US1056923A - Hydraulic concentrator. - Google Patents

Description

F. E. MARGY.

HYDRAULIC CONGENTRATOR. APPLIUATION H LBD JUNE 12, 1912.

1,056,923, Patented Mar. 25, 1913.

3 SHEETS-SHEET 1.

WITNES'SES:

4 TTORNEK WL: LMI

F. E. MARGY.

HYDRAULIC CONGENTRATOR.

APPLIUATION FILED JUNE12, 1912.

Patented Mar. 25, 1913.

3 sHETs-SHEET 2.

WITNESSES:

A TTORNEY.

F. E. MARGY.

HYDRAULIC GONCENTRATOR.

APPLICATION FILED JUNE 12, 1912.

1 1,056,923 Patented 11311211913.

3 SHEETS-SHEET 3.

WITNESSES: LVVENTOR.

A TTORNE Y.

citizen of the United States, residin 'Fig. 2 is'a top plan thereof FRANK E. MARCY, 0F SALT LAKE CITY, UTAH.

l HYDRAULIC CON CENCLRA'IOIK".

- vSpecleat'ion of Letterslfatent. Application le'd J'une 12, 1912. Serial No. 703,228.

Patented Mar.25,191a.

To all w/Lom t may) concern.' i

Be it known that I4, FRANK E. MARCY, at Salt Lake City, in the county` of Salt ake and State of Utah, .have invented certain new and useful Improvements inHydraulic.

Concentrators, of which the .following is ar full, clear, and exact description, reference being had to the accompanying drawings, formin a part hereof.

My invention has relation to improvements in hydraulic .concentrators;. and it consists in the novel details of construction more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1 is a side elevation of the machine 'in feeding position; with parts in section on the line 2 2 ofFig. 1, and with parts broken away; Fig.A 3 is a rear end view of the concentrator in feeding position with parts broken away; Fig. 1 is a vertical cross-section on the line /1-4 of Fig. 1; Fig. 5 isa rear end View of the concentrator in its dressing position, parts being broken away; Fig. 6 is a rear-end view thereof in its washing position; Fig. 7 is an enlarged vertical cross-section on the line 7-7 of Fig. 1; Fig. 8 is a longitudinal sectional view taken through the bearing of the trunnion adjacent the crank-shaft, showin `the manner of mounting said trunnion; ig. 9 is a similar sectional view of the bearing of the opposite or hollow trunnion showin the manner of feeding the dressing an wash water to the tables, the osition o f the parts corresponding to'the pu p-feeding position of the tables;Fi 10 1s a cross-section on line 10--10 of ig. 9; Fig. 11 is a similar section showing the trunnion turned however to dressing position; and Fig. 12 isv a digrammatic view showing the manner of operation of the guide or bar by which the' feed-area of the deck or table is restricted, and how said area is enlarged for the dressing and washing operations.

The object' of my invention' is to construct a hydraulic concentrator to the .separating surface of which is preferably 1in- ,parted a horizontally reciprocating movement whereby a complete stratification between the concentrates and lighter gangue vand sands may be eHected, the concentrates adhering to the separating surface and the lighter materials resting upon the heavier.

A further object is to construct a machine wherein the stratified material automati- -cally classifies itself accordingto the gravity of its components, the classification having the effect of grading the materials in an order conforming to the general direction of flow of the pulp sheet over thedeck or separating surface of the concentrator.

Since-in such flow thel lighter particles are are dressed and washed by2 streams of water directed transversely to the normal flow of the pulp, such transverse flow being eminent-ly desirable since the dressing, and

lwashing of the concentrates is attended with a minimum Waste of water.

