US794647A - Electrostatic magnetic separator. - Google Patents

Description

PATENTBD JULY 11, 1905.

H. M. SUTTON & L. & E. G. STEELE.

ELECTROSTATIC MAGNETIC SEPARAT OR. APPLICATION FILED FEB. a. 1902.

3 SHEETSHEET 1.

WITNESSES: I E NVENTORS zyflf zaivm F%7z/ E 1 /016556,

PATENTED JULY 11, 1905,

H. M. SUTTON & W. L. & E. G. STEELE. ELECTROSTATIC MAGNETIC SEPARATOR.

APILIOATION FILED r1113. 3, 1902.

3 SHEETS-SHEET 2.

r [TEEN $391 1 PATENTED JULY 11, 1905.

H. M. SUTTON & W. L. & E. G. STEELE. ELECTROSTATIC MAGNETIC SEPARATOR.

APPLTOATION FILED FEB. 3. 1902.

3 SHEETS-fiHEET 3.

UNITED STATES Patented July 1i, 1 905.

PATENT OFFICE.

.HENRY M. SUTTON, WALTER L. STEELE, AND EDWIN G. STEELE, OF DALLAS, TEXAS.

ELECTROSTATIC MAGNETIC SEPAHATOR.

SPECIFICATION forming part of Letters Patent No. 794,647, dated July 11, 1905.

Application filed February 3, 1902. Serial No. 92,870.

To all whom it may concern:

Be it known that we, HENRY M. SU TON, WALTER L. STEELE, and EDWIN G. STEELE,

' citizens of the United States, residing at Dallas, in the county of Dallas, State of Texas,

have invented certain new and useful 1m prove- -ments in Electrostatic Magnetic Separators,

of which the following is a specification, ref- :erence being had therein to the accompanying drawings.

-"T'his invent1'on relates to an electrostatic magn-eticseparator, and: more particularly to a'magnetic separatorm which. the separation is assisted'by the presence of static'electricity.

The invention has for an object't'o produce an apparatus for accomplishing the most effi-' cient magnetic separation in which the action of a magnetic roller is assisted and materially .improved by the presence of a static current,

which separation is also adapted to remove therewith very fine values of gold, which can be subsequently separated by a magnetic treatment alone.

A further object of the invention is to provide an improved form of magnetic separator and also of a cleaner-roller adapted to remove the material attracted to the magnetic roller.

Another object of the invention is to provide a statically-charging moving surface beneath the magnetic rolls, which rolls are inductionally charged from the frame of the machine with a static current in addition to the magnetic current generated therein.

Other and further objects and advantages of the invention will be hereinafter set forth 7 and the novel features thereof defined by the appended claims.

In the drawings, Figure 1 is a side view of the apparatus. Fig. 2 is an end view of the delivery end with parts broken away and in section to show the cleaner-roller and conveyer to deliver therefrom. Fig. 3 is a longitudinal section; Fig. 4:, a vertical section on line 4 4 of Fig. 8. illust ration of the magnetic separation assisted by the static in connection with a subsequent static separation for the removal of the gangue from the remaining metallic parts. Fig. 6 is a detail longitudinal section through the maglating material.

Fig. 5 is a diagrammatic framework mounted upon an insulated base,

as at A, and provided at its lower portion with an inclined hopper A extending the length thereof and having a central dischargespout A. 'Above this hopper a conveyingbelt S is suitably mounted-for instance, upon rollers Q, which are thoroughly insulated from the shaft Y by meansof a disk Q of insu- The belt S is formed of rubber or other suitable insulating material rand is provided upon both faces with a metallic coating m, so as to form a condenser or practically an extended Leyden jar, as shown in Fig. 10. The outside coating upon the belt is charged from a suitable source of static electricity J by means of the comb J, adjustably supported by a suitable connector J mounted upon the pivoted portion H at one end of the hopper, so that by swinging this end portion away from the belt the same may be examined or the take-ups S at the ends of the belt adjusted tomaintain the necessary tension. When it is desired to work with the magnetic current alone, this end portion may be thrown back and the static charge disconnected from the belt. A similar end portion H is provided at the opposite end of the belt. This beltis supported throughout its length by a series of rollers P, of non-magnetic material, mounted upon a suitable support P, extending longitudinally between the upper and lower surfaces of the belt, and these rollers may, if desired, be provided with a coating of rubber, particularly if formed of a metal. (See Fig. 10.)

