US2582274A - Magnetic separator - Google Patents
Magnetic separator Download PDFInfo
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- US2582274A US2582274A US617711A US61771145A US2582274A US 2582274 A US2582274 A US 2582274A US 617711 A US617711 A US 617711A US 61771145 A US61771145 A US 61771145A US 2582274 A US2582274 A US 2582274A
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- annular
- rotor
- wall
- magnetic
- pole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
- B03C1/14—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with non-movable magnets
- B03C1/145—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with non-movable magnets with rotating annular or disc-shaped material carriers
Definitions
- the present invention relates vtotthe ⁇ vart of .magnetic separation,4 that .is .of lseparating mag- .'neticfromenonemagnetic .particles of. negranu- --lar. lorpowdered. ore. ⁇ or otherfcomminuted stock.
- Fig. .1a.fis ra rfragmentary detailed-fviewf show- ...ing .the-airtight housing
- Fg..2 isfa transverse fcrosssectional.view-taken ⁇ :.onwlf e: 2-.2-;of. Fig.;.1.
- v Eig..;;.3-f is'a .transverse-cross sectional view. taken on line 3-3 of Fig. 1,
- Thetwoelements .of the .magnet .eldistructure the upper .ofwhichhouses ,the co'il ..C, are Mdesir- .ablysecuredtogether .bymoreor less Couven-45 ftionall'ange piecesA l2. and. i3.about.their respec- "tverims, which are'bolted Atogetheras at4 l4 ⁇ .to
- electromagnet isdesirably 4.constructed .to aiorda ⁇ flux vthrough the. .gap G oi"..'the...maxirm1m. practicalintensitwi. e.. o ⁇ f. about u10,060 Gauss.
- the rotor Y is .desirabiy .mounte'don the upper v,end of anvupright' hollow ⁇ .driving vshaft 23 extending .axially vthrough the ..magnet structure, lodged "hall 0 lbearings 24 and '25, and A.driven @from a.. suitable u ⁇ source .of power (not shown), .as .'for instance ,througha'pulley .26 aboutthe' lowerlend.. ofithe said shaftv23.
- the pole vshield. isa ring'desirablybt not vnecessarily ⁇ of .non-magnetic materiaLv-preferably..
- the ridgebridging Web.32 of thepole shield" 21'. is preferably.substantially. inthe plane .of they feed rotorplate'Z'l.
- an interceptor ring 35 is provided. That interceptor ring is a conical wall about the outer pole ridge I3, presenting an upper sharp edge 35' substantially at the level of the feed rotor plate 2l.
- the interceptor cone is preferably secured at its lower edge upon the upper edge of a cylindrical median Wall 36 constituting a unitary part of the magnetic frame structure below the pole.
- Radi-al walls 31 connect the median wall to the inner and to the outer walls of the magnet structure and are integral therewith.
- the magnet thus presents a cellulal ⁇ structure at its lower part, with sector-shaped cells including an inner tier 38 within the wall 35 and an outer tier 33 "from adhering tothe wall of the equipment.
- skirt 33 of the pole shield rotor is pro- ⁇ vided with a series of unitary triangular vanes l40, the outer oblique edges 4I of which substantially run across the inside of the interceptor 35.
- the' feed rotor 25 is de'sirably provided with a' unitary dat flange 42 extending outward radially across the width of the lower pole ridges I6, I1 and I8 and across the interceptor cone 35 substantially to the outer wall of the magnet pole
- the flange 42 mounts at the lower face thereof ; a series of vanes 43 which have an upright outer wall moving along the bore of the magnet str-ucture and an inclined inner wall 44 moving along the outer face of the interceptor
- both the said vanes 4e .and 43 are in planes inclined to the vertical so that in the rotation of the respective parts the material will not.' only be loosened but urged downward 'into and through the respective cells 38 and 39.
- the feed rotor is desirably a hollow conical structure comprising the circular plate 2l and a fiat hollow cone 45 coaxial therewith and connected thereto by radial fins 46.
- the hollow'cone denes a narrow nozzle at the periphery 22 of plate 2l, and the flange 42 extends outward from the cone above said nozzle.
- Collector means is provided for the segregated vmagnetic and non-magnetic particles and con.
- annular drum 41 may be disposed directly under the ⁇ magnet structure and aixed thereto as at 48.
- This annular drum has a door 49, an inner wall 55, .and an outer wall I, the latter desirably flush with the magnet structure.
- a rotor comprising an upstanding annular median wall 52, said wall having an upstanding peripheral n 53 preferably telescoped into the correspondingly bifurcated lower edge of the magnet dividing wall 36.
- the rotor wall 52 is desirably provided with a plurality of blades 55 extending to the inner periphery of the drum vand blades 56 to the outer periphery thereof.
- Said inner blades are connected by bridge piece 51 to a shaft 58 mounted on ball bearings 59, 60 coaxial with shafts 23 and 29, and driven as by a pulley 6i.
- the floor of the drum has an outlet 62 at one side of the rotor wa11 ⁇ 52 for discharge of the magnetic particles therethrough and a similar outlet 63 at the other side of the annular wall 52 for discharge of the non-magnetic particles.
- the blades 55 and 56 are preferably inclined to the vertical, positively to push the collected m-aterial through the respective ports 62 and 63.
- the machine is desirably kept under a Vacuum applied by a suitable pump (not shown) as through a port 64 in the magnet wall.
- a suitable pump not shown
- Such vacuum operation is advisable where the grains of powder to be separated are smaller than 1GO microns.
- the housing illustratively comprises Ia casing 12 positioned over the feed 12 and a casing 62' enclosing the ports 62 and 63.
- a centrifugal disintegrator plate 65 is provided. This plate is of relatively small diameter and is co-planar with the feed rotor plate 2
- the disintegrator plate is desirably mounted on the upper end of an inner shaft 61 encircled by shaft 23, said inner shaft rotating in ball bearings 63 and 69 and being driven by suitable means, Ias by a pulley 10.
- the disintegrator plate 65 may, if desired, have narrow ribs 1I to facilitate operation.
- the hopper 12 from which the stock to be treated is introduced feeds through pipe 13 directly upon the disintegrator plate 65 which is driven at relatively high speed, effectively to disintegrate the lumped masses of particles.
- the stock drops by gravity upon the disintegrator plate 6 which is rotated at speed such as to cause any small lumps of iron and clay for instance, to become disintegrated as they are hurled outward toward the feed rotor 26.
- the feed rotor By the feed rotor, the stock thus previously disintegrated is hurled outward centrifugallyat high speed through the peripheral nozzle at 22 in an annular stream of small thickness across the annular air gap G.
- the magnetic flux to the innermost of the annular pole ridges I6 selectively deflects the magnetic particles downward somewhat, without in any wise however affecting the movement of the non-magnetic particles.