By the classification the separating surface is divided into distinct transverse zonesof deposit, from each of which zones the gangue may be washed off or dressed, by carefully regulating the intensity and quantity of the stream of Water necessaryl to accomplish the purpose. -By reason o'fthe classification less water would be necessary for example to dress the concentrates at a point removed from the pulp feed, than at a point near the pulp-feed, because at the farthest points the finer and lighter gangue would accumulate, the heavier particles tending to (firo) out and separate at points near the ee v The advantages of the invention will be apparent from a detailedl description thereof which is as follows Referring ,to the drawings, 1 represents a trough receiving the pulp from the pu1psupply pipe 2. slhe pulp is distributed from the trough 1 by means of tubes or nozzles 3, 4, res ctively, onto the separating surfaces S of t e tables or decks d, d', entering in the construction and forming part of, the tilting frame F, the trunnions t, t, of which are loosely supported in the standards 5, 5. The se arating or'catching surfaces S may be of rubber (as-shown) or of canvas, wood, cement, or other suitable material well known inthe art. The present frame while specifically showing two superpoeed decks d, d', may be equipped with one', two or more dec s, any single deck constituting a concent-rater in itself, and being independent of 11 that. with a rotation of the crank-shaft a horizontal reciprocating or shaking motion is imparted to the frame F, and hence to the decks or tables d, d', the separating surfaces o f which preferably (though not necessarily) have a slight dip from the source of p u p supply or trough 1 (Fig.- 1). The re-y clprocating movement here re rred to is not however indispensable, and its presence in all cases is not necessary because with a 'silent or non-reciprocating table, stratificaioxewould take place at the dressin period as indicated by the arrow in Fig. 2, over a prescribed section of the -total area of the deck, said section being included between the side marginal flange 9 of the deck and a longitudinally disposed guide or cylindrical bar 10 parallel thereto and removed a suitable distance from theadjacent lon tudinal free edgel e of the' deck. The gulde 10 is mounted to rock about an eccentric axis and operates on the principle of a cam, the ends of the guide being .supported in the terminal walls ofthe frameF below'the vlu s or brackets 11., 11, (Fig. 3), the lugs an said frame walls being rovlded with pins 12 against which is a apted to Aimpin e the weighted arm lsecured to each gui` e, the we1ght W at the end of the arm oscillating the arm first in one direction and then the other, depending on the degree of lateral oscillationlor tilt imparted to the. frame F about its trunnions t, t', the pins 12 arresting the arm and confining its oscillations' (and hence the rotations of the guide l10) to certain limits. Being thus eccentrically mounted, the periphery of the guide 10, whlch for a horizontal position ofthe frame F engages the separating surface of its correspondmg deck (Fig. 12) will rock away or be dlsengagedfrom, said separating surface, thereby leavinga free passage-way h be'- tween it and the guide, when the frame has been suxiiciently tilted to cause the lever arm dischargin 13 to `swing in proper direction to rock the guide to such disengagingposition (Fig. 5). The tilting of the frame about the axis of the trunnions t, t', will be more fully hereinafter entered into.'

Disposed contiguous to the sideiange 9 of each deckor table isa spray-pi e 14 pro vided with valve-controlled nozz es 15 for dressing water and water for washing ov the concentrates at the conclusion of the, operation of stratification and classication. The pipes 14 are supplied presently described. The pu p Hows.

with water (at the proper time) from a supply pipe p. connected to the standard 5, the trunnion t' bein hollow. (Fig. 9 and operating in a bus ing 16 (provi ed with a packing ring 16') with the peri heral port o of which the discharge termina of the pipe p is in constant communication. The peri heral wall of the trunnion t' is provided with a port o which, when the frame F 1s tilted to a proper angle (the dressing angle) from its normally horizontal position (Fig. 11), is brought into register with the port o and the waterfrom the pipe p rushes mto the trunnion, whence it flows through the branches 17 to the pipes 14 and their nozzles 15. Until the frame has been tilted through a sufficient' angle, .the ports 0, o' remain out of `register (Figs. 9 and 10) so that the rethe frame may go on without ciprocatlon of the possibility of water discharging over the decks from'the nozzles 15, and interfering with the pulp sheet directed thereover, or with the stratification and classification of the pulp while pursuing. the` course of its normal flow. The ports 0, o', are so proportionedthat no matter at what portion of a stroke (ot` its reciprocation) the frame F may be stopped preparatory to the tiltin thereof to secure a register between sai ports, the port o will always come well within the port o' toA secure the full volume of water therethrough not only for an inclination of the frame which corresponds to the dressing period, but for an inclination which corresponds to the concentrate washing period, as will more fully hereinafter appear.

