Патент USA US2411288код для вставки
Nov. 19, 1946. ‘ A. R. MORSE ` ` 2,411,233 FROTH FLOTATION WITH‘SIMULTANEOUS FILTRATION AND COLLECTION 0F EROTH .Filed uar‘çh 26, 1945 \ f 2 sheets-sheet `1 JNVENTOA ALBEET E’EY/VOÁPS HORSE A Trop/vn; . Nov. 19, 1946. A_R, MORSE 2,411,288 FROTH FLOTATION WITH SIMULTAÑEOUS FILTRATION AND COLLECTION OF FROTH Filed March 2e, 1945 2 sheets-sheet `2 INVEN TOR. ALBERT REYNOLDS /VOJE’SE ' ATTORNEYS Patented Nov. i9, 1946 i N _l is 2,411,288 i " ,_ #UNITEDÍSTATES PATENT . i '2,411,288` ‘s s rRoTH‘ FLoTAfrIoN WITH SIMULTANE» DUS FILTRATION `rum COLLECTION 0F FROTH l ab _Albert Reynolds Morse, Shaker Heights, Ohio b , ,l ` "Application March 26, 1345„s7ena1no. 584,918 `112 claims. l (Cilaos-7184)@ "I'his invention-relates to "a method and appa 's 1 _ s i i ‘ aération ‘eeumm jcontact Iwith ‘fthe with. „then ` ratusfor separating or concentrating the valu 'away from the celllwhere accumulatedconcen able constituents of mineral ores, i."e.`,"the` sepa ` trates areremoved,l and ¿then ‘across the cell again, and so on. f I’prefer to reduce `the pressure ration or> concentration `of the more‘valuable mineral or minerals `from the worthless part of ‘5 lbehind that portion‘î‘óf the‘illter in contact with the ore,` or gangue. ' More ‘particularly the in i the froth and apply pressure `to the portion over vention relates to the recovery of the valuable the> bin tof‘dischargefthe:concentrates -therefrom. - "minerals, metals or ,concentrates from flotation ‘ ‘I'hat portion of 4,the filter in ,contact` withthe , -cells. b f ` »f frothu continuously picks up concentrates'from The generalfob’jects‘ of `the invention are the 10 the undilutedfroth,"the concentrates being con tinuously removed inthe _region adjacent‘the‘ Vprovision of a method of separating‘or concen trating the valuable minerals, 'metals and the l ' like (hereinafter collectivelyreferred to as ‘ícon bin. ' Thus the mechanismjrequii‘ed formechan-` of a simple andeffective apparatus forfcarrying out `the method.` ‘ More specific objectslare the `cbviated,` resulting jinv substantial decreases "in provision of an economical and eflicient method pared to present practices." Furthermore, by ymuy skmiming thé 1118er ‘cells is enmmated," the centrates'”) contained in` mineral ores at“ a de dilution of the concentrates byjwater isfdone creased cost` and with increased efñciency as 15 away with, andthe necessity for pumping‘the compared to present methodsy’and" the provision diluted concentrates tothe thickener and filter operating, installationand capital costs as com " and an -apparatus’for‘carrying out the method '20` whereby concentrates of low moisture ,content can be“ recovered` from the froth produced by flotation cells." b b _ ` l ` , The flotation method of'separating valuable ` controlling the liquid level‘in the cell, "the filter element may be positioned in contact with the `ifroth Aat the level containing the greatest amount of concentrates, insuring" efficient ` operation. 'I'he froth is continuously renewed by the ‘oper minerals from ore ‘is well known and `widely 25 ation of the agitators `orthe like, and fresh pulp used; According to the ordinary practice, a is supplied‘to the cell‘in the usual manner.’l s "The watery mixture known as f‘pulp,” containingthe arrangement is preferably such‘` that ith'e‘con ore to‘which the proper `quantity ‘and kind of centrates are picked `up lcontinuously from the .oil or other ‘reagent has been added, is beaten , -, by an agitator or other means producing `a froth )30 on‘the top’ of .thelcell whichcontainslth‘e con centrates which it i‘s sought to‘rec'over. These `mineral*concentrates are `heavier thanwater, s entire surface of the cell, wthereby insuring rapid and efficiënt operation'.` The method maybe carried out rapidly and economically by sturdy and compact apparatus which can be constructed ` at relatively low cost and which requires substan tially less investment in equipmentf‘and mill \ ‘ level’and `are ordinarily removed from thecell .35 ‘Space than the usual apparatus required to do by mechanically skimming the froth from the the same amount of work, " " " “ l x vbut are “supported `by the froth _above the liquid »vcell. The froth >containing the concentrates is ` `A preferred form of japparatus 'forcarrying „diluted with water for convenience in’handling ` `-out -my method‘is illustrated in the‘drawings 'ini „ and then pumped‘to aïse‘t‘tling-t'ank or‘thickener, which Figure `1fis> a ‘vertical section through a and‘finally to a filter where the concentrates are 40 separated from the Water and discharged into a flotation cell embodying my invention and show. ing‘a preferred‘form of iilter‘apparatus for‘reà ` inn;` According ff to the 'present