- the deected magnetic particles are further deflected downward, and thus the operation proceeds as the stream of particles iiows past the successive magnetic ridges (which would be of suitable number) until, by the time the final outer magnetic pole ridge I8 is passed, the deflection will be sufficient for the knife edge 35 of the interceptor ⁇ cone 35 to intercept the magnetic particles and allow the remaining particles to proceed therebeyond.
- f A shows the yapproximate trajectories. of kthe rnon'magne'tic particles (shownin .dot .and :'iflashllinesl and; off thelmagnetic particles. (shown lfini 'dottedl lines) ,lthe length 'of the magnetic gap 1*between the "poles Ibeing/greatly exaggerated.
- each of the bearingslis equipped ⁇ with a. suitable .oil ⁇ ,seal vof more orless lconventional construc- ⁇ ⁇ cannular:aire gap 1G is say 15 centimeters and the widthlofthegap might .be 1 centimeter, the feed -rotorllwouldaloepoperated ⁇ at azspeed of 25.00 ⁇ or fmoreRJP. M'.; .the pole .shield rotor 21 might be .operatedwataspeed :of 6000 R..P. M. .or more, andfthezdisintegrator rotor plate 65 ⁇ at .a speed of .30,00R. P.fM. or. more.
- .fhemachineiandimethod are not limited to :the separationrof-magnetic ,from other solid par- ..6 faration 1. of .magnetic fparticles r" from .arsstreami .of ⁇ igas entraining'ithef same las; ⁇ for instance; immediately following fthe .reduction :of ⁇ -iron ore. f In this case'v itfwill .tbe apparentithat thexna'gnetic .particles Vwill -be separated exactly sassabovedefscribed vand 'I the :great :bulkpf'the gas .will .pass ioutward .irom beyond the interceptor ..1cone1z35.
- interceptor ring V having anfannularupper-edge substantially -at .the level of vsaid feed rotoreand encompassing the lower pole piece, an annular f -Wall..mounting said interceptor ringior segregation i of the 1 non-magnetic particles ⁇ yat 'one1side 'thereof -and the magnetic at the other, -vanesin- ⁇ terposed between the interceptor ring andthe inner-and outer walls ofthe magnet structure,"and means 'frfrotating said vvaries tol forcer the Alsepa- .rated'f' particles fdownwardfor collection .thereof.
- V3..A./.rn'agnetic separator comprising van electromagnet structure, vhaving 'a cylindrical outer wall and a generally .cylindricalinner Wall' hav-ing a relatively flat upper annular 'pole piece/and a relatively sharp lower annularpolepiece deter'- lthelower p'ole, an upstanding cylindrical dividing wall within the electromagnet between theouter yand innerwallsof'the latter, and an interceptor cone supporting on top ⁇ of said dividinglwall-ianfc having an upperseparator edge nearsaid shield 'cap rotor and 'substantially' at the level 4ofthe-'feed rotor, inclined Ivanes interposed'between the in terceptor cone and the outer wall of the electromagnet, inclined vanes interposed i between the interceptor 'coneand the shield-cap rotor, ⁇ and meansfor revolving said'vanes about the axis' 'of the separator.
- a magnetic separator comprising an electromagnet structure having a cylindrical outer wall and a generally cylindrical inner wall, the latter having a relatively flat upper annular pole piece and a relatively sharp lower annular pole piece determining an annular air gap therebetween, afeed rotor encompassed by said air gap presenting an annular nozzle adjacent said air gap and at level slightly higher than the lower pole piece, said rotor including an annular flange extending outward from the upper edge of said nozzle to nearly the inner face of the outer Wall of the magnet structure, an interceptor ring about the air gap at substantially the level of the feed rotor, a series of inclined vanes rigid with the lower face of said flange and interposed between the interceptor ring and the outer wall of the casing, a non-magnetic shield cap rotor coaxial with said feed rotor and extending with small clearance along the lower pole piece and a series of inclined vanes affixed to the outer portion of said shield cap and rotating therewith alongthe inner wall of the interceptor ring.
- a magnetic separator comprising a generally cylindrical hollow electromagnet shell, having a continuous cylindrical outer wall and an interrupted interior wall presenting an upper pole piece, a lower pole piece of greater flux density and an annular air gap therebetween, means for introducing the stock axially of the separator, a feed rotor at level slightly higher than that of the lower pole piece, an interceptor ring having an upper edge at substantially the level of said rotor and intercepting magnetic particles subjected to both magnetic and centrifugal action, While passing non-magnetic particles subjected only to centrifugal action.
- a magnetic separator comprising an electromagnet casing structure having a cylindrical outer wall, annular pole pieces spaced inward therefrom with an annular air gap therebetween, the upper of said pole pieces being relatively flat and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet, one of said drive shafts having a feed rotor affixed thereon, said rotor presenting a horizontal plate extending at its periphery near and slightly above the lower pole piece and encompassed thereby, one of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under said feed rotor, and over and along the effective outer area of the lower pole piece.
- a magnetic separator comprising an electromagnet casing structure having a cylindrical outer wall, annular pole pieces spaced inward therefrom with an air gap therebetween, the upper of said pole pieces being relatively flat and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet casing, one of said drive shafts having a feed rotor affixed thereon, said rotor presenting a horizontal plate extending at its periphery near and slightly above the lower pole piece and encompassed thereby, a second of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under saidfeed rotor and capping the lower pole piece and extending along its effective outer area, and a third of said drive shafts having a rotor disk substantially at the level of and encompassed by the feed rotor, and a hopper introducing the stock to drop upon said disk.
- a magnetic separator comprising an electromagnet casing structure, having a cylindrical outer wall, annular pole pieces spaced inward therefrom with an air gap therebetween, the upper of said pole pieces being relatively fiat and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet, one of said drive shafts having a feed rotor affixed thereon, said rotor presenting a horizontal plate extending at its periphery near and slightly above the lower pole piece and encompassed thereby, a second of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under said feed rotor, capping the lower pole piece and extending along its effective outer area, generally annular separator cells between the inner and outer walls of the electromagnet and below the pole pieces thereof, said cells having a. cylindrical separator ⁇ wall concentric and between the inner and outer walls of the electromagnet, and an interceptor ring rising from the upper end of said separator Wall and having an upper edge at substantially the
- a magnetic separator comprising an electromagnet casing structure, having a cylindrical outer wall, annular pole pieces spaced inward therefrom with an air gap therebetween, the upper of said pole pieces being relatively fiat and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet, one of said drive shafts having a feed rotor affixed thereon, a second of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under said feed rotor, capping the lower pole piece and extending along its effective outer area, generally annular separator cells between the inner and outer walls of the electromagnet and below the pole pieces thereof, said cells having a cylindrical separator wall concentric rwith and between the inner and outer walls of the electromagnet, an interceptor ring rising from the upper end of said separator Wall, and having an upper edge at substantially the level of the shield cap, said feed rotor comprising a flat hollow conical structure presenting a thin peripheral nozzle, near and slightly above
- a magnetic separator comprising an electromagnet casing structure having a cylindrical outer wall, annular pole piecesv spaced inward therefrom with an air gap therebetween, the upper of said annular pole pieces being relatively at and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet, one of said drive shafts having a feed rotor affixed thereon, a second of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under said feed rotor, capping the lower pole piece and having a skirt over its outer face, separator cells in the electromagnet and below the pole pieces thereof. a cylindrical dividing wall.