The tilting of the frame F (with its decks d, d' for purposes of dressing and washing may be accomplished by suitable gearing, 105 rotation of the crank-shaft 6 being stopped for the time being by shifting the driving belt B from the fast pulley. P to the loose pulley P' thereof as well understood in the art. One form of the tilting gear is shown ,iny the drawings, and is substantially as follows The trunnion t is provided with a key 18 (Fig. 8) operating freely through a key-way or groove 19 in a bushing 20 secured to a gear wheel 21 and passing `loosely 115 through the standard 5, a terminal ring 20 secured to the bushin preventing displace. ment of the latter in one direction) as shown in Fig. 8. By thisjarrangement theV trunnion t is free to reciprocate within the bushing and through the gear-wheel 21 during the reciprocations of the frame F, and when the frame is stopped, rotation of the gear 21 will obviously impart rotation to the trunnion v' (being` keyed thereto) and hence 1%` the frame remains at rest while said section (b) is opposite the gear. The action of the section a is to turn the Wheel 21 suiiiciently to cause the frame F to rock to dressing position, the tables assuming an angle of about twenty-tive degrees (more or less) to the horizontal, as shown in Fig. 5, the section c rocking the frame to cause the tables to as-v sume substantiallya vertical osition (Fig. 6), at which they remain unti the frame is released and allowed to resume its horizontal osition. The frame (Whatever be the ang e to which it is tilted) is locked against wheel, When the dog28 a return movement by a spring-controlled ielding in one direction by the bending o the Hexed. spring 26, but limited in the opposite direction by an abutment 27) the'terminal laterally deflected linger 25 of which engages the teeth of the gear wheel 21; but when the pawl is oscillated out of engagement with the said dotted position of the paw in Fig. 4) the frame returns automatically to lits. horizontal position under the action of the counterweight R. This return to horizont-al position is accomplished while the pawl is displaced (forced from engagement with the gear 21) by the ca'm `or dog 28 carried by the wheel'22 at an appropriate distance beyond the end of the toothed section e of said bevel face of thelug 25 of the pawl (which it traverses in effecting displacement of the pawl) the latter ren ages the gear wheel 21, by whichtime the graine has resumed its horizontal position. In rotating back to such horizontal position under the action of the weight R, the frame settles down on a spring-buffer Y of any approved const-ruction, such buffer eliminating any jars, and serving in a vmeasure to support the frame and thus relieve the locking pawl 25 of a,

portion of the Aweight of the frame. In resuming its horizontal position under the action of the weight R, the rotation-of the frame causes the weighted arm 13 to oscil-l lateback to its original position (from which it had swung with the tilting of the frame and in Whic it `rocked the guide 10 outy of Contact with the separating surface) thereby rotating the guide 10 back into contact with the separating surface, destroying the passage k, and confining the next lot of pulp between the side fiange 9 as described.

During the tilting of the `frame to bring its decks to dressing and washing positions, the pulp-feed i's-automatical'ly cut off by the closing of a spring-controlled self-closing rock-valve Vy of any conventional t pe mounted on the pipe 2, and held open `uring the feeding period by a tappet or pin 29 ar wheel, (see `has passed off theA flow ofthe guide and the' at the free end of an arm 30 carried by the frame, said tappet engaging -or bearing against, the lever arm 31 of thevalve-spindle 32 during said feeding period. So long as the frame remains in its horizontal position, the tappet 29 will bear against the lever arm 31 and hold the valve open; as the arm 30 recedes from the member 31 with the tilting of the frame to dressing position, the release of the member 31 will permit the valve to close automatically as clearly obvious from the drawings. As the frame tilts to its washing or vertical position the valve still remains open (the lever-arm 31 having a certain limit of oscillation). As the frame returns to its original horizontal position the tappet 29l will strike or rengage the leverarm 31 and thus rock the valve V back to open 'or' feed position.

