US2678727A - Separating solid materials by suspension - Google Patents

Separating solid materials by suspension Download PDF

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US2678727A
US2678727A US178681A US17868150A US2678727A US 2678727 A US2678727 A US 2678727A US 178681 A US178681 A US 178681A US 17868150 A US17868150 A US 17868150A US 2678727 A US2678727 A US 2678727A
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tank
liquid
dense liquid
suspension
casing
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US178681A
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Dru Marcel
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JARUZA A G CHUR SOC
JARUZA AG CHUR Ste
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JARUZA A G CHUR SOC
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B11/00—Feed or discharge devices integral with washing or wet-separating equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/36—Devices therefor, other than using centrifugal force
    • B03B5/42—Devices therefor, other than using centrifugal force of drum or lifting wheel type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B11/00—Feed or discharge devices integral with washing or wet-separating equipment
    • B03B2011/004—Lifting wheel dischargers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B11/00—Feed or discharge devices integral with washing or wet-separating equipment
    • B03B2011/006—Scraper dischargers

Definitions

  • Anotherobject of theprese'nt invention ds'f'to p'rovi'de "apparatus, as charae'teri'zedabove, in-- eluding a sedimentation vat into and -through which thedense liquid flows; an inclined annular easing -positionedat one side of the "va't with the forming the bottom portion-of the-vatito receive the heavy-settled solids,
  • Another object or the invention isfto zprovid'e apparatus, as characterized above, 'vvhei'ein' the meo'hanical 'partsare so constructed “as to "min-L mize the abrasive action of the dense liquid.
  • Another object of the present in-v-erition-i'sto provide apparatus, as Characterized above, "in whih the lifting means c'on'ip'r ises a "paddle WheeL-th'e bearings and control-mechanism :or whih are 'protected'from the "dense liquid with- "out the-necessity of using s'ealirfg joints.
  • knot/her bee't “of the invention is to reviee apparatus, as "characterized above, in which means ar'e provided .toprevent the "crushing "of large pieces-inf light materiabas. theyfaree'vaeuatad ev'er the overflow sill dfthe vat.
  • Atfurthenobject of the invention is to ":prev-ide apparatus for eeparating solidmaterial :of difierenttdensities -by 1 means of a i -suspension, is simple and inexpensive in constructionam! rugged-and :eflieient inoperation.
  • Fig; 2" is ase'c'tional -viw'takenon the IineSY Z Fig. 3 is a'see'ti'onalviewtaken (Julienne- 2 2 of' -Ei'g. l,”l'ooking'"to theleft;
  • s is'a view-similar to that smwn m i 'rgfia "butshowinga'travelling conveyor-beltsubstit d for the paddle Wheel for removing-the meme-r "solids.
  • the dense liquid may b'e-a suspension, foi' example,- a mixture- 0f fi'ne sadde s-water;
  • the heavy p'rodusts,fwhich settleto the bottorn, are i-ei r ve 'fromthe tank by means of "wrotating paddle Wheel-or'COhveYoi' mDuntedin nine 3 annular easing arranged at oneside o the tank.
  • the invention also ermaesmeam "f'c'irkio'rhbhsating for difierences in speeifib gravityof the dense liqiiidfat the overflow by' feeding tliedei'ise liquid-at different ahgl's'i 'nto the maihtaifik.
  • one embodiment of the"- ii.f1ven 'tion is shx wnii Figs. 1, '2 and '3, wherein the'dense *nqiifd the solid-material to be separated-are "delivered into agenerally rectangular sedimentation "t Hi-navi'n'g vertical side walls a g and 1 2.
  • time an ⁇ is shown as having a roundeibottofl'i l3 "vi/111611 inerges-intothe bottom portion drama; iilar easii'i'g'- M into'ivhich the heavy produts f to b'eevacuated'fi'om thetaiik.
