US499347A - Centrifugal ore separator - Google Patents

Description

(No Model.) 3 sheets-Sheet 1.. 0. B.l PEGK. .GENTRI-PUGAL ORE SEPARATOR. I

No. 499,34?E Patented June 13, 18093.`

(No Model.)l

' 3 Sheets-Sheet 2.- 013.12EUR. GENTRIFUGAL ORB SEPARATOR.

' Patented June 13, 1893.

44%. @www l 3 Sheets-Sheet' 3.

(No Moden.)A

l0. B. PBGK. GBNTRIFUGAL om: SEPARATOR.

PatentedJune y13, 1893.

vllnlllrlllllllllrl/ UNITED 1 STATES oRRIN/nrncit, or CHICAGO, ILLINoIsAssIGNoR To MELINDA PEcK, or

PATENT OFFICE. `1

SAME PLACE.

CENT-RIFUGAL ORE-s EPARAToR.

SPECIFICATION forming part of Letters Patent No. 499,347, dated .T une Application tiled February 9, 1893. Serial No. 461.594. (No niodel.)

ToaZZ whom it may concern,.-

Beit known that I, ORRIN B. PECK, acitize'n of the United States, residing at Chicago, Illi nois, have invented certain new and useful Improvements in Centrifugal Ore-separators, of which the following is a'specication.

In the drawings, Figure 1 is a central, longitudinal, broken, sectional elevation of my improved machine.

Fig. 2 is a cross-section of Fig. l 0n line 2, 2, looking in the direction of the arrows. that side of the defeotor or inner vessel, containing the holes or perforations, and partitions hereinafter described with the part Il, omitted. y Fig. 4 is an end elevation of Fig. 1 on line 4 looking in the direction of lthe arrow. Fig. 5'is an'end view of a portion of the apparatus partly in section, taken on the line 5 ofFig. l; and Fig. 6 is a side elevation of the wheel G, detached and provided with'a r greater number of `arms than in Fig. 5.

In making my improved centrifugal ore separator,l make a bed or frame, A, provided with brackets or standards A', on which the operative parts are intended to be mounted. I. make a treatment cylinder, B,'although not necessarily a vessel or cylinder in a technical sense, as it may b e any kind of a vessel that' will serve the purpose, and' by the use of the word cylinder I mean to include any kind f of a vessel in which the treatment may be carried out and with which the other parts may operate and preferably partlyclose it at Vits vends, so as to be adapted to contain a body of water, or a suflicient quantity of water to submerge the separating surface and the material under treatmentand provide it with a separating surface A2, on its inside, orforming its interior wall. This vessel is preferably arranged i-n a horizontal position, and is mounted on the brackets A', supported by suitable journals or trunnions in bearings a. It is preferably provided with a belt surface,

.13', so that it may be rotated by means of a belt, B2 operated' by any convenient motive power, although if preferred, other means may be used for rotating it. v

The vessel or cylinder, B, is preferably bell, or cone shaped, and provided with trunnions, b, which rest in the bearings,- a.. These'shafts or trnnnions are hollow, as shown in the draw- Fig. 3'is a side elevation of.

ings, for the purposes hereinafter described.

The vessel may be also provided with hand holes, b to permit access into its interior, if

v desired, for cleansing and other purposes. If

desired, however, the vessel or be'straight, or in other form, and it may be arranged in a vertical,iustead of a orizontal position.

Arranged within the vessel, B, is a dellector,

cylinder 'may 0the outside of which, or the larger portion thereof, preferably corresponds in form to that of the inside of the treatment vessel, B, leaving an annular space or channelA5, between them, with the partitions, orparts located therein, as hereinafter described, and

described. I Wish to say here, however, that y Ywhile I have shown' the dellector as a vessel,

yet, as its `main object is to form the inside Wall of .the passage or channel in which the separation of the lighter material, or the lighter from the heavier is "eifected, and to afford means throughvwhichJ the heavier material is collected, it is not essential that it be in the form shown, and any other arrangelong as it serves to form the inner walls of the Ways or channels in which the material is treated, and where the vessel form of deliector is not used other means are employed to rcmove or assist in the removal of the heaviermaterial. Nor need the channel in which the material is treated be annu-laror extend entirely around the interior of the treatment vessel, as separate channels may be used instead of one continuous annular channel if preferred. I

i ment may be adopted that is preferred, so

shallfor convenience, however, describe the my improvements as they are exhibited in the drawings, and merely make the above explanationjto showjthat I do not intend to limit myself` strictly to details of construir` l construction, arrangement and operations of tion, for as much latitude may be indulgedin the form, construction or details thereof `as desired, and the' circumstances or conditions will permit.

