US1380871A - swart - Google Patents

Description

- W. G. SWART, F. A. JORDAN, E. W. DAVIS AND T. B. CDUNSELMAN.

APPARATUS For; MAGNETIC slzlNG AND GRADING' oF-omz.

APBLlCATlON FiVLED SEPT. H. 1917.

1,380,871. Patented Jun@ 7,1921.

4 SHEETS-SHEET 2.

w. G. swAIIT, F. A.l JORDAN, E. w. IIIIvIs AND I. COIINSELIIIIAN.

APPARATUS*v FOR MAGNETIC SIZING AND GRADING 0F OBE. APPLICATION FILED SEPT. II, Isij.

1,380,871; Patented June 7,1921.,

4 sIIEEIs-s'IIEET 3.

w. G. swAIII, I.'II JORDAN, E. w. DAVIS ANDI. B. GOUNSELMAN.

APPARATUS FOR MAGNETIC SIEING ANDy GRADING OFOBE.

APILICATION man SEPI.v I I. e917.

1,380,871.. Patented me 7, 19:21.-

elevators and the screens areworn yout in To all/whom t may concern." f v UNITEDA STATES? PATENT OFFICE.

wALrEnG. swARr, FRED A. JORDAN, 'nnWRD w.`fDAvIfs, AiIDEHEO'DE .3.... COUNSELMAN, oF DiULU'rn;iviINivEsorrA.` f f i Lesoti.

Be it known that we, WALTER Gg. SwAii'r,

FRED A. JORDAN, EDwaiiD W. yDavis, andv Tiinononn B. COUNSELMAN, citizens of the'V United States, residingy at Duluth,.in the i county of St. Louis and State ofMinnesota,

have invented certainnew and useful -Im-i provements' in Apparatus forfMagnetic .Sm-

ing and'Gradingfof Ore, ofwhichthewfollowingis a'specific'ation. f Y z" 1 This invention relates to improvements in apparatus for the magnetic sizing and grading of ore, and has for its object to`provide apparatusV for that purpose by which the` use of belt and bucket elevators, or similar devices, and also the use lof sizing screens, may be dispensed with. `In present day processes and apparatus for the magnetic separationV and concentration @of pres, in

so far as preliminary sizing-'and separation is concerned, bucket elevators are most'generally usedbetween thevfapparatus and thel` different stages, Vand screens'for sizing and grading the ore as to sizeV are vutilized Vbe-k tween the various steps Both the bucket a comparatively short time,idue to the 'abra-y sive and destructive action of thefbroken;y ore, andv these elements requirefrequent re. placing, which requires considerable expense not only for replacement, but for. the time required therefor, and necessitates the closing down and throwing out of operationof By our apparatus we are en-i abled to size and grade the ere more economi-k thev mills.

of the preliminary sizing, grading, andcrushing. l

Another obj t vide a` separating cobber, or the like, with magnets so arranged as to present a fieldof varying intensity through which the crushed ore particles pass, whereby it is possible to.

' throughout the drawings. In Fig; 1 is shown a perspective view of ect of our invention isto pro-` described later;

kAriiiitlrrus ron MAGNETIC fsiznvev AND eRfADiivG or y01mv `Y n "vspecivcatoniorf Letters Patent. V133,113,91'litgduneif, 1921 .ippiieaupniuea september i1,k i917. @seriai No. 190,719; *j

classify the ore, as described'above and f will lbemore fully explained hereinafter.r Still'another object of our invention is -to provide apparatus by'which'crushed ore con-k -taining magnetically susceptiblemate'iial is subjected' to the action of velocity and 'magknetic attraction, inorder to "enable us 'tof v separate from'the high grade` and valuable ore particles the large sized tailing particle'sand theksinallersized tailing particles,v andthus enable us to dispose ofthese two` sizes as a` by-product for use as railroad ballast and road-building material,1as well as obviating the necessity for furthers'creenf ingk and Sizing'befo're disposing ofsaid tail' ings.l l,

"pf Infthe `accompanying fdrawingsl kFigure 1 is al perspective viewV ofon'e cobbersetf` Fig.l 2 is a side elevation of the same.

Fig. 3 is a diagrammatic view of la wiring arrangement` to permit variation of the in-j.`

ltensity lof the magnets of Lone cobber.l

Fig, 4 is'adiagrammatic flow sheet, showing4 one karrangement of multi-stage apparatus. y ,f f

fFig. 5 is a similar view of a different ar'- rangement; and D 'l Fig. 6 is. a similar view of still another arrangement. a I