invention, ‘ the" con->` moving the concentrates from the cell, thefsec `centrates are recovered vdirectly `from the yun diluted‘ froth, preferably‘from the upper b sur- 145 face of the flotation cell by a downwardly fac ing surface disposed in contactfwith the froth, tion` being taken >as ‘indicated .by line I`-§Íi "of Figure 2t Figure 2 is a horizontal Sectional -view takenalong Aline 2`-`2 of Figurebl: Figures ‘3,2 df and 5 are 'sectional _details on‘an enlargeduscale ` 1 then` Athe surface‘is removed‘from `the froth, carrying with `-it `the concentrates, which are thereafter dischargedfrom the surface directly `50 show_the construction theì‘e‘òfi Figure 7 is a sec into `a bin. Preferably `theïsurface is "composed I tional detail `of the filter“ element` takenalong " `cfa suitable filter` material, suchas a permeable \ , the line`1-1 of Figure 6; "and Figure 8 .is a de~ , fabric. The surface` preferably,` is continuous, tail illustrating a preferred form ofbvalve` `plate and ismoved through a path lsuch ¿that each ` for* controlling 4the application ï of suction and b portionthereof is `moved across the top‘of‘the `55 pressure to the bfilter element.“ y ' ‘ ` ` \ ‘ annees _ As shown particularly in Figures 1 and 2, an apparatus embodying my invention comprises a flotation cell, which for the sake of compactness tained substantially ` constant by conventional float controls and valves, not shown. As is cus tomary, the float controls can be adjusted to vary the pulp level to provide the optimum yield. Upon operation of the impellers or agitators I8, of the entire apparatus, preferably but not neces sarily is made in arcuate form, occupying about 180° of arc. The cell comprises the arcuate or a layer of froth carrying the concentratesand ` ' comprising enormous numbers of minute bubbles semi-annular tank indicated generally at 5 and having.._an„inner_curved or arcuate wall 6, an is formed in the usual manner onv the top surface of the liquid pulp as indicated diagrammatically walls 3 and III. _The tank may be vconstructed 10 at 40. In order to remove the concentrates from the cell, I preferably employ a filter indicated of sheet metal in any conventional manner, the parts being securedtogether as by riveting or generally at 4|_ and shown best in Figures l, 6 outer `,wall 1._ afbottoni` Wall 8, and radial end welding. An intake || is Adisposed at one side ` and _7. 4'I'he filter is circular in form, is support ed concentrically with tank 5 and bin I3, andV of the tank near the bottom thereof, the pulp may comprise a circular disk 42 having a down ' being introduced through this intake in the wardly extending :cylindrical peripheral flange 43 lthrough the 'outlet I2 disposed at the opposite ' _and a similar cylindrical inner flange 44. lThe slde of the tank from the intake I I. To receive y outer flange 43 vhas a radius slightly greater than 'the concentrates recovered from the cell, I pref the radius of the outer wall 1 of the tank, while » usual manner. The tailings may be discharged erably provide an arcuatel or semi-annular bln 20 a circular disk 45 having a radius slightly less. vI3, complementary to the tank 5, and made up vof than the radiusbf theinner Vwall 6 _is secu1î¢d to the lower edge'of the ñange y44'. ’I'he annular spacev between the'ilange 43 and the .edgel of disk 4_5 is covered lwith filtering material, forex ample, canvas or othersuitablefabric, 46 backed _a bottom plate, I4, curved side Wallsv I5 and I6, " Yand radial end walls I1. ` This arrangement lends itself to the useoi!` acontinuously rotated an nular tllterjelement disposed overthe annulus made up of the'tank'f»l and'bin I3. _In order_t‘o agitate the. pulpjand generate the up by wire screen 41. The c1oth_,46 and screen 41 are spaced from- the disk 42 and the'spaoe froth, agitators Il!` and '18d Aare- provided within , between the disk land the. screen is divldedrinto . a plurality of segments by radially extending ver "construction, and _while I have shown two such 30 tical partitions 46,_the partitionsseparating the the tank 5. lThese maybe of any conventional ` 'agitatorsin thelpreferred embodiment, it will be entire filter in effeçt'into separate filter elements to each of which suction and pressure maybe Y " understood`A that if >`desired onlya single agitator v may be employedor more than two agitatorsmay i 'be used, `depending uponl the ,size and 'shape of the-cell, andthe materials being handled. ;While the agitators themselvesmay be of any conven successively .'applicd.k » ` y » , This last’ result isk obtained by .providi?gfuie ` 35 plate 45 with a plurality of ports or openings 43 ~ through which suction >or pressure may Vbe- ap pliedntherebeing `one port` or opening 43 for each ' tional construction, they are preferably driven `by ‘ lmechanismsl such as shown in the drawings, segmental filterelement. „ _'_l’he plate `45 alsofunc ratherV than by the conventional overhead or ver tions to mechanically support the entire ñlter for , ` tical drive mechanisms. The agitators I8 and |8a and their respective driving4 mechanismsrare 40 preferably identical;l accordingly only the driv rotation about its> vertical axis,„the plate being, supportedon block 5| carried by asuitable bear ing 52 `upon the pedestal 53. The entire assembly - _ing mechanism for agitatorïlß ,will be described in detail. The same reference characters are ap is rotated by the drive shaft 54, which is driven ' plied to similar parts in both mechanisms. Pref revolutions per minute, by the motor 55 through erably, agitator `|8 is,l rotated at a speed of, for> example, about 1800 R..P.` M. by a shaft!! which is supported in suitable bearings 20 in a housing 2| _mounted lin tank 5 byfthe supportingY bracka . suitable reduction. gearing (not shown) and bev- f at relativelyslow speed, for example one or‘two ets 22. At its upper end the shaft |9~is provided 50 Í'with a beveled gear 23 which isvengaged by the _ , beveled gear`24 mounted on the `horizontal shaft' 25.i The shaft 25 is carried in suitable bearings in the horizontalhousingmember 21 and by the l outboard _bearing 28, _and is driven by motor 29 _ through pulleys 30 and 30a and belt 3|. ' eled lgears 56 and-51. » Y i " In order to'apply suction lto the >l`filtery segments l _whenvthey are disposed in contact with'the froth on `top 4ofthe flotation cell and; pressure to the segments whenthey are over the bin\.|3,rI'pref- erably employ a valve _mechanism such as the valve plate 60 `which is „disposed immediately-be neath the plate 45 and in sealing contact .there--y with. The plate 6|l’asshown particularly in IIi‘Ig-> ure 8 has an arcuate suction port 6| and an ar It will be `noted that> the shaft -_25_ passes cuate pressureport'62 which ~are adapted to reg-r through a packing or- stumng box 32‘as it leaves ister with ther openingsäß inv theplate ,45. The ` suction port 6| Vis_ connected through the mani-> ‘fold 63 to the conduit v64 leading toa vacuum » . the _housing '21, and the housing 21_ is ¿ provided with 'a lateral inlet`33. to permit air under pres sure to be supplied to the interior of the housing . . through the conduit> 34. pump, while ‘the pressure port 62 is connected . Bythis means a slight ` positive pressure may be maintained within >the housings 2| and121, maintaining the level ofI any Vliquid'that mightleak past the end member 35 into the housing 2| below the level of the lower bearing 20. Thus,ithe bearings and gears of the agitator drive are protected fromv possibility of through the manifold 65 to the rconduit 66 lead ing to a blower or othersuitable source rof iluid underÍpressure. Ii' desired,_sealing rings Bland 65 59a may be provided to reduce leakage between the valveplate 60 and plate45. ~ - » l _ By this arrangement, each segmental filter ele" ment is connected with thevacuum line as the» ' " _ damage by the abrasive pulp contained lin the rotation Vof the >entire `»filter brings each element - tank 5. Also, if desired, air can be supplied to 70 successively over the flotation cell 5> with the filter the tank through‘theconduit 3,4 and housings - >cloth 46 in contact _with the froth on the top _of ` «21 and 2|, being ’discharged into the p'ulp‘at the " ythecell.` Each „port 49 remains'in communica'.lower end of the housing 2|. ` ’ . The usual anti-turbulence grid 31 Visprovided at the customary level. _ The pulp level is main tion with the vacuum line during the entire time that its associated segment 'is -in contact with’the - froth and until such segment approaches ¿ _the> asians 6 scraper 10. The suction preferably is maintained \ wall l and engaging the underside of the nlter ~‘ as long as practical after the segment leaves the cloth as shown in Figure 3.` A trough 1l is pro froth in order to remove additional moisture from vided to catch any froth or liquid that may over the concentrates. ‘ As each segment approaches flow the wall 9. At the exit sideof the cell, a `the scraper 10 in its travel over the receiving bin similar flange, bent in the direction of move-` I3, its associated port 49 passes over the solid mentmay belemployed, or I may employ rolls ` portion 61 of the valve plate 60, shutting oli the suction connection momentarily, and then reg isters with the pressure port` 62. ,Thereaften ` each port 49 remains in communication with the pressure port 62, and thus Vwith the source of air ‘Y under pressure, as its associated segment travels 15 and 16 mounted »in the tank adjacent `the radial wall I Il ; the roll 15 being arranged to en gage the layer of concentrates on the underside ofthe filter cloth.