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Патент USA US2410326

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@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.
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