cement particles in the slurry.
9. The method of claim 1 including mixing the slurry delivered to the auxiliary vessel with aggregate delivered to the auxiliary vessel while transporting the auxiliary vessel to a concrete pour site.
10. The method of claim 9 wherein the amount of water added to the primary mixing vessel is less than the ultimate water content of the mix in the auxiliary vessel, by a differential equal to the water content of the aggregate added to the auxiliary vessel.
11. The method of claim 1 wherein said agitating of the water and cement in the vessel is effected by directing the slurry pumped to the upper interior of the vessel at an angle to drive slurry in an upper region of the vessel in one rotary path in the vessel.
12. The method of claim 11 wherein said pumping of the slurry from lower interior extent of the vessel is effected to induce slurry in a lower region of the vessel to travel in another rotary path in the vessel.
13. The method of claim 12 wherein the directions of said two rotary paths are generally opposite to each other.
14. The method of claim 13 wherein the two paths are about an upright axis in the vessel.
15. The method of mixing particulate cement and water in a primary mixing vessel to form a slurry batch, that includes:
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry, (d) while continuing said agitating, pumping slurry from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, (e) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, (f) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel, and (g) aspirating cement dust particles from the upper interior of the vessel for circulation into the slurry being pumped to the upper interior of the vessel.
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry, (d) while continuing said agitating, pumping slurry from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity, (e) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, (f) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel, and (g) aspirating cement dust particles from the upper interior of the vessel for circulation into the slurry being pumped to the upper interior of the vessel.
16. The method of claim 15 including separating air from the aspirated dust particles, and discharging such air.
17. Apparatus for mixing particulate cement and water to form a slurry batch that is then flowable to an auxiliary mixing vessel to which aggregate is supplied, comprising:
(a) a primary mixing vessel having an inverted lower frusto-conical interior, cement and water inlet means, and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry including lower slurry in the inverted lower frusto-conical interior of the vessel, the agitating means comprising means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, the pump having an impeller inlet side and an impeller outlet side, the inlet side being substantially larger than the outlet side and exposed to the lower slurry in the inverted lower frusto-conical interior of the vessel for inducing rotation of the lower slurry in one rotary direction about the vessel central vertical axis, and (d) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel.
(a) a primary mixing vessel having an inverted lower frusto-conical interior, cement and water inlet means, and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry including lower slurry in the inverted lower frusto-conical interior of the vessel, the agitating means comprising means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, the pump having an impeller inlet side and an impeller outlet side, the inlet side being substantially larger than the outlet side and exposed to the lower slurry in the inverted lower frusto-conical interior of the vessel for inducing rotation of the lower slurry in one rotary direction about the vessel central vertical axis, and (d) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel.
18. Apparatus for mixing particulate cement and water to form a slurry batch that is then flowable to an auxiliary mixing vessel to which aggregate is supplied, comprising:
(a) a primary mixing vessel having cement and water inlet means and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, wherein the agitation means includes multiple rotary agitators in the primary vessel and drive means to rotate the agitators thereby to create streams of slurry which impinge upon one another in that primary vessel, (d) means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, and (e) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel.
(a) a primary mixing vessel having cement and water inlet means and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, wherein the agitation means includes multiple rotary agitators in the primary vessel and drive means to rotate the agitators thereby to create streams of slurry which impinge upon one another in that primary vessel, (d) means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, and (e) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel.
19. Apparatus for mixing particulate cement and water to form a slurry batch that is then flowable to an auxiliary mixing vessel to which aggregate is supplied, comprising:
(a) a primary mixing vessel having cement and water inlet means, and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, (d) means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, and (e) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel, and the agitation means including multiple rotary agitators in the primary vessel, said agitators include an upper bladed agitator and a lower bladed agitator below the upper agitator, said drive means operating to rotate the agitators in a direction or directions such that the upper agitator drives slurry in a first stream toward the lower agitator and such that the lower agitator drives slurry in a second stream toward the upper agitator, whereby the two streams impinge upon one another for enhancing wetting of the cement particles.
(a) a primary mixing vessel having cement and water inlet means, and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, (d) means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, and (e) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel, and the agitation means including multiple rotary agitators in the primary vessel, said agitators include an upper bladed agitator and a lower bladed agitator below the upper agitator, said drive means operating to rotate the agitators in a direction or directions such that the upper agitator drives slurry in a first stream toward the lower agitator and such that the lower agitator drives slurry in a second stream toward the upper agitator, whereby the two streams impinge upon one another for enhancing wetting of the cement particles.
