April 15 , 1924.
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_
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1,490,420
R. B. ELDER
HYDRAULIC CLASSIFIER
Filed June. 20; 1918
5 Shaw-Sheet 3
1,49Q420
April 15 , 1924,
R. B. ELDER
HYDRAULIC CLASSIFIER
Filed June 20, 1918
3 Sheets-Sheet 2
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WITNESSES
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ATTORNEYS
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April 15 , 1924.
R. B. ELDER
1,490,420
HYDRAULIC cLAss-IFIER
Filed June 20 , 1918
3 ‘Sheets-Sheet 5
WITNESSES
94,
A TTORNEYS
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@FFECE,
RQBERT BAXTER ELDER, 0E UNSANKINKO, CHOSEN, JAPAN, ASSIGNOR ‘1'0 ANDREW
DARWIN ELDER, 01‘ DENVER, COLORADO.
HYDRAULIC CLASSIFIER.
Application ?led June 20, 1918. Serial No. 240,997.
To all whom it may concern :
Figure 6 is av plan view;
.
Figures 7, 8 and 9 are sections on the lines
. Be it known that I, Ronna'r BAXTER
ELDER, a citizen of the United States, and a 7~—7, 8—8 and 9-9, respectively, of Fig;
resident of UnsankinkoyChosem, Japan, have
5
ments in Hydraulic Classi?ers, of which the
following is a speci?cation.
10
ure 6;
-
of Figure 5.
-
In the embodiment of the invention shown
. '
My invention‘ is an improvement in hy in Figures 1 and 2, acasing is provided hav
draulic classi?ers, and has for its object to ing its enclosing walls at the bottom perpen
60
bers, the latter communicating with the A partition 4 is arranged in the bottom of
teeter chamber by a- restricted opening and the casing, the said partition inclining
the former by. a number of openings, and downwardly from the inlet toward the out
65
provide a device ofthe character speci?ed, dicular, as indicated at 1, and ?aring above
wherein a teeter chamber is provided, ar the perpendicular portion, as indicated at
ranged above hydraulic and discharge cham 2, where they connect with the launder 3.
wherein a stand pipe having an over?ow is
let end of the casing, andthe said partition
provided-in connection with the discharge is between the perpendicular walls of the
casing.
>
chamber.
‘
Another partition 5 is arranged between
A further-object is to provide a means for
20
bution of the water to all portions of ‘the
teeter chamber and so to prevent the for
mation of banks of sand in any portion
thereo?and to maintain a uniform liquid
bed of pulp over the entire teeter chamber
iydraulic chamber 6 and a discharge 75
chamber 7, and a delivery valve or spigot 8
leads from the discharge chamber. This
ber.
A further object is to provide a device of
40
mg below the partition 4 into two chambers,
a
‘
or guess of operating attendants. >
3
ing at the outlet end of the casing, and this
partition 5 divides that portion of the cas
discharge chamber communicates with the
A further object is to provide a simple space in the casing above the partition which
means for regulating the flow of water to the is the pulp chamber, and a series of open
teeter chamber so that the regulation may be ings 9 is provided in the partition 4 for fur
made and established correctly and there nishing a means of communication between
after will not be dependent on the judgment the hydraulic chamber and the pulp cham
area.
30
70
introducing water into a teeter chamber in the partition 4 and the bottom of the cas-.
such a manner as to maintain‘ even distri
25
55
Figure 10 is a section on the-line 10——.10
invented certain new and useful Improve
80
_
Drain valves 10 are provided in the bot
85
the character speci?ed wherein the discharge tom of the casing for draining the hydrau
of the heavy classi?ed pulp from the teeter lic chamber, and water is furnished to the
chamber depends on the thickness and den chamber by a pipe 11 which is controlled by
sity of the bed of pulp in the teeter chamber. a valve 12. A stand pipe 13 is provided at
one side of the casing, the said pipe extend
In the drawings:
’
.,
Figure 1 is a longitudinal section, show ing from the bottom of the casing to above
ing the improvement applied to a single the top of the launder, the bottom of this
pipe being connected with the discharge
pocket classi?er of the launder type;
Figure '2 is a section on the line 2-2 of chamber, as shown, and this pipe has a dis
Figure 1;
‘
Figure 3 is a vertical section of the im
provement applied as a cone classi?er;
charge opening 14; above the pulp level
M)
95
through. which the water may ?ow on to the
pulp in the launder. A pipe 15 communi
cates
with the bottom of the stand pipe by
Figure 4 is a longitudinal section showing
the improvement.applied as a .four spigot means of which water may be supplied to
the pipe to maintain the water level at the
classi?er;
.