The belt-frame P and the belt carried theremounted in cooperating relation thereto.

The series of magnetic rollers M are suitably journaled in the framework of the machine, as will be hereinafter described, and adjacent to each a cleaner-roller N is rotatably Beneath each cleaner-roller 'a receiving-hopper O is provided and adapted to discharge'by any desired meansfor instance, a conveyer O, driven by belt 0 from the cleaner, so.

that the material from the hopper B above the belt S is carried by said belt beneath the magnetic rollers, which remove the magnetic particles therefrom, and the tailings are finally discharged into the hopper A. These magnetic rollers are charged from any suitable source of current, such as the dynamo Z and line connection Z, extending to the terminal posts Z which are provided with brushes Z and bearing upon a conducting-ring M, carried upon the shaft M of the magnetic roller M, the opposite ends of each shaft being thus connected to establish a circuit through the magnetic roller, and the series of rollers are suitably wired in circuit by 'means of the connectors Z, as shown in Fig. 3.

. The construction of the magnetic roller M and the cleaner-roller N is particularly shown in Figs. 6 and 7, wherein the pole-pieces l and l are of opposite polarity and have a longitudinal extension 1 secured to their peripheries. This extension is provided with a series of parallel grooves, thus providing a series of points upon each of the extensions extending peripherally thereof, which are of thesame polarity as the pole-pieces. Be-

. tween these extensions a gap or space I is provided, and the cross-section of the extensions 1 1s not suflicient to conduct all of the magnetic lines of force to this gap, so that these lines of force are practically distributed equally along the surface of the extension. The grooves or corrugations perform a very important function, as they individualize the magnetic lines of force at their outer points,

and thus more readily sustain feebly-magnetic particles and also facilitate the removal of the magnetic particles by so concentratingthem at these points that the cleaner-roller can readily receive and remove them in its rotative action. The grooves between the parts are filled with any desired non-magnetic material, so that the roller presents a smooth proper magnetic field.

N is provided with the periphery havirl'g a circumferentially-extend ing series of points of magnetiocontact. The pole-pieces I and I are spaced apart by suitable soft-iron sleeves M disposed upon the shaft M of the magnetic roller to increase the cross-section of the magnet-core, which shaft carries theconducting-d-isk M, from which the wiringM receives its'charge. This wiring is wound, preferably, as shown by the diagram in Fig. 8, so as to extend in reverse directions andpositively charge each of the pole-pieces for'the purpose of establishing a The cleaner-roller shaft N, upon which-an insulating-core N, of any desired material-for instance, woodis secured and upon the periphery of this core a series of magnetic sleeves or collars N are secured a'ndirhay be formed ofsoft ifron of the same dimensions longitudinally as the extensions of the pole-.piec'esfor the magnetic roller,

These sleeves or collars are provided with a series of grooves to form peripheral PIOJGC' tions N, which correspond to the points of the extensions 1 so that in the rotation of the cleaner-roller these ribs travel directly over the points and remove therefrom the magnetic particles sustained thereby. The cleaner-roller N revolves in the same direction as the magnetic roller M, which causes the. peripheries to pass in oppositedirectlons at their point of nearesti contact',"'ai1d these'p'eripheries may b'e-either in contact or very near, so that the magnetic charge is collected upon the cleaner-roller at the point of nearest approach to the magnetic roller and of approximately the same strength as that of-the magnetic roller. The magnetic particles of metal are unable to pass this point 'upon the magnetic roller and are attracted to' and-received by the cleaner-roller, by which they are,

carried overa hopper and discharged therein.