  • the dense liquid shown being de ivered fall into the bottom of the tank and in the bottom portion of the annular casing l4, are adapted to be evacuated from the tank by means of a rotating paddle wheel 24 mounted on a conical hub member 25 and driven by a shaft 26 having a bearing 27 at the upper end of a conical housing 28 connected at its lower end to the bottom wall of the annular casing I 4.
  • This arrangement is such that the bearing is above the level of the dense liquid in the tank and is not subjected to wear by granular products to be separated therefrom. Also, the arrangement avoids the necessity of using specially packed, water-tight bearings.
  • the shaft 26 is adapted to be driven by any suitable power means. In this example, it is shown as having a worm wheel 29 driven by a Worm 30 on a shaft 3
  • the paddle wheel 24 has radial blades 35 which are adapted to contact the bottom and outer walls of the annular casing and convey the separated heavy products from the bottom portion of the tank to an outlet opening 38 in the upper portion of the annular casing, above the level of the liquid in the tank It). Then, the separated products are discharged through an outlet conduit or chute 31.
  • the blades are shown as being perforated to permit the water to flow back into the tank as the material is being discharged.
  • each blade is shown as having a pair of generally rectangular reinforcing cleats 38 on its rear face, with the widest part of the cleats at the inner end of the blade.
  • the cleated blades are radially removably mounted on the hub member 25 between bracket members 39.
  • a drain nipple as is shown as being connected to the lower part of the annular casing I 4 to permit the bottom of the tank and the casing to be cleaned out periodically. It is shown as being closed by a closure cover 4!.
  • Fig. 5 there is shown one embodiment of means to control the specific gravity of unstable dense liquid in the vat, so that heavier or lighter solids may be recovered at the outlet sill. This may be accomplished in various ways by measuring the density of the dense liquid at a given point in the vat near the level of the outlet sill and adjusting the angularity of the entering stream of dense liquid to change the density of the liquid in the vat.
  • a continuous stream or flow of the dense liquid is removed from the vat just below the level of the sill through a sampling conduit 42 to a float chamber 43 having an open upper end and a restricted outlet opening at its lower end, as shown... so that it will always be filled with liquid and the excess liquid will spill over the top of it.
  • the overflow chamber 43 is mounted within and overflows into a large container 44 which is closed at its upper end by a cover plate 45 and has a large outlet 45 at the bottom to permit all of the overflowing liquid to drain out through a conduit 4! for subsequent re-use in the vat.
  • a sensitive float 48 having a vertical stem 49 is submerged in the trapped liquid in the chamber 43.
  • the stem :39 is guided by a pair of verticaly spaced spider bearings 50 and 5! across the chamber 43 and container 44.
  • the upper end portion of the float stem carries a switch operating element 52 coacting with spaced switch elements 53-54 of a relay 55 connected by conductors 56 -51 to a reversible servo-motor 58.
  • the servo-motor 58 is connected by a chain belt 59 to a pulley 60 which operates a crank arm 6
  • the link is pivotally connected at its other end to a crank arm 63 rigidly connected to a pivotally mounted baflie or lip 54 extending below and across the mouth of the nozzle IE to direct the stream of entering dense liquid into the vat at angles responsive to changes in th position .of the float 4-8.
  • the arrangement is such that changes in the position of the float will close the circuit to the servo-motor and will maintain the specific gravity of the dense liquid in the vat substantially constant, at the overflow sill.
  • the vectors s, g and, r represent the direction of flow of the stream of dense liquid, the direction of gravity and the resultant, respectively.
  • the direction of the resultant r directly controls the specific gravity of the dense liquid at the overflow sill. The higher the angle of the stream, the greater will be th specific gravity of the dense liquid at the overflow sill.
  • Fig. 6 there is shown a modification of the separator, especially adapted for use in separating solid matter which may contain scraps of metal, such as bolts and the like, which would otherwise choke up the paddle wheel conveyor.
  • the annular casing I 4 extends slightly beyond and below the bottom portion of the tank i6 and each of the paddle wheel blades carries arc-shaped angle irons 65 secured to their bottom and end edges to provide peripheral crowns on which the solid matter to be separated is caught and conveyed by the rotating blades to an outlet conduit 66 which communicates with the annular casing adjacent to the inner end of the blades just above the level of the liquid in the tank.