Figure 5 is a front view of another em overflow, opening 14, and a valve 16 is ar
bodiment of the invention;
ranged in the pipe for’controllin?r the same.
100
'
1,490,420
In the embodiment of the invention shown
Water is supplied by a water pip: 42 to
in Figure 3 the casing has the portion 17 the hydraulic chambers, each cham I‘ hav
with perpendicular walls and the portion ing its supply- inpedendent of the other
18 with ?aring walls, and the over?ow chamber.
5 launder 19 is arranged near the top of the
The operation of all. of the embodiments
casing in a manner to receive the over?ow is the same, each being a hindered settlin
10'
from the casing. A feed cone 20 is arranged hydraulic classi?er, for classifying crushed
centrally of the casing at the top, and the ore, preparatory to treating it on‘ Wil?ey
stand pipe 21 extends upwardly from near tables or other concentrators designed to
the bottom of the casing to above the top separate the valuble minerals from the
_ of the feed cone. Here the stand pipe is gangue. The device consists essentially of
provided with a discharge spout 22 dis the following parts, namely, a teeter chams
charging into the cone, and with a supply ber wherein the ore pulp is thickened to a
pipe‘ 23 for maintaining the level of water condition of hindered settling, and this con
15 1n the stand pipe. This pipe 23 is controlled
dition maintained; second, means for bring
by a valve 24 and the pulp is fed to the in‘gthe unclassi?ed pulp over the teeter
75
80
feed cone by a‘ feed launder 25. A partition chamber in order that the ore particles may
26 is arranged near the bottom of the cas
20
have a chance to sink into the teetering mass
ing the said partition dividing the casing or be crowded out by heavier articles, as
into an upper teeter chamber and a lower the case may be, with means ?dr carryin
portion which is sub-divided by partition away the lighter portions of the pulp whiclgi
27 into a hydraulic chamber and a dischage could not sink into the teeter chamber;
25
chamber, the lower end of the stand pipe third, means for introducing hydraulic
communicating with the discharge chamber. water into the teeter chamber through small
‘The partition 26 inclines downwardly to
ward the center of the casing, and it is pro
vided with openings 28 forming a communi
holes in the bottom thereof and in such a 90
way as to maintain uniform hindered set
tling conditions over the entire area of the
’ cation‘between the teeter chamber and the teeter chamber, and as not to allow parti
30
hydraulic chamber. The discharge chamber 0185 of ore to settle out of the teeter cham
communicates with ‘the teeter chamber‘ and ber against the incoming hydraulic water;
a discharge ‘valve 29 leads from the dis fourth, means for discharging the heavy
95
‘ charge chamber. Drain valves 30 are pro" classi?ed pulp from the teeter chamber, at‘
vided in the'hyd'raulic chamber, and water
is supplied by means of a pipe 31.
~’, ,Intheenibo'diment‘of the invention. shown
Figuredgithe vcasing has the portion 31
or near the bottom, and into a discharge
chamber wherein the hydrostatic pressure is
regulated independently of the hydraulic
plwithfverticali wallsacnd the portion 32' with means for. maintaining constant or nearly
,‘? ing-walls which connect with’ the launder so the hydraulic pressure in the discharge
33.,; jfl‘helowerportion ofthe casing is di chamber; and, sixth, means for introducing
?l4ofvidzed'fby “verticalp'a'rtitions 34 into four waterlinto
the discharge chamber and inde
\fpocketaandan inclined partition 35 sepa pendently of the water introduced into the
l'rates each‘ pocketinto a lower portion and
Fan: upper portion. ', These partitions 35 in
The problem of making a successful hin
teeter chamber.