- a magnetic separator comprising an elec- ⁇ .trornagnet structure, having a cylindrical outer wall, va generally cylindrical inner wall present- ,ng :an annular relativey dat upper pole piece and an annular 'relatively sharp lower pole piece, bothspaced from the topand bottom of the electromagnet structure, :the lower fpart 'of the electromagnet structure below the .lower pole piece presenting radiating ribs ,and a media-n annular .wall,-dening segment yshaped cells, a ycollector drum directly under the electromagnet structure, an annular separator wall in said drum -diirectly below ,the median annular wall, dening :annular ,collector receptacles, and discharge ports .from opposite :sides of the annular sepa- .sta'ntally the level thereof,.for .directing .the magnetic particles toward the .inlet side thereof through the inner magnet cells to the corresponding innercollector
- an electromagnet structure consisting of two annular pieces each generally U-shaped in radial cross-section and secured in abutting relation at their outer rims, the inner annular edges of the structure being spaced and defining poles, the upper of which is relatively flat and the lower relatively sharp, the lower of said electromagnet pieces having longitudinal cells therethrough below the pole piece, said cells comprising an inner tier and an outer tier, a cylindrical separator wall of the magnetic structure between said tiers, and an interceptor wall rising from said separator wall and presenting an upper edge encompassing and slightly above the lower pole.
- a magnetic separator comprising an electromagnet structure consisting of two annular pieces, each generally U-shaped in radial crosssection and secured in abutting relation at their outer rims, the inner annular edges of the structure being spaced and dening pole pieces, the upper of which is relatively flat and the lower relatively sharp, the lower of said electromagnet pieces having longitudinal cells therethrough below the pole piece, said cells comprising an 1'0 inner tier and an outer tier, a cylindrical dividing wall of the magnetic structure between said tiers, a conical interceptor well rising from said dividing wall and presenting an upper ledge encompassing and slightly above the lower pole piece, ymeans ⁇ for introducing the stock axially downward through the annular electromagnet structure, a plurality of rotors for treating Asaid stock at substantially the level of the air gap, up-right shafts coaxially through the structures for driving said rotors, said rotors including a feed rotor with its periphery near the air gap and. slightly above .the lower pole,
- a magnetic separator comprising an electromagnet structure, said .structure .consisting ⁇ of two annular elements each generally U-shaped in .radial cross section and secured in abutting relation at their outer rims, the inner ⁇ annular edges of the .respective elements defining ⁇ spaced pole pieces, :the upper of which is relatively lilat and the lower relatively sharp, the lower of said elements havinCr longitudinal cells therethrough below the pole piece thereof, said cells comprising an inner tier andan outer tier, a cylindrical dividing ⁇ wall of the magnetic structure between ,said tiers, an interceptor cone rising from said wall and presenting an upper edge Aencompassing and slightly above the lower pole piece, means introducing the rstock axially downward through the annular lelectromagnet structure, ,a
- rotors for treating ⁇ said stock subsstantially ⁇ at the level of the air gap, upright shafts extending coaxially through the annular magnetic structure ,for driving ysaid rotors, said rotors including a feed rotor with its periphery near the air gap and -rslightly above the .lower pole, a shielding pole cap rotor over the lower pole piece, a collector drum vcoaxial with and ,im-
- said vdrum having an annular rotor therein, comprising a median wall extending the height of the drum and telescoped with respect to the lower edge of the dividing wall of the magnet, said median wall having vanes rigid therewith extending'to the opposite faces ofthe drum, drivemeans coaxial with the rotor drives for slowly driving said annular rotor within its drum, said ⁇ drum having ports in its iloor at .opposite sides of the median wall of the rotor therein for discharge of the segregated magnetic and non-magnetic material therefrom.
- a magnetic separator comprising an electromagnet structure consisting of two annular elements, each generally U-shaped in radial cross-section and secured in abutting relation at their outer rims, the inner annular edges of the respective annular elements defining spaced pole pieces, the upper of which is relatively flat and the lower relatively sharp, and defining an air gap therebetween, the lower of said elements having longitudinal cells therethrough below the pole pieces, said cells comprising an inner tier and an cuter tier, a cylindrical dividing wall of the magnetic structure separating said tiers, an interceptor cone rising from said dividing wall and presenting an upper edge encompassing and slightly above the lower pole piece, means for introducing the stock axially downward through the annular electromagnet structure, a plurality of rotors for treating said stock substantially at the level of the air gap, concentric upright shafts axially through the magnet for driving the several rotors, said rotors including a feed rotor with e its periphery near the air gap and slightly above the lower pole, a
- a magnetic separator comprising an elecftromagnet structure having coacting annular elements each U-shaped in radial cross-section,
- the lower magnet structure below the pole piece thereof being longitudinally cellular and including two tiers of cells having radiating walls and having a cylindrical dividing wall, an interceptor cone rising from said dividing wall and having an upper edge encompassing and slightly above the lower pole piece, means for introducing the stock axially and longitudinally through the magnet structure, and a series of rotors for handling the material, said rotors comprising a feed rotor and la shielding cap rotor, concentric shafts driving the respective rotors, the feed rotor hurling the stock peripherally outward and the shielding cap rotor precluding adhesion of the magnetic material to the pole, and a drum coaxially of the structure disposed directly under the magnet, having a rotor therein, presenting an annular wall registering with the dividing walls, vanes rigid with said annular wall and adjacent
- a magnetic separator comprising a pair of annular magnet elements each U-shaped in radial cross-section determining a cylindrical outer wall and spaced annular pole pieces at its inner wall, defining an air gap therebetween, an interceptor ring about said air gap, the upper of said pole pieces being relatively flat and the lower of said pole pieces comprising a plurality of spaced concentric relatively sharp annular ridges, a feed rotor encompassed by said lower pole piece and presenting a rim adjacent the inner of said annular pole ridges and slightly above the level thereof, and a non-magnetic pole shield rotor coaxial with said feed rotor and extending across the width of said lower annular pole piece and the several annular ridges thereof.