L represents a launder for the tailings flowing over the free transverse edges of the vdecks d, d; L a launder compartment for the gangue or middlings resulting from the dressing operation and flowing over the side edges e of the decks; and L a launder compartment for the concentrates washed oli uring the washing period.

. The operation of the concentrator will now be clearly obvious and is substantially as follows Let us assume that rotation' has been imparted to the crank-shaft 6 so that a horizontal reciprocation is imparted to the frame F and hence to the separating surfaces'of the decks a?, d', thereof, the pulp being allowed to discharge from the pipe 2 into the trough 1 whence it flows or feeds Onto the decks "through the nozzles 3, 4, as described. Stratification andclassifcation of the material will now take place over the surfaces S, the heavy concentrates being at the bottomand the lighter gangue and .sands on top, the two superposed layers grading or classifyin themselves progressively along the sur aces S into distinct zones separated by dividing lines 'w disposed across the decks (Fig. 2) as previously pointed out. We can assume that a constant rotation is imparted to the tilt- ing gearing 21, 22, andthat the period of reciprocation of the frame .is confined to the period of inaction of the said gears (21, 22), that .is 'to say, to the period that the plain por tion a of the periphery of the wheel 22 between the dog 28 and the toothed section a is rotatin opposite the gear 21, this being the .period during which the' frame F remains in its horizontal position after beingv allowed to return to said position by the dog 28 releasing the pawl 25 from the gear 21. The moment the section a of the wheel however, engages the teeth of the `.wheel 21, the reciprocating movement of the frame is stopped by stopping rotation of the crankshaft. As illustrated, the stopping of the crank-shaft at this juncture must be done sus las

described,

iclosed or cut oif shift from the tight pulley P tothe loose pulley P automatically, and thus stop the crank-shafts rot-ation. The section a now 'tiltsthe frame and hence the decks d, d',

to dressing position (Fig. 5), the gear 21 being keyed to the trunnion t as previously and hence permitting suchaction, in which rotation of the frame the pin or tapggt 29 leaves the valve lever 31, the valve automatically rocking to its position (see dotted position of parts in Fig. 4). At the same time the port o will be rocked into register with the port o (Fig. 11) and dressing water will immediatelyrush into the spray pipes 14 and nozzles l5 onto the ,decks d, d', the streams lowin over the stratified' and classified material b 'eing regulated by the cocks or valves/v with which the nozzles 15 are provided. In thus tilting to the dressing an le the frame F causes the eccentric or gui e 10 to rock away from the surface S leaving between it and said surface a clear passage-way h (see dot-ted position Fig. 12) for the washed material which thus flows over the edge e into the launder L. -The provision of the guide 10 :is important, as it prevents any loss of concentrates duriiig the dressing operation, the said concentrates'adhering to that section of the area of the surface S included between the guide andoverfiow edge e of the deck, while the'light gangue' is carried over said edge. Were it not for the guide, which restricts the original pulp-flow to a prescribed section of the entire 4area of the deck, the concentrates would be in danger of being washed oi the deck in the dressing operation, whereas they are now caught byv that section of the deck surface between the guide and edge e. The dressing continues, and the frame is locked by the pawl 25 to the dressing angle, while the plain section b 'of the gear 22 is advancing opposite the gear 2l. As the gear 22 continues to revolvc the section a 'next advances the gear 21 causing it to .turn suiiiciently to rock the frame to bring the decks d. d, thereof to vertical position (Fig. 6) the port-s 0, o', still however remaining suiiciently in register as not to interfere with the free deliv- ,ery of water to the nozzles 15. The transverse streams of water now .wash the concentrates adhering to the separating surfaces, into the launder compartment L, the washing continuing until, the dog`28 has released t e gear 2L, the weight R the decks thereof to horizontal 'position while the do is passing over the bevel edge of the lug 5 of. the pawl. The frame having resumed its horizontal positio ro- .05 tation is restored to the crank-shaft which l restore it to its first position,