` The two rolls together func tion to block» the space between the top of the wall I Il and the` lfilter cloth against excessive leak l age, and‘at thesame time to sufficient `clearance, in its arcuate path over the remaining portion of "the arcuate bin I3. As each segment approaches to preventthe layer of concentrates being scraped the >end of the bin the pressure is“ cut off `by the 15 as `by »the top of the wall I0. Here again, a trough solid portion 88, and then the suction connection member; 11 ,isL providedto catch any leakage. is restored as the segment again comes in con 4Similar fiangemembersare provided on the arcuate wallsl 6 and 1, Figure 5 showing the ar In operation, the suction, coupled with the well rangement .on the outer wall 1, which comprises known tendency of the concentrate film to ad 20 a rubber ñange member 1B mounted adjacent the here to any surface, even though 4the bubbles upper part ofthe `Wall and adapted to slideably making up the froth are broken, causes the con engage the depending portion 19 of the flange centrates contained in the froth to adhere-` to the 43. For convenience in illustration, the liquid underside of the iilter cloth in the form of a paste and froth are not shown in Figure 5r 'I'hetrough or slime in spite of the fact that the concentrates 25 member 80 is provided to catch any leakage. A tact with -the froth. . , » ' ~ _ The layer or cake of „similar flange member `8| mounted on the inner concentrates builds up on the undersldemf the wall 6 `(see Figure l) engages the peripheral edge ‘ -cloth of each segment asthe segment travels of the valve plate` l5.A 'I'he trough’member 82 is around and over the flotation cell, and the con provided to catch any leakage that may occur centrates are discharged into the bin I3 by the 30 along this wall. `IBy this arrangement, the filter application of pressure to the interior of the seg _ member is substantiallysealed against vthe upper ments when they are disposed above the bin. edges of the tank 5 in‘its travel thereover.V `Be 'I‘he scraper plate 10 is preferably provided to as cause of the reduced pressure within the filter sist in the removal of the concentrates from the segments over the tank and because lof the pres underside of the filter member. This `may be 35 ence of the sealing members, there is no excessive mounted upon suitable support 1I` (see Figures leakage _or overflow from the tank, although if de l and 2) and is arranged at an angle as shown sired, a positive pressure of a few inches of water to scrape the concentrates from the underside of may be maintained within the ïtank to assist in Y ‘ are heavier than water. ,the filter cloth and into the bin. 'I'he action of the filter elements in `picking up 40 the concentrates from the froth is shown di agrammatically in Figures 3 and 4. As indicated filtering action.` „ _ » ’ .y In operation,` the pulp treated with flotation reagents in the usual manner is supplied to the cell through the intake pipe II and the tailings in Figure 3, with the` filter turning in a clockwise ` e are withdrawn through the ,discharge pipe I2. Thebeaters or agitators I8 and lßa are driven concentnates when it passes over the radial wall 45 by the motors 29 at customary speeds, for ex direction, the `cloth §46 is `substantially free lfrom 9 of the tank `5. As it travels alongin‘contact with the froth it accumulatesa layer 13 `of `con centrateswhich is initially very thin as shown in Figure 3. This layer gradually becomes thicker as the filter travels across the tank in contact` with the froth, attaining a substantially> greater thickness, as shown in Figure 4, by the time the ñlter Velement leaves the froth and passes over the ample 1800 R; P. M_f This produces the desired froth 40 at the top ofthe cell. i 1 The liquid level and supply of fresh pulp is maintained `by1‘auto matic regulators of known construction to `pro vide a constantly renewed froth of the desired density in contact with the filter cloth 46. The l i motor 55 is operated to rotate the, filter member , slowly to bring successively the various filter _seg ments into contact with the froth, carry them pared to concentrates recovered by conventional across the cell in contact with the froth and then methods', contain a relatively small percentage 55 move them away from the cell and overthe bin of water, are then blown and scraped from the I3." 