- the feed rotor comprises a hollow wide based cone, presenting a thin annular nozzle about the base thereof and in which said cone has a unitary flat flange extending outward substantially to the wall of the electromagnet structure, and in which the base of the electromagnet -has a cellular structure including a cylindrical REFERENCES CITED
- the feed rotor comprises a hollow wide based cone, presenting a thin annular nozzle about the base thereof and in which said cone has a unitary flat flange extending outward substantially to the wall of the electromagnet structure, and in which the base of the electromagnet -has a cellular structure including a cylindrical REFERENCES CITED
Description
R. PLANIQL MAGNETIC sEPARAToR Jan. 15, 1952 2 SHEETS-SHEET l Filed sept. 21, 1945 INVENTOR Rene Plafu0 ATTORNEYS Jan. 15, 1952 R, PLANlQL 2,582,274
MAGNETIC SEPARATOR Filed sept. 21, 1945 2 SHEETS-SHEET 2 lNvENToR Ren Planz'oZ ATTORNEYS Y Patented Jan. 15, 1952 MAGNETIC SEPARALTOR RenLPlanioL.NewfYork, N..Y.,-assignor vtc Pluro, .Inc.,.New'Xork,IN. Y., .a corporation of New ork ApplicationSeptember 21, 1945,Serial Noam-7,711
'.i23lClaims. '1 The present inventionrelates vtotthe `vart of .magnetic separation,4 that .is .of lseparating mag- .'neticfromenonemagnetic .particles of. negranu- --lar. lorpowdered. ore.` or otherfcomminuted stock.
It-,rsfamong:thefobjects of theinventionV tovlpro- `ride-.1a.method andI compact apparatus forconk.timiously performingsuch vmethod,:-expeditiously fand-.zeiectively .to segregate .the magnetic from thetnonamagneticparticles of-icomminutedesuch Las ,1 powdered oreor other` istock,weven lthough .of Sticky or tackycharacterffwithout the likelihood -of;jamln.r.1gf;or clogging, 1. or the' need forginterfruptingf. the Dperationto .clear-.the mechanism.
In fthe. accompanying drawings :in v-vvliicii Vare shown-one or morelfof various possibla embodi- .ments .fof the V,several e features f of `.the invention, Eig t 1 is a view in 1 longitudinal lcross-jsection srshowingithe right half l onlyfof. one embodiment of the equpment fWith partsv .broken away,
Fig. .1a.fis ra rfragmentary detailed-fviewf show- ...ing .the-airtight housing,
Fg..2 isfa transverse fcrosssectional.view-taken `:.onwlf e: 2-.2-;of. Fig.;.1.
v Eig..;;.3-f is'a .transverse-cross sectional view. taken on line 3-3 of Fig. 1,
vFig. ,4 .isY a. transverse vcrossfsectional:viewtaken l -ongline 4-4 of Figlyl,
.z-Figgfis-:a fragmentary.sectional'fview indicating the approximate .magnetic .ilux "and '.the ...trajectory vfof .the lmagnetic -and .of z therznonemag- .gnetic 1; particles :in the .traverse :thereof p through the machine A:the length fof the air; gap -`being .-.greatlyy exaggerated :and the :freed wrotor .-being omitted for:clarity-:of disclosure, :and
. fFigr vis ja -ragmentaryzsectional views:similar ltingat therouter rimsand spacedlattheir. inner rims. to Henne.. an.. air gap..Gtherebetween.
Thetwoelements .of the .magnet .eldistructure the upper .ofwhichhouses ,the co'il ..C, are Mdesir- .ablysecuredtogether .bymoreor less Couven-45 ftionall'ange piecesA l2. and. i3.about.their respec- "tverims, which are'bolted Atogetheras at4 l4`.to
maintain an interposed gasket g Aunder comilpression.
1 ".The magnethas .annipper .annular .pole ll5v,l
trianglewith a relatively rounded apex. "The an- .l airgap.,are.drawn downward. The magneticflux is distributed substantially.asindicatediinthe lfragmentary.view of Eig.5,.to determine.,a1 .plu .rality of .spaced concentric annular magnetic `iields rising from the .respective .annular t.pole
.l5 -ridgesl l. 6,..l.'l, .(8. .The electromagnet isdesirably 4.constructed .to aiorda `flux vthrough the. .gap G oi"..'the..maxirm1m. practicalintensitwi. e.. o`f. about u10,060 Gauss.
.According .to the invention,.thestocktobe .separatedishurled .outwardlby ,centrifngal force radially across 'thear` gap() of the magnet. "To `this. end, a. feed rotor 29.',is provided, which `comr.prisesa horizontal,.plate'. ZILhaVing ra rim' 22 near Vthe..inneranniilar magneticpole ridge .[6 vand whichis at alevel.slightlyabove.the.apex ofsaid ridge. and-welll.belowtheupper pole l5. The rotor Y is .desirabiy .mounte'don the upper v,end of anvupright' hollow `.driving vshaft 23 extending .axially vthrough the ..magnet structure, lodged "hall 0 lbearings 24 and '25, and A.driven @from a.. suitable u `source .of power (not shown), .as .'for instance ,througha'pulley .26 aboutthe' lowerlend.. ofithe said shaftv23.
A upole. Shield `.lil v.guards ',Ithe lower `pole ,piece `from directengagement by the magnetic particles. "The pole vshield. isa ring'desirablybt not vnecessarily `of .non-magnetic materiaLv-preferably.. metal .aliixed .at its hub .2.8 .to .the end `ola hollowshaft' 29m/nich desirably encloseslthe shaft 40 .23 .previously ...described turns'in ballbearings 30.' 3 I, .andis driven by asuitablelsource, of .power (not shown), as.`for instance v'throughpulley'ld on .its lower end. Ifhe .pole shield .extends 4'ololidnely upwar'difrom itsliub past'the ,beveled edge] I..offfe ed rotorl20 .and has Ja .thin .horizontal annular web32eXten'ding vover aridlbridg- '.ingbetWeen fthe annlarpole ridgeS'l6,. |1,.1l8 of the' .lowerpole said shieldihaving a."s`kirt.`33 ex- .tending over .fthe outeriace of the -,outergpole .ridgell8. The ridgebridging Web.32 of thepole shield" 21'. is preferably.substantially. inthe plane .of they feed rotorplate'Z'l.
To .sggrcgate'the magneticparticles d'eiiected 4bythe'action vof the, pole .ridgesfi 1.1,. I8 Irom the nonemagneticparticles.hurled outwardibythe structure.
cone.
feed rotor without such magnetic deflection, an interceptor ring 35 is provided. That interceptor ring is a conical wall about the outer pole ridge I3, presenting an upper sharp edge 35' substantially at the level of the feed rotor plate 2l.
The interceptor cone is preferably secured at its lower edge upon the upper edge of a cylindrical median Wall 36 constituting a unitary part of the magnetic frame structure below the pole. Radi-al walls 31 connect the median wall to the inner and to the outer walls of the magnet structure and are integral therewith. The magnet thus presents a cellulal` structure at its lower part, with sector-shaped cells including an inner tier 38 within the wall 35 and an outer tier 33 "from adhering tothe wall of the equipment. To this end, skirt 33 of the pole shield rotor is pro- `vided with a series of unitary triangular vanes l40, the outer oblique edges 4I of which substantially run across the inside of the interceptor 35. Likewise the' feed rotor 25 is de'sirably provided with a' unitary dat flange 42 extending outward radially across the width of the lower pole ridges I6, I1 and I8 and across the interceptor cone 35 substantially to the outer wall of the magnet pole The flange 42 mounts at the lower face thereof ;a series of vanes 43 which have an upright outer wall moving along the bore of the magnet str-ucture and an inclined inner wall 44 moving along the outer face of the interceptor Desirably both the said vanes 4e .and 43 are in planes inclined to the vertical so that in the rotation of the respective parts the material will not.' only be loosened but urged downward 'into and through the respective cells 38 and 39.