The magnetic field weakens on the cleanerroller in its rotation away from its point of nearest approach to the magnetic rolleruntil a point is reached where the reduced magnetism is not sufiicient to sustain the adhering particles.

Any desired driving means may be used for the purpose of actuating the several movable parts in the apparatus hereinbefore disclosed; 1

but as illustrating a desirable formof such means we have shown in Fig. 1 a driving-shaft 12,, provided with a pulley R, from which a belt extends to any suitable source of power.

This shaft R is also provided with eccentrics R mounted thereon, from which a strap R extends to-the frame of the belt S for the purposeof rapidly shaking the belt by a lateral movement thereof. The shaking device R and R described forms one-means for agitating the material; but any other desired means may be used for agitating the material in a direction other than the direction of feed through the magnetic field and'in a plane substantially parallel with the pole or poles of the magnet. Theshaft R is also provided at the hopper end with a driving-pulley R for commun'fcating power to the pulley R upon the sl aft for the feed-shaker by means of the belt R C, mounted upon the "shaft of the pulley R and connected by a strap C with the pan B beneath the hopper. At the lower portion of the hopper a flexible flap B is provided at the rear side thereof, and this pan is supported from the upper portion of the hopper by means of hangers B pivotally connected thereto at their lower ends. The adjustable strap B extends from the rear portion of the pan B and is connected to the lower part of the hangers B so that the inclination of the pan relative to the lower portion of the hopper may be adjusted andmaintained.

The driving-shaftR is also provided with a cone-pulley 1), cooperating with a pulley D and connected by a belt D adapted to be adjusted by a threaded sleeve D operating upon a securing-shaft D which is provided-at its outer end with a handle D; These cone-pulleys are adapted to vary the speed of the sev-,

eral parts which are driven thereby.

The ore-belt S is driven from these conepulleys by means of a worm-gear. The shaft of the pulley D is provided at one end with a worm D, adapted to mesh with a gearwheel F, carried upon a shaft F, which shaft at its opposite end is provided with the sprocket-wheel F adapted to drive a sprocket F on the end of theshaft of the roll Q, which supports and drives belt S by means of a chain F, extending from the sprocket F to the sprocket F The idler-sprocket F may be disposed to bear upon the chain F, as shown by dotted lines in Fig. 3, and adjusted I to take up the slack in this chain when the ore-belt is raised or lowered for adjustment.

For the purpose of driving the magnetic rollers and cleaner-rollers the shaft F is provided between its ends with a gear-wheel G, meshing with a gear G, the shaft of which is provided with a sprocket from which the driving-chain G extends to a suitable sprocket G", carried upon one end of the shaft of one of the magnetic rollers. The opposite end of the shaft of the magnetic roller is provided with a sprocket G, from which a chain G extends to the sprocket Gr upon the end of the shaft of the cleaner-roller, by which means the latter is driven in the same direction as the magnetic roller. The several magnetic rollers are driven in unison by means of a sprocketchain G, extending the length of the apparatus and engaging sprockets upon each of the rollers, as shown by-dotted lines in Fig. 3. This chain may be held under tension by means of the idler G. (Shown in Fig. 3.) By means of these driving connections it will be seen that the speed of the shaft F can be altered by means of the cone-pulleys and that This shaker C consists of an eccentric the ore is fed.

both the traveling ore-belt and the magnets are driven from this shaft, so as to reverse their direction of rotation and to preserve the same relative speed whenever the driving speed is altered. In practice the surface speed of the belt and the peripheral speed of the magnetic rollers are exactly the same, so that the momentum of the magnetic particles will not be retarded nor its speed increased by being taken up by the magnets.