'I'hrough the valve »mechanism, each seg cloth in its passage over the bin I3 so that the ment is connected to the vacuum or suction line t radial wall I0. The- concentrates, which as com cloth is substantially free from concentrates when it again reaches the entry side of the tank. In these figures, the layer of- concentrates is nec 60 essarily indicated diagrammatically, and the drawings are Anot intended to showy the relativeV thicknesses of the screen; the ñlter cloth and the layer; for the thickness of the layer of‘concen trates may vary` within reasonably wide limits, 65 while it isl over the flotation vcell and in contact ywith the >froth and each segment is connected `with the source of pressure as it is over the binV I3 and approaching the scraper 10. Thus the minerals are gathered on the underside of the filter cloth as the segments pass `over the cell and discharged from the filter cloth by the action of the pressure and by the scraper 10 as the filter depending upon the speed of operation, tough# segments pass over the bin. `'I'he speed. of rota ness of the` bubble film, amount of suction, the tionof the filter is correlated with the density nature of the materials being handled in the cell, of the froth and the‘concentration of valuable the fiotationoils or reagents, and other factors. 70 minerals therein-to obtain a coating or cake of Figures 3 and 4 with Figure 5 also illustrate concentrates of the vdesired thickness on the a preferred'arrangement for preventing loss of the froth and overflowing of the flotation een. ’I'his is preferably accomplished by mounting a ñexible rubber ñange member `1l on the radial underside of the cloth. f The `thickness of the ` layer or cake may` vary within reasonablywide limits, but it should notbe so great that the layer will crackand fallback into the iiotation cell. '9,411,988 7 Anor should it be great enough to l"„irevent or sub ~ upper eide ef the portion of the filter in >tenerci stantially impair the dewatering action of the with the froth thereby causing concentrates con- 2 ' tained in the froth to adhere to the underside filter, for `the method and apparatus are prefer . ably operated vto produce concentrates of excep ofthe filter, continuously removing the filter from tionally low moisture content'. rThe speed of o_p 5 the froth and applying gas under pressure'toV thev ` erationv of the' filter may correspondïgenerally upper side'oftlie portion thereof out of contact , with the speed‘of operation of conventional >cy-v with the fr0-th> te ‘discharge the eencentratee » ’ lindrical filters, for example >speeds offene or'two revolutions per minute maybe employed. A vac-V 4. The method of removing heavier than water uumof from 1.7 to 20 inches of vmercury is> prefer 10 mineral concentrates from a flotation cell wherein ably applied to _the filter when thin’pulps are'em the `concentrates are contained in >froth atfthe ,i ploye‘d, and >this may be'inc'reased -to'from 20V to , top ofthe cell, which comprises moving a con `25j` inches 'of mercury with >denser pulps. ’ Pres tinuous filter element in a path suchv that during ‘ ` sure' up toV 7 to-15 pounds -per square inch may be ’ aplied on the ‘pressure side oifthe cycle to'fblow the'pulp offthe filter cloth intothe bin. ' From the foregoingv description --of af- preferred therefrom. , e , ~ . a'portion of its travel its lower surface is lin con 15 'form ofv my invention, it will befseen‘ that by my tact with the froth in the cell and durîngranother' portion is ‘out of contact with the froth, applying suction to the upper surface of that portion of the , . filter element in contact with the> froth thereby i method the usual‘foperations of skimming the `causing concentrates to accumulate on the lower - concentrates 'from the top of ‘a flotation cell then 20 surface in contact with the froth, the movement diluting the concentrates With water and pump-> of the filter" element lcarrying the accumulated ` ing them to thickeners and fllters'where the water `conc'entrates away from the froth, and‘removing Y is removed ' and the concentrates recovered, to ~ the accumulated concentratesduring theportion of travel of the> element in which 'the element is gether'with the various items of equipment nec essary to-carry out these operatidns, are all; elim inated.>> Thus-my method effects a substantial 25 out of contact withthe froth." ’ ` . ` . . 5. Apparatus> for lrecovering concentrates from saving in the investment required to recover con a'flotation cell wherein the concentrates are ,con centrates from' flotation cells and operates to re tained in froth at the topL of the cell, comprising, in combination with the flotation cell, a round . V'cover .concentrates from such cells with greater >efficiency,> lower moisture content and at lower 30 filter mounted for rotation about a vertical'axis Y . " costthan- has heretofore been possible. My pre ferred' apparatus for carrying'out my method is >and positioned to have one portion disposed over . relatively simple and'compact and can be manu factured Aand/operated at reasonable cost.' ‘ l with froth in said cell and another portion spaced away from the cell, means for applying'suction to the cell with its lower surface adapted to` contact Various changes andi-modifications can be made 35 the portion of the filter adapted to contactQthe in my invention both as to method and apparatus froth whereby concentrates may be yaccumu ~ without departing from the spirit andscope there lated thereon, means for removing laccumulated concentrates froma portion of the 'filter' spaced .of.`y "Therefore,> it isto be understood that the foregoing description of my method and appa away from the cell, and means for rotating said »'Íratus’ is given by way of- example and not limi 40 filteniwhereby concentrates may be continuously tation,v and Vthatmy patent >is not` limited vtofthe preferred' form disclosed hereinor inany man accumulated on said filter and ‘continuously re moved‘therefrom. .nerlfother vthan by ythe scope ofA the appended - Y claims. . Iclalm: 1.,The methodlof ., recovering" heavierthan water ' ` , , T6. Apparatus for recovering concentrates from fa notation' cell wherein the `concentrates are con tained- in froth at the topof the cell, comprising, in combination with the ñotatlon cell, a roun:i,_l substantially plane filter of. greater larea than >mineral concentrates >from a concentrate-con ytaining'froth produced `by va flotation cell, which the cell mounted for rotation about a vertical axis and positioned to have one vportion disposed over ' comprisesplacing a` permeable filter with its lowersurface in contact with the undiluted froth, 5U thecell with its lower surface adapted to contact 'with froth in said cell and another portion spaced . applying suction to the upper side of the filter away from'the cell, sealing means mounted'on the thereby causing concentrates `contained inwthe walls of thev cell and engaging the under surface froth to» adhere to -‘the underside of the filter, thereafter removing the filter from the vfroth and of said-filter for ‘preventing substantial overflow applying gas under pressure lto the upper sideof 5;, of froth and liquid‘frorn said cell, lmeans for 'ap the filter to discharge the concentrates therefrom. i 2. The method of removing heavier than water mineral concentrates from a flotation cell where in the concentrates are containedin froth at the topl ofr the cell, which comprises placing aper plying suction to the portion of the filterr adapted >to contact the froth whereby concentrates may be` accumulated thereon, means for removing accu» mulated concentrates from a portion- of the filter 6U spaced away from the cell, and means for rotat ing said filter, whereby concentrates ‘may’ be con' tinuously accumulated on said filter andA >con With` the froth at the top of the cell and »above ' tinuously removed therefrom; H, ‘ the level of „the liquid therein, applying suction to the upper side of the filter -thereby causing con 7. Apparatus for recovering concentratesfrom centrates contained in the froth «to adhere to the 65 a flotation cell wherein the concentrates`VV are con underside of the filter, thereafter removing` the> ` tained in froth at the top` of- the cell, comprising, Íin combination ywith ,the flotation cell, a round filter from the froth and removing the accumu meable filter with its lower surface `in contact ' lated concentrates therefrom. _ ì . filter` mounted for rotation about :a vertical axis and positioned to haveone portion disposed over 3. The method of‘removing heavier thanl water mineral concentrates froma flotation cell wherein 70 the-cell with its lower surface adapted to contact the concentrates,arecontained in the froth at the with froth in said cell and another portion spaced top of the cell, which comprises continuously'mov away Vfrom the cell, sealing means mounted on thek ing a permeable filter into contact with the froth walls ofthe cell and engagingthe'under surface in the cell, with the filter ldisposed in a, substan of said iilterfor preventing» substantial overflow tially .horizontal- plane. applying suction `to the 75 of froth and liquid from saidcelLmeans for apply 2,411,2ss 10 ing suction to the portion- of the filter adapted to ‘contact the froth whereby concentrates may be accumulated thereon, means for applying pres froth therein, `while another portion is disposed over said bin, radial partition members dividing sure to a portion of the ñlter spaced away from the -celi to remove accumulated concentrates mental filter elements, means for rotating said filter member to pass said segmental filter ele-` ments successively over said tank and said bin, valve means for successively connecting said illter therefrom, and means for rotating said filter, whereby concentrates may be continuously ac cumulated on` said filter and continuously re moved therefrom.