Like `.numerals refer yto like elements one cobber set, the showing being partially diagrammatic for clearness. 10 designates a pulley or drumfrotating with a hollow shaft 11, which rotates upon the hollowf sleeve or shaft 14.` 12 designates a' driving belt' operating the pulley 10. A'belt con-`r veyer 17, 'preferably `of resilient material, such as rubber', to resist the abrasive actiony of the ore particles,.passes around the pul-v ley 13 and around the cobber drum 15, which is driven by the hollow shaft 11 and rotates upon the hollow sleeve 14. 18 isa chute leading from the preliminary crushing rolls Vand 'deliveringthe ore as it is first crushed from the rollers-,see Fig.` 4, for examples-fupon the belt 17, by which it` 'is conveyed to `thecobber drum, as shown i in Fig. 1. Partitions -,A,\B yare shown. inFigs. 1l and 2 and Z, respectively, as will be morefully StationaryV magnets, Agen#- erally indicated by numeralv 20 and specifi-v yas providing deposit bins or spaces X, Y, i

cally indicated bythe letters a, b, c, ai, e, f, and g, are provided, as shown in Fig. 3, the same being connected by the magnet yoke 20 carried upon the hollow sleeve 16. The main branch or feed wires 21, 22 are provided, and excitation current wires surroundvr each' of the magnets 2O and are located in parallel between the :feed Wires 21 and 22. In Fig. 3 we have Shown a rheostat 241 as being provided in each of the magnet circuitsfor the purpose of `varying the current flow through the coils 23 and permitting individualregulation of the intensity of each magnet. It will be obvious that any number of magnets of any desired excitation may be provided without departing from the spirit of the invention.

In Fig. 3 we have shown magnets c, b, and f, g as being more strongly excited than the intermediate magnets, for a purpose Yhereinafter to'be described. y.

lIn Fig. 4i is illustrated a multi-stage apparatus in diagrammatic Vform, in which crushing rolls 7 receive the ore by the chute 6, through the medium oi the conveyery 5, from thebin or the like-not shown. As stated above, after crushing by the rolls 7, the crushed particles of the desired size, for example, two inchmesh, are deposited upon the resilient belt 17 and carried tothe first cobber 15, by'wh ich a two-part-separation apparatus. All'the other particles are deposited by the shed 31 upon the conveyer belt 170, for conveyance to the second cobber drum 150, which also effects a two-part separation, whereby large tailing particles of low magnetic susceptibility are carried by the-shed 32 to a collection receptacle 32, thus dispensing with their further crushing and treatment by this apparatus, and thereby increasing its capacity in the further stages of operation. All other particles are carried by the cobber drum 150 and shed 32 to' a second set 'of crushing rolls 70, which deposits them as crushed to a smaller size upon the second conveyer belt 170, by which they are conveyed to a third cobber 151, similarfto the cobber 15, and a two-part separation is again effected, as described above., `Si'ibsequent operations similar to those first described are carried on according to the nature and necessary treatment of the' ore until the final preliminary stage,

where the last cobber drum 155 finally sepa-Y rates the ore particles, depositing the tail,-

ings upon the conveyer or the like, and the inal fines upon the conveyer y for removal to the ball mill-notshoivn.Y

In Fig. 5 is shown another iiow sheet embodying a slightly modilied' form of appara-I tus which utilizes the conveyer 5, chute 6, preliminary crushing-rolls 7, chute 18, and iirst cobber 15, as in the apparatus of Fig. 4. The cobber 15, however, in the Jform shown in Fig. 5 is operated Ato effect a three-l part separation, as inthe structure of Figs. 1 to 3, save that while the lines are collected in thev bin 5() and rthe middlings carried by shed 51 to the second set of rolls 70, the large tailing particles are deposited by shed 52 upon the :conveyer belt 170 for a second treatment by cobber 150, which separates the large tailings into two parts, one of which consists or' the particles of low magnetic susceptibility. These particles are deposited by shed 150 in the collection bin or space 32', While the large tailing particles, considered ot suilicient metal content to render their further treatment desirable, are `carried by the shed ,150 to the rolls 7() with the middlings. Subsequent stages utilize the same apparatus as that iirst described to perform subsequent similar operations, the retained middlincs in each instance bein@ crushed smaller and smaller until the final separation takes place by means or" cobber 155.

In Fig. 6 is shown still another form or arrangement of apparatus in which a single cobber drum is utilized in each stage .of operation after crushing of the ore by pre'- liminary crushing rolls 7, and its deposit by chute 18 upon the conveyer belt 17 for conveyance to the iirst cobber drum 15, which, asin the showing of Figs. 1 to 3, effects a three-part separation, the fines and small particles being deposited in bin Z, the large tailings being deposited in biirX, and the middlings and all particles of varying metal content being carried by the partitions A, B to the second set of crushing rolls 70. These operations are repeated as many times as are desirable until iinal separation by the last cobber drum 155, as in the other forms e. magnetic poles; and the force of gravity. In thetravel of the particles to V'the cobber drum, were the magnets not eXClteCl iis the particles, save' yas v-aiiected by the resisti ance to their movement by the air through which they pass,would be' projected out-v wardly in va path approximating a para-` bola. The large particles are naturally less aiected by the resistance of the air and travel farther from thefcobber drum than lwould the smaller particles, and more closely approximate ,this-` parabolic trajec would be( affected to little or no extent by the magnetic attraction, and are yprojected a substantially greater distance from the cobber than the particles containing iron ore, for example-such as magnetite. y'Large particles of low or middling grade,'as stated, will be attractedto the cobberry drum by the magnets according tothe `distance of their magnetic center of attractionfrom the magnet poles. In fact, alll particles having any magnetic susceptibility will be so affected, and the small high grade particles, being in coin,- paratively close proximity to the source of magnetic attraction, will be retained in close contact with the cobber drum and, by proper regulation of the magnet intensity,the middling particles, especially those of comparat tively large size, will be carried through a lesser arc of travel by the cobber drum,