  • This arrangement permits the blades to carry off all the solid matter and discharge it downwardly into the outlet conduit.
  • Fig. 7 there is shown another modified construction of the tank and the paddle wheel casing.
  • the paddle wheel is in the form of an annular cup 6i which is rectangular .in cross section and divided into compartments by perforated radial plates 88 and these compartments are open at their inner ends to spill the solid matter in the outlet conduit 69.
  • Fig. 8 there is shown a modification of the arrangement for evacuating the material from the top of the tank over the outlet sill.
  • an endless flexible belt 10 trained over wide pulleys H and 12 and having integral fins or blade members 13 riding on the sill and arranged to convey the separated, light material over the outlet sill of the tank.
  • the construction may be similar to that shown in any of the other modifications. This arrangement is desirable for handling large lumps of separated material which would choke up a paddle wheel.
  • an apparatus for separating solid materials having different specific gravities comprising an elongated sedimentation tank for holding a body of dense liquid, said tank having an overflow sill along one end, a chute for introducing the material to be separated into the tank, and means for introducing dense liquid into said tank to create a stream of dense liquid flowing toward said overflow sill, whereby the lighter separated material will be evacuated over the overflow sill; an inclined open-top annular casing positioned at one side of said tank with its lower end opening into and forming the bottom portion of the tank to receive the heavy settled material, said casing having an outlet opening in its upper end portion above the liquid level in the tank, the side wall of the tank adjacent the annular casing acting as a baflie member preventing the flow of the lighter material from the tank into the casing; a hollow shaft housing extending upwardly from said casing to a point above the normal liquid level therein; a shaft rotatably mounted in said housing and extending in a direction perpendicular to the bottom of said casing with
  • said paddle wheel is in the form of an annular cup, generally rectangular in cross section and wherein said circumferentially spaced and radially extending blades are perforated plates which divide said annular cup into radial compartments, said compartments being open at their inner ends.
  • each of the paddle wheel blades carries an arcshaped angle iron secured to its bottom and end edges to provide a peripheral crown on which the settled solid material is caught and conveyed by the rotating blades to the outlet opening in the upper portion of the casing.
  • apparatus for separating solid materials having different specific gravities by suspension comprising a tank for holding a body of dense liquid, said tank having an overflow sill along one end; a chute for introducing the material to be separated into the tank; and means for introducing dense liquid in the form of a suspension into said tank to create a stream of dense liquid flowing toward said overflow sill; a specific gravity measuring device for measuring the density of the dense liquid at the overflow sill; and means including a motor actuated by said specific gravity measuring device for varying the angular direction of flow of the stream of dense liquid across the tank in response to changes in the measured density of the dense liquid.
  • said specific gravity measuring device includes a float chamber open at its upper end and having a restricted opening in its bottom end, a conduit connected to said chamber and to said tank at a point adjacent to the overflow sill to permit a continuous flow of dense liquid from said tank to said chamber to always keep it filled; and a sensitive float having an elongated stem mounted in said chamber.
  • said means for introducing dense liquid into said tank comprises at least one conduit having a wide nozzle and wherein said means for varying the angular direction of flow of the stream of dense liquid across the tank includes a transverse bafile member pivotally mounted below said nozzle to deflect the stream of dense liquid as it emerges therefrom; a reversible servo-motor operable in response to variations in the measured density of the dense liquid at the overflow sill connected to move the baflie member about its pivotal axis.

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  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Description

May 18, 1954 M. DRU
SEPARATING SOLID MATERIALS BY SUSPENSION Filed Aug. 10, 1950 4 Sheets-Sheet l IE l2: 2.
