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Патент USA US2411288

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Nov. 19, 1946.
.Filed uar‘çh 26, 1945
\ f 2 sheets-sheet `1
A Trop/vn; .
Nov. 19, 1946.
Filed March 2e, 1945
2 sheets-sheet `2
Patented Nov. i9, 1946
N _l is 2,411,288 i "
l ab _Albert Reynolds Morse, Shaker Heights, Ohio
,l ` "Application March 26, 1345„s7ena1no. 584,918
`112 claims.
"I'his invention-relates to "a method and appa
‘ 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 ,
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
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;`
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
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,
illustrating a preferred form ofbvalve` `plate
and ismoved through a path lsuch ¿that each ` for* controlling
4the application
ï of suction and
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
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
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.
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
59a may be provided to reduce leakage between
the valveplate 60 and plate45.
- »
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>
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
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.
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
a'portion of its travel its lower surface is lin con
'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
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
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
.nerlfother vthan by ythe scope ofA the appended - Y
. 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.
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
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.
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
, 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
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