45
100
water which does the classifying; ?fth,
‘
'
‘
105
'
, cline downwardly toward the discharge end dered settling classi?er may be resolved into
off'the casing-fend a .partition 36 separates two parts; ?rst, to produce and maintain
each lower portion into a hydraulic chamber ' uniform hindered settling conditions over
110
and-a discharge chamber. The partitions ‘35 the entire teeter chamber area; second, to
60
have openings 37 correspcinding to the open-' discharge the products of classi?cation sep
ings 9 and 28, and a discharge valve 38 leads arate from each other and as fast as they
from each discharge chamber. Each hyare
formed. ‘
-
,
draulic chamber has-Ldrain valves 39, and a
115
In order that there may be uniform hin
standpipe 40 leads upwardly from each (lis-v dered settling? conditions over the ventire
charge chamber to abovethe level of the top area of the teeter chamber it is necessary
of the launder. These vvstand pipes 405£have that there be a slowly upward moving cur
over?ow outlets 41' corres onding to the out rent of water uniform_or nearly so over the
lets 14 and‘22, and it will be noticed from entire area. ‘The hydraulic water enters the 120
an ‘inspection of Figure 4 that the said open teeter chamber from the hydraulic chamber
ings are of lessheight above the bottom of through the constriction openings 9, 28 and ‘
the casing at the discharge end of the laun 37 in the partition which separates these
der than at the inlet end, that is, the stand chambers, and as it enters the teeter cham~ 125
pipe 40 “at the inletv end has its over?ow ber it is in the form of jets. These jets ,
opening at alhigher level vthan the remain spread out as the water'amoves upward and
:mg openings, and they are gradually’ “mingles with the'pulp, and the ‘result is
stepped downwardlyirom the inlet to the that a short distance above the bottom of
Outlet end of the casing.
'
the teeter chamber the hydraulic ‘water is
1,490,430
di?used uniformly into the pulp and forms height »_of the column of water. The cross
the desired slowly upward moving current sectional area of the column and its con
of water practically uniform over the en-j nection must be large enough so that the
tire teeter chamber area. The lowest por friction head of a small amount of water
tion of the teeter chamber space is not passing through them will be negligible.
10
15
20
available for the sorting action of the classi . The height of the over?ow of the column
?cation but is necessary to allow the jets is then made such that the hydraulic pres
of water to become mingled‘ with the body sure maintained at the opening between the
of the pulp. The depth re uired to accom teeter and discharge chambers is equal to
plish this depends on the istance between the hydraulic pressure due to a column of
the constriction openings and the velocity of pulp, the height of the teeter chamber and
the water in the jets. The nearer the holes of the density desired to be maintained in
are placed and the smaller the velocity of the teeter chamber plus the column of less
the incoming water the less depth is re-' dense pulp above'the top of the teeter cham DU,
ber. The density of the pulp» above the top
quired for thedi?'usion to take place.
The essential function of the ‘constriction of the teeter chamber will remain practi
plate or partition which separates the teeter cally constant, so that it is evident that
and hydraulic chambers is to maintain the under the conditions described, whether '
even distribution of the hydraulic water there is a movement of liquid from the dis
over the teeter chamber area.. This it does charge chamber into the teeter chamber or
by o?'ering tothe ?ow of hydraulic water in the opposite direction will depend on the
such a reslstance that the inequalities tend
density of the pulp in the teeter chamber.
ing to form in the weight of thepulp bed If this density exceeds the amount neces
25
30
at di?’erent points have no appreciable ef sary to balance the’ constant hydraulic pres
feet on the ?ow of water. The bed just sure in the discharge chamber. there will be‘
over and adjacent to the point where the a movement from the teeter chamber into
heavy classi?ed material is discharged from the discharge chamber. The movement
the teeter chamber tends to become lighter from the teeter chamber into the ‘discharge
since here it is continuously removed, and chamber will thin the pulp in the teeter
90
the bed just under the point where'theun chamber until equilibrium is again restored.