20. Apparatus as defined in claim 17 including means for adding to the holding tank a fixed fraction of the water introduced to the primary vessel, for use as said wash water.
21. Apparatus as defined in claim 20 including pressurizing means operatively connected to the holding tank to pressurize the water in that tank, thereby to enable delivery of said wash water in a pressurized stream or streams to the primary vessel interior to wash down said surfaces in that vessel.
22. Apparatus as defined in claim 21 wherein said washing means includes pressurized wash water spray nozzles in the upper interior of the primary vessel.
23. Apparatus as defined in claim 21 wherein said pressurizing means includes a source of air pressure operatively connected with said holding tank, and including control means for effecting pressurizing of the wash water in the holding tank subsequent to introduction of water to the primary vessel.
24. The apparatus of claim 17 including control means for operating the pump in a first mode to flow the slurry stream at high velocity into the upper interior of the primary vessel, and for operating the pump in a second and subsequent mode to remove slurry from the primary vessel and flow it to the auxiliary mixing vessel.
25. Apparatus for mixing particulate cement and water to form a slurry batch that is then flowable to an auxiliary mixing vessel to which aggregate is supplied, comprising:
(a) a primary mixing vessel having cement and water inlet means, and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, (d) means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, and (e) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel, and (f) first valving for controlling water and cement flow into the primary vessel;
(q) second valving for controlling flow to the holding tank of a fixed fraction of the water flow to the primary mixing vessel, (h) other valving to control operation of the pump in a first mode for flowing the slurry into the upper interior of the primary vessel and in a second mode for flowing the slurry to the auxiliary vessel, and (i) means including a computer to control operation of said first, second and other valving.
(a) a primary mixing vessel having cement and water inlet means, and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, (d) means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, and (e) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel, and (f) first valving for controlling water and cement flow into the primary vessel;
(q) second valving for controlling flow to the holding tank of a fixed fraction of the water flow to the primary mixing vessel, (h) other valving to control operation of the pump in a first mode for flowing the slurry into the upper interior of the primary vessel and in a second mode for flowing the slurry to the auxiliary vessel, and (i) means including a computer to control operation of said first, second and other valving.
26. Apparatus for mixing particulate cement and water to form a slurry batch that is then flowable to an auxiliary mixing vessel to which aggregate is supplied, comprising:
(a) a primary mixing vessel having cement and water inlet means, and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, (d) means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, and (e) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel, and (f) means for aspirating cement dust particles from the upper interior of the primary vessel for circulating into the slurry being pumped to the upper interior of the primary vessel.
(a) a primary mixing vessel having cement and water inlet means, and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, (d) means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow to said auxiliary mixing vessel for mixing with aggregate, and (e) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel, and (f) means for aspirating cement dust particles from the upper interior of the primary vessel for circulating into the slurry being pumped to the upper interior of the primary vessel.
27. The apparatus of claim 26 including means for separating air from the aspirated dust particles, and for discharging such separated air.
28. The method of claim 1 wherein the step of pumping the slurry along a path comprises the step of pumping the slurry through a duct to the upper interior of the vessel.
29. The method of claim 1 wherein the step of removing the slurry comprises the step of pumping slurry from the vessel at high speed to the auxiliary mixing vessel.
30. The method of claim 29 comprising the step of performing each of the steps of pumping with the same pump and diverting the slurry from the pump to the auxiliary vessel or to the upper interior of the vessel.
31. The method of claim 1 comprising the step of weighing the primary mixing vessel with the water and cement.
32. Apparatus as defined in claim 17 comprising a duct for passing the stream of slurry, separate from the slurry in the primary vessel, into the upper interior of the primary vessel.
33. Apparatus as defined in claim 17 wherein the pump pumps the slurry from the primary mixing vessel through the outlet means to the auxiliary mixing vessel at high speed.
34. Apparatus as defined in claim 17 comprising means for weighing the primary vessel with the water and cement.
35. Apparatus as defined in claim 25 wherein the other valving comprises valving adapted for directing the slurry drawn by the pump out of the primary vessel either into the stream back into the upper interior of the primary vessel or into a stream to the auxiliary mixing vessel.
36. Apparatus as defined in claim 26 comprising a duct for flowing the stream of slurry separate from the slurry in the vessel to the upper interior of the primary mixing vessel.