Z' N VEN r02 Mann D20 By WvM 4 Sheets-Sheet 2 M. DRU
SEPARATING SOLID MATERIALS BY SUSPENSION Filed Aug. 10, 1950 May 18, 1954 INVENTOR Mantel. D490 ATTORNEYS May 18, M D
SEPARATING SOLID MATERIALS BY SUSPENSION Filed Aug. 10 1950 4 Sheets-Sheet 3 Mann. Dan
M n M firm/avers May 18, 1954 M. DRU
SEPARATING SOLID MATERIALS BY SUSPENSION Filed Aug. 10, 1950 4 SheetsSheet 4 IN VENTOR Mfincn .Dlzu
ATTORNEYS lower end of "the "casing Patented May 18, 1954 UNITED sir-Ares mum 132,678,727 LYSEPARA'EINGZ s oLnfMA-rmtmlis BY -SUSPENSION Applieation August-10, 1950,-Serial No;--17'8;681 "Ulaimspriority, applieatio'nTi'ance -August 17, 1949 7 0laims. (61. 209-1725) lid mateerence to *apparatus for separatin "rials "of different specific -=gravities by means or ia susperi'sion.
@One object or the present invention is to nfovide==novel and improved a'ppar-atu's 'ior separating solid materials of different 'spee'i fic g'fav itie's *by' means of a suspension-as for 'exampladn eoal washing installationsfior separating slate,' sand or other heavy constituents from the coal.
Anotherobject of theprese'nt inventionds'f'to p'rovi'de "apparatus, as charae'teri'zedabove, in-- eluding a sedimentation vat into and -through which thedense liquid flows; an inclined annular easing -positionedat one side of the "va't with the forming the bottom portion-of the-vatito receive the heavy-settled solids,
and lifting means mounte'din the inclined easingforraising the soli-d materialup to 'an evaduation "duct formed in the-upper "portion "of the c'asing 'so that the solid material Will b'e evacuated therethrouh. v 7
Another object or the invention isfto zprovid'e apparatus, as characterized above, 'vvhei'ein' the meo'hanical 'partsare so constructed "as to "min-L mize the abrasive action of the dense liquid.
Another object of the present in-v-erition-i'sto provide apparatus, as Characterized above, "in whih the lifting means c'on'ip'r ises a "paddle WheeL-th'e bearings and control-mechanism :or whih are 'protected'from the "dense liquid with- "out the-necessity of using s'ealirfg joints.
Another object or the invention is to provide apparatus, as "char'a'cte'rizze'd above, which the paddle =Wheel' blades ar'e providedvl iith means-to eliminate lrietioncaused by the 'solid -mate'r-ial as it ls'ra-i'sed bythe'avhel arid 't'o pi eventpie'c'es df 'metal scrap from bee'ori iing "wedged between the paddle wheel-arid V the casing.
knot/her bee't "of the invention is to reviee apparatus, as "characterized above, in which means ar'e provided .toprevent the "crushing "of large pieces-inf light materiabas. theyfaree'vaeuatad ev'er the overflow sill dfthe vat.
Another object of the invention. is: to. provide apparatus, as characterized above, in whieh means are provided to automatically adfiustthe specific g1lavity'-oithe==dense liquid at' -tliezoverflow'sillaof the V8=t,'-WheI-by09131330111183! bahad over'c th'e :sinking of the lrfeavy products.
atfurthenobject of the invention: is to ":prev-ide apparatus for eeparating solidmaterial :of difierenttdensities -by 1 means of a i -suspension, is simple and inexpensive in constructionam! rugged-and :eflieient inoperation.
Otherzobiectsandiadvantagesof the irlveri-tion willriappear 11in the :fielrowings speeifieation'fwhen considered with '=acoorrxpanying ldi 'awings, wherein:
J2 l 'i'g l -is a vertical, transvefsefs'etidn" embodiment er-a paratus eonstru'eted -in ance with the present invention; I
Fig; 2" is ase'c'tional -viw'takenon the IineSY Z Fig. 3 is a'see'ti'onalviewtaken (Julienne- 2 2 of' -Ei'g. l,"l'ooking'"to theleft;
Fig. 5 is "a longitudinal *setio'n'al view of "the va't in Fig. 1, and showing apparatusier n= trifling '-the specific gravity of the iiqiiidin' the l3 lag. 6 is a e-agmemary, transverse "sjetrenai *vie'w of the apparatus'shovvrr in fg.f1-,-b1it=sii6wing'a modified form of paddl -wheel; r
s is'a view-similar to that smwn m i 'rgfia "butshowinga'travelling conveyor-beltsubstit d for the paddle Wheel for removing-the meme-r "solids.