The feed rotor is desirably a hollow conical structure comprising the circular plate 2l and a fiat hollow cone 45 coaxial therewith and connected thereto by radial fins 46. The hollow'cone denes a narrow nozzle at the periphery 22 of plate 2l, and the flange 42 extends outward from the cone above said nozzle.
Collector means is provided for the segregated vmagnetic and non-magnetic particles and con.
venient means for withdrawing the same from the machine, To this end an annular drum 41 may be disposed directly under the` magnet structure and aixed thereto as at 48.
This annular drum has a door 49, an inner wall 55, .and an outer wall I, the latter desirably flush with the magnet structure. In the drum there is .desirably mounted a rotor comprising an upstanding annular median wall 52, said wall having an upstanding peripheral n 53 preferably telescoped into the correspondingly bifurcated lower edge of the magnet dividing wall 36. The rotor wall 52 is desirably provided with a plurality of blades 55 extending to the inner periphery of the drum vand blades 56 to the outer periphery thereof.
Said inner blades are connected by bridge piece 51 to a shaft 58 mounted on ball bearings 59, 60 coaxial with shafts 23 and 29, and driven as by a pulley 6i. The floor of the drum has an outlet 62 at one side of the rotor wa11` 52 for discharge of the magnetic particles therethrough and a similar outlet 63 at the other side of the annular wall 52 for discharge of the non-magnetic particles. The blades 55 and 56 are preferably inclined to the vertical, positively to push the collected m-aterial through the respective ports 62 and 63.
To avoid interfering with the eicacy of separation at the pole piece by the effect of the turbulence of air at that region, the machine is desirably kept under a Vacuum applied by a suitable pump (not shown) as through a port 64 in the magnet wall. Such vacuum operation is advisable where the grains of powder to be separated are smaller than 1GO microns.
Although any suitable outer air tight housing could be used to contain the unit in order that a vacuum may be maintained, in the embodiment herein shown the housing illustratively comprises Ia casing 12 positioned over the feed 12 and a casing 62' enclosing the ports 62 and 63.
Since the stock is frequently relatively adhesive in character, the introduction of an air blast for disintegrating such stock would not ordinarily be practical where, as preferred, it is desired to operate the machine under vacuum. Therefore, the p-resent invention affords a means for effecting such separation without the introduction of air or gas. To this end, desirably a centrifugal disintegrator plate 65 is provided. This plate is of relatively small diameter and is co-planar with the feed rotor plate 2|, it being desirably countersunk within a central opening 66 in the plate 2l. The disintegrator plate is desirably mounted on the upper end of an inner shaft 61 encircled by shaft 23, said inner shaft rotating in ball bearings 63 and 69 and being driven by suitable means, Ias by a pulley 10. The disintegrator plate 65 may, if desired, have narrow ribs 1I to facilitate operation. The hopper 12 from which the stock to be treated is introduced, feeds through pipe 13 directly upon the disintegrator plate 65 which is driven at relatively high speed, effectively to disintegrate the lumped masses of particles.
For clarity, the method of the present invention and the mode of operation of the illustrative equipment for carrying such method into execution will now be described.
The stock drops by gravity upon the disintegrator plate 6 which is rotated at speed such as to cause any small lumps of iron and clay for instance, to become disintegrated as they are hurled outward toward the feed rotor 26. By the feed rotor, the stock thus previously disintegrated is hurled outward centrifugallyat high speed through the peripheral nozzle at 22 in an annular stream of small thickness across the annular air gap G. Iny this movement, as will be apparent, the magnetic flux to the innermost of the annular pole ridges I6 selectively deflects the magnetic particles downward somewhat, without in any wise however affecting the movement of the non-magnetic particles. As the stream is hurled past the second magnetic pole ridge I1, the deected magnetic particles are further deflected downward, and thus the operation proceeds as the stream of particles iiows past the successive magnetic ridges (which would be of suitable number) until, by the time the final outer magnetic pole ridge I8 is passed, the deflection will be sufficient for the knife edge 35 of the interceptor` cone 35 to intercept the magnetic particles and allow the remaining particles to proceed therebeyond.
v7'1I/'he non-magnetic polelshield rotorv 2 'l' prevents vfthe' )magnetic particlesi-fromf-adhering lto-ithe. pole ridges lv6, il'l, i138. It V`is f-driven at 'rsuch speed ft-hat it.' imparts -suiiicsient 1 centrifugal :force ".to eany @articles `-in -fcontact l therewith y'to hurl the "same "outward 'along skirt 33 -for release at f the lower part of such skirt, where there is substan- "tially'fnozfmagneticeld.
Theirnachineoperatesllsufliciently vwith ail-righ foutput, `since the1-succession of annular :magnet 10 polef-'ridgesrmakes possible a -sucient deflection vStiff-the'frna'g-neticparticles 'in their traverse across "the radius-of the-fairvgap,'feven1.though the feed frotorf is irevolve'df `atthelltremendous speed neces- `-lsary ifor ra "large output with :consequent .high centrifugal lforce.
f Ashows the yapproximate trajectories. of kthe rnon'magne'tic particles (shownin .dot .and :'iflashllinesl and; off thelmagnetic particles. (shown lfini 'dottedl lines) ,lthe length 'of the magnetic gap 1*between the "poles Ibeing/greatly exaggerated.
"iThus ``the magnetic particles Areleased 'from vnear-the lower edgeof skirt33 will drop into fthe innerftiervof cells 386m the magnetstructure vwhile the non=magnetic .particles that had not been "deected .downward will drop into the outer tierof cells39, the vanes 40 onthe skirt `of Ethepoleishield .2lfand .the vanes '43 Von rthe .tllange "42 of the i feed :rotor :assisting the downl'wardifmovement: of'ithe :segregated particles Vand precluding adhesion thereof to `the respective wall flstructures. The separated particles pass fdownwardintothe.drum 4l and the annular .'oollectorstherein latv opposite sides of there-tor :.ringi52. In theislowpropulsion of the collector =:rotorf.l52 from .thelpulley 6|, Vthe collected `imafterialhisi'sweptoutofthe machine into suitable receptacles (notfshownLthe magnetic particles through Sport 62 and the non-magneticthrough f-fpo'rtfSB.