37. The method of claims 8, 11 and 15 wherein the step of pumping and delivering the pumped slurry comprises the step of flowing the pumped slurry separate from the slurry in the vessel through a duct to the upper interior of the vessel.
38. The method of mixing particulate cement and water in a primary mixing vessel, having an inverted lower frusto-conical interior, to form a slurry batch, that includes:
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry comprising the step of using an impeller inlet side of a pump exposed to lower slurry in the inverted lower frusto-conical interior of the vessel for inducing rotation of the lower slurry in one rotary direction about the vessel central vertical axis, and, while continuing said agitating, using the pump for pumping slurry along a path separate from the slurry in the vessel from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity.
(d) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, and (e) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel.
(a) introducing a measured quantity of water into the vessel, (b) introducing a measured quantity of particulate cement into the vessel, (c) agitating the water and cement in the vessel to form a slurry comprising the step of using an impeller inlet side of a pump exposed to lower slurry in the inverted lower frusto-conical interior of the vessel for inducing rotation of the lower slurry in one rotary direction about the vessel central vertical axis, and, while continuing said agitating, using the pump for pumping slurry along a path separate from the slurry in the vessel from the lower interior extent of the vessel and delivering the pumped slurry to the upper interior of the vessel, at high velocity.
(d) removing slurry from the vessel for flow to an auxiliary mixing vessel for mixing with aggregate, and (e) employing wash water to wash remnant slurry from surfaces in the primary mixing vessel for flow to the auxiliary vessel.
39. The method of claim 38 wherein the step of using an impeller inlet side of a pump comprises the step of using a pump inlet side of a pump which is substantially larger than the outlet side of the pump.
40. Apparatus for mixing particulate cement and water to form a slurry batch that is then flowable to an auxiliary mixing vessel to which aggregate is supplied, comprising:
(a) a primary mixing vessel having an inverted lower frusto-conical interior, cement and water inlet means and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel through the inlet means, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, including lower slurry in the inverted lower frusto-conical interior of the vessel, the agitating means comprising means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream separate from the slurry in the primary vessel into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow through the outlet means to said auxiliary mixing vessel for mixing with aggregate, the pump comprising an impeller inlet side and an impeller outlet side, the inlet side being substantially larger than the outlet side and exposed to lower slurry in the inverted lower frusto-conical interior of the vessel for inducing rotation of the lower slurry in one rotary direction about the vessel central vertical axis, and (d) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel.
(a) a primary mixing vessel having an inverted lower frusto-conical interior, cement and water inlet means and slurry outlet means, (b) means for introducing measured quantities of water and cement into the primary vessel through the inlet means, (c) agitation means for agitating the cement and water in the primary vessel, thereby to form the slurry, including lower slurry in the inverted lower frusto-conical interior of the vessel, the agitating means comprising means including a pump for removing a stream of slurry from the lower interior of the primary vessel and flowing said stream separate from the slurry in the primary vessel into the upper interior of the primary vessel, at high velocity, and for removing slurry from the primary vessel for flow through the outlet means to said auxiliary mixing vessel for mixing with aggregate, the pump comprising an impeller inlet side and an impeller outlet side, the inlet side being substantially larger than the outlet side and exposed to lower slurry in the inverted lower frusto-conical interior of the vessel for inducing rotation of the lower slurry in one rotary direction about the vessel central vertical axis, and (d) washing means including a wash water holding tank for supplying wash water to the interior of the primary vessel so as to wash remnant slurry from surfaces in that primary vessel for flow out of the primary vessel and to the auxiliary vessel.