m aceordancawith this mverit QnHerEe Hqufii and solid substanee's ofdifierentspeifibj vetiesare delivered to "a large tank or vsewherein a liquid level is maintainedan'dfthe heavy preaucts ran to the bottom; "vvh'ile tl'ieFlighter mrdfductsare evacuated bybverflodiing'iviththe liquid. The dense liquid may b'e-a suspension, foi' example,- a mixture- 0f fi'ne sadde s-water; The heavy p'rodusts,fwhich settleto the bottorn, are i-ei r ve 'fromthe tank by means of "wrotating paddle Wheel-or'COhveYoi' mDuntedin nine 3 annular easing arranged at oneside o the tank. The invention also ermaesmeam "f'c'irkio'rhbhsating for difierences in speeifib gravityof the dense liqiiidfat the overflow by' feeding tliedei'ise liquid-at different ahgl's'i 'nto the maihtaifik.
one embodiment of the"- ii.f1ven 'tion is shx wnii Figs. 1, '2 and '3, wherein the'dense *nqiifd the solid-material to be separated-are "delivered into agenerally rectangular sedimentation "t Hi-navi'n'g vertical side walls a g and 1 2. time an}: is shown as having a roundeibottofl'i l3 "vi/111611 inerges-intothe bottom portion drama; iilar easii'i'g'- M into'ivhich the heavy produts f to b'eevacuated'fi'om thetaiik. 'At'one'e'ridjof he tank'the dense liquid shown being de ivered fall into the bottom of the tank and in the bottom portion of the annular casing l4, are adapted to be evacuated from the tank by means of a rotating paddle wheel 24 mounted on a conical hub member 25 and driven by a shaft 26 having a bearing 27 at the upper end of a conical housing 28 connected at its lower end to the bottom wall of the annular casing I 4. This arrangement is such that the bearing is above the level of the dense liquid in the tank and is not subjected to wear by granular products to be separated therefrom. Also, the arrangement avoids the necessity of using specially packed, water-tight bearings. The shaft 26 is adapted to be driven by any suitable power means. In this example, it is shown as having a worm wheel 29 driven by a Worm 30 on a shaft 3| carrying a pulley 32 adapted to be connected by a belt 33 to a pulley 3 also operated by the motor 23.
As clearly shown in Figs. 1 and 2, the paddle wheel 24 has radial blades 35 which are adapted to contact the bottom and outer walls of the annular casing and convey the separated heavy products from the bottom portion of the tank to an outlet opening 38 in the upper portion of the annular casing, above the level of the liquid in the tank It). Then, the separated products are discharged through an outlet conduit or chute 31. The blades are shown as being perforated to permit the water to flow back into the tank as the material is being discharged. Also, each blade is shown as having a pair of generally rectangular reinforcing cleats 38 on its rear face, with the widest part of the cleats at the inner end of the blade. The cleated blades are radially removably mounted on the hub member 25 between bracket members 39.
A drain nipple as is shown as being connected to the lower part of the annular casing I 4 to permit the bottom of the tank and the casing to be cleaned out periodically. It is shown as being closed by a closure cover 4!.
In Fig. 5, there is shown one embodiment of means to control the specific gravity of unstable dense liquid in the vat, so that heavier or lighter solids may be recovered at the outlet sill. This may be accomplished in various ways by measuring the density of the dense liquid at a given point in the vat near the level of the outlet sill and adjusting the angularity of the entering stream of dense liquid to change the density of the liquid in the vat.