opening however, extends will again impart a horizontal reci rocation to the frame during the peri that the lain portions of the gear 22 between the og and the toothed section a is passing the gearwheel 21. Thus a complete cycle has taken place, and this cycle is repeated as often as necessary. As the frame F rocks from the dressin to washing position, the tappet 29 leaves t e valve-arm 31 which has reached the limit of its sweep by the closing of the valve V, but on the return .of the frame to its horizontal feed or A,stratiiying position, ren'gage said valve arm'and oscillate and vthus again the valve V and releasing the pulp into the trough 1. At the. same time the ports o, o are brought out of register and thedressin and wash water is automatically cut o The tailings from the pulp during the stratifying and classifying operation are caught in thelaunder L; the middlings are caught in the launder L; and the concentrates in thefl'aunder L as already described. i v

Owing to the presence 'of the trough one end of the n per deck das its spindle mounted preferably in the strip m which forms, the support for the inner edge of the bottom of the trough (Fig. 1)\.. The lower guide 10 the full length of the. frame F having its eccentric spindles mount-` ed between the end walls of said frame.

The specific arrangement of superposed decks here shown need not of course be adhered to, a complete duplicate machine, that is to say two decks in substantially the same plane fastened to a sin any combination of dec spirit of my invention.

Having described my invention, claim is z- 1'. In combination with a member having a substantially plane reci rocatin separating surface for the distri ution o4 the concentratesin sheet form, means for feeding pulp over said surface in a direction substantially parallel to the plane of reciprocation thereof whereby the material is raded in the line .of fiow of the pulp, means or directing streams of Water transversely to the line ofpulp iiowfpfor dressing, and subsequently washing oli the concentrates in theirgraded distribution, and means for cuts, falling within the the said tappetl will strike or l ide l10 identied with the uple frame, orv in fact what' I t ting off the How of pulp during the dressing tion and a apted to grade the material in` sheet .form in the general line of iow, means for tilting said sur-faceabout an axis suba member prestantially parallel to the line of flow, means for directing dressing streams across the A 'with a guide resting on the surface thereof graded material transversely to said axis, and means for cutting oil'l the pulp flow during the dressing operation.

In an ore concentrator, a member pre- -senting'a separating surface for the flovv of pulp thereover in a given direction andthe grading of said pulp in sheet form in the general line of flow, means for tilting said surface about an axis substantially parallel to the line of flow and bringing the same intoa plane disposed at an angle to the plane of pulp-flow, means forl directing across said surface streams for purposes of dressing at one angle, and streams for washing the concentrates at a higher angle and discharging the same, in their graded distribution, and means for cutting ott the ulp ilow during the dressing and wasliing periods. v

4. In a concentrator, a member provided during the flow of pulp thereover, and disposed' parallel tothe general direction of the pul -low, means for tilting said member, an means for raising said guide oil" said surface with the tilting of the latter to a dressing plane.

5. IvIn a concentrator, a member having a separating surface traversable by a pulpflow in a given direction in a given plane whereby the material is raded in the general line of flow, means or cutting off the nlp-flow, means for tilting the member to ring its surface in -a plane inclined to the plane of pulpdlow, and discharging dressing Water across the graded material during the period of cut-oit' of the pulp, means for regulating the force of the dressing currents over different portions of the separatin surface accordin to the grades thereon, an

means for disc arging the material in.

graded distribution.

f6. An ore concentrator provided with a separatingl surface disposed in a plane permitting t e flow of pulp thereover in a given direction -means for cutting ofi' the pulp-flow and tilting the surface at an angle to the* original plane of iow for purposes of dressing, and at a `higher angle for pur- .poses of removin concentrates, the mate- -rial grading itsel in its flow-over the sur face into zones progressin `in the general .line of flow, and means for irecting streams 'of water for dressiii and Washing across :the several zones an discharging the concentrates in their' graded distribution dur- -iii lthe period of cut-off lof the pulpfow.