41. The method of claim 1 wherein the step of using an impeller inlet side of a pump comprises the step of using a pump inlet side of a pump which is substantially larger than the outlet side of the pump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/194,227 US4830505A (en) | 1988-05-16 | 1988-05-16 | Particle wetting process and apparatus |
| US194,227 | 1988-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1302396C true CA1302396C (en) | 1992-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000598543A Expired - Lifetime CA1302396C (en) | 1988-05-16 | 1989-05-03 | Particle wetting process and apparatus |
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| Country | Link |
|---|---|
| US (1) | US4830505A (en) |
| JP (1) | JPH01294007A (en) |
| BE (1) | BE1003101A5 (en) |
| CA (1) | CA1302396C (en) |
| DE (1) | DE3914594A1 (en) |
| FR (1) | FR2631999A1 (en) |
| GB (1) | GB2218917B (en) |
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| US5119589A (en) * | 1986-07-24 | 1992-06-09 | National Research Development Corporation | Methods of priming seed |
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| US5103908A (en) * | 1989-09-21 | 1992-04-14 | Halliburton Company | Method for cementing a well |
| US5267792A (en) * | 1991-04-09 | 1993-12-07 | Neyra Industries, Inc. | Apparatus for transporting fluids having a high viscosity and method of dispensing the fluids therefrom |
| US5190374A (en) * | 1991-04-29 | 1993-03-02 | Halliburton Company | Method and apparatus for continuously mixing well treatment fluids |
| JPH07115346B2 (en) * | 1991-08-02 | 1995-12-13 | 株式会社鴻池組 | Mixer for cement paste and method for producing mortar and concrete |
| DE4217373C2 (en) * | 1992-05-26 | 2003-02-20 | Klaus Obermann Gmbh | Device for the preparation and preparation of mixtures or suspensions containing at least one liquid component |
| CA2114294A1 (en) * | 1993-01-05 | 1995-07-27 | Thomas Earle Allen | Apparatus and method for continuously mixing fluids |
| US5382411A (en) * | 1993-01-05 | 1995-01-17 | Halliburton Company | Apparatus and method for continuously mixing fluids |
| US5352035A (en) * | 1993-03-23 | 1994-10-04 | Hydromix, Inc. | Concrete mixing system with cement/water premixer |
| AUPM657894A0 (en) * | 1994-06-30 | 1994-07-21 | Hood, Max George | Method and apparatus for cement blending |
| US5813754A (en) * | 1996-03-13 | 1998-09-29 | Matrix Master, Inc. | Vibration input to moving aqueous cemetitious slurry |
| US6015225A (en) * | 1996-03-13 | 2000-01-18 | Matrix Master Inc. | Vibration input to moving aqueous cementitious slurry |
| US5947596A (en) * | 1997-06-10 | 1999-09-07 | U.S. Filter/Stranco | Dry powder batch activation system |
| DE19919859C2 (en) * | 1999-04-30 | 2002-08-22 | Guenter Slowik | Method and device for treating substance or mixture of substances located in a container, in particular by mixing or stirring processes, rotating around the container axis |
| US6361199B1 (en) * | 2000-03-29 | 2002-03-26 | Maxxon Corporation | Cement mixing apparatus and method |
| US7267473B2 (en) * | 2003-08-28 | 2007-09-11 | Solomon Colors, Inc. | Transfer system for coloring agents |
| ES2342245B1 (en) * | 2007-12-04 | 2011-05-12 | Dosificadores Garcia Fernandez, S.L. | CEMENT PREPARATION AND INJECTION MACHINE. |
| ES2338093B1 (en) * | 2009-11-26 | 2011-05-31 | Cavosa, Obras Y Proyectos, S.A. | PRODUCT MIXING DEVICE. |
| WO2012009192A1 (en) | 2010-07-15 | 2012-01-19 | Mallinckrodt Llc | Slurry dispenser for radioisotope production |
| US9908974B2 (en) * | 2014-04-30 | 2018-03-06 | Kureha Corporation | Polyarylene sulfide production method and polyarylene sulfide production apparatus |
| MX2017008664A (en) * | 2015-01-20 | 2017-10-11 | Halliburton Energy Services Inc | Dry powder blending. |