The defiector, C, is preferably provided at one end with a hollow shaft or trunnion, c, which extends out through one of the hollow trunnions of the vessel, and is supported in a bearing, c'. The other end of the deiiector is preferably journaled at c2, on the shaft D. In order to rotate the deflector I have mounted a pulley, C on the end of the trunnion, c, so that it may be rotated by a belt, operated by any convenient motive power, although other 4 means ma'y be used, if desired, for rotating the deflector. Preferably inside of the dehector, I provide a compartment F2, of a form to permit the wheel G, to be rotated therein; I also prefer to form alchannel or passage F' within the deflector along one wall or side thereof, and closed with respect to it, a1- though communicating with the compartment F2, I prefer that a portion of the side, or wall of the deiiector should form theouter -wall of the passage F and that such portion of the wall be supplied with holes or perforations, f to permit of the inflow of water and material to the passage as hereinafter described.

I arrange a-shaft D, in suitable bearings, This shaft is extended out at one end through the hollow trunnion of the vessel, and

' at the other through the hollow trunnion, c,

of the defiector, s o that it may be rotated by4 a pulley, D', or other convenient means. The shaft D, is preferably made hollow at both ends as indicated by g and `g2 and provided with a Water supply pipe g3 at the end g by meansr of which preferably, comparatively clean,'^or cle'ar water is supplied through the passage g', in the shaft and the perforations d', and into the interior of the' defiector. Along each side of the passage F', and through the walls' of thedeflector, I prefer to, provide holes or perforations f, through which the wa ter introduced into the deilector, or part thereof, may be'driven by the action of centrifugal force against the separating surface ora portion thereof to stir, detach, or disturb the particles of heavier materiali-lodged on the separating surface, as it iscarried around close to the perforations by reasonof the differential speed of rotationof;theseparts. On the out-'- side wall ofthe defiector, and aroundfthe holes or perforations therein, I, prefer toffprovlde one 'or more 4projectingedgingsbr ribs d2,

Vwhich are intended tosextendouta sufficient.l

distance, so as to come closeio the separating surface, leaving, however, a suiiicient space between the surface .and rib to permit the heavierlnaterial'lodged on the separating surface to be carried throughsuch space, 11nder the rib or partition, as I mayvterm it this 'partition serves as'means to prevent, orassist in preventing the 4material being introduced t rial tothe treated orlseparatedls being introfor treatment and containing lighter particles, from being deposited, or flowing on that porparticles ar'e being removed. It also assists in preventing heavier material from escaping from the inflow to the channel or passage F through the perforations f while it is being disturbed by the outflow of water through the perforationsf. Along near these perforations I prefer"'to provide smaller perfor-ations f2, which, or atleast the forward ones of which, are intended to be suiiiciently large to permit only a sufficient flow of Water through them to somewhat stir, or to assist in cleansing, or washing the heavier materialwith the clean water from the deflector, before it is removed from the separating surface, but not sufficiently large to permit aV strong enoughv flow of water, -to wash away the heavier material. Those of the perforations f that follow behind the perforations f in their travel with respect to the separating surface, have more particularly for their object the assisting of those traveling ahead, in supplying water to be taken up through the perforationsf and in preventing the re-lodgment or escape of heavier particles. Such lassistance is rendered through the currentof water supplied by them, which is mostly if not wholly deected toward and taken up by the perforations f The perforationsf2, that follow those f have more particularly for their object the assisting in preventing, the' 'lighter particlesof material from flowing or passing underthe partitions nearest to' them and commingling the heavier particles to be removed. This object is -effected 'by the water supplied through such perforations, `flowing under the `forming a current to wash orkeep the lighter ,particles back.