A concentrator having a member tiltable about an axis and having as ubstantially plane separating surface adapted to be rought into distinct planes -for concentration, dressing and Washin of concentrates,v 'means for feeding the pup over said surfface -iii a direction substantially arallel to said axis whereby the material Abecomes graded on said surfacein the general line vgraded in the general line of flow, means for cutting off said flow, means for tilting said member in a plane transverse' to the normal direction of flow of the pulp, and means for directing streams of dressing Water during said period of cut-oil` over said tilted surface transversely to the normal direction of pulp flow for preserving the graded con-v dition of the material perparatory to washing. 9. In an ore concentrator, a member rovided with a separating surface for the ow of pulp thereover in a given direction whereby the same becomes graded in the vgeneral line of flow, means for cutting oitI the flow, means for tilting said surface transverselyy to the direction of the pulp-flow and at an angle to the plane of pulp-flow and means for directing across the same, during theA period of cut-off, streams of Water for purposes of dressing at one angle, and streams for Washing the concentrates at a higher angle and discharging the same 1n their graded distribution.

(10. In a concentrator, ya tilting member provided with a separating surface for the concentrates, means for causing a flow of pulp in a given direction over said surface, means disposed along the -pulp stream and engaging the separating surfacefor restrict ing the aforesaid flow to a certain portion of said surface, means forcutting off the plup flow, means for directing streams of Water over the surface transversely to the normal direction of flow ofthe pulp during the period of pulp cut-ol", and vmeans for removing said area-restricting member from the concentrating surface to expose the entire area of said surface to said transversely directed Water currents.

11. In a concentrator a member provided with a substantially plane separating surface, means'for directing a flow of pulp in a given direction over a ortion of said surface wherebythe material becomes graded on said portion in the general line of flow, means for cutting ofi' the vpulp-flow, and means for directing currents of water over the entire separating surface in a direction transverse to the normal direction of pul f flow during thev eriod of cut-off of the pu p for dressing, an means for discharging the concentrates in their graded distribution.

12. In combination with a 'member havying asubstantially planeseparatng surace over which the pulp isfree to flow ina ygiven direction and be graded in the gen-A teral line offlow, said member beingrotatable about an axis parallel to the enei'al direction ofthe pulp-flow, means or cutting off the pulp, and directing streams of water over said surface across the path of pulp-flow for a tilted position of the memmaterial.

- of, pulp suppl er during the period of cut-off, for dressing at one angle, and washing and discharging ,the concentrates in their graded distribution at a higher angle.

13. In combination witha member having a separating surface over which the pulp is caused to ow in a given direction whereb the same is-,caused to stratify, and

, grade into zones separated by lines of division .transverse to the direction of pulp low, means for cuttingofi' said pulp, means for tiltin the member about an axis arallel to t e general direction of pulp'- ow and bringing its separating surface into a plane disposed at an angle to thel plane of pulp dow, and means for directin streams of water across the zones of classi cation in .paths substantially transverse to the axis of the zones and discharging the concentrates` in their graded distribution, and'means for regulating the force of the water currents according to the character `of the graded 15. In combination with a suitable source a rotatable member having a substantial y plane separating surface over which the pulp is free to flow and lbecome graded in a general direction parallel to the rotation axis of said member, means for tilting themember about said axis to bring the separating surface in a lane inclined to the plane of iow of t e pulp, means for cutting off the pulp', means for e directin streams of dressing Water over the materia deposited on the lseparating surface during the period of cut-off of the pulp in a directiontransverse to the` rotation axis of the member, and means for discharging theJ concentrates .in their graded distribution.

16. In combination with a suitable source of pulp supply, a rotatable member having a separating surface over which the pulp is free to flow and become graded-in a general direction parallel tothe rotation axis of said member, means for tilting the member about said axis to bring theplane of the separating surface to Aa predetermined in means for Locaties cline to the plane of flow of the pulp, means for cutting off the pulp to said surface, directing during the period of cut-off of the pulp, streams of waterover the material deposited on the separating surface in a direction transverse to therotat-ion axis of the member, means for tilting the member to bring the plane of its separating surface to a greater incline to the plane of ow of the pulp, and continuin the transversestreams of water aforesaid over-the surface to wash and discharge` the concentrates in their graded distribution.

