@Ci- 29, 1946- W. L. zElGLl-:R ET AL } 2,410,326 COMBINED VI/BRATORY SCBUBBER, STRATIFIER, AND SCREEN FOR MINERALS _Filed Nov. 12, 1943 7'2 sheets-sheet .1 / O 5.78.?_ Y. Oct. 29, 1946. W. L_„ZEIGLER ET A1. ¿Home COMBINED VIBRATORY SCRUBBER, STRATIFIER, AND SCREEN FOR MINERALS Filed Nov. 12, 1943 2 sheets-sheet 2 ` F195 WLLLLAM Lamm-ER Snoentor c; LAL/Ds Y. GARBBR Patented Oct. 29, 1946 UITED STAT-ES 2,410,326 ~COI^YÍBINED >VIBlXtA'I‘QRY SCR'UBBER, STRAT -IFKER, AND SCREEN-»FOR MINERALS l‘William L. Zeiglen'Wallace, and Claude Y. Gar bei', Kellogg, Idaho, assignors to The 'Sink & Float-Corporation, New York, N. Y., a corpora l Application November 12, 1943, Serial No. 509,982 3 Claims. (Cl. 209-44) This invention relates to a combined vibratory scrubber, stratiñerand screen for minerals use ful in mineral particle treatment processes, and, more particularly, to a method of screening .ore particles and a stepped-pool Washing screen ’for 2 . ñoat recovery is to be economically practical or even possible. The prior treatments of min erals, therefore, according to conventional prac tices of screening and desliming, require large volumes of water to produce satisfactory results. It appears to be a quirk of nature rthat minerals must be found in dry areas where such quantities treating such multi-size mineral particles for screening and desliming or decolloiding of the material or for .the separation and sorting of of Water are not always available for use in the extraneous materials that may therewith be in crushing and-sorting stages of the milling oper cluded. 10 ations. .In the `art of mineral separation, a common A fairly recent innovation in the more modern practice is to Vgrind ore in the presence of water mills has been the adoption and use of vibratory to reduce its size to particles that maybe treated screens for medium, coarse and fine sorting. In by sink and float, jigging, tablingor other related such devices a rapid and low amplitude `positive processes. Objects of grinding-are theliberation 15 vibration is imparted lto move the screens >in of mineral particles, sizing for subsequent treat Various horizontal, oblique or vertical motions, ment, and to meet commercial requirements in with or without the screen being supported truly an end product. .It appears to loe-an inescapable horizontal. Such vibrations are employed to pro result of Wet grinding that there is createdslimes duce screening as well as forward feed of the or colloidal materials to the detriment Aof the 20 material. These screens are recognized as hav subsequent `treating processes. In the -case of ing good volume but, as we have learned in our crushed materials .slime coatings will make the wide experience in mineral recovery, are accom material untreatable and reduce the eïñiciencyof panied by the problem mentioned above of ag the sink and float steps. glomeration of the fines, slimes and colloids with It has been our observation that when crushed 25 the minerals in a highly detrimental manner by ore contaminated-with slimes or colloids -is .passed altering in an undesirable Way the specific grav to conventional screens for removal vof the lines ity and viscosity of the sink and float medium as from the coarser particles the Whole volume Atends well as through the tendencies of the slimes to to agglomerate linto a mass in which `the slimes contaminate the medium and consequent impair are plastered in a gel-like state upon the particles 30 ment of the sink and floatprocess. In all cases, to thereafter travel with them into subsequent even where water supply is no problem, high ve sink and iioat or recovery steps to the detriment ì locity spraying does not result/infill] or satisfac of these later operations. Such occurs rather tory screening or desliming. than the more desirable screening, desliming or `Having in mind the'defects of the v_prior lart ‘ decolloiding which we have found possible vto per 35 of screening, it is an object of our invention to form with a maximum output ,of clean valuable .provide a method .and means of handling parti material at high speed and in `great volume by cle materials in a manner to produce accurate the use of our invention more'fully described separations or sorting in great capacity with a herein. marked delineation between various products of Another diñiculty that is encountered in screen 40 the feed mass. . Y . ing and desliming operation arises from ascarcity Another object of our invention is to provide a of water for use in spraying the material to elimi sorting screen .and operating means therefor .that nate the colloids or slimes. This clifliculty is par will fully perform the steps of our method vof ticularly prevalent in the desert mining districts, particleseparation without including the prior as are common-in California, where the .amount art defects of such similar mechanisms. Still another obiect .of this invention .is the :pro vision, in a sorting screen of .the type mentioned, of a stratifying and scrubbing .pool which will of Water that may be apportioned to desliming must be cut to the absolute minimum since slime is not readily dewatered or thickened. In the art of mineral recovery all of the prob rapidly and accurately .produce separation of lems mentioned above are focused into one large 50 mixed and multi-size particles in any of several problem making for real trouble vin .the Imilling operations. For example, it appears to be com mon for minerals when ground