The rate of speed of rotation f the separating surface and the deilector is intended to be somewhat different, and varied to such a degree as the conditions may require, so that a part of the separating surface carrying particles of heavier material that have lodged thereont, is constantly passing under the partition, d2, and into proximity to the perforations where such heavier particles are removed or cleaned off, and the clean portion of the separating surface passes on out and around to againbe laden with heavier particles, and again cleaned offin the same way. The speed of rotation of the deflector is preferably three or four revolutions less per minute than that of the treatment vessel or separating surface, although much latitude may be'induiged in this particular, and the differential speed of rotation of these parts may be varied to such degree as will behest adapted to the material under treatment. Of course, it will be understood that while the heavier material is, in..`

this waybeingremovedor cleaned oiffrom "IOO one portion of the separating surface', matep ducedon other-,portions of the separating sur- :o5 partition, following nearest to them and thus face, where the separation is being effected and the lighter material discharged. So it. will be seen that the operation may be carried on continuously and uninterrupted, although it may be intermittent, if desired.

On the endofthe deflector nearest where the material is introduced into the vessel, I preferably provide a flange or ledge, Il, located with respect to the perforations in the deflector, so as to deflect or guide the material being introduced away from them, and away from that portion of the separating su rface that is in proximity to the perforations, and .from which the heavier-particles are being removed. Within the defiector, on its side opposite to the passage F', I have arranged a counter-balance, h, to balance the excess weight, caused in forming the channel F. On the shaft D, and adapted to be revolved with it, and Within the compartment,'F2, I` mountthewheel G. This wheel is preferably formed with a hollow central portion, or provided with channels or passages, opening at, or near its periphery, and communicating through the holes or perforation's, g, with the hollow or passage g2, in the shaft. To enable the wheel to be rotated at the desired rate of speed, I mount on the' shaft, the pulley, D',

Y which may be operated by a'belt or in other convenient way. rlhe wheel is intended to be run at a slower rate of speed than the detieetor, and, of course, the water contained within the channel in the Wheel, will be rotated, or carried around at the same rate of -speed as the wheel, which will be slower than the revolution of the Water contained in thecompartment F2, and lslower ,than most other portions of the machine,d since the centrifugal force and consequently the pressure of the water in the separator is occasioned by its rotation, andthe greater the speed of rotation, the greater the force and pressure developed, it follows that the Water 4within the wheel G, will be subjected to a less force and pressure than the water within the compartment outside of the wheel. Hence the water outside of the wheel in the compartments F2, will rush or flow into the wheel, forcing the water alreadyin the wheel toward the center, through the perforation g and through the opening g2 in the shaft, out in to the pipe e or other receptacle; as fast as Water from the compartment F2, enters the channels of the wheel, its rotary velocity will be decreased by the wheel, and consequentlyits pressure will also be deereased,so that it will at once be forced toward the center and on its way out and be discharged; of course, as the water flows from the-compartment F2, the water from the passage F will ow into it,

` and in turn the water will fiow'rapidly through the perfor-ations f', into the passage, carrying with it the heavier particles being disturbed from the separating surface by the outflow of water, through the perforations f. d

The velocity of the flow of water through the perforations f and the rapidity with which the water, are discharged, by means of the wheel G,are determined principally by the rate of speed at which the wheel is run, or the rate of differential yspeed vbetween the wheel, and deflector,the slower the Velocity of the wheel, with relation to that of the deiiector, and vessel, the more rapid willbe the current of water, and the greater will be the amount charged through them, should be about the amount taken lip-through the perforations f so that the clean water discharged by them will be that taken up and discharged with the heavier portion of the material treated; the force or speed of flow through the perforations fmay be regulated by the amount of Water, introduced into the defiector. v

Preferably around the largest diameter of the treatment vessel are provided holes or orivfices b2, for thediseharge of the lighter material and a part of the water, and atrou'gh or curbing E, is preferably arranged around these discharge holes or orifices to catch theA Water and material discharged thereat, so that it can be carriedo through one or more discharge pipes e. The material to be treated, is introduced through a pipe ,F,'which enters a hollow trunnion of the treatment vessel, and delivers the material in a finely powdered condition, and preferably mixed or diluted with'water into the receiving end of the treatment'vessel. The material and waterimmediately pass through the action of centrifugal force, tothe wall of the treatment Vessel and passes along the separating surface, toward the discharge holes or orifices b2.

.Before the operation isV commenced a suicient quantity of water is preferably introduced into the'treatment vessel and deector, to partly fill them. As the operation begins, the water in the machine assumes a position IOO to the outside, leaving a hollow space along the center, as :shown in Fig. 1.