17. In combination with a suitable source of pulpsupply, a rotatable member having a substantially plane separating surface over which the-pulp is free to iiow and become graded in a general direction parallel to the rotation axis of said member, means for tilting the`\lmember about said axis to bring the separating surface in a plane inclined transversely to the plane of .flow of the pulp, means for automatically cutting the the pulp, means for directing streams of dressing water over the material deposited, on the surface in a direction transverse to the rotation axis of the member during the period of cut-oi of the pulp, and means for discharging the concentrates in their graded 95,

distribution.

`18. In combination with a suitable source of pulp supply, a rotatable member having a substantially plane separating surface over which the pulp is free to How. and be-4 come graded in a general direction parallel to said axis,' means for reciprocating saidmember parallel to said axis, ingd-he member about said axis to bring the separating surface in a plane inclined trans-i versely to the plane of flow ofthe pulp, means for cutting ofi' the pulp to said surface, means for directing streams of dressing water over the surface across said axis after the pulp flow has been cut oi, and means for. discharging the gangue and sands and concentrates in their graded distribution.

19. In combination with a tilting member lfiavin a substantially plane separating surace nlp thereover in' a given direction wherey the same becomes graded over said surface, means for cutting ot the pulp-flow, means for directing streams of dressing water over the graded material in stantially parallel to the lines of division between the grades, and discharging the concentrates in their graded distribution.

20. In an ore concentrator',` a member re--125 supply, meansfor tilting said surface in a-l130l means for tiltor concentrates, means for feeding-,.115

and means 4for washing i plane transverse to said pulp-fiow and to distinct angles, and means for directing streams of water across said' surface while at said angles for respectively washing and discharging the sands and concentrates in their graded distribution.

E21. ln an ore concentrator, a member presenting 'a substantially plane separating surface for the flow of pulp thereover in a given direction whereby the pulp becomes graded thcreover in the general line of How, means for cutting oit1 the flow, means for tilting said surface during the period of cut-oil ofV the pulp in a plane' transverse to the direction lof pulp-How and at an angle Ato the plane of pulp-flow, means for directingr across the tilted surface at an angle to the line of flow of the pulp thereover, streams for dressing the graded material, and means for washing and discharging the concentrates in their graded distribution.

22. ln combination with a tiltable member provided with a substantially plane separating surface, means for producing a flow of pulp thereover in a given direction whereby the material is graded in the line of How,-

means for tilting the member, means for Washing the material transversely of said How on said member while tilted, and means for discharging thek concentrates in their graded distribution.

Q3. In combination with a member tiltable about a fixed axis and provided with a substantially plane separating surface, means for producing a loW or pulp thereover in a direction substantially parallel to saidaxis whereby the material is graded in the line of flow, means for cutting off the flow and washing the material transversely of said flow for a tilted position of the member and maintaining the separation between the grades. and means for discharging the concentrates' in their graded distribution.

Q4. In an ore concentrator, a' member presenting a substantially plane separating surface for the ilow or pulp thereover in a. given direction and the grading of said pulp in sheet form .in the general line of tlow. means for tilting said surface. about an axis substantially parallel to the line of flow, into a plane disposed at an angle to the plane of pulp-flow, and means for directingr across the same dressing streams for the purpose of dressing the pulp, and means for washing away the concentrates from said' surface.

25. In combination vwith a tiltable member provided with a substantially planeseparating surface, means for producing a flow of pulp thereover in a given direction whereby the material is graded in sheet form .in the general line of How, means for tilting said member about an axis substant-iall)r parallel to the/line of tiow, and means for washing the material transversely of said axis while said member is tilted, and directing the streams4 thereover to preserve the concentrates in their graded distribution.

In testimony whereof I aiiix my signature, in presence of two witnesses.

AFRANK E. MARCY.

- 'itnesses H. I. GooDsPEED, O. H. JoHNsoN.

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