:It #will of course .be understood that equipnnentwithas manyor asifewrof the concentric `magnetpole'ridges. I6, I'l, I8, as desired, may be employed. In.:Fig. .6 Ais `shown illustratively a ilfragmentfof :equipment like that .of Fig. l, ex- .lcept :that y:the flower :pole .piece lhas but 'fa 'single annular ridge S lr6. v.'I'he'imachine would have a lcori'espondingly lower-output, .since the centrif- .=..'uga1.:force..applied to .the .'stock' must. not be so high @that .the .single pole ridge would Lfail Ito telectfsufdcient deiiection for `reliable :segrega- Vtionzlof Jthe: magnetic .particles sAsipreviously'indicated, the vacuum .operation isapreferredVsincezthis avoids the entrainment -ofxnona-magnetic .with magneticparticles due to ieddycurrents oflair` neartheair gap under the sspeed of .centrifugal propulsion. 'Where .such '.-vacuumsisxapiilied,` it will vbe understood that each of the bearingslis equipped `with a. suitable .oil `,seal vof more orless lconventional construc-` `cannular:aire gap 1G is say 15 centimeters and the widthlofthegap might .be 1 centimeter, the feed -rotorllwouldaloepoperated` at azspeed of 25.00 `or fmoreRJP. M'.; .the pole .shield rotor 21 might be .operatedwataspeed :of 6000 R..P. M. .or more, andfthezdisintegrator rotor plate 65`at .a speed of .30,00R. P.fM. or. more.
.fhemachineiandimethodare not limited to :the separationrof-magnetic ,from other solid par- ..6 faration 1. of .magnetic fparticles r" from .arsstreami .of `igas entraining'ithef same las;` for instance; immediately following fthe .reduction :of `-iron ore. f In this case'v itfwill .tbe apparentithat thexna'gnetic .particles Vwill -be separated exactly sassabovedefscribed vand 'I the :great :bulkpf'the gas .will .pass ioutward .irom beyond the interceptor ..1cone1z35. izIf 11 the gas. `is .propelledrunder isuitab'leipressure, -the feed rotorr20 could rbe left .stationary .inlsuch :operationgas will-.be Vimmediately apparent.-
,'Asfmany-changes .could .be .made finlthela-bove Dmethod. :and construction, and .manyfapparently fwidelyy different 'embodiments `:of i'this :invention :conldrbezmadewithout departing fromtheiscope :ofthe claims, it is intended thatallamatterfconltained. inztheabove description orfshown'lin the :accompanying drawings, .L shall be interpretedi'as .illustrative:andrnotv inza limitingfsense.
Having thus described myinventiongfwhatll clairn'Y as 1 new and :desire nto .secure by Letters -Patent 'of the United States` is i l. Af'fma'gnetic separator, vcomprisingfan:elec- .tromagnet havinganannular. air :gape'with allow- -er pole ofihigher luxdensityfand an upperV pole-,of lowerrflux. density, va feed rotor. encompassed 'lby said poles andat levelslightly higher than that of .the lower pole, non-magneticrotarvshield plate .over saidv lower pole, .and 2. an interceptor ringv 'encompassingisaidlower' pole land .havingian upper edgezfsubstantially at theleveleof :said votary;shield plate, .and Acollectors below -saidfin- '.terceptorl ring andi 'at' `opposite-sides thereof; respectively, for Athe magnetic and the nonernagnetic components.
2. 'A magnetic separator, coniprisingan electromagnet having fa cylindrical outer fwall an inner v*wall with an .upper relatively iiat'annular pole and la ylower relatively .sharp 'annularpole -With .an annular :air gap therebetween, a feed rotor encompassed bysaid-airfgap'and at "level lslightly higher than that of"-the'flower1pole,=an
interceptor ring Vhaving anfannularupper-edge substantially -at .the level of vsaid feed rotoreand encompassing the lower pole piece, an annular f -Wall..mounting said interceptor ringior segregation i of the 1 non-magnetic particles `yat 'one1side 'thereof -and the magnetic at the other, -vanesin- `terposed between the interceptor ring andthe inner-and outer walls ofthe magnet structure,"and means 'frfrotating said vvaries tol forcer the Alsepa- .rated'f' particles fdownwardfor collection .thereof.
V3..A./.rn'agnetic separator, comprising van electromagnet structure, vhaving 'a cylindrical outer wall and a generally .cylindricalinner Wall' hav-ing a relatively flat upper annular 'pole piece/and a relatively sharp lower annularpolepiece deter'- lthelower p'ole, an upstanding cylindrical dividing wall within the electromagnet between theouter yand innerwallsof'the latter, and an interceptor cone supporting on top` of said dividinglwall-ianfc having an upperseparator edge nearsaid shield 'cap rotor and 'substantially' at the level 4ofthe-'feed rotor, inclined Ivanes interposed'between the in terceptor cone and the outer wall of the electromagnet, inclined vanes interposed i between the interceptor 'coneand the shield-cap rotor, `and meansfor revolving said'vanes about the axis' 'of the separator.
4. The combination recited in claim 3, ina-'nich `thevanes at the outerside ofthe interceptor cone fzticles'ibut'may bensed `to nadvantagefforthe. sepr"l are 'rigidfwith thel feedf rotor.
5. The combination recited in claim 3, in which the vanes at the inner side of the interceptor cone are rigid with the shield cap rotor.
6. A magnetic separator, comprising an electromagnet structure having a cylindrical outer wall and a generally cylindrical inner wall, the latter having a relatively flat upper annular pole piece and a relatively sharp lower annular pole piece determining an annular air gap therebetween, afeed rotor encompassed by said air gap presenting an annular nozzle adjacent said air gap and at level slightly higher than the lower pole piece, said rotor including an annular flange extending outward from the upper edge of said nozzle to nearly the inner face of the outer Wall of the magnet structure, an interceptor ring about the air gap at substantially the level of the feed rotor, a series of inclined vanes rigid with the lower face of said flange and interposed between the interceptor ring and the outer wall of the casing, a non-magnetic shield cap rotor coaxial with said feed rotor and extending with small clearance along the lower pole piece and a series of inclined vanes affixed to the outer portion of said shield cap and rotating therewith alongthe inner wall of the interceptor ring.
7. A magnetic separator, comprising a generally cylindrical hollow electromagnet shell, having a continuous cylindrical outer wall and an interrupted interior wall presenting an upper pole piece, a lower pole piece of greater flux density and an annular air gap therebetween, means for introducing the stock axially of the separator, a feed rotor at level slightly higher than that of the lower pole piece, an interceptor ring having an upper edge at substantially the level of said rotor and intercepting magnetic particles subjected to both magnetic and centrifugal action, While passing non-magnetic particles subjected only to centrifugal action.
8. A magnetic separator of the type claimed in claim 7, encased under vacuum, and means for breaking the adhesion between particles preliminary to the separator action, said means comprising a small rotor plate encompassed by the feed rotor and at substantially the level thereof.
9. A magnetic separator, comprising an electromagnet casing structure having a cylindrical outer wall, annular pole pieces spaced inward therefrom with an annular air gap therebetween, the upper of said pole pieces being relatively flat and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet, one of said drive shafts having a feed rotor affixed thereon, said rotor presenting a horizontal plate extending at its periphery near and slightly above the lower pole piece and encompassed thereby, one of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under said feed rotor, and over and along the effective outer area of the lower pole piece.
