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Publication numberUS2604207 A
Publication typeGrant
Publication dateJul 22, 1952
Filing dateFeb 1, 1949
Priority dateFeb 1, 1949
Publication numberUS 2604207 A, US 2604207A, US-A-2604207, US2604207 A, US2604207A
InventorsScott Walter J
Original AssigneeScott Walter J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for separating magnetic material
US 2604207 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

July 22, 1952 w, J SCOTT 2,604,207

APPARATUS FOR SEPARATING MAGNETIC MATERIAL Filed Feb. 1, 1949 1 W III-lI IIIIIlllIlllllllllllllllllllllIllllll|lllllll| 3mlmmxaxmxmxmxmxmxmimxmlmxm JNVENTOR. WA/fEr' 1/, 5130f) Patented July 1952 Q t. APPARATUS FOR SEPARATING MAGNETIC MATERIAL 'Walter 'J Scott, Portland, Oreg. Application February 1, 1949, Serial No. 73,894

1 The-present invention has to do with the magnetic separation of valuable components of materials found in many types and forms. For example, in many sections there are tremendous "(repeats-smack sand, composed principally of silicates Yand magnetite with smaller percentages of such desirable elements" as gold; scheelite, ga-

lena, titanium oxides; tin 'oxides and platinum.

'Other'types of materials which maybe'treated inaccordanceswith my process are of the rock ore type bearing small percentages of gold; silver, platinum or other valuable minerals, which ores may be finely crushed and treated inaccordance with my process, provided thata portionfjofthe ore comprises magnetic materials.

Whether the material to be treated is found originally'in the form of'placer sands or solid bodies of ore which; are crushedand ground as 'a'pre- 'liminary to separation, an expensive, time-consuming step. in the recovery of the valuable components heretofore has been the requirement that the mineral must be dried in order that separation may be accomplished; An object of 'my invention is to eliminate this costly step, making it possible to achieve, separation with the material'lemaining in its original'wet condition." By

the use of my process magnetic sands may be sluiced ordredged-from a riverbed or coastal shelf and passed through the separator in the condition in which they are drawn from the placer-deposits. With the use of my process and apparatus the magnetic material may be entirely removed-before the sand is passed through the usual r'ifiles'when the-object is to obtain gold or the like fr'om the sand. In passing gold-bearing blacksand through a rifile device in accordance with' the prior practices, I have noted that the rifiles are rapidly clogged by the magnetite or similar heavy particles, since their specific gravity is such as to cause them to settle behind riffle barsf Goldparticles in such sands are usually Thus, ev'en'though the riflie does not appear to be dangerously filled, a great deal of the valuable elements arelost shortly after a riflie is placed in operation in a black sand area. With my invention themagnetite and othermagnetic'materials are entirely eliminated before the lighter, nonmagnetic materials such as. quartz sand are 1 Claim. (Cl. 209-218) passed through the riflle device, with the result that a high efficiency is achieved.

In other types of mining operations the object of my invention is to recover magnetic materials which have value in themselves. It may not pay to recover magnetite as a source ofiron orsteel, but in many. instances such sands contain minor percentages of oresof valuable elements suchas tin or titanium which havethe'property of being attracted magnetically but to a lesser extent than magnetite. v I am aware that many attempts have been made in the past to separate such material from the gangue by the use of magnetic separators, either wet or dry, and either singly or arranged in series of separators with different separating eflects. However, it has'been my observation that no such prior separating apparatus or process is successful, and I have concluded that it is due primarily to the tendency of the magnetic particles to build up clots of cohered particles which bind within themselves the non-magnetic or lesser magnetic particles, or form shelves or projections upon which the non-magnetic or lessermagnetic particles are supported, with the result that unwanted materials are trapped with the desired materials. With my invention I am able to cleanly separate relatively magnetic materials from relatively non-magnetic materials, either aggregating all materials having some degree of magnetism, or separating only a certain material having a certain degree of magnetic properties. I am thus able entirely to separate the unwanted magnetic materials from gold, platinum or silver-bearing quartz sand which may later be passed through riflles, or {first to separate magnetite from material bearing other ores of magnetic property which are desired and then to separate the other magnetic materials either from the residue which remains after separating the magnetite or from the magnetite itself. The present invention is extremely rapid in operation and adds very little to the cost of equipment necessary to dredge or mine and crush the value-bearing materials.

The objects and advantages of the present invention may be more readily understood by inspection of the following specification taken in connection with the accompanying drawing wherein like numerals refer to like parts throughout, while the features of novelty will be'more distinctly pointed out in the appended claim.