In Fig. 5 this invention is shown in connec-' tion with a static separator of a type similar to that shown in Patents Nos. 670,440 and 670,441, in which the static charge for the oreconveying belt S is received by induction from the main static se parator-belt L, which is statically charged from a suitable brush or comb J communicating with a source of static electricity. The belt L of the main static separator passes beneath a suction device L, having a screened surface by which the metallic particles are repelled and through which the non-metallic particles are drawn by the This screened surface is grounded In the modified application of the invention shown in Fig. 9. the traveling orebelt is omitted and the ore delivered from the hopper B directly onto the surface of the magnetic roller M, from which the magnetic particles and flourgold are removed by the cleaner-roller N which discharges into a hopper 0, communicating with a suitable receptacle 0, while the non magnetic particles passing over the magnetic roller M are delivered into asuitable receptacle 0. In the apparatus shown in Figs. 1 to 4 the magnetic roller is charged with static electricity secured by induction from the belt S on the frame of the machine and magnetically energized from the dynamo Z or other suitable source, so as to exert its attractive influence upon the statically-charged belt from which This beltis charged by induction from any suitable static generator, so that the particles of ore thereon are repelled from the belt toward the magnetic roller, which collects the magnetic particles and deposits them within the hopper through the action of the cleaner-roller. The material advantage of this arrangement is that the particles which are feebly magnetic are thus brought within the influence of the magnetic roller, which is thereby saved from exerting the lifting energy necessary to attract and move the magnetic particles within or under the mass of ore upon the belt. The charge of static electricity upon the belt causes the particles'of ore to mutually repel each other while they are being attracted by the statically-charged ma netic roller. In this manner the magnetic 'particles are rendered perfectly free to-move in the lines of magnetic force and are not obstructed by the .gangue of the ore. With the use of the statically-charged magnetic roller it has been found that much of the very fine goldfollows the magnetic particles,

thus making a magnetic concentrate of the iron and gold. This is due to the well-known law that two particles statically charged at diflerentpotentials attract'each other, and this tween the gold and iron particles, which causes space.

them to adhere, the iron being carried by its magnetic attraction to the roller. While it is desirable in some instances to make a clean concentrate of the iron from the goldvalues,

it frequently happens that when the gold is extremely fine it is advantageous to carry it with the iron, particularly whenan electricallyrepulsive screen is used to repel the, metallic masses in the electrostatic separation. It has been found that a much greater difference of potential between the screens and staticallycharged beltjs required to separate very small metallic particles from the ore than for the separation of larger particles, and this difference of potential can only be maintained by increasing the distance between the belt and the screen, as thus a larger charge accumulates on each in an effort to bridge the intervening This action charges the metal within the field .more strongly than otherwise; but at the same time it diminishes the amount of gangue that passes from the ore through the screen, as the discharge across this space is not as frequent aswhen the screens are close,

to the belt. The fine gold particles are but little more than points, and on account of the extremely small surface that they present a very strong static charge is required to control-them, so that it will consequently be seen that if the fine particles of gold and' the sharp angular iron are removed from the ore more of the static electricity can be used to move the gangue of the ore and less will be needed to control the larger metallic particles. The

gold can be removed from the magnetic concentrates by a magnetic separator which is not statically charged.

. In addition to the advantages and coiipera: tion heretofore pointed out in relation to the magnetic and static separators it will be noted that by charging the surface of the It must be understood that we do not confine ourselves to statically charging the belt, for the same results are obtained by grounding the belt and charging the magnet-roller, and therefore either method may be used, de-

pending on the nature of the material and the convenience of working the same. It will also be apparent that the magnetic separator may be used without the static charge when Ifa.

so desired and is adapted for use in other I forms of separators than herein shown.

Many mlneral substances have nonmagnetlc metallic bases, which become susceptlble to magnetic attraction if they aresimultaneously charged electrostatically, thus effecting a separation which cannot otherwise be secured. Assuming that the belt S is electrostatically charged with the positive sign, the magnetic roller M will be charged inductively with the negative sign, and there is a zero-line intermediate between these two surfaces where the opposing electrification of one surface will neutralize that of the other. Now if the ore be fed upon the belt in a thin layer the, particles will be attracted to-' ward the roller by the static force and on coming in'contact therewith will be again repelled by the same force. in actual practice there are many of these substances which are partially conductive and do not actually come in contact with the magnet, but lose their initial electrification soon after crossing the zero-line into an opposing field. Gonsequently if the electrostatic charge is properly regulated these substances can be kept oscillating backward and forward across this zero, and thus practically suspended inspace. Another feature of the electrostatic attraction is that the movement of particles of matter under this influence is very sluggish and this sluggishness is increased as the distance between the opposing surfacesis increased. Particles'of matter under magnetic attraction move with celerity toward the inducing-magnet; but their speed is increased as the square of the distance is decreased, while with electrostatic attraction the velocity of the particles can be made practically uniform. This is due to the fact that the particles after passing the zero-line begin to lose their initial electrification, which loss varies with the dielectric medium used, which may be air, liquid, or any well-known me- .dium. It will therefore be noted that the mass containing paramagnetic particles is electrically suspended in adielectric medium, i v