classi?ed pulp is fed to the teeter chamber The movement of the water into the teeter
chamber from the discharge chamber will
ticles are continuously added at this point. hinder the particles from leaving'the teeter
In passing from the hydraulic water cham chamber so that the density of the pulp in‘
her to the topof the pulp bed the hydraulic the teeter chamber will be thereby increased, IOU
water meets with resistance?rst from the and this Will continue untilequilibrium is
constriction plate and then from the pulp again restored. In this way the density of
bed. The resistance offered by the constric‘ the pulp in the teeter chamber will be kept
tion plate must be great enough so that practically constant, rovided only that the
slight variations in the resistance oiiered at area of the opening etween the teeter‘ and 105:1v
tends to become heavier, as heavy ore par
40
different points in the pulp bed do not ma
terially e?ect the distribution of water over
the teeter chamber area, andeat ,the same
time it must not be so great that the velocity
of the incoming jets is so great as to require
. "an undue depth in the pulp bed before they
become di?’used into the pulp. When the
50
the discharge chambers is equal to or less
than the area through which the coarse ore
‘particles in the pulp being treated will pass
simply by free settling, and without a movement of liquid either way, and provided,
also, that this opening is‘ not so small'but
what a slight increase of density of the pulp
.110
resistance offered by the constriction plate will produce movement enough to discharge
is great enough to‘ maintain the proper dis the pulp as fast as it is formed by the ore
1.15
tribution of i the hydraulic water, as de particles vfed to the teeter chamber.
In
practice,
the
area
of
this
opening,,that
scribed, the velocity of the incoming jets of
water will be great enough so that no ore is, the opening between the teeter and dis
particle can settle through the constriction charge chambers,-should be something less
as
openingsagainst the entering current of
water.
than the area which will discharge the par
ticles b-y freesettling, say, for instance, half 120
The discharge of the heavy classi?ed pulp such area. Then the density of the pulp
is regulated by controlling the hydraulic in the teeter chamber will increase until
‘ pressure in the discharge chamber. In prac
a steady stream of pulp‘ is discharged into
tice, if‘su?icient water is permitted to ?ow; the discharge chamber, at a velocity equal to
into the discharge chamber, so that a little twice the average, free. settling velocity of
over?ows the top of the standing column or the particles; In' this way the _-machine will
stand pipe the hydraulic pressure will be carry one-half its rated load or a; large overmaintained-practically constant at the open load, and stillgive perfect hindered settling,
ing between the teeter chamber and-tthe dis provided that the area of the teeter chamber
charge chamber and will be ?xed ‘by the is large enough for the overload.
125
~
‘
‘ ~
130
1,490,420
The operation of allthe- embodiments is ings 68 are adjacent'to the pipes 60 which
the feed water from the spigots to the
‘The ‘pulp ‘is maintained‘at a. predeter lead
hydraulic chambers. ‘ A screen 71 is ar
- the same.
._
,
.
_
mined level, as shown by .the ‘dotted lines ranged between the . feed water chamber
inFi‘gures 1, 2 and 4, and’ the lighter pulp
and the spigots, to prevent the pas.
passes away through the launder. The proper
sage of sediment. Spigots 72 lead from the
heavier pulp is- held in the teeter chamber
in a condition for hindered settling, by the
up-?ow of the water through the openings
10 9. ‘A constant hydrostatic pressure is main
tained in the discharge chamber and there
_.will be a passage of the pulp into the dis
Echarge chamber if there is the proper den
sity of pulp in the teeter chamber. If this
15
density exceeds the amount necessary to bal
70
bottom of the discharge chambers 50 and
‘51 to deliver, the pulp, and each hydraulic
chamber is provided with a drain pipe 73, -
normally closed by a cap 74. These ‘caps
maybe removed to drain the hydraulic
75
chambers. As shown, the hydraulic cham
bers are casings arranged in, the bOttom of
the pulp chambers, the to of each casing
being perforated to form t e perforate par
' .ance the pressure in the discharge chamber tition. Operripgs 75 are provided at each
there will be movement from the teeter pulp chamber, eaclropeni'n‘g ‘being closed by
80
chamber into the discharge chamber, while a transparent plate-'36, ‘as, for instance, a
if the density is less than the amount nec
essary to balance the pressure in the dis
plate of glass, to permit the contents of the
chamber to be inspected. '
>
charge chamber there willl be movement in , In operatiom'the water supplied to the
the opposite direction. From the discharge feed water. chamber 56 is in exe-cess of that
‘ chamber the pulp passes through the valves which can pass through the spigots 59, and‘
8,‘ 29 and_.38 for further treatment.