In the illustrated example, a continuous stream or flow of the dense liquid is removed from the vat just below the level of the sill through a sampling conduit 42 to a float chamber 43 having an open upper end and a restricted outlet opening at its lower end, as shown... so that it will always be filled with liquid and the excess liquid will spill over the top of it.
The overflow chamber 43 is mounted within and overflows into a large container 44 which is closed at its upper end by a cover plate 45 and has a large outlet 45 at the bottom to permit all of the overflowing liquid to drain out through a conduit 4! for subsequent re-use in the vat.
A sensitive float 48 having a vertical stem 49 is submerged in the trapped liquid in the chamber 43. The stem :39 is guided by a pair of verticaly spaced spider bearings 50 and 5! across the chamber 43 and container 44. The upper end portion of the float stem carries a switch operating element 52 coacting with spaced switch elements 53-54 of a relay 55 connected by conductors 56 -51 to a reversible servo-motor 58.
The servo-motor 58 is connected by a chain belt 59 to a pulley 60 which operates a crank arm 6| pivotally connected to one end of a link 62. The link is pivotally connected at its other end to a crank arm 63 rigidly connected to a pivotally mounted baflie or lip 54 extending below and across the mouth of the nozzle IE to direct the stream of entering dense liquid into the vat at angles responsive to changes in th position .of the float 4-8. The arrangement is such that changes in the position of the float will close the circuit to the servo-motor and will maintain the specific gravity of the dense liquid in the vat substantially constant, at the overflow sill. The curved dotted lines in Fig. 5 show two angular directions of flow of the dense liquid longitudinally of the vat. The vectors s, g and, r represent the direction of flow of the stream of dense liquid, the direction of gravity and the resultant, respectively. The direction of the resultant r directly controls the specific gravity of the dense liquid at the overflow sill. The higher the angle of the stream, the greater will be th specific gravity of the dense liquid at the overflow sill.
In Fig. 6 there is shown a modification of the separator, especially adapted for use in separating solid matter which may contain scraps of metal, such as bolts and the like, which would otherwise choke up the paddle wheel conveyor. In this modification, the annular casing I 4 extends slightly beyond and below the bottom portion of the tank i6 and each of the paddle wheel blades carries arc-shaped angle irons 65 secured to their bottom and end edges to provide peripheral crowns on which the solid matter to be separated is caught and conveyed by the rotating blades to an outlet conduit 66 which communicates with the annular casing adjacent to the inner end of the blades just above the level of the liquid in the tank. This arrangement permits the blades to carry off all the solid matter and discharge it downwardly into the outlet conduit.
In Fig. 7 there is shown another modified construction of the tank and the paddle wheel casing. In that example, the paddle wheel is in the form of an annular cup 6i which is rectangular .in cross section and divided into compartments by perforated radial plates 88 and these compartments are open at their inner ends to spill the solid matter in the outlet conduit 69.
In Fig. 8 there is shown a modification of the arrangement for evacuating the material from the top of the tank over the outlet sill. In that modification, there is shown an endless flexible belt 10 trained over wide pulleys H and 12 and having integral fins or blade members 13 riding on the sill and arranged to convey the separated, light material over the outlet sill of the tank. Otherwise, the construction may be similar to that shown in any of the other modifications. This arrangement is desirable for handling large lumps of separated material which would choke up a paddle wheel.
From the foregoing description, the operation of the separator will be clear to those skilled in the art. It is relatively simple in construction and will last much longer than ordinary separators wherein the bearings for rotating the conveyors are submerged and are exposed to wear or abrasion due to the particles in the liquid.
Obviously, the invention is not restricted to the particular embodiment thereof herein shown and described, but is capable of various modifications within the scope of the appended claims.