| CN105108904B (en) * | 2015-09-29 | 2018-01-05 | 杨高林 | A kind of cement mortar agitating device agitator movable lifting mechanism |
| CN106903792A (en) * | 2017-03-19 | 2017-06-30 | 安徽昆蒙新型建材有限公司 | The production method of non-load bearing tile |
| CN107774196B (en) * | 2017-11-17 | 2020-09-01 | 嘉兴市博宏新型建材有限公司 | Water based paint agitating unit that moisturizes |
| CN108453894B (en) * | 2018-01-19 | 2019-09-06 | 泉州味盛食品有限公司 | A kind of construction equipment |
| CN108214911B (en) * | 2018-01-19 | 2019-09-10 | 南安市好运来雨具有限公司 | A kind of construction equipment |
| CN108202410B (en) * | 2018-01-19 | 2019-09-10 | 南安市好运来雨具有限公司 | A kind of modified construction equipment |
| US11389990B2 (en) * | 2019-04-11 | 2022-07-19 | Donald A. Pope | Concrete mixing machine |
| CN110465224A (en) * | 2019-08-27 | 2019-11-19 | 天台婉枫电子有限公司 | A kind of sealing agent, sealing agent slurry producing device |
| CN110883943A (en) * | 2019-12-17 | 2020-03-17 | 刘洪� | Concrete mixing device for building of synchronous ration business turn over material realizes |
| CN112915842B (en) * | 2021-01-28 | 2022-12-06 | 无锡华虹建设有限公司 | Lime mortar mixing machine for interior decoration of building house |
| CN114378944B (en) * | 2021-12-26 | 2023-07-28 | 龙达建设(珠海)有限公司 | Slurry filling device for building construction |
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| US2316705A (en) * | 1939-11-07 | 1943-04-13 | Stanley John Morgan | Production of fluent cement or cement grout |
| US2432971A (en) * | 1945-03-31 | 1947-12-16 | United States Gypsum Co | Porous composition of matter and method of manufacture |
| US2549507A (en) * | 1947-12-13 | 1951-04-17 | Standard Oil Dev Co | Oil well cementing |
| US2629667A (en) * | 1949-12-27 | 1953-02-24 | Phillips Petroleum Co | Retarded set cement and slurries thereof |
| US2600018A (en) * | 1950-03-27 | 1952-06-10 | Truscon Lab Inc | Portland cement base paints |
| GB694117A (en) * | 1950-09-11 | 1953-07-15 | Colcrete Ltd | Improvements in cement mixers |
| US2700615A (en) * | 1951-04-04 | 1955-01-25 | Heijmer Gustaf Bristol | Plaster composition |
| US2718471A (en) * | 1952-08-01 | 1955-09-20 | Nat Plastic Products Company | Blending method and apparatus |
| US2684714A (en) * | 1953-08-25 | 1954-07-27 | Norris W Corey | Folding door |
| US2820713A (en) * | 1956-03-02 | 1958-01-21 | Tile Council Of America | Mortar compositions |
| US2959489A (en) * | 1957-11-12 | 1960-11-08 | Tile Council Of America | High temperature portland cement mortars |
| US3030258A (en) * | 1958-05-28 | 1962-04-17 | Tile Council Of America | Dry cement composition comprising portland cement, methyl cellulose, and polyvinyl alcohol, and method of installing tile with same |
| US3081983A (en) * | 1959-12-31 | 1963-03-19 | Thibodeaux Clifford | Concrete mixer |
| US3169877A (en) * | 1961-01-16 | 1965-02-16 | John A Bartoli | Mortar compositions |
| NO115522B (en) * | 1963-02-28 | 1968-10-14 | Mo Och Domsjoe Ab | |
| GB1116656A (en) * | 1965-07-01 | 1968-06-12 | Cellier Ets | Process and an apparatus for making homogeneous suspensions of kaolin |
| DE1557002A1 (en) * | 1966-03-28 | 1970-05-06 | Adox Du Pont Fotowerke | Method and device for redispersing coagulated substances in a liquid dispersion carrier |
| DE1683864A1 (en) * | 1967-04-26 | 1971-03-11 | Rudolf Kalich | Mixing container for the automatic mixing of hydraulically hardening binders |
| FR1570329A (en) * | 1967-07-01 | 1969-06-06 | ||
| DE1924594C3 (en) * | 1969-05-14 | 1972-03-30 | Nukem Gmbh | DEVICE FOR FILLING UP URANIUM COMPOUNDS FROM AQUATIC SOLUTION |
| DE2000201A1 (en) * | 1969-11-05 | 1971-05-13 | Hazet Zwickau Hartzerkleinerun | Device for cleaning mixing devices |
| GB1265115A (en) * | 1970-06-01 | 1972-03-01 | ||
| DK133544B (en) * | 1974-02-21 | 1976-06-08 | Demitas As | Installations for the production of concrete. |