The drawing illustrates a schematic represen tation of a preferred embodiment of the mechanism by which the process is carried out. In the drawing a relatively deep tank I0 is filled 3 with a liquid, preferably water, as indicated, and the sand or crushed ore is directed downwardly into the relatively quiescent water through an inlet II, the sand or crushed ore preferably being carried along by a stream of water such as would be produced by the usual hydraulic dredge;

The Water level in the'tank is maintained fairly constant by regulating an adjustableoutlet 12 in the-bottom of thejta'nk. 7

At one side of the tank is located a pair of transverse drums I5, one located above the other, 5

either one or both of which may be driven by -power means (not shown); The drums".

are preferably provided with teeth or cogson" their surfaces capable of engaging a series of magnets I S strung together on a chain or chains H which are, receivable in guiding grooves .(not

shown) in the surfaces of the drums. The chains are endless and pass about the drums 15 so that an endless magnetic belt is thus provided. The

'magnets may be permanent magnets: or electromagnetic magnets supplied; with current in any ordinary fashion; An endless belt lil is trained about thedrums l5iand'o ffset drum" IS aBd'gfuide roll 20 so as to provideia portion'projecting laterally fromf'above t l e Ito'p" of the'tank. "liiagnetic material which is attracted to the upwardly traveling reach of the belt i3 by thema'gnetsflfi is held to the belt 'until the horizontal portion thereof is reachedwhereu'pon the belt leaves the area of magnetic attraction but the materialremains supported upon the horizontal section. 'As I the. belt travels about the drum l9 the'magnetic material falls into a hopper or chute, the action being augmented by a doctor blade or section of the hopper wall 2! scraping the returning portion of the belt. "The belt then travels'downwardly through the tank and the cycle is repeated. I In accordance with the-preferred embodiment of my invention, the distance between the drums "ble 'fal sewall 25, thepositi'on of which '-relative I5 is considerable so that as the sands settle'vertically through the water column alongside of the upwardly traveling belt the. magnetic, particles have sufiicient opportunity to be attractedlaterally. toward the magnets. In the event that-the purpose of the apparatus is to separate black sand from non-magnetic materials including gold flakes, perfect separation can be achieyediparticularly since the gold flakes flutter downwardly" through the water, turning from side to side just .as a dish settles into a body of water. In 7.

of lesser magnetic value to escape through the outlet I2. In a second operation, or in. aiseparate separator locatedinseries with the first one, the materials of lesser magnetic quality may then be separated from m so -ma n t c ma e a ,suchas quartz and clay; similarly, one material of lesser magnetic property than magnetit may be. separated from a second-niateriahor even lesser magnetic properties.

The degree of separation. may 'alsobe affected by shifting the relativeposition of the inlet H the position thereof being dictated in accordance atnolt-ime being 4 with the particular qualities of the material being treated. If it is desired to separate all magnetic materials which can be separated, the inlet H may be placed close to the upper extremity of the belt so that by the time the particles have reached the lower extremity of the belt only non-magnetic particles remain in suspension in thewater. If it is placed further away the apparatus maybe caused'to' separate only a magnetic material of a certain degree of magnetic strength. Similar results may be obtained by "altering the depth of the water.

Similar effects, to a'certain extent, may be achieved by controlli'ng the speed of travel of the belt, but it is preferred that the other means of achieving con trol 'be' utilized since increasing the speed beyond a certain point results in inefficient operation since the friction of the water washes material from the belt. A further degree of control maybe achieved-by providing an adjustato the wall facing the'upwardly traveling section of belt may be controlledflbyadjustment screws I 26; The purposeof the false wall is to confine the material toa relatively small portion of the tank so that there will be no tendency for material to; escape themagnetic field. However, in some fca'sesiit may be desirable to move the inlet II as faras possible away from the magnetic field, in which'case the wall'25might have to be similarly moved awayv fr'qmthemagnets. w

' ,The' presentinve'ntion has the distinction over all, prior apparatus within my knowledge in that themethodjembodiedtherein has the following characteristics; The m'aterial to be separated fall's; dov'smwa'rdly through a body of Water in free suspensionthere'in'and the material which is magnetically attracted to'the' magnetic portion'of' the apparatus is removed vertically upward in a thin sheet without clots, .fingers' or shelves of material holding within or upon themselves undesired Vmaterial-sp The apparatus is preferably controlled in any of the foregoing manners, so as-to prevent morethan the accumulation of a thin coating. or' sheetof magnetic material whichis incapable of holdingthe non-magnetic particles. Eurther than that the point of greatest accumulation is immediately adjacent the inlet to the tankso that only very ,strongly magneticmaterials will be. immediately tra ted t -.t e; e p ent ing h wat The result: isthat; at the lower extremity of the upwardly traveling sectionof; the belt avery, thin 7 layer of material beginsto-accumulate; this-layer increasing to its maximum extent-adjacent the point ;of' entry ofjtheundivided material, v.but

built-up to an undesirable extent. j

Having illustrated and described a preferred embodiment of my invention, it should be apparent to those skilled'in the art that thein- 'ventionpermits of modification in arrangement and details; 'I claim as myinvention allsuch modifications as come within the true spiritand scope-.ofithe appended claim.