the. excess ?ows ever the partition 64 through
25” The embodiment of the invention shown the
passages 65 and 66 and .the opening
in Figures 5 to 10, inclusive, is characterized 67 into the first dischargechamber
50. The
by the addition of a feed water chamber chamber 50 is the discharge column and dis
arranged above the classi?er and from ‘which charge chamber regulating the dischar' e of
all the water used by the classi?er is de pulp
from the ?rst or adjacent teeter c 1am~
30
rived. In the said embodiment of the in ber 62. “The over?ow from this discharge 95
vention two discharge chambers 50 and'51 column or chamber is by way of the parti_
are provided, separated from
each _ other by I
85
a partition 52, and the- chamber 51 is sepa
rated from the waste chamber 53 by a parti
tion 54 and from the chamber 53 leads a
tion 52 separating the discharge chambers,
and the chamber 51 is the discharge column ’
of the second teeter‘chamber. The water
coming through the; opening 67 supplies
‘ waste pipe 55. The water is fed into the what is needed for the spigot 72 of the
40
feed water chamber 56 which is above the chamber 50, the excess of water over?ow
discharge chambers, and to which water is ing the partition 52, as above stated, for
delivered from a pipe‘ 57 having a valve supplying the spigot 72 of the chamber
58 ' for controlling the ?ow of the water. 51, from which ?ows the pulp delivered
'Spigots 59 lead from the feed water cham-' by the said chamber 51 from the second
her and deliver to pipes 60, which pass teeter chamber 62. The ?nal execess of
100
105
downward through the discharge chambers,
50
water over?ows the partition 54 and runs to
delivering to the hydraulic chambers 61, one waste
through the pipe 55.
of ‘which is arranged beneath each pulp or
The essential function of the feed water
teeter chamber 62, of which there are two, chamber'56 and the spigots 59 leading there
corresponding to the number of discharge, from is to furnish a means whereby the
chambers and number of hydraulic cham amount of water running to the teeter cham
bers. Each teeter or pulp chamber '62‘ is bers may be accurately adjusted ,to the cor
separated ~ from the adJacent hydraulic rect amount when the classi?er is ?rst put
chamber by a partition 63 having openings into
use, and this amount of water may
for permitting the water to ?ow from the
I10
115
thereafter be continuously furnished to each
hydraulic chamber to the teeter or pulp teeter chamber without the necessity for re
.chamber. The excess water from the feed adjusting the Water except to see that‘ the
55
chamber 56 over andv above that passing required level of water is maintained in
120 .
through the spigots 59, ?ows over the end 64 the
feed water chamber. In the construc
of the feed water chamber into a passage 65, tion which I show,‘ the level ofthe water
which opens into‘a passage 66 communicat in the feed water chamber is maintained
ing with the discharge chamber 50 through at
the desired point by providing thefeed
at' an
opening 67. Each discharge column or water
with \an overflow, but it is ias
chamber communicates with the adjacent obviouschamber
that any means for maintaining this
pulp chamber through an opening 68, whose water level would be equally as effective, ‘as,
extent may be varied by means of a valve for instance, a feed water chamber having
or gate 69, mounted to'slide in guides-7O no over?ow and having the valve 58 con
on the chamber wall. These'ports or open trolled by a ?oat in the chamber 56, so that
1,490,420
the water in the said chamber 56 would be chamber and having a valved communica
maintained at a constant level. “With this tion therewith, means for maintaining a pre
construction another water supply for the determined hydrostatic pressure in the dis
discharge chambers 50 and 51 would be pro charge chamber, a feed water chamber above
videdI' This construction would not be a the ‘pulp chamber and communicating with
departure from the spirit of my invention, the hydraulic chamber.
3. In a device of the character described,
but _I_ prefer the construction which I show
a
teeter
chamber, a hydraulic chamber there .
in the drawings as it requires only one water
beneath and separated therefrom by a par
supply.
It will be noticed that the top of the pipe tition through which highly restricted open
60 is high enough above the level of the ings are formed, means for supplying water
pulp-in the pulp chambers, which is indi through the partition to the teeter chamber '
cated by the dotted lines oi.’ Figures 9 and in ‘such a quantity that a predetermined
10, so that the water may rise in the said pressure head may be maintained across the
pipe high enough to force itself into the partition to effect even distribution of the
teeter chamber against any bed of pulp water to all parts of the teeter chamber, which can “form therein, and this insures at means for supplying unclassi?ed pulp to the all times a constant feed of Water to do teeter chamber, means for regulating the dis
15
‘the classifying, the amount being determined charge of classi?ed pulp therefrom and
by the size of the spigots 59 and the head means controlled by'the changing of pulp
of water maintained in the feed water cham
ber, and independent of the density of the
density for regulating the discharge of pulp
from the teeter chamber.