10. A magnetic separator, comprising an electromagnet casing structure having a cylindrical outer wall, annular pole pieces spaced inward therefrom with an air gap therebetween, the upper of said pole pieces being relatively flat and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet casing, one of said drive shafts having a feed rotor affixed thereon, said rotor presenting a horizontal plate extending at its periphery near and slightly above the lower pole piece and encompassed thereby, a second of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under saidfeed rotor and capping the lower pole piece and extending along its effective outer area, and a third of said drive shafts having a rotor disk substantially at the level of and encompassed by the feed rotor, and a hopper introducing the stock to drop upon said disk.
l1. A magnetic separator, comprising an electromagnet casing structure, having a cylindrical outer wall, annular pole pieces spaced inward therefrom with an air gap therebetween, the upper of said pole pieces being relatively fiat and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet, one of said drive shafts having a feed rotor affixed thereon, said rotor presenting a horizontal plate extending at its periphery near and slightly above the lower pole piece and encompassed thereby, a second of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under said feed rotor, capping the lower pole piece and extending along its effective outer area, generally annular separator cells between the inner and outer walls of the electromagnet and below the pole pieces thereof, said cells having a. cylindrical separator `wall concentric and between the inner and outer walls of the electromagnet, and an interceptor ring rising from the upper end of said separator Wall and having an upper edge at substantially the level of the shield cap.
l2. A magnetic separator, comprising an electromagnet casing structure, having a cylindrical outer wall, annular pole pieces spaced inward therefrom with an air gap therebetween, the upper of said pole pieces being relatively fiat and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet, one of said drive shafts having a feed rotor affixed thereon, a second of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under said feed rotor, capping the lower pole piece and extending along its effective outer area, generally annular separator cells between the inner and outer walls of the electromagnet and below the pole pieces thereof, said cells having a cylindrical separator wall concentric rwith and between the inner and outer walls of the electromagnet, an interceptor ring rising from the upper end of said separator Wall, and having an upper edge at substantially the level of the shield cap, said feed rotor comprising a flat hollow conical structure presenting a thin peripheral nozzle, near and slightly above the lower pole piece, said conical structure having a fiat fiange above the nozzle extending over the lower pole piece and its cap shield, over the interceptor ring and substantially to the outer wall of the electrcmagnet casing.
13. A magnetic separator, comprising an electromagnet casing structure having a cylindrical outer wall, annular pole piecesv spaced inward therefrom with an air gap therebetween, the upper of said annular pole pieces being relatively at and the lower relatively sharp, a plurality of upright coaxial drive shafts encompassed by the electromagnet, one of said drive shafts having a feed rotor affixed thereon, a second of said drive shafts having a non-magnetic shield cap rotor thereon extending in part under said feed rotor, capping the lower pole piece and having a skirt over its outer face, separator cells in the electromagnet and below the pole pieces thereof. a cylindrical dividing wall. through said cells concentric with and between the inner and outer having :an upper` edge -at substantially the level of -theyshield cap, -said ,feed `rotor compri-sing a ffiat, hollow conical structure determining a thin peripheral nozzle -encmpassed by the air gap, Asaid conica-l structure having a 1l-at outstanding iiange above the nozfzle extending 'over the lower pole piece, its -cap shield and the interceptor ring and f'substantially .to kthe -outer wall of Athe electromagnet casing, and inclined vanes respec- .Atively on ythe skirt of the shieldcap rotor and'on the underwall of the outstanding flange, said vanes respectively clearing the inner wall `of the interceptor ring and the inner surface of Athe 4outer wall `of theelectromagn'et. y
.14. A magnetic separator, comprising an elec- `.trornagnet structure, having a cylindrical outer wall, va generally cylindrical inner wall present- ,ng :an annular relativey dat upper pole piece and an annular 'relatively sharp lower pole piece, bothspaced from the topand bottom of the electromagnet structure, :the lower fpart 'of the electromagnet structure below the .lower pole piece presenting radiating ribs ,and a media-n annular .wall,-dening segment yshaped cells, a ycollector drum directly under the electromagnet structure, an annular separator wall in said drum -diirectly below ,the median annular wall, dening :annular ,collector receptacles, and discharge ports .from opposite :sides of the annular sepa- .sta'ntally the level thereof,.for .directing .the magnetic particles toward the .inlet side thereof through the inner magnet cells to the corresponding innercollector receptacle and for hurling ythe non-magnetic particles through the outer :cells to the corresponding outercollector receptacle.
15. vThe combination recited in claim 14, in which the-annular separator wall is rotatably mounted, in which drive means constantly revolves the samefand in which vanes unitary with and -at 'opposite sides of ,said :separator wall are rotated therewith and break adhesion lof the particles with the respective walls, the discharge ports being in the bottom of the drum.
16. In a magnetic separator, an electromagnet structure, consisting of two annular pieces each generally U-shaped in radial cross-section and secured in abutting relation at their outer rims, the inner annular edges of the structure being spaced and defining poles, the upper of which is relatively flat and the lower relatively sharp, the lower of said electromagnet pieces having longitudinal cells therethrough below the pole piece, said cells comprising an inner tier and an outer tier, a cylindrical separator wall of the magnetic structure between said tiers, and an interceptor wall rising from said separator wall and presenting an upper edge encompassing and slightly above the lower pole.
17. A magnetic separator comprising an electromagnet structure consisting of two annular pieces, each generally U-shaped in radial crosssection and secured in abutting relation at their outer rims, the inner annular edges of the structure being spaced and dening pole pieces, the upper of which is relatively flat and the lower relatively sharp, the lower of said electromagnet pieces having longitudinal cells therethrough below the pole piece, said cells comprising an 1'0 inner tier and an outer tier, a cylindrical dividing wall of the magnetic structure between said tiers, a conical interceptor well rising from said dividing wall and presenting an upper ledge encompassing and slightly above the lower pole piece, ymeans `for introducing the stock axially downward through the annular electromagnet structure, a plurality of rotors for treating Asaid stock at substantially the level of the air gap, up-right shafts coaxially through the structures for driving said rotors, said rotors including a feed rotor with its periphery near the air gap and. slightly above .the lower pole, and avshield cap rotor over the lower pole piece.