` . 8. Apparatus for recovering concentrates from ores, comprising a flotation cell comprising a tank having means for creating a concentrate-contain ing froth on the surface of pulp within the tank, a bin, an annular iilter member mounted for rota said annular member into a plurality of seg elements to a source of suction when they are over said tank `whereby concentrates _are accumu lated thereon as said elements pass over said tank, and means for removing said concentrates from said elements and discharging said concen-~ trates into said bin. ` ~ ~ ` c 11. Apparatus for recovering concentrates from tion about a vertical axis, said filter member 15 ores, comprising a flotation cell comprising an comprising an annularchamber having a lower arcuate tank having means for` creating a concen ` surface of filter material, a portion of which is trate containing froth on the surface of pulp disposed over said tank and adapted to contact within the tank, said tank extending for approxi froth therein, while another portion is disposed mately 180°` of arc, an arcuate bin concentric with over said bin, -radial partition members dividing 20 the tank and extending for the remainder of the said annular member into aV plurality of seg circular arc of the tank, an annular filter member mental filter elements, means for rotating said concentric with said tank and bin and mounted filter member to pass said segmental filter ele for rotation about a central vertical axis, said ments successively over said tank and said bin, illter member comprising an annular'V chamber and‘valve means for successively connecting said 25 having a lower surface of filter material, a por filter elements to a source of suction when they tion of which is disposed over said tank and are over said tank and to a source of pressure adapted to contact froth therein, while the re when they are over said bin. mainder is disposed over said bin, radial parti 9. Apparatus for recovering concentrates from tion members dividing said annular member into ores, comprising a flotation cell comprising a tank 30 a plurality of segmental ñlter elements, means for` having means for creating a concentrate con rotating said filter member to pass said segmental taining froth on the surface of pulp within the iilter elements successively over said. tank _and tank, a bin, an annular ?lter member mounted said bin, and valve means-for successively con for rotation about a vertical axis, said filter mem necting said filter ‘elements to a source of suction ber comprising an annular chamber having a 35 when they are over said tank and to a source of lower surface of filter material, a portion of which is disposed over said tankand adapted to contact froth'therein, while another portion is disposed over‘said bin, radial partition `members dividing said annular member into a plurality of seg , mental filter elements, means for rotating said .filter member to pass said segmental filter ele ments successively over said tank and said bin, and valve means for successively connecting said filter elements to a source of suction when they are over said tank. e pressure when they are over said bin. l c e 12. In combination with a flotation cell having >means for creating a froth containing heavier ,Y than water mineral concentrates on the surface of the pulp within the cell, apparatus for recover ing said concentrates from said froth comprising a rotatably mounted round iilter positioned to have one portion disposed with its lower surfacel adapted to contact undiluted froth, and another portion spaced away fromthe froth, :means for l , applying suction to the portion of the filter - adapted to contact the `froth whereby concen trates 'may be accumulated on the under surface arcuate tank having means for creating a con thereof, means for applying gas pressure to a centrate containing froth on the surface of pulp 50 portion of the filter spaced away from the froth ‘ 10. Apparatus for recovering concentrates from ores, comprising a flotation cell comprising an \ within the tank,f a bin, an annular filter member concentric with said tank and mounted for rota tion about a central vertical axis, said ñlter mem ber comprising an annular chamber Vhaving a lower. surface of filter material, a portion of which 55 is ydisposed over said tank and adapted to contact to remove accumulated concentrates therefrom. and means for rotating said'filter, whereby con centrates may be continuously accumulated on said ñlter and continuously removed therefrom.V ALBERT REYNOLDS MORSE.