'\-
I
4. In a device of the character described,
'71 prevents any solid matter from ?nding a teeter chamber in all parts of which a 90
unitorm‘hindered settling bed of pulp is
25 its way into the sp-igots and thence to the
by water entering the teeter
hydraulic Water chambers, where" it might maintained
stop the restricted openings in the parti chamber through numerous restricted open
ings in the bottom thereof and under su?i
tion 63.
_
‘In use, the unclassi?ed pulp is fed into the cient pressure to overcome the tendency of 95
pulp bed in the teeter chambers. The screen
extension 77 at the front of the classi?er, the pulp to form a bank or solid mass upon
from whence it ?ows into" the ?rst teeter the bottom of the teeter chamber, and means
chamber 62. The pulp rejected by the?rst in connection therewith and controlled by
teeter chamber ?ows to the second teeter the changing of the pulp ,densit , whereby
chamber, passing over the partition 7 8 which the discharge of the heavy classi ed portion
will be effected.
separates the two chambers, and the lightest of 5.theInpulp
a
device
of the character speci?ed,
particles which are rejected by the second
teeter chamber are contained in‘ the pulp a teeter chamber, means for supplying
which ?ows over the partition 79 between hydraulic'water to produce hindered set
the second pulp chamber and the outlet 82. tling classi?cation therein, means for main
taining the even distribution of the h draulic
_ll claim:
40
1. A device of the character speci?ed, waterv over the teeter chamber area y forc
comprising a casing, an inclined transverse ing it to enter the teeter chamber through
30
100
partition near the bottom of the casing, an numerous small openings distributed over
approximately vertical partition between the the bottom of the tester chamber, the said
transverse partition and the bottom, said openings being so restricted that they form
partitions dividing the easing into an up enough resistance to the passage of the water
er ulp or, teeter chamber and lower hy that the distribution of thewater is thereby
105
110
maintained regardless of slight inequalities
rau ic and discharge chambers, means for
i. supplying water under pressure to the hy in the weight of the pulp bed at different 115
points in the teeter chamber, and means
50 draulic cham er, a discharge valve for the
discharge chamber, a stand pipe communicat in connection therewith. and controlled by
changing of the pulp density for regulat
ing with the dischargephamber and extend-1 the
ing
the discharge of the heavy classi?ed
vthe
pulp
level'in
the
pulp
chamber‘
ing above
portion
of the pulp therefrom. A
_
‘ and having an over?ow above the said level,
the discharge chamber commimicating with 6. In a device of thecharacter speci?ed,
a teeter chamber, a discharge chamber with
thepulp chamber by arestricted opening, the i which
the ‘teeter chamber communicates by
120
- inclined transverse partition having open
ings for permitting the water to flow from a restricted‘ opening, means for supplying '
the hydraulic chamber to the pulp chamber, water under pressure to the bottom/of thev
60
65
and means for delivering 'ulp to the casing; teeter chamber to produce hindered settling ,125
2. In a device of the cliaracter specified, classi?cation therein, a stand pipe commu—
a pulp or teeter chamber, a hydraulic cham nicating with the discharge chamber and ex
ber below the pulp chamber and communi tending above the pulp level in the pulp
cating therewith by restricted openings, a chamber and having an over?ow above the 180
discharge , chamber adjacent to the pulp pulp level, and \ means for removing the
a
'
,420
heavy‘classi?ed material
from the discharge
‘chamber otherwise than through the stand clear water equal in hei ht to the. vertical
distance between the disc arge openin and
pipe connected thereto.
the surface of the pulp in the teeter 0 am;
_
In a device of the character speci?ed,
a series of pulp chambers, a hydraulic cham
ber below each pulp chamber and commu
her.