What is claimed is:
1. In an apparatus for separating solid materials having different specific gravities, comprising an elongated sedimentation tank for holding a body of dense liquid, said tank having an overflow sill along one end, a chute for introducing the material to be separated into the tank, and means for introducing dense liquid into said tank to create a stream of dense liquid flowing toward said overflow sill, whereby the lighter separated material will be evacuated over the overflow sill; an inclined open-top annular casing positioned at one side of said tank with its lower end opening into and forming the bottom portion of the tank to receive the heavy settled material, said casing having an outlet opening in its upper end portion above the liquid level in the tank, the side wall of the tank adjacent the annular casing acting as a baflie member preventing the flow of the lighter material from the tank into the casing; a hollow shaft housing extending upwardly from said casing to a point above the normal liquid level therein; a shaft rotatably mounted in said housing and extending in a direction perpendicular to the bottom of said casing with its upper end extending through the upper end portion of said housing; a paddle wheel including a hub connected to the upper end of said shaft and carrying a plurality of circumferentially spaced radially extending blades rotatably mounted in said casing; and power means for rotating said shaft and said wheel for raising the heavy material settled in the bottom of the tank up to the outlet opening in the casing for evacuation therethrough.
2. Apparatus as set forth in claim 1, wherein said paddle wheel is in the form of an annular cup, generally rectangular in cross section and wherein said circumferentially spaced and radially extending blades are perforated plates which divide said annular cup into radial compartments, said compartments being open at their inner ends.
3. Apparatus as set forth in claim 1, wherein each of the paddle wheel blades carries an arcshaped angle iron secured to its bottom and end edges to provide a peripheral crown on which the settled solid material is caught and conveyed by the rotating blades to the outlet opening in the upper portion of the casing.
4. Apparatus as set forth in claim 1, wherein the lower portion of the annular casing extends slightly beyond and below the outer side wall of said tank.
5. In apparatus for separating solid materials having different specific gravities by suspension. comprising a tank for holding a body of dense liquid, said tank having an overflow sill along one end; a chute for introducing the material to be separated into the tank; and means for introducing dense liquid in the form of a suspension into said tank to create a stream of dense liquid flowing toward said overflow sill; a specific gravity measuring device for measuring the density of the dense liquid at the overflow sill; and means including a motor actuated by said specific gravity measuring device for varying the angular direction of flow of the stream of dense liquid across the tank in response to changes in the measured density of the dense liquid.
-6. Apparatus, as set forth in claim 5, wherein said specific gravity measuring device includes a float chamber open at its upper end and having a restricted opening in its bottom end, a conduit connected to said chamber and to said tank at a point adjacent to the overflow sill to permit a continuous flow of dense liquid from said tank to said chamber to always keep it filled; and a sensitive float having an elongated stem mounted in said chamber.
7. Apparatus, as set forth in claim 5, wherein said means for introducing dense liquid into said tank comprises at least one conduit having a wide nozzle and wherein said means for varying the angular direction of flow of the stream of dense liquid across the tank includes a transverse bafile member pivotally mounted below said nozzle to deflect the stream of dense liquid as it emerges therefrom; a reversible servo-motor operable in response to variations in the measured density of the dense liquid at the overflow sill connected to move the baflie member about its pivotal axis.
References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,633,371 Coe June 21, 1927 1,710,568 Carl et a1 Apr. 23, 1929 1,887,239 Hansen Nov. 8, 1932 1,895,504 Wuensch Jan. 31, 1933 1,938,937 Sheffield Dec. 12, 1933 1,988,371 Chance Jan. 15, 1935 2,110,760 De Vooys Mar. 8, 1938 2,139,047 Tromp Dec. 6, 1938 2,347,264 Holt et al Apr. 25, 1944 2,365,734 Tromp Dec. 26, 1944 2,486,682 Ridley Nov. 1, 1949
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US2798606A (en) * 1955-06-18 1957-07-09 Jaruza A G Chur Soc Apparatus for separating solid materials by suspension
US2889043A (en) * 1955-03-30 1959-06-02 Jaruza A G Soc Apparatus for separating solid materials of different specific gravities by means of a suspension
US2893556A (en) * 1956-01-10 1959-07-07 Okey George Ore concentrators

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US1938937A (en) * 1931-01-31 1933-12-12 Dorr Co Inc Sand washer
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US2893556A (en) * 1956-01-10 1959-07-07 Okey George Ore concentrators

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