| US3967815A (en) * | 1974-08-27 | 1976-07-06 | Backus James H | Dustless mixing apparatus and method for combining materials |
| US4039170A (en) * | 1975-09-08 | 1977-08-02 | Cornwell Charles E | System of continuous dustless mixing and aerating and a method combining materials |
| US4007921A (en) * | 1976-01-19 | 1977-02-15 | The Dow Chemical Company | Apparatus for mixing dry particles with a liquid |
| DE2649996A1 (en) * | 1976-10-30 | 1978-05-03 | Bayer Ag | PROCESS AND APPARATUS FOR PRODUCING A FILLER-CONTAINING REACTION MIXTURE FROM AT LEAST TWO FLOWABLE COMPONENTS, IN PARTICULAR FOR PRODUCING POLYURETHANE |
| US4185923A (en) * | 1977-07-11 | 1980-01-29 | Baker Donald E | Method and apparatus for producing insulating material |
| US4199547A (en) * | 1977-12-12 | 1980-04-22 | Irkutsky Gosudarstvenny NauchnoIssledovatelsky Institut Redkikh I Tsvetnykh Metallov "Irgiredmet" | Device for producing foam plastics |
| DE2919311B1 (en) * | 1979-05-14 | 1980-09-18 | Gert Prof Dr-Ing Habil Kossatz | Process for the production of gypsum components, in particular gypsum boards |
| SE428274B (en) * | 1980-04-08 | 1983-06-20 | Wahlbeck Sven Gunnar | PROCEDURE FOR MIXING CEMENT, WATER AND BALLAST |
| JPS583804B2 (en) * | 1980-07-12 | 1983-01-22 | 大平洋金属株式会社 | Concrete manufacturing method using a laminated pan type mixer |
| US4372352A (en) * | 1981-03-09 | 1983-02-08 | Olin Corporation | Foam dispensing apparatus |
| DE3117648C2 (en) * | 1981-05-05 | 1985-04-25 | Colcrete-Bau Gmbh & Co Kg, 2902 Rastede | Mixer for the production of colloidal cement mortar or concrete |
| DE3127858A1 (en) * | 1981-07-15 | 1983-02-03 | Stetter Gmbh, 8940 Memmingen | Water-supply and cleaning system for compulsory-type concrete mixers |
| US4448536A (en) * | 1982-08-09 | 1984-05-15 | Strong William A | Concrete mixer device |
| US4585486A (en) * | 1983-07-22 | 1986-04-29 | Hazama-Gumi, Ltd. | Process for placing cement composition having high strength |
| NL8302678A (en) * | 1983-07-27 | 1985-02-18 | Stork Brabant Bv | FOAM GENERATOR. |
| US4588299A (en) * | 1983-10-18 | 1986-05-13 | Alslur Enterprises Limited | Cement mixing process and apparatus |
| DE3436813C1 (en) * | 1984-10-06 | 1986-05-07 | Elba-Werk Maschinen-Gesellschaft Mbh & Co, 7505 Ettlingen | Device for flushing an additive balance in concrete preparation |
| US4705405A (en) * | 1986-04-09 | 1987-11-10 | Cca, Inc. | Mixing apparatus |
| GB8625715D0 (en) * | 1986-10-28 | 1986-12-03 | British Nuclear Fuels Plc | Colloidal grout mixing apparatus |
| US4764019A (en) * | 1987-09-01 | 1988-08-16 | Hughes Tool Company | Method and apparatus for mixing dry particulate material with a liquid |
-
1988
- 1988-05-16 US US07/194,227 patent/US4830505A/en not_active Expired - Fee Related
-
1989
- 1989-03-31 JP JP1081361A patent/JPH01294007A/en active Granted
- 1989-04-13 GB GB8908344A patent/GB2218917B/en not_active Expired - Fee Related
- 1989-05-03 CA CA000598543A patent/CA1302396C/en not_active Expired - Lifetime
- 1989-05-03 DE DE3914594A patent/DE3914594A1/en not_active Withdrawn
- 1989-05-12 FR FR8906304A patent/FR2631999A1/en active Pending
- 1989-05-12 BE BE8900518A patent/BE1003101A5/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2218917A (en) | 1989-11-29 |
| AU1387792A (en) | 1992-05-21 |
| US4830505B1 (en) | 1991-10-15 |
| GB8908344D0 (en) | 1989-06-01 |
| AU625638B2 (en) | 1992-07-16 |
| US4830505A (en) | 1989-05-16 |
| AU3134189A (en) | 1989-11-16 |
| AU632727B2 (en) | 1993-01-07 |
| DE3914594A1 (en) | 1989-11-23 |
| BE1003101A5 (en) | 1991-11-26 |
| FR2631999A1 (en) | 1989-12-01 |
| GB2218917B (en) | 1992-03-25 |
| JPH01294007A (en) | 1989-11-28 |
| JPH0585332B2 (en) | 1993-12-07 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |