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Publication numberUS3667688 A
Publication typeGrant
Publication dateJun 6, 1972
Filing dateNov 16, 1970
Priority dateJun 28, 1968
Publication numberUS 3667688 A, US 3667688A, US-A-3667688, US3667688 A, US3667688A
InventorsIannicelli Joseph
Original AssigneeHuber Corp J M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for shearing solids in a solids-liquid suspension
US 3667688 A
Abstract
A method for dis-aggregating solid particles in a slurry by pumping the slurry at pressures in excess of 1,000 p. s. i. through a column containing particulate media clamped in a fixed position is disclosed.
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Description  (OCR text may contain errors)

United States Patent Iannicelli 1 June 6, 1972 METHOD FOR SHEARING SOLIDS IN A SOLIDS-LIQUID SUSPENSION Inventor: Joseph Iannicelli, Macon, Ga.

Assignee: J. M. Huber Corporation, Locust, NJ.

Filed: Nov. 16, 1970 Appl. No.: 89,973

Related US. Application Data Division of Ser. No. 740,955, June 28, 1968, Pat. No. 3,556,416.

U.S. CI ..241/1, 241/30 Int. Cl. ..B02c 19/00 Field ofSearch... ..241/l,5,15,30

ZO K

Primary Examiner-Granville Y. Custer, Jr. Attorney-Harold H. Flanders 5 7] ABSTRACT A method for dis-aggregating solid particles in a slurry by pumping the slurry at pressures in excess of 1,000 p. s. i.

through a column containing particulate media clamped in a fixed position is disclosed.

4 Claims, 10 Drawing Figures PATENTEUJUH s 1972 SHEET 1 OF 2 METHOD FOR SHEARING SOLIDS IN A SOLIDS-LIQUID SUSPENSION CROSS-REFERENCE TO RELATED APPLICATION This is a division of application Ser. No. 740,955, filed June 28, 1968 now US. Pat. No. 3,556,416 issued Jan. 19, 1971.

BACKGROUND OF THE INVENTION In general, the present invention relates to solid-liquid suspensions and more specially to a method for shearing solids in such suspensions.

In particular, the invention relates to the method for reducing the size of particles suspended in a slurry by forcing the slurry through a column packed with relatively coarse, hard, substantially non-deformable, non-flowable discrete aggregates including both abrasive as well as non-abrasive material in a wide variety of geometric shapes.

The high pressure pumping of slurries to shear the slurries and effect changes in the characteristics of the solids is, of course, well known. Such pumping has been used for processes such as homogenization, dispersion of solids in fluids, reduction in viscosity and reduction in particle size. In such uses, a resiliently biased orifice valve is used to retard the flow of slurry from the pump to build pressure in the pump and force the slurry at extremely high velocities through an orifice in a relatively thin film. In each of these uses the very high velocity of the slurry is such that the valve is quite quickly eroded away and must be replaced after a very short useful life.

Pumping as described above is, however, extremely efficient and even with the high maintenance cost in valve replacement is one of the most efficient shear apparatus now available.

Accordingly, it is an object of the present invention to provide a new, highly effective method which overcomes the deficiencies of the prior art as described above while retaining at least a like efficiency of operation.

It is a further object of the present invention to provide a method which will reduce the cost of the shearing operation in a solid-liquid suspension.

Another object of the present invention is to provide a method of operation for achieving shearing in solid-liquid suspensions having increased reliability.

Other objects and a fuller understanding of the present invention may be had by referring to the following description and claims taken in conjunction with the accompanying drawings.

SUMMARY OF THE INVENTION The present invention overcomes the deficiencies of the prior art and achieves its objectives by providing a packed column of hard substantially non-deformable, relatively coarse particle size aggregates which provide a plurality of tortuous passages through which a suspension of solids in a liquid is pumped at an inlet pressure in excess of 1,000 p. s. i. In passing through the tortuous passages a very rapid acceleration to very high velocities takes place. At the same time the suspension is exposed to an extreme turbulent condition combined with shear, cavitation and impact as it impinges on the surrounding aggregates. The process produces a dispersion of reduced particle size which in some materials such as kaolin clay may result from dis-aggregation and delamination.