to be accom desired. manners, while also preventing or break ing up agglomeration. ’ A still further Yand more specific object ofthis panied bylarge quantities of fines, slimes and invention is .the provision .of a vibratory tscreen ...colloids which must be removed if `a Asink and 55 having stepped pools in 'sequence for vparticle 2,410,326 4 3 Figure 3 is a plan view of the frame and its treatment in a series of stages at a high volume feed without slime contamination of those parti cles most sought by those least sought. The foregoing objects and others ancillary screens, Figure 4 is a vertical sectional view on the plane suggested by lines 4_4 of Figure 1, Figure 5 is a perspective View of a portion of a thereto we prefer to accomplish as follows: According to a preferred embodiment of our screen, method of particle separation, we feed crushed Figure 6 is an enlarged fragmentary sectional ore or similar granular material into a pool of nuid that is under the effect of reciprocatory or view of a portion 0f the screen and the dam used thereon, and Figure 7 is a fragmentary View in cross section gyratory vibration. During such cycles of vibra 10 showing the manner of applying the method to tion the material is subjected to the mechanical the ordinary fiat screen, forces in the presence of the water in a pool and A separation method and means for use here without screening and is then passed across a in to overcome the defects hereinbefore enu screen for sorting and the elimination of certain of the mixture therethrough and the passage for 15 merated must have at least two totally distinct characteristics; th'e method must be capable of ward of that which does not go through the performance with a high capacity output coupled screen. In the specific embodiment of the inven with high efficiency of separation of various par tion shown here, we arrange that these steps be ticles in the feed material; and the mechanism performed in repetition several times for subse quent retreatment either to variously grade the 20 must be capable, in a constant manner, of per forming the process with a maximum of efficiency and a minimum of wear under hard usage. Ac cordingly, a preferred embodiment of my inven material into several sizes or to repeatedly sub ject the material to the same action for the elimination of one content from the remainder of the feed mass. tion, referring .to Figure 1 of the drawings, is In the former case, screens having varying characteristics are included in 25 constituted by a resiliently supported frame which has as the principal bottom member there the sequence while in the latter case the screens of a perforate and imperforate screening plate. are identical so that al1 the undersized material is The frame comprises upright side Walls I0 and I2 the same and the coarse will be uniform and joined at the feed end by wall I4 and at the merely have been repeatedly retreated. The screens are supported in incline so that a wedge 30 tail end by wall I6 which is slotted at I8 for the outward passage of tailing materials from the shaped pool may be created with the pointed end inside the frame. Near the middle of the side directed with the feed of the material. walls a cross beam 20 is secured therebetween That portion of the screen plate forming the to stiffen the frame and to form a support for bottom of the pool is imperforate while that por tion that lies under the tapering end of the pool 35 the shaker head 2I shown in Figure 1. This shaker head includes case 22 in which is jour and forward thereof is perforate for the down nalled for rotation parallel shafts 24 and 2E to ward passage of particles that are to leave the the former of which is secured drive means to ¿ mass along with a portion of the ñuid. Water which power is supplied in a conventional man or other fluid supply means are provided to flood ner to produce rotation of shaft 24 and through 40 the same into a pool in low pressure slow velocity gears 30, 3I to driven shaft 26. Each of these streams. Likewise material feed means are em shafts have unbalanced rotor members which ployed for supplying material to the rear end of operate to unbalance each other and create vi the pool in a constant manner. The screen is bration. supported in its preferred angularity in a frame The frame formed of walls I0, I2, I4 and I6 is that is in turn resiliently supported upon springs 45 spring suspended by resilient links 34 from suit so that it is free to move under the effect of a able overhead supports 33 and, when the vibrator shaker mechanism 'associated therewith for that head 2l is attached and caused to operate, will purpose. In the case of a desliming operation receive from said head vibration which causes wherein the slime passing through .the screen tends to stick to and travel along the underside 50 .the frame and its screens to move in gyration preferably at an ~angle oblique to the generally of the screen throughout its length means are pro horizontal plane in which the frame is disposed. vided for damrning such flow and for directing that Near the lower edges of the walls forming the material downward away from the screen and to frame in cups 35 is mounted a plurality of cross free it from the mechanism. In certain in bars 36 which are shown to be canted forward stances a dam may be provided across the upper so that the upper forward edge of each over face of the screen to retard stratification and hangs the lower edge