The waterintrodueedinto the machinevdui`- ing its operation is intended to be suiiicient to maintain about the same quantity of wamoved from the machine,

| The current of Water flowing over the separating surface is intended to be maintained atsutiicient strength and rate of speed to wash off and carry away the lighter and more worthless particlesof the material, and discharge them through the orifice b2, without beingsuf fciently rapid and strong to carry off the heavier particles, which Iare allowed to lodge on the separat-ing surface of the treatment- Ater therein, or, in other ;verds,to compensate for the4 water constantly discharged or rep 1 vessel, and within -the channel 'or passagerr by other means, as above' described.

one wall of a covered channel or passage' surface, and material is being` washed or-I 6s .against the separating surface, is preferably .the holes or perforations into the passage,"

- VWhilenmveshown anddescribedthemeansf same may be-speciiie'd in the claims.` a

- tain a body of Water while in operation and -provided twith a separating surface, (means th rough' the instrumentality of jets or streams where the separation is effected, to be removed The current of Water, forced or driven through the holes, or perforations f, and

intended to be sufficiently strong and violent to disturb and bring into-'a state of suspenfv sion the particles of the heavier material that have lodged on the separating surface, and brought into proximity to such perforations, through the differential 'speed of rotation of the separating surface and the defiector, or" other equivalent means, while, at the same:i time, the dow, or current of water' through F,-operating like a'suction, so to speak, isfl intendedto'be, sucieritly rapid and strong to carrywith it vthe particles of heavier-mate-' rial disturbed from-the separating surfaceby theforce of the water, from thep'erforationsf f, whence it'isearriedwiith the .water through 'if the passage .1F,'int-o the compartment F2, andf forced'thronglhsthe 'opening in the Wheel -G,=' and through the perforatons and the'hollow in that end o'f -the= shaft fD, Where 'it4 is' dis#f charged in a pip'eor-"conduit'e', to 'adesired receptacle as has been herein described.

What I regard as new, and desire to secure 1.` In a centrifugal ore separator, the com-g bination-'sof a rotatablvessel adapted to con-` of water for removing heavier material from one portion of such surface while thelig'hter material 'is being separated .and discharged from another portion thereofhsubstantially 2. In a centrifugal ore separator, the vcom-L bination'of 'a rotatable vessel adapted to con-l tain a'body of -water r,While in operation 'and' provided with aseparating surface, forming means for removing .heavier material from one portion of the separating surface, and' discharging it at the axis of rotation while at-the same time the separation is vbeing effected on another portion of the Vseparating cleansed upon still another portion of such` 'stantially as described surface, substantially as described.

ln a centrifugal ore separator, the com-- binationof a rotatable vessel adapted to con-Y tain'a bodyof 'water While 'in operation 'and "provided Awith-a separating surface,` vand means, rotatable independently of these'parating surface, for removing the heavier-ma,

terial from'one portion' of'such surface :while the separation 'of-thelighter -is being e'ected upon another. portion thereof, substantially as described. A

4. VIn aeent'rifugal ore separator, theconn bination of a rotatable vessel vadapted to con -tain'a body ofwaterwhile in operation and provided with a separating surface, means sdf for remov-ing'h'e'avier niaterial'from one portion of the separating'snrface whleethe separation' of lighter 'material is being effected' on another portion thereof, and mea-ns for'preventing the lighter 'material from 'being deposited on that portion of -thejseparati'n'g s'u'r- -face from which the heavier material is being removed, 'substantially as described.l

5'. `Inacentrifugal'ore separator, the-'coml' Ybination of'a rotatable vessel' 'adapted-'to contain a bod-y' of water while inA operationund provided with la separating surface, forming ione 'Wall "of a covered channel"orp'assage means -for removing heavier material'from one portion of "theseparating-surface and discharging it ,at the 'axis of `rdtation while the sepanation of 'the lighter'fmaterial'is oeing eect-edon another porto'nithe'reof, 'and mea'ns'for preventing'theeseapeof the heavier materialf-rom'that portion of the separating surface 'from vwhich it is being removed, sti-b- 6. In a centrifugal orev separator the, 'combination of a rotatable vesselfadaptedito com tain-a body of lWater while iu operation,l and provided with a separatingy surfacefm'eans for removing -heavier material from oneporflos tion of the separating surfaoejwhile sepaation'of lthe lighter material is being effected `on, another portion thereof, and means for 'preventing the lighter,v material from being deposited on .that portion'of'the separating .IIC

surface from which 'the heavier `material is being removed, traveling with re'spectto'the separating surface, substantially asdescribed.