owing to the action of the momentum, the force of gravity, and the comparatively weak attraction exerted upon them, while the small high grade particles or fines will be carried through a greater arc of travel, and advantage is taken of this fact to efect the three part separation above described.:

This efect may be enhanced jby the proper regulation of the magnetic intensity,- as shown in Fig. 3, for example. The rheostats controlling the current flow around the different magnets and are so arranged as to y present a comparatively strong magnetic lattraction of the magnets 0:, b, which first exert attraction upon the ore particles as they are conveyed to the cobber. This relatively strong attraction will not affect the largek low grade and tailing particles of low magnetic susceptibility, which will be thrown outwardly as described above. It may, however, be of suiiicient strength to cause the middling` particles, especially those of large size, to beheld by the cobber drum until the large tailingparticles have been rejected, and 'when in the course of its travel the excitation of the less excited magnets c, d, and e is encountered the force of gravity and the momentum is suiicient to counteract the attraction of the magnets upon these larger middling particles, and they will accordingly drop in the bin B, as described. This weaker excitation, however, will be suflicient to retain the fines and particles of great magnetic susceptibility upon the cObberdrUm, 'although7 the excitation may be .so `controlled as to permit 'large particles of relatively great ymagnetic susceptibility yto passvwiththe middlings as requirlng tur-1y ther crushing. As the magnets f and g exert their attraction" upon kthe particles which still cling tothe cobber drum, they` will retain the fines and particles of great ymagnetic susceptibility until the middlings and; i

largefretained `particles haveall `been rek .jected or allowed yto drop .so that the fines rmay be readily separated and deposited in the bin Z as they pass beyond the attraction of the magnets. This three-part separation :permits thei early and preliminary rejection of the' large tailing particles, asstatedabove, which ydoes away with the necessityy for furthe'r treatment and crushing by this apparatus, thereby considerably increasing the capacity of the apparatus, by eliminating thematerial which-it is' unnecessary further `to treat and crush.y The samer is true of the linesor high `grade concentrates which may be takendirectly to the final crushing.

element, suchias ra ball mill, previous,u to

the final concentrationa- By utilizing our apparatus 1n an initial' stage, separating the large tailing particles from the remainder of the crushed ore, we

obtain relatively large tailing particles capable of use as railroad ballast, while the ysmaller tailing particles are carried into the Vbin or space with middlings and larger high grade particles. A second stage ofy treatment in a similar manner will result in the reduction of these tailings of'smaller size,

nets may be varied-all without departing rfrom the scope or spirit of our invention as defined in the appended claims.

What we claim is l. In apparatus of the class describeda rotatable drum and a series of electro-magnets distributed in arcuate form within and adjacent the periphery of said drum and con 1 2;.,In apparatus` .of the cla-ss describedY a rotatable drum aVV series of electro-magnets distributed in arcuate form` Within and adjaceni-l the"y periphery of said drum and eo-act ingtherewitlrto attract magnetically susceptible particles carried thereto and means to vary the strength of the exciting current of said magnets independently each other as desired.

3. ny apparatus of the class described, a drum, al belt running on said druml tof convey ore particles. thereto, a plural-ity of magnets located Within said' drum, saidV magnets being regulable as to attraction', to magnetically attract midd'ling ore particles and large rately and independently regulable as tol magnetic strength to withdraw allr save the tailing particles from the path of the latter and tothereafter Withdraw the fine concentrates fiom the remainder.

y 5. In apparatus of the class described, a drum, means to deliver ore particles rto said drum, aplurality of magnets located Within said drum, all ofsaid magnets being 0perativev vte attract magnetizable particles, eertain of said magnets being of relatively great excitation, others of said magnets following said magnets of. greater excitation being of weaker excitation, and certain otherpoi' lsaid magnets following said magnets of weaker excitation being of relatively greater eXcitation..

Intestimony whereof, We have subscribed our names. v i

VALTER G. SVVART.

FRED A. JRDAN.'

'ED'l/VARD VV. DAVIS.

THEODRE B. CONSELBAN. Witnesses i Y LYDrA M. l/VooDBRmGE,

H. N. MAGHARG.

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