on the forward face. The fluid movement in a forward direction to meet upper and lower faces of each bar 36 is substan conditions sometimes encountered wherein it is tially horizontal. These bars form the primary desirable to lengthen the period that the par ticles are inthe fluid pool. , The novel features that we consider charac teristics of our invention as set forth with par 60 supports for the sorting screens 38, 38a, 38h, 38e and 38d each of which have end flanges 39 and 4i! that are inclined at an acute angle to the screen and oppositely to each other for en ticularity in the >appended claims. The inven gagement of the screen to adjacent bars 36. The tion itself, however, both as to its organization and the method of its operation, together with 65 rear ñange >39 is hooked over the lower edge of the rearmost bar 36 of an adjacent pair and the additional objects and advantages thereof, will forward flange 40 similarly engages over the up best be understood from the following descrip per edge of the forwardmost bar of such a pair. tion of a specific embodiment when read in con The rear edge of screen 38 which is the first of nection with the accompanying drawings, in 70 the series is hooked under the flange of anchor which ' clip 42 mounted on the frame and is held there by Figure 1 is a longitudinal vertical sectional view the retainer bar 44 through the instrumentality of a vibratory screen that performs our method of bolts d5. A spring leaf 4B presses the upper and embodies our invention, A Figure 2 is an enlarged view of a portion of face of the screen 38. The most forward end of the screens of Figure 1, screen 38d, the last in a series, is engaged by 2,410,326 anchorA clip 48 and drawn taut by the bolt 50. Since the intermediate cross bars 36 are loosely seated in cups 35 the whole serrated assembly is Ímovable slightly under the urgence of the end anchor take-up means, `the screens may be ten- ' sioned to a degree after assembly. 6 ration) vand produce cleaner overflow oversize than has .heretofore beenk possible. ` By the use of low amplitude high frequency vibration during the stratifying period of our process we speed the layering effect without re ïtardi-ng the capacity of our separation means be I lEach of the screens comprises imperforate cause when separation takes place the portion of vportion A and perforate portion B as suggested the material to lbe separated from the massleaves in Figures 2 and 5. The imperforate portion is in ~rapidly and without requiring prolonged screen the rea-r part of the screen, that which is sloped l0 ing as has been necessitated before. An im downward and rearward to join with the cross portant phase of our method lies in the form bar. Conversely the upper and forward part oi ing and maintenance of a pool of fluid contain the screenis foraminous~ ing particles of various sizes and natures which Thefront face of each cross bar 35, the side pool is then vibrated to stratify and scrub the walls of the frame, and the portion A -o'f each same and to intermittently separate, decant and screen forms a wedge-shaped pocket which will advance a portion of the mass over the screen in contain fluid and material during operation of its highly stratified condition to permit the slimes, the machine. This fluid in the pool P is wedge fines and fluid to drop out of the mass and away shaped since it has an upper generally horizontal from the individual particles passing on over face which converges with the rising bottom 20 the screen. formed by the imperforate portion of the screen inl tangentiality with the perforate portion B. Beneath each screen on suitable cross bars 52 -we mount resilient buffer supports 54 in contact with the under face of the screen. On occasion a dam 55 is attached to the mid upper Space of the screen to alter the fluid level in the pool P and to retard feed material in the pool for purposes of stratification or to prolong the scrubbing treatment in any one pool. These dams are preferably formed of rubber and are usually attached to the screen along the line of demarcation between the perforate and imper Operation of the appaïwtus With the screen resiliently suspended and the shaker head operating to vibrate the screen, fluid gangue is fed to the screens near the left end as shown in Figure 1 lby the conduit 50 and addi tional treating liquid is supplied near the pockets in the screen assembly through the spigots 66. The mass being treated forms a pool on the lower rear end of screen 38, as well as on the others in the case of a sequential series, and is there momentarily retained while it is vibrated where by the particles in the mass are scrubbed against forate zones A and B. each other in fluid and the walls of the pool to Feed material is delivered to the left end of 35 separate the slimes from the coarser particles and the screen as shown in Figure 1 by a conduit 58 the mass is stratified. During the cycles of vibra having a discharge end 60. This material being tion of the mass a portion of the same is ad largely fluid flows readily~ onto and across the Vanced up the inclined face of the screen from screen 38. the imperforate zone A to the perforate zone B Water or other treating fluid is delivered to 40 which permits the fines and slimes that have the screens through a primary conduit 62 that collected in the lowermost stratum as well as the runs longitudinally of the frame above the screens and has several lateral headers 64 from