7. In a centrifugal oreseparator,fthe combination of arotatable vessel 'adapted tocontaina 'body of Y water while in operation and provided with a separating surface, means I for removing .heavier 'material from one portion of the separating surface'while the sepa? ration ofthe lighter material is being effected 'si i' on another portion thereof, and traveling'partitions between vthat portion of lthe separat- 'ing surface upon which the lighter material is being separated, and that portion from substantially as described.

' 8. 'Ina7 centrifugal ore separator, the combination of a rotatable vessel adapted'to contain a body of water while iu operation and provided with aseparating surface, forming one' wall of a covered channel o'r passage` means for removing heavier material from which the heavier material is being removed, f

from one portion of such surface and disand discharging it at the axis of rotation while bination of a rotatable vessel adapted to confor deflectin g and guiding m aterial'along near,

- for deliecting and guiding material alon g near, or in yproximity. to

.lighter is being separated' from another por `bination of a rotatable vessel adapted to concharging it at the axis of rotation While the lighter material is being separated andv discharged from another' portion thereof, substantially as described.

10. In a centrifugal ore separator,'thecom bination of a rotatable vessel adapted tocontain a body of Water while in operation and provided with ay scparatingsurface, means for deilecting and guiding material along near orin proximity to the separating surface, rotatable independentlyvv of such surface, and means for removing .the heavier material from one portion of the separating surface,"

the lighter material is being separated on an. other portion thereof, 'substantially as de-y scribe v 11. In a centrifugal ore separator, the comtain a body of water. while in' operation and provided with a separating surface, means for deilecting and guiding material along near or 'in proximity to the* separating surface, means through the instrumentalityof jetsor streams ofwater for stirring or disturbing material on the separating surface, and means for :removing the heavier material from one portin of the separating surface While the tion thereof, substantially as described. 12. In a centrifugal ore separator, the com'- bination of a rotatable vessel, adapted to contain a body of water while in operation and provided with a separating-surface, mean's` or in proximity to the separating surface, and means rotatable independently of the separating surface for `removing the heavier material from one portion of such surface, while the lighter material. is'y beingv separated, and discharged fromanother portion thereof, substantially as described.

13.- Ina centrifugal ore'separator, thecomtain a body of water while in operation and provided with a separating' surface', means the separating surface, means for 'removing heavier "material from on portion'of the separating surface, while the lighter material is being separated and discharged from'another portion thereof, and.

means for preventing the lighter materialv from being deposited on that portion of the separating surface from which the heavier material is being removed, substantially as described. l-

14. In a centrifugal ore separator, the cornbination of .a rotatable vessel adapted to contain a body of water while in operation and provided with a separating surface, means for deliecting and guiding materialalong near, or in proximity tothe separating surface, means for removing heavier material from 'one portion of such surface While the lighter material is being separated and discharged from another portion thereof, and means traveling with respect to such surface for preventing the escape of the heavier material from that portion of the separating surface from which it is ybeing removed, substantially asdescribed.

15,. In a centrifugal ore separator, the coinbination of a rotatable vessel, adapted to contain abody of v water While in operation and provided with a separating surface, means for deflecting `a-nd guiding Jnaterial along near, or in proximity to the separating surface, means for removing the heavier material from one portion of such separating surface while lighter. material is being separated and discharged fromfanother portion thereof,

and traveling partitions between that portion of the separating surface upon which the' lighter material is .being separated, and that portion from which the' heavier material 1s.

.being removed, substantially as described.

.16.-A In the centrifugal ore separator, the A combinationof a rotatable'vessel adapted to contain a body of Water while in operation and provided wit-h a separating surface, means fory deflectin'g and guiding material along near, or in proximity to the separating surface, means through the instrumentality' of jets or streams of water for removing heavier-'materialfrom one portion of the separating surface, While lighter material is' being separated upon another portion of such surface, and means for detaching or disturb-v ing the heavier material from the separating surface, substantially as described.r

17. In a centrifugal ore separator, the combination of tw'o rotatable cylinders, one within the other, with a channel or passage be-- tween them, a separating surface forming one wall of such channel or passage, and means through'the instrumentality of jets or streams of waterfor-removing the heaviermaterial from bne portionV of the separating surface while the yseparation and removal of the lighter material are being effected on another portion thereof, substantially as described.