BRIEF DESCRIPTION OF THE DRAWINGS In order to facilitate the understanding of the present invention, reference will now be made to the appended drawings. The drawings should not be construed as limiting the invention, but are exemplary only. In the drawings:

FIG. 1 is a perspective view of a high pressure pump.

FIG. 2 is a vertical cross-section taken through the column.

FIG. 3 is verticalcross-section taken along the line 3-3 of FIG. 2 looking in the direction of the arrows.

FIG. 4 is a plan view of a screen support.

FIG. 5 is a vertical cross-section taken along the line 5-5 of FIG. 4 looking in the direction of the arrows.

FIG. 6 is a plan view of the face of the screen support opposite the face illustrated in FIG. 4.

FIG. 7 is a plan view of the lower clamp member shown partially in section for convenience of illustration.

FIG. 8 is an end view of the structure illustrated in FIG. 7.

FIG. 9 is a side elevation of the upper clamp member and FIG. 10 is an end view of the structure illustrated in FIG. 9.

Referring now to the drawings in detail wherein like reference characters indicate like parts throughout the several figures.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus suitable for carrying out the present invention is shown generally in FIG. 1 in which the reference numeral 20 indicates generally a high pressure pump which may be used in accordance with the present invention.

The high pressure pump 20 may be of any type developing in excess of about 1,000 p. s. i. with the pump illustrated being a Sub Micron Disperser Model 2050-MC45-5TBS as manufactured by Manton-Gaulin Manufacturing Company, Inc., Everett, Massachusetts. The pump, shown here for purposes of illustration, is of a conventional piston cylinder type and has a column block 21 secured to the outlet 22 thereof. A bypass valve 23 communicates with the outlet end of the pump 20 and is controlled through a hydraulic line 24 to vary the pressure at which the bypass valve 23 will release. The bypass valve 23 is of conventional construction. The bypass or relief valve may be a hydraulically loaded homogenization type valve or a spring loaded release valve or similar device. Obviously, any suitable pump capable of achieving the desired pressures may be employed in accordance with the teachings of the present invention as a matter of choice. In particular, a piston cylinder type pump need not be employed. Other type pumps such as those of the gas pressure or of the centrifugal type may be employed so long as they produce adequate pressure for the desired application.

The column block 21 is of generally rectangular cross section and is provided with a central bore 25 extending completely through the top end 26 and the bottom end 27 of the column block 21. An inlet bore 28 extends horizontally from the central bore 25 through the side wall of the column block 21 near the bottom end 27 thereof. A recessed seal 29 is arranged at the outer end of the inlet bore 28 and seals the column block 21 to the pump 20.

A threaded outlet bore 30 extends horizontally from the central bore 25 through the side wall of the column block 21 near the top end 26 thereof. The outlet bore 30 extends through the opposite side of the column block 21 from the inlet bore 28.

A lower clamp member 31 has a generally cylindrical body 32 having an annular O-ring groove 33 formed therein. A reduced diameter extension 34 is integrally formed on the body 32 and extends coaxially therewith. The clamp member 31 is fitted with an O-ring seal 35 seated in the O-ring groove 33. The O-ring seal 35 engagesthe surface of the bore 25 below the inlet bore 28 to prevent escape of pressure through the lower end of the bore 25.

A plate 36 is positioned in engagement with the lower end of the clamp member 31 and is secured to the column block 21 by a pair of threaded studs 37 and nuts 38 as can be seen in FIGS. 2 and 3.

While the above description of the column block has been provided for purposes of illustration it will be obvious to those skilled in the art that many variations of the column block and its cross-section may be employed while retaining its essential functions and without departing in substance from the teachings of the present invention.

A generally cylindrical screen support S is mounted in the bore 25 in engagement with the upper end of the extension 34. The screen support S has a plurality of bores 39 extending therethrough with their axes parallel to the axis of the support S. The bores 39 are arranged in a circle adjacent the cylindrical wall of the support S. One end face 40 of the support S is provided with a plurality of radially extending grooves 41 which each intersect one of the bores 39 and also intersect each other at the center of the support S.

A plurality of screens 42 of graduated mesh are mounted on the support S in engagement with the end face 40.

A body of particulate media 43 fills the central portion of the bore 25 supported on the screens 42. A second set of screens 42 and a support S engage the upper end of the body 1 of particulate media 43. An upper clamp member 44 has a cylindrical body 45 and a reduced diameter extension 46 integrally formed thereon and extending axially therewith.

A plate 47 is positioned against the upper end of the column The method of the invention is practiced generally by selecting a particulate media suitable for the purpose and packing the column block 21 with this media. The clamp member 31 is tightened until the media is clamped sufliciently tight to prevent virtually all motion between particles of the media during the practice of the invention.

A particulate solid dispersed in a fluid is then pumped at a pressure in excess of about L000 p. s. i. through the particulate media in the column block 21. The operation may be repeated for as many passes through the particulate media as is required to produce the desired properties in the end product.

The following examples teach several of the preferred embodiments of the invention.

block 21 and engages the upper end of the clamp member 44 EXAMPLE] and a recessed seal 48. The plate 47 is secured to the column A 68 5 s lids lu f f d l h block 21 by a pair of stud bolts 49 and nuts 50. The upper ole t 1 2 ay 2 2 clamp member 44 bears against the upper screen support S to and l 6 497 0 i f f g mlcrotis position it within the bore 25. Adjustment of the lower plate throu 02mm acied z zgi 36 by means of the nuts 38 exerts varying clamping pressure g p p a umma ceram'c th articulate media 43 and ma be ti htened as re uired beads 0H2 to 18 mesh m Size 8; thsfondifions y g q The resulting clay product had a particle size of 37.6 percent-2 i rons, 32.8 The above description of an apparatus suitable for carrying 10 g i percent s mlcmns and 13 7 percent t nv io utilizin su ort screens should not out the presen I l n g p The following table illustrate additional examples showing be understood to limit the present invention to such an art S if a" 1i ation will suffice to the materials used and the results obtained. rangemen R f m many.app c In Table I above the reference letters are explained as folorder the particle size of the particulate media in a decreasing lows manner the center of the column from each, h A. Tumblex 12 XM: A highly abrasive ceramic frit obtained the larger particles at each end of the column serving wholly from the Norton Company or in part to restrain the central particlesof the column. In B Tumblex A high alumina prism approximately general any name clampmg or restfmnfng means "S be fourth inch per side and three thirty-seconds inch thick utilized in lieu of the screens to function in accord with the obtained from the Norton company present invention. Further, as will become increasingly clear, LC Tumble, TL; Ceramic cylinders ya X obtained the present invention is in no way limited by the details of the f the Norton company P and p g mechanisms disclosed above y y of D. Plexiglass Rods: Cylinders as X 54; inch obtained from example, but any similar suitable means may be employed to a R h & H like end. E. 20 25 Mesh Ottawa Sand: Obtained from Ottawa Silica In carrying out the method of the present invention the c ,o pump 20 is operated in a normal manner to pump a fluid F. 7 -12 Mesh Alundum Beads: Alumina spheres obtained dispersion of particulate solid through the column 21 of from Minnesota Mining and Manufacturing. packed particulate media 43 at a predetermined pressure. The G. Talc: Equal parts of Nytal 200 and Nytal 300 tales obindividual particles of' the dispersed particulate solid are tained from Gouvenuer Talc Company. reduced in size by attrition, fracturing and delamination. Tables I and II illustrate the reduction in particle size of the TABLE I Percent -2 nii- Percent Pressure psi. crnns at 2 miicrccl it bcgi ncrons at Exmnplo Material treated solids l'm'ticulutn media 1st pass 2nd puss 3rd pass uiug finish 0 ll 1 '1 1' .llll '1'; "u 'lumlllnx 12x11 (1) 3.3011 31.1 30.

M iii Iii I L. 'i'll 'lumlllut 'llr (ll). 1 31,1 37, 1V V fin du 'lumhlvxll.(( 31.1 36,1 V 1 Product from Example l\" 7t) 7 (l p H n U 7 2 7! VI U Product from Example V 70 l0 I. 1 38.1 VII V Kaolin coarse filler grade". 70 lhixiglns's ltmls (l)) 31.1 32, Vlll Product from Exmnplcvll 70 .....(lo 32. 34.3 lX. Product from Example Vlll. 70 .0110 A, X Kaolin coarse llllcr grade 30 20 -25 mesh Ottawa. snml (E). 31.1 37, 1 XI Talc (G) 1O 7-121nusll uluudum heads (I") 1&1 11g; XII do 10 d0 15.2 1%,; XIII do 10 d0 16.4 1b.;

TABLE II Percent Percent; 2 n1i- 2 mi- Solids, Number crons at crons at Example Material treat-ed percent P.s.1 passes Particulate media beginning finish 2,700 1 Tumblox 12XM. 9.0 11.5, IX Talc s0.4s{ g 4 i2 lg? 1,700 16.2 18. 2,650 1 Tumblox 12 XM. 8. 5 0. 2 r r o X Feldspur 31.2 4 5:: {5 1,625 12. 5 13.11 1,650 11.4 11.0

1 9 XI Calcium carb01mte 36.3 l a; 1,450 10 12.5 12.0 2, 700 1 Tum blex 12 XM. 11. 2 13. 4 I) 1 XIL Nepholinc syenitru. 37. l 1. 000 18.1

TABLE III f....fii9 material treated with wide variations in the pressures, solids 1 2 2 553 53 2 2 3 content, particulate media and of the material treated.

Table III illustrates the reductions in viscosity which result from the practice of the invention. 5 In Table III the reference letters are explained as follows:

H. Diamonite one-fourth inch: one-fourth inch hi-density radius end fused alumina cylinders obtained from U. S. Stoneware. I. Hi-Density one-fourth inch Cyl: one-fourth inch fused alumina hi-density flat end cylinders obtained from U. S.

Stoneware.

J. Stainless Steel Balls one-fourth inch: one-fourth inch spheres of stainless steel obtained from U. S. Stoneware, 5 m 5' O O I to Q 0) 6 oi oi oi oi oi oi :60: Akron H H H H H H H K. Lucite Balls three-sixteenths inch: three-sixteenths inch spheres of polymethylmethacrylate obtained from Ace Plastic Co., Inc.

The examples demonstrate that the high pressure pumping of solids dispersed in a fluid through a column packed with particulate media will reduce the particle size of the dispersed solid and also reduce the viscosity of the treated material. Ezgggggzg In carrying out the invention any material exhibiting suita- H H ble properties of hardness, substantial non-deformability and available in durable, relatively coarse particle sizes may be employed to provide the plurality of tortuous passages through which the solid-liquid suspension is passed. Typical materials of suitable hardness include ceramic frits, alumina, sands, stainless steels, Lucite, Plexiglass, silicon oxides, tungsten carbide, titanium nitride, zirconium carbide, beryllium carbide, titanium carbide, silicon carbide, aluminum boride, boron carbide and the like.

The shape of the particles of the particulate media will generally be spherical, quasispherical, spheroidal, or 35 polyhedral and should not, in general, have many jagged edges since such edges lead to a knitting effect which increases the pressure requirements. This latter consideration is not intended to exclude, however, the use of such materials under certain operating conditions for specific suspensions where 40 the knitting effect is not significant or the increased pressure requirements are not significantly objectionable. Further, nothing above is meant to exclude any shape of particulate sec. per Brooksec. per 100 revofield cps. 100 rcv0- lutions '20 rpm. Hercules lutions 150 N0, 1 dyne units/ 150 r.p.m. g. wt." spindle r.p.m. g. wt. 18/670 18/660 18/845 18/010 18/855 18/045 18/840 18/870 18/815 18/035 18/850 18/915 18/850 18/750 18/705 18/940 18/910 field cps.

Hercules No. 1 dyne units/ spindle 20 r.p.m.

Number P s l of passes Particulate media 0 3, 1 Diam0nite%(H) 2, 2 .....do 3, l Hi-density cyl (I).... 2, 2 d0 2, 1 Stainless steel balls 2, 2 do 0 4, 1 Lucite balls ,45 (K)- vention as disclosed herein. For example, certain geometric combinations of tetrahedras, in addition to those naturally occurring, have been found quite satisfactory as a shape for the individual particles of the media in the operation of the present invention.

The length of the column through which the suspension is to be passed is proportionally related to the initial pressure and the amount of pressure drop across a given length of the column, with a large portion of the work on the solids in suspension believed to be performed in the initial portions of the column.

In addition to the single column shown, several obvious variations to one of ordinary skill in the art may be employed. For example, a single elongated column with decreasing particle size throughout may be used. Alternatively a single high pressure pump may be employed to force the suspension through a plurality of individual columns in a serial arrangement with each column packed with particles of decreasing size. Another alternative is the provision of a plurality of pumps each pump being placed just prior to respective members of a plurality of columns. An additional alternative is the 6 provision of a plurality of columns in a parallel arrangement for funneling the suspension through one or more columns of finer particle size. Any combination of the above arrangements may be employed or modified to meet the needs of the particular materials and exigency of the occasion.

As many passes of the material through a given column as are desired or required may be made to achieve the desired particle size and/or viscosity; however, in general, an excessive reduction in particle size by continued repeated passes will result in an undesirable increase in viscosity.

While the invention has been described with reference to its WK preferred embodiments, it will be understood by those skilled Percent solids Material treated pumped Hydrasperse (No. 2 coating grade clay) kaolin clay control. IIydrasperse kaolin clay. H dm'sbis' ir'a'diiiiii iitibijffIIIIIIIIIIIIIIIIIIIIII Hydrasperse kaolin clay. l8 dyne units is maximum torque recorded on viscometer; higher r.p.m. at 18 dyne units represents lower viscosity. "Lower time units per r. p.m. represents lower viscosity.

Example XIIL XIV XV .d0 XVI. do XVII do XVIII. .t d0 XIX do material which otherwise meets the needs of the present in-.

in the art that various changes may be made and equivalents substituted for elements and steps thereof without departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its essential teachings.

WHAT IS CLAIMED IS:

1. The method of reducing the particle size of a solid dispersed in a slurry comprising pumping the dispersion at a pressure in excess of 1,000 p.s.i. through a clamped body of a particulate media.

2. The method of claim 1 wherein the percent solids in the dispersion is in a range of from about 10 to about 80 percent.

3. The method of shearing and reducing the particle size of solids dispersed in a slurry by dis-aggregation, attrition, fracturing and delamination of the solids comprising:

a. providing a solids-liquid suspension wherein the percentage of solids is in the range of from about 10 to about 80 percent and wherein at least 8.5 percent of the solids have a particle size less than 2 microns and a predominant portion of which have a particle size less than 10 microns;

. restraining a particulate media comprising a plurality of hard, durable,. substantially non-deformable, non-flowable discrete particles a substantial portion of which have dimensions on the order of the particle size range of from about 25 mesh to about one-fourth inch within the central bore of a column; and

pumping said solids-liquid suspension at an inlet pressure in excess of 1,000 pounds per square inch through the

Patent Citations
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US1230013 *Jul 8, 1916Jun 12, 1917Joseph MorwitzHydraulic press.
US1934637 *Jul 18, 1930Nov 7, 1933Raffold Process CorpReduction of solids
US3199792 *Jul 20, 1962Aug 10, 1965Jr Robert W NorrisComminuting and dispersing process and apparatus
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US3556416 *Jun 28, 1968Jan 19, 1971Huber Corp J MApparatus for shearing solids in a solids-liquid suspension
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4232600 *Nov 28, 1977Nov 11, 1980Societe Civile HydromerProcess and apparatus for treating matter comprising a solid phase and a liquid or pasty phase
US4534388 *Jun 7, 1983Aug 13, 1985Pall CorporationDispersion system and method
US6520033 *Mar 29, 2000Feb 18, 2003Her Majesty The Queen In Right Of Canada, Represented By The Minister Of The EnvironmentApparatus for sampling & analysis of thermally-labile species and a method relating thereto
US7600703Aug 19, 2004Oct 13, 2009Resolution Chemicals LimitedParticle-size reduction apparatus and use thereof
US7644880May 2, 2005Jan 12, 2010Resolution Chemicals LimitedParticle-size reduction apparatus, and use thereof
US7861957Sep 2, 2009Jan 4, 2011Resolution Chemicals LimitedParticle-size reduction apparatus, and use thereof
US8052076Sep 23, 2010Nov 8, 2011Resolution Chemicals LimitedParticle-size reduction apparatus, and use thereof
Classifications
U.S. Classification241/1, 241/30
International ClassificationB02C19/00
Cooperative ClassificationB02C19/00
European ClassificationB02C19/00