~
12. In a hvdraulic classi?er, a pulp cham
ber provide(. with feed and over?ow means
nicating therewith by restricted openin s, and
a perforated bottom, a hydraulic cham 70
a discharge column adjacent toeach pulp ber communicatin
with the pulp chamber
chamber and having a valved communica through
said
per
orated
bottom, and pro-.
tion therewith, a common feed water cham
vided with awater feed, a discharge cham
ber in direct communication with said pulp
chamber adjacent said perforated bottom a
pressure column inv communication w1th
ber communicating with each hydraulic
chamber, said feed water chamber having
an' over?ow leading to the discharge column
‘of
the ?rst teeter chamber, each discharge
15
75
column having an over?ow leading to the said discharage chamber and rovided with
an over?ow above the level of) the over?ow
succeeding discharge column.»
8. In a device of the character speci?ed, of the pulp chamber, and a water feed to
apulp or teeter chamber, a hydraulic cham said pressure column ‘independent of the 80
ber below the pulp chamber and communi water feed to' said hydraulic chamber.
13. In a hydraulic classi?er, a ulp cham
eating therewith b restricted openings, a
‘ dischar e column a jacent to the pulp cham ber provided with feed and over ow means,
a hydraulic chamber communicatin with
ber an having a restricted communication the
pulp chamber through a plur ity of'
85
' therewith, a feed water chamber above the
discharge chamber and communicating with smallapertures in the bottom of the pulp
' the hydraulic chamber, the feed water'cham chamber, a discharge chamber in communi
her having an over?ow leading to the dis cation with the pulp chamber adjacent its
char e column.
bottom, a pressure ‘column in communica
>
9. n a device-of the character speci?ed, tion with the discharge chamber and pro 90
a pulp or teeter chamber, a hydraulic cham vided with an over?ow above the level of
30 ber below the pulp chamber and communi the over?ow in the pulp chamber, and inde
cating therewith by restricted openings, 9. pendent water feeds to the hydraulic cham
' discharge ‘column adjacent to the teeter ber and to the discharge chamber pressure
chamber‘ and having a valved communica
14. In a hydraulic classi er, a plurality
tion therewith, a feed water chamber above
pulp chambers, each pro 'ded with feed
the discharge chamber and communicating ‘of
and over?ow means and a perforated bots
with the hydraulic chamber, the feed. water tom
and a hydraulic chamber on the other
chamber having an over?ow leading to the side ‘of
the said perforated bottom provided 100
' discharge column.
with
water
feed, .a discharge chamber in
10. A device of the_ character speci?ed,
comprising a casing having an n per pulp communication with each pulp chamber a
column.
*
'
press?re column in communication t with
chamber and lower discharge and ydraulic
each discharge chamber and provided with
chambers communicating with the pulp an
over?ow above the level of the over?ow
chamber, means for supplying water under
45
50
,
pressure to the hydraulic chamber, a stand of ‘its pulp chamber, and water feed means
tolthe pressure column independentof the
pipe communicating with the discharge water
feed to the hydraulic chamber.
chamb er, having an over?ow level above the '
15.
In
a hydraulic classi?er, a pulp cham
level of the pulp in the pul chamber and
?lled to this over?ow leve with nearly ber provided with feed and over?ow means
106 >
110
a perforated bottom, a'hydraulic cham
static clear water. and means for removing and on
the other sideI of the perforated bot- §
the classi?ed pulp from the discharge ber
tom and provided with water feed, a dis
chamber otherwise than through the stand charge chamber in communication withthe- _
P1139
11. In a device of the character-speci?ed, pulp chamber, a pressure column in com 115
munication with the discharge chamber and
- a teeter chamber, a hydraulic chamber be
neath the teeter chamber and communicat provided with an over?ow above the level '
the pulp chamber over?ow, and water ,
ing therewith by restricted opemngs, means '"of"
feed means .to the pressure column mde-w
for supplying water under pressure to the
hydraulic chamber, a discharge chamber pendent’ of the water feed to the hydraulic
chamber >communi~
60 'cates by a restricted opening, means for
ROBERT BAXTER ELDER. ,'
producing in the discharge chamber. at the
discharge opening a constant hydrostatic
A. 0.. Emma,
pressure-greater than that of a column of
chamber.
' with which the teeter
'
'
Witnesses:
>
_
Sm Pom; Hm.
~
.