and the removal of these paramagnetic particles is eflected by a magnetic force. Furthermore, the ore upon the belt, the surface of which is statically charged, passesunder the magnetic roller, which is similarly charged by induction and rises toward the magnet at the same time, spreading in all directions, which is caused by the mutual repulsion of the particles which havebeen statically charged. After touching the magnetic-roller the nonmagnetic gangue immediately returns to the belt, while the magnetic particles adhere and are removed by the cleaner-roller. The actual effect secured is that the ore mass loses its weight and the magnetic particles While being attracted by the magnet have no specific gravity or weight. The spreading effect is an important feature, as it opens the mass of ore and allows the magnetic particles to follows the true lines of magnetic force, as by the general mutual repulsion other particles come near to offer obstruction. It will also be obvious that the positive charging of the belt and the inductional charging of the magnetic roller may be reversed or otherwise arranged to secure a similar-result.

It will be obvious that changes may be made in the details of construction and configuration of the several parts and of the auxiliary devices constituting parts of the apparatus without departing from the spirit of the invention as defined by the appended claims.

Having described the invention and set forth its merits, what we claim, and desire to f secure by Letters Patent, is

g 1. In an electrostatic magnetic separator, a

magnetically-energized roller, and a staticallycharged member adapted to convey ore to said roller and to charge the ore, substantially as specified.

2. In an electrostatic magnetic separator, a magnetically energized roller, a statically charged member adapted to convey ore to said roller, and means for discharging metal carried by said magnetic roller; substantially as specified.

3. In an electrostatic magnetic separator, a magnetically energized roller, a staticallycharged member adapted to convey ore to said roller, and means for magnetically discharg-' ing metal carried by said magnetic roller; substantially as specified.

4. In an electrostatic magnetic separator, a magnetically energized roller, a staticallycharged member adapted to convey ore to said roller, means for discharging metal carried by said roller, and a frame for said static member insulated therefrom and adapted .to support and charge the magnetic roller; substantially as specified.

5. In an electrostatic magnetic separator,-a magnetically-energized roller, a staticallycharged member adapted to convey ore to said roller, means for discharging metal carried by said roller, a frame for said static member insulated therefrom and adapted to support and charge the magnetic roller, and a conveying device above said static member for removiirgi metallic particles; substantially as specimagnetic roller and adapted to lie adjacent to said faces and rotate in the same direction therewith; substantially as specified.

8. In a device of the class described, a magnetic roller comprising a series of magnetized faces insulated from each other, means for magnetizing said faces, means adapted to feed ore to said roller and an inductionally-charged cleaner 'roller composed of a metallic face adapted to be inductively magnetized from the magnetic roller to collect material lifted I thereby; substantially as specified.

9. In a device of the class described, a magnetic roller comprising a series of magnetized faces insulated from each other, means 1' magnetizing said faces, means adapted to feed ore to said roller, a cleaner-roller composed of an insulated body and metallic face adapted to be inductively energized by the magnetized roller, and a trough extending beneath said cleaner-roller; substantially as specified.

10. In a device of the class described, a magnetic roller comprising a series of magnetized faces insulated from each other, means for magnetizing said faces, means adapted to feed ore to said roller, a cleaner-roller composed of an insulated body and metallic face adapted to be inductively energized by the mag netized roller, a trough extending longitudinally beneath said cleaner-roller, and a conveyer Within said trough for removing mateterial from said trough; substantially as specified.