which de fluid to drop through the openings in the screen while the oversize particles pass on forward to pend the spigots 65. The incoming water is pref the lip at the upper corner of the support bar erably not under a great head, it being primarily 45 36, whence it cascades into the next pool and intended that it fiow freely under the natural is similarly retreated either in repetition or for effect of gravity to discharge smoothly rather the next largel` sizing and sorting operation. than jet-like as has previously been conventional Such slimes and fluid as descend through the screen openings often tend to cling to the under The method 50 side of the screen and produce blinding thereof or to travel forward in an undesirable underfeed In practice our separation process comprising following the contours of the screen until it is the treatment of a fluid mass composed of liquid returned to the coarser mass to recontaminate it. and solid particles to effect a separation of a po-r To defeat this-action we employ the' dams com tion of the particles from others thereof. As has been said before, such separation can be desirable 55 prising members 52 and 54 which serve to sup portV the screens from below. As the forwardly ` in selective separation of several types or sizes creeping slime contacts the rear side‘of the dam of particles from a mass such as sand and gravel it is deflected downward away from the screen or, as we have more particularly applied the in and is caused to fall away by the vibration of vention, to the separation of slimes or colloids those members. from oversize mineral particles in mineral treat The dam 56 on the upper face of the screen ment processes. In either case the basic function may or may not be used, but when it is used it of the method is the same and comprises the im serves to retard forward movement of increments parting of vibration to a fluid mass but without in the pool P until proper stratification has taken permitting screening of the same during a scrub place and the fiuid level has risen to permit an hing and stratification period and then, subse increment to pass over the apex of the darn. quently, screening and decanting a portion of the Although we have shown and described a cer stratified mass to remo-ve a selected portion or tain specific embodiment of our invention, we are stratum from the remainder. Therein lies an fully aware that many modifications are possible practice. important distinction from prior conventional 70 to meet slightly altered conditions. This we have practices wherein screening takes place simulta in mind throughout our description of our inven neous with scrubbing and stratifying since by tion, which we claim as follows: postponing the screening operation until adequate O-ur method and mechanism may be applied to stratification takes place we facilitate the scrub existing flat top vibrating screens by fastening bing and desliming (in the case of mineral sepa bars 68 across the screen as shown in Figure 7 8 -to maintain liquid pools on the top of the screen plate or cloth. This apparatus consists of cross 'barsGBboth above and below the screen plate or -cloth between which the screen is supported to maintain the liquid in the pool. VThe perfora `tions -in the screen or cloth are stopped olf by a suitable plate as ‘Hi which may be clamped be tween the bars for secure placement. » ’ We claim: plates being characterized by being smooth from the root across the imperforate and perforate 4portions to the apex, and means for vibrating said deck longitudinally thereof, whereby particle bearing fluid has the particles therein scrubbed and stratified and portions thereof intermittently decanted for the removal of a portion of the fluid and of particles of a size to pass through said screen. 3.7A vibratory separator, comprising: a ser '1. A vibratory separator, comprising: a ser 10 rated deck formed of inclined plates having risers - rated deck formed of inclined plates having risers `»between adjacent plates, each said plate being perforate adjacent its apex and imperiorate ad jacent the root, saidplates being characterized between adjacent plates, each-said plate being perforate adjacent its apex and imperforate ad jacent the root, said plates being characterized by- being vsmooth from the root across the imper 15 by being smooth from the root across the imper forate and perforate portions to the apex, and >forate and periorate portions to the apex, and means for vibrating said deck longitudinally means for vibrating said deck longitudinally "thereof, whereby particle bearing fluid has the ` particles therein scrubbed and stratified and por thereof, whereby particle bearing fluid has the particles therein scrubbed and stratiñed and por tions thereof intermittently decanted for the re tions thereof intermittently decanted for the re 20 moval of a portion of the fluid and of particles moval of a portion of the fluid and of particles of a size to pass through said screen, and de _ of a size to pass through said screen. fiectors in contact with the underside of said 2. A vibratom7 separator, comprising: a ser plates to prevent creeping of slimes and the like rated deck formed of inclined plates having risers ybetween adjacent plates, said risers being canted forward, each said plate being perforate adjacent its apex and imperforate adjacent the root, said ' and to direct the same away from the screen. WILLIAM L. ZEIGLER. CLAUDE Y. GARBER.