`18. In a centrifugal ore separator, the combination of twocylinders, 'rotatable independently with respect to each other, one 1ocated within the other, with a channel or passage between them, a separating "surface forming one wall of suchchannel or passage,

and means for removing the heavier material from one portion of the separatlng surfacewhile the separation of the material is being effected on another portion thereof, substantially as described.

19. In a centrifugal ore separator, the com-v bination of two cone shaped cylinders or ves sels rotatable independently with respect to each other, one located within the other, with a channel or passage between them, a separating surface forming one wall of such chant nel-or passage, and means for removing 'the heavier material from one portion of the separating surface while the separation is-being effected on another portion thereof, substantially as described. i

20. In a centrifugal ore separator, the'coinbination of two rotatable cylinders, one within the other, with a channel orpassage between them, a separatingsurface forming one wall of such channel orl passage, Vmeans for introducing water into the4 inner cylinder, the inner cylinder provided with perforations through its wall, whereby water is projected or sprayed against the separating surface or material thereon, and a rotatable wheell for moving heavier material from one portion of the separating surface, while the separationis being effected on another portion thereof substantially as described.

21. In a centrifugal ore separator, the com-4 bination of two rotatable cylinders one within the other, with a channel or passage between them, and a separating surface forming one wall of such channel or passage, means for introducingr -water into the inner cylinder, and means through perforations in said inner cylinder for removing the heavier material from one portion of the separating surface, while the separation is being effected on another portion thereof, substantially as` described,

22. In a centrifugal ore separator, the combination of two rotatable cylinders, one within the other, with achannel or passage between them, and with `a separating surface forming one Wall of such channel or passage, meanswithin the inner cylinder communicating with a compartment within the separator,the covered channel or passage provided with perforations through which the heavier material is collected from the separating surface, and means for removing and discharging water and heavier material from the compartment, substantially as described.

discharged from the 24. In a centrifugal oreseparator, the coin-y lbination of two rotatable cylinders, one within 4is collected .from the separating surface,l and a wheel provided with channels orpassages therein, communicating with alicllow shaft, and' adapted to be rotated within the compartment, whereby heavier material and water are removed fromthe separating surfaeeand separator, substantially as described. 1 y

25. In a centrifugal ore separator, the coinbination of two rotatable cylinders, one within the other, and having a space between them a covered channel or passage within the inner cylinder communicating with a I compartment withinthe separator, and prolvidedl with holes or perforations communieating with said space, between the cylinders, means for disturbing the heavier material on the separating surface, and means for removing water and material from `the compartment and discharging them from the sepai'ator, substantially as described.

26. In a centrifugal ore separator,tlie combinationpiof t-wo rotatable cylinders, one within the other, with a channel or passage between them a covered channel or passage within the inner cylinder, communicating with acompartment within the separator, and provided with holes or perforations communicatin g with -said covered channel or passage between the` cylinders, means for disturbing the heavierv material from the separating surface, and awlieel adapted to rotate within ICC the coinpartmennand provided with cliant nels or passages communicating with the compartment, whereby water and heavier ina terial are discharged from the separator, substantially as described.

27. In a centrifugal ore separator, the combination of two rotatable cylinders, one within the other with a channel or passage between thern,aseparating surface forming-one wall of such channel o'r passage, a covered i channel or passage within the inner cylinder communicating with a compartment in the separator, `the cov-ered channel -oi' 'passages provided with holes or perforations eoniinu'- nicating with the channel or passage between IIO the cylinders, means 'for removing heaviery and water are removed from the separating surface and discharged from the separator, substantially as described.

I29. In a centrifugal ore separator, the com? 5' bination of two rotatable cylinders, one within the other, with a channel or passage between tl1em',a separating surface forming one wall of such channel or passage, a covered channel or passage within the inner cylinder communicating with a compartment within the separator, the covered channel or passage provided with holes or perforations for the passage of water and heavier material th'erein, the inner cylinder provided with holes or perforations for the escape of water therefrom, means for introducing water into the inner cylinder, and means for removing Water vand heavier material from the compartment and discharging them from the separator, substantially as described.

30.l In a centrifugal oreseparator the combination of a rotatable vessel provided with a separating surface and adapted tocontain oRRIN B; PECK'. Witnesses:

R. S. HALL, R. G. HUDSON.'

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