Iclaim: g g;

Apparatus for effecting the separation of fine, relatively magnetic. and non-magnetic;particles comprisinga relatively deep-tank, an inlet{at thetopof; said-tankthroughwhich a mixtureof particlesmay be introducedina liquid carrier, an outlet fat' .thelbottom Ofjtlidtank capable Ioflpermitti'ngthfe escape ofliquid equal to the amount introduced with the'material whereby to'maintain'a fairly constant depth of relatively quiescent liquid in the tank, said inlet being arranged to direct the material into the top of the liquid in the tank whereby the particles may travel in freely falling suspension downwardly through the liquid in the tank, a traveling belt having a vertical portion thereof traveling upwardly through the'liquid in the tank at one side of the path of free falling movement of the particles, a closely spaced series of magnets traveling with said belt in close proximity thereto at the side of said vertical portion of the belt away from the falling particles for creating a magnetic field through which the particles fall whereby magnetic particles are attracted to and held onto the upwardly traveling portion of the belt, and means for guiding a portion of said belt laterally from the upper region of said tank whereby particles removed from suspension by the traveling belt may be removed from the belt.


6 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 228,329 Edison June 1, 1880 466,515 Reed Jan. 5, 1392 529,188 Pike Nov. 13, 1894 954,016 Bent Apr. 5, 1910 1,146,140 Dutton July 13, 1915 2,088,364 Ellis July 27, 1937 2,290,892 Queneau July 28, 1942 2,437,681 Crockett Mar. 16, 1948

Patent Citations
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US228329 *Apr 7, 1880Jun 1, 1880 Thomas a
US466515 *Apr 6, 1891Jan 5, 1892 Ore-separator
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US2088364 *Sep 22, 1934Jul 27, 1937Ellis Edwin EElectromagnetic separator device
US2290892 *Nov 15, 1940Jul 28, 1942Jean Queneau Augustin LeonWet magnetic separation
US2437681 *May 27, 1943Mar 16, 1948Crockett Robert ESubmerged-belt type magnetic separator
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2738876 *Jun 12, 1951Mar 20, 1956Prater Pulverizer CompanyMagnetic separating means and transporting device
US2759606 *Dec 31, 1952Aug 21, 1956Nippert Electric Products CompMagnetic oil cleaner for screw machine
US2798800 *Mar 1, 1954Jul 9, 1957Modoc Peat Moss CompanyProcess of compositing municipal refuse in windrows
US2804162 *Oct 25, 1954Aug 27, 1957Aloys SchirpFilter
US2832311 *Jan 10, 1956Apr 29, 1958Haloid CoApparatus for development of electrostatic images
US3017031 *Sep 30, 1957Jan 16, 1962Infilco IncMagnetic separator
US3257081 *May 21, 1962Jun 21, 1966Libbey Owens Ford Glass CoRecovery of waste grinding materials
US3756401 *Sep 29, 1970Sep 4, 1973Hazemag HartzerkleinerungMagnetic system for separation of iron from refuse
US4042492 *Jan 5, 1976Aug 16, 1977Klockner-Humboldt-Deutz AktiengesellschaftApparatus for the separation of magnetizable particles from a fine granular solid
US4340468 *Nov 6, 1980Jul 20, 1982The United States Of America As Represented By The United States Department Of EnergyMethod and apparatus for separating materials magnetically
US4512879 *Jul 20, 1983Apr 23, 1985Battelle Development Corp.Process for producing a metalliferous concentrate from a particulate feed material
US5171424 *Oct 22, 1990Dec 15, 1992Ashland Oil, Inc.Magnetic separation of old from new cracking catalyst by means of heavy rare earth "magnetic hooks"
US5190635 *Oct 17, 1991Mar 2, 1993Ashland Oil, Inc.Superparamagnetic formation of FCC catalyst provides means of separation of old equilibrium fluid cracking catalyst
US5538624 *Oct 21, 1994Jul 23, 1996Ashland Inc.Process, apparatus and compositions for recycle of cracking catalyst additives
US8323507 *Aug 18, 2006Dec 4, 2012Qiagen, GmbhDevice and method for the elimination of magnetic particles from a liquid
US8505734Dec 1, 2010Aug 13, 2013David C. WiseApparatus for removing magnetic materials
US20090206039 *Aug 18, 2006Aug 20, 2009Thomas RothmannDevice and method for the elimination of magnetic particles from a liquid
DE1810334B1 *Nov 22, 1968Jul 20, 1972Goeppinger Magnetfabrik Carl SVorrichtung zum herausfoerdern ferromagnetischer werkstuecke
U.S. Classification209/218, 209/232, 210/534, 209/39, 210/223
International ClassificationB03C1/18, B03C1/02
Cooperative ClassificationB03C1/18
European ClassificationB03C1/18