11. In adevice of the class described, a feedhopper, a shaker-pan disposed in a horizontal plane beneath the discharge therefrom, means for oscillating said pan transversely of the hopper-discharge, a flexible wall at the rear of said discharge, a hanger pivotedly supported from the upper portion of said hopper, means for pivoting said pan between its ends, to said hanger at the lower end of said hopper, and an arm adjustably secured to the lower end of said hanger and pivoted to the rear of said pan; substantially as specified.

12. In a device of the class described, a magnetic roller comprising a shaft, a series, of plates located therein, conducting-cores disposed between said plates, magnetizing-wind- 3 ings upon said cores, lateral faces at the peripheries of said plates,aconducting-ring communicating with one end of said winding, a cleaner-roller comprising an insulating-base,

and magnetic metal surfaces thereon disposed in alinement with the faces upon the magnetizing-roller; substantially as specified.

. 13., In adeviceof theclass described, amagnet-roller comprisinga shaft, a series of plates, conducting-coresdisposed between said plates, magnetizing-windings alternating in direction upon successive cores, lateral ribbed faces at the peripheries of said plates, a conductingring communicating with one end of said winding, a cleaner-roller comprising an insulatingbase, ribbed magnetic metal faces thereon disposed in alinement with ribs upon the magnetizing-roller, and means for rotating said cleaner-roller and the magnetic roller in the same direction; substantially as specified.

14. In an electrostatic magnetic separator a magnetized attractive surface, means for feeding material thereto and discharging therefrom a source of a voltaic current for energizing the same, and a source of static electricity to charge said surface, whereby metallic particles magnetically held by said surface will sustain other particles by reason of difference in potential thereof; substantially as specified.

15. In adevice of the class described, a statically-charged belt, a magnetic roller disposed above the same, and means for removing metal caaried bysaid roller; substantially as speci- 16. In a device of the class described, a static separator, a statically-charged belt above said separator adapted to be energized by an inductional current therefrom, and a magnetic roller charged by the inductional current from said static separator; substantially as specified.

17. A magnetic separator comprising a magnetically constantly -energized surface, means for feeding material thereto, and a cleaner rotatable adjacent to said surface and magnetically energized by induction therefrom to remove material from said separator; substantially as specified. I

18; In adevice of the class described, a traveling conveyer-belt and supporting-frame, means disposed above the same adapted to raise and convey material therefrom, a drivingshaft extending longitudinally of the belt, and carrying eccentrics, straps extending from said belt-frame to said eccentrics, a spring-- support for said belt to permit vibration th ereof, means for adjusting said belt vertically relative to the raising means above the same, a hopper extending longitudinally beneath said belt, and rollers carried by the upper surface of said supportingframe; substantially as specified.

19. Ina device of the class described, a traveling cenv'eyer belt and supporting 4 frame, meansh'isposed above the same adapted to raise and convey shaft extend carrying eccentrics, straps extending from said belt-frame to said eccentrics, a springsupport for said belt to permit vibration theret'erial therefrom, a driving-- ngitudinally of the belt and of, means for adjusting said belt vertically relative to the raising means'above the same, rollers carried by the upper surface of said support, supporting-rollers for said belt at opposite ends of said support, a speed-regulating device "carried by said driving-shaft,

and gear connections to said speed device "to grilve the belt-rollers; substantially as speci- 20. In a device of the class described, a traveling conveyer-belt, meansdisposed above the same adapted to raise and convey material therefrom, a driving-shaft extending longitudinally of the belt and carrying eccentrics,

straps extending from said belt to said eccenterial, a metallic surface upon one face there.-

of, means for electrically charging said 'metallic surface, and a magnetic separator to collect from said surface; substantially as specified.