18. A magnetic separator comprising an electromagnet structure, said .structure .consisting `of two annular elements each generally U-shaped in .radial cross section and secured in abutting relation at their outer rims, the inner `annular edges of the .respective elements defining `spaced pole pieces, :the upper of which is relatively lilat and the lower relatively sharp, the lower of said elements havinCr longitudinal cells therethrough below the pole piece thereof, said cells comprising an inner tier andan outer tier, a cylindrical dividing `wall of the magnetic structure between ,said tiers, an interceptor cone rising from said wall and presenting an upper edge Aencompassing and slightly above the lower pole piece, means introducing the rstock axially downward through the annular lelectromagnet structure, ,a
plurality of rotors for treating `said stock subsstantially `at the level of the air gap, upright shafts extending coaxially through the annular magnetic structure ,for driving ysaid rotors, said rotors including a feed rotor with its periphery near the air gap and -rslightly above the .lower pole, a shielding pole cap rotor over the lower pole piece, a collector drum vcoaxial with and ,im-
kmediately below the electromagnet structure, said vdrum having an annular rotor therein, comprising a median wall extending the height of the drum and telescoped with respect to the lower edge of the dividing wall of the magnet, said median wall having vanes rigid therewith extending'to the opposite faces ofthe drum, drivemeans coaxial with the rotor drives for slowly driving said annular rotor within its drum, said `drum having ports in its iloor at .opposite sides of the median wall of the rotor therein for discharge of the segregated magnetic and non-magnetic material therefrom.
19. A magnetic separator, comprising an electromagnet structure consisting of two annular elements, each generally U-shaped in radial cross-section and secured in abutting relation at their outer rims, the inner annular edges of the respective annular elements defining spaced pole pieces, the upper of which is relatively flat and the lower relatively sharp, and defining an air gap therebetween, the lower of said elements having longitudinal cells therethrough below the pole pieces, said cells comprising an inner tier and an cuter tier, a cylindrical dividing wall of the magnetic structure separating said tiers, an interceptor cone rising from said dividing wall and presenting an upper edge encompassing and slightly above the lower pole piece, means for introducing the stock axially downward through the annular electromagnet structure, a plurality of rotors for treating said stock substantially at the level of the air gap, concentric upright shafts axially through the magnet for driving the several rotors, said rotors including a feed rotor with e its periphery near the air gap and slightly above the lower pole, a shielding pole cap rotor over the lower pole piece, a nat rotor plate substantially in the plane of and encompassed by the inner periphery of the feed rotor, an'annuiar collector drum coaxial with and immediately below the magnet, said drum having an annular rotor therein with a median wall extending the height of the drum and telescoped with respect to the lower edge of the dividing wall of the magnet, said annular rotor having vanes rigid therewith extending to the opposite faces of the drum, drive means coaxial of the rotor drives for slowly driving said annular rotor within its drum, said drum having outlet ports in its floor at opposite sides of the median wall for discharge of the segregated magnetic and non-magnetic material therefrom.
20. A magnetic separator, comprising an elecftromagnet structure having coacting annular elements each U-shaped in radial cross-section,
abutting at their outer rims and presenting spaced annular pole pieces at their inner periphery including a relatively at upper pole piece and a relatively sharp lower pole piece, the lower magnet structure below the pole piece thereof being longitudinally cellular and including two tiers of cells having radiating walls and having a cylindrical dividing wall, an interceptor cone rising from said dividing wall and having an upper edge encompassing and slightly above the lower pole piece, means for introducing the stock axially and longitudinally through the magnet structure, and a series of rotors for handling the material, said rotors comprising a feed rotor and la shielding cap rotor, concentric shafts driving the respective rotors, the feed rotor hurling the stock peripherally outward and the shielding cap rotor precluding adhesion of the magnetic material to the pole, and a drum coaxially of the structure disposed directly under the magnet, having a rotor therein, presenting an annular wall registering with the dividing walls, vanes rigid with said annular wall and adjacent the reand non-magnetic material.
21. A magnetic separator comprising a pair of annular magnet elements each U-shaped in radial cross-section determining a cylindrical outer wall and spaced annular pole pieces at its inner wall, defining an air gap therebetween, an interceptor ring about said air gap, the upper of said pole pieces being relatively flat and the lower of said pole pieces comprising a plurality of spaced concentric relatively sharp annular ridges, a feed rotor encompassed by said lower pole piece and presenting a rim adjacent the inner of said annular pole ridges and slightly above the level thereof, and a non-magnetic pole shield rotor coaxial with said feed rotor and extending across the width of said lower annular pole piece and the several annular ridges thereof.
22. The combination recited in claim 21, in which the feed rotor comprises a hollow wide based cone, presenting a thin annular nozzle about the base thereof and in which said cone has a unitary flat flange extending outward substantially to the wall of the electromagnet structure, and in which the base of the electromagnet -has a cellular structure including a cylindrical REFERENCES CITED The following references are of record in the le of this patent:
UNITED STATES PATENTS Number Name Date 455,984 Fiske July 14, 1891 456,622 Lain July 28, 1891 1,072,277 Ullrich Sept. 2, 1913 2,227,280 Smith Dec. 31, 1940 FOREIGN PATENTS Number Country Date 194,711 Germany Jan. 27, 1908 267,200 Germany Nov. 13, 1913
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US617711A US2582274A (en) | 1945-09-21 | 1945-09-21 | Magnetic separator |
| CH258210D CH258210A (en) | 1945-09-21 | 1946-12-30 | Process for separating magnetic particles from non-magnetic particles and separator for the implementation of this process. |
| GB17460/47A GB646790A (en) | 1945-09-21 | 1947-07-02 | Improvements in and relating to methods of and apparatus for magnetic separation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US617711A US2582274A (en) | 1945-09-21 | 1945-09-21 | Magnetic separator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2582274A true US2582274A (en) | 1952-01-15 |
Family
ID=24474722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US617711A Expired - Lifetime US2582274A (en) | 1945-09-21 | 1945-09-21 | Magnetic separator |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2582274A (en) |
| CH (1) | CH258210A (en) |
| GB (1) | GB646790A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE267200C (en) * | ||||
| DE194711C (en) * | ||||
| US455984A (en) * | 1891-07-14 | piske | ||
| US456622A (en) * | 1891-07-28 | Magnetic separator | ||
| US1072277A (en) * | 1912-01-17 | 1913-09-02 | Georg Ullrich | Apparatus for the magnetic separation of ores and other material. |
| US2227280A (en) * | 1937-09-16 | 1940-12-31 | Franklin S Smith | Apparatus for removing foreign particles |
-
1945
- 1945-09-21 US US617711A patent/US2582274A/en not_active Expired - Lifetime
-
1946
- 1946-12-30 CH CH258210D patent/CH258210A/en unknown
-
1947
- 1947-07-02 GB GB17460/47A patent/GB646790A/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE267200C (en) * | ||||
| DE194711C (en) * | ||||
| US455984A (en) * | 1891-07-14 | piske | ||
| US456622A (en) * | 1891-07-28 | Magnetic separator | ||
| US1072277A (en) * | 1912-01-17 | 1913-09-02 | Georg Ullrich | Apparatus for the magnetic separation of ores and other material. |
| US2227280A (en) * | 1937-09-16 | 1940-12-31 | Franklin S Smith | Apparatus for removing foreign particles |
Also Published As
| Publication number | Publication date |
|---|---|
| CH258210A (en) | 1948-11-30 |
| GB646790A (en) | 1950-11-29 |
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