22. In a device of the class described, a conveying-belt, a magnetic separator to collect from said belt, a hopper for discharging material thereon, a receiving-hopper extending mounted end portion-to said lower hopper disposed at one end of the belt, and a brush or terial thereon, a receiving-hopper extending longitudinally beneath the belt, a'pivotallymounted end portion to said lower hopper disposed at one end of the belt, a brush or comb carried by said end portion for electrically charging the belt, a, rotatable magnet above the belt, a support between the layers of the belt, and a bearing-roller upon said support beneath said magnet; substantially as specified.

24. In a device of the class described, a conveying-belt, a rotatable magnetic roller above the same, means for magnetically charging said roller, an inductively-magnetized cleanerlongitudinally beneath the belt, a pivotallylIO comb carried by said end portion for elecroller adjacent to the magnetic roller, a hopper above said beltand beneath said cleanerroller, and a conveyer in said hopper driven from said cleaner roller; substantially as specified.

25. In a device of the class described, an oreconveying belt supported for lateral vibration, a driving-shaft extending longitudinally of said belt and provided with eccentrics for vibrating the belt, a hopper having a shakingpan beneath the same, a driving connection from said shaft to reciprocate said pan, a speed-regulating mechanism operatively connected to said shaft, a transverse countershaft driven from said speed-regulating mechanism, means carried by said counter-shaft for driving said belt, a rotatable magnet above said belt, and a gearing from said countershaft for rotating said magnet; substantially as specified.

26. In a device of the class described, an orcconveying belt supported for lateral vibra-' tion, a driving-shaft extending longitudinally of said belt and provided with eccentrics for vibrating the belt, a hopper having a shakingpan beneath the same, a driving connection from said shaft to reciprocate said pan, a speed -regulating mechanism operatively connected to said shaft, a transverse countershaftdriven from said speed-regulating mechanism, means carried by said counter-shaft for driving said belt, a rotatable magnet above said belt, a gearing from said counter-shaft for rotating said magnet; a rotatable cleanerroller adjacent to said magnet, and a gearing from said magnet to drive said cleaner-roller;

substantially as specified.

27. in a device of the class described, an oreconveying belt supported for lateral vibration, a driving-shaft extendinglongitudinally of said belt and provided with an eccentric for vibrating the belt, a hopper havingashaking-pan beneath the same, a driving connection from said. shaft to reciprocate said pan, a speed-regulating mechanism operatively connected to said shaft, a transverse counter shaft driven from said speed-regulating mechanism, means carried by said counter-shaft for driving said belt, a rotatable magnet above said belt, a gearing from said counter-shaft for r tating said magnet, a rotatable cleanerroller adjacent to said magnet, a gearing from said magnet to drive said cleaner-roller, a hopper beneath said cleaner-roller having a conveyer therein, and a gearing from said conveyer to said cleaner-roller; substantially as specifiedl 28. In adevice of the class described, a conveying-belt, a magnetic roller above the same, spring-supports at the opposite sides of each end of said belt having threaded lower ends, means for laterally reciprocating said belt, fixed rotatable threaded sprockets to support and feed the spring-supports by engaging the threaded ends thereof, and chains for connecting the sprockets on opposite sides at each end of the belt to adjust those at either end simultaneously and each end independently; substantially as specified.

29. In a device of the class described, a conveying-belt, means for statically electrifying the same, a magnetic separator to collect from said belt, a supporting-roller at each end of the belt insulated from its journal, and asupport for said rollers having an adjusting device for maintaining the belt under tension; substantially as specified.

30. In adevice of the class described, amagnetic roller, a cleaner-roller adjacent thereto having an insulated body and a metallic sleeve or collar thereon provided with a series of {peripheral projections; substantially as speciv 31. lin a device ofthe class described, a cleaner-roller having an insulated body and a metallic sleeve or collar thereon provided with a series of peripherial projections, and amagnetic roller provided with a peripheral polepiece having points or projections inalinement with those on the sleeve of the cleanerroller; substantially as specified.

in testimony whereof we afiix our signatures in presence of two witnesses.

HENRY M. SUTTON. WALTER L. STEELE. EDWIN G. STEELE.

Witnesses:

()LIVER STEELE, OLIVER V. STEELE.

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