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Патент USA US3070238

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Dec. 25, 1962
C. A. HOLLINGSWORTH
3,070,228
COUNTERFLOW HYDRO-DESLIMER
Filed March 10, 1961
2 Sheets-Sheet l
INVENTOR
CLINTON A. HOLLINGSWORTH
ATTORNEY
Dec. 25, 1962
c. A. HOLLINGSWORTH
3,070,228
COUNTERFLOW HYDRO-DESLIMER
Filed March 10 ,
2 Sheets-Sheet 2
1961
cmzj o .PODNE
INVENTOR
vCLINTON A. HOLLINGSWORTH
United States Patent 0
3,070,228
Patented Dec. 25, 1962
2
1
ment or admixture of slimes with the aqueous suspension
3,070,228
of larger particles of feed material withdrawn through
the discharge opening can be largely eliminated, if a posi
tive counter?ow action is established in the apparatus by
COUNTERFLOW HYDRO-DESLIMER
Clinton A. I-Iollingsworth, Lakeland, Fla., assignor to
Smith-Douglass Company, Incorporated, Norfolk, Va.,
increasing the velocity of the counter?owing upper layers
a corporation of Virginia
of the water so as to move the suspended slimes more
Filed Mar. 10, 1961, Ser. No. 94,921
rapidly from the discharge end toward the feed input end
of the apparatus. Moreover, I have found that this de
sired increase in velocity of the counterflowing upper
layers of liquid in the apparatus can be obtained by provid
ing a constriction in the trough-like container adjacent the
4 Claims. (Cl. 209-460)
This invention relates to hydro-deslimers, and more
particularly to an improved counter?ow hydro-deslimer.
When native ores and minerals are crushed or ground
to prepare these raw materials for subsequent treatment
discharge end of the apparatus and in addition one or
(e.g. froth ?otation) a quantity of very ?nely divided
particles of the material is inevitably formed. Moreover,
more constrictions in the main portion of the trough-like
container between the discharge and raw feed input ends
certain minerals such as Florida phosphate rock are found 15 thereof.
Accordingly, my improved counter?ow hydro
deslimer comprises an elongated trough-like container
in their native state admixed with large quantities of clay
and other very ?nely divided or colloidal particles.
having a raw feed input at one end of the trough and a
deslimed product outlet opening formed in the bottom of
the other end of the trough. The bottom wall is per
When these raw materials are mixed with water, the very
?nely divided particles form “slimes” which interfere with
subsequent operations and which, therefore, must be re
forated so that a multiplicity of streams of wash water
moved from the larger particles of the raw material. A
can flow upwardly therethrough into the trough, and means
number of devices have been developed to effect the re
are provided for supplying wash water to said perforated
moval of slimes from aqueous suspensions of slime, con
bottom wall. A slime discharge launder is disposed along
taining raw materials, and one of the most useful and
each upper longitudinal edge of the trough, and the trough
effective of these devices is the so-called hydro-deslimer. 25 is formed with a constricted portion adjacent the discharge
A conventional hydro-deslimer is a long trough-like
opening and preferably with at least one other constricted
container or receptacle full of water and having a raw
portion intermediate the raw feed inlet end and the de
feed input at one end of the trough and a deslimed prod
slimed product discharge end of the hydro-deslimer.
uct outlet opening in the bottom at the other end of the
My invention will be better understood from the follow
trough. The bottom of the trough is formed with a plural 30 ing description thereof in conjunction with the accom
ity of holes through each of which a stream of water ?ows
panying drawings of which
'
upwardly into the trough-like container. Raw feed mate
FIG. 1 is a perspective view of my new counterflow
rial (e.g. washed and screened phosphate rock) is intro
hydro-deslimer showing it empty of water and with a por
duced into one end of the water-?lled trough, additional
tion thereof partially cut away,
water being introduced into the trough through the plural 35
FIG. 2 is a sectional view along lines 2-2 of FIG. 1
ity of small holes in the bottom thereof. The raw feed
showing the counter?ow of liquid layers in the hydro-de
material ?ows along the bottom of the trough toward the
slimer, and
discharge opening at the opposite end thereof, and as the
FIG. 3 is a sectional view along lines 3—3 of FIG. 1
feed material ?ows toward the discharge opening the
showing the liquid containing the slimes over?owing into
water flowing upwardly into the trough through the holes 40 the slimes launder.
in the bottom thereof washes the slime particles from the
In the embodiment of my invention shown in the
larger particles of the feed material. The deslimed larger
drawings my new counter?ow hydro-deslimer comprises
particles of feed material continue to ?ow along the bot
an elongated trough-like open top container or receptacle
tom of the trough to the discharge end thereof where the
10 formed of sheet metal or the like and having a
deslimed material is discharged therefrom through the dis 45 truncated V~shaped cross-section (shown best in FIGS.
charge opening along with a portion of the Water con
1 and 3) throughout most of its length. One end of the
trough is adapted to receive the raw feed being intro
duced into the hydro-deslimer, and in the embodiment
shown in the drawings the raw feed input end of the
trough is provided with a sloping end wall 11 which
directs the raw feed material introduced into the trough
longitudinally toward the opposite or discharge end of
the trough. A baffle plate 12 is also provided to insure
that the introduction of raw feed material into the trough
tinuously being introduced into the trough. The slimes
removed from the larger particles of the feed material are
carried by the excess water ?owing upwardly and into a
slimes over?ow launder disposed about the upper edges of
the trough-like container. Thus the slimes flow generally
upwardly from the material being deslimed and outwardly
into the slimes launder, and there is little ?ow of the
slimes in the opposite direction to that of the material be
ing deslimed. By appropriate adjustment of weir levels
will not unduly disturb the counter?owing layers of water
in the main portion of the trough.
The bottom of the trough 10 is perforated or pierced
with a multiplicity of small holes 13 through which water
along the length of the over?ow launder it is possible to
cause the upper layers of the vwater in the hydro-deslimer
to ?ow in the opposite direction from that of the feed
material ?owing along the bottom of the deslimer toward
the discharge opening. However, the velocity of the
counter?owing upper layers of Water is relatively low and
can be introduced into the trough, and means are provided
60
the degree of counter?ow action obtained is limited and
relatively ineffective. Accordingly, conventional hydro
deslimers provide a simple and reasonably ef?cient means
for obtaining a substantially deslimed product. However,
it has sometimes been found ditlicult to obtain as com
pletely a deslimed product as is desired due to entrainment
or mixing of slimes with the water and deslimed product
being withdrawn from the apparatus through the dis
charge opening.
I have now found that the operation of hydro-deslimers
can be markedly improved, and the problem of entrain
65
for introducing water into the trough through the holes
formed in the perforated bottom wall. In the embodi
ment shown, the bottom of the trough is provided with a
perforated inner bottom wall 14 and an imperforate outer
bottom wall 15 which, together with side panels 16 and
end panels 17, comprises a water supply manifold 18.
Water is introduced into the manifold 18 through a plu
rality of Water pipes 20 and from thence ?ows upwardly
into the trough through the perforations 13 in the inner
bottom wall 14, as indicated by the upwardly directed
70 arrows extending from the inner bottom wall in FIGS.
2 and ,3 of the drawing. The hydro-deslimer is also
provided with a deslimed product discharge opening or
3,070,228
3
pipe 22 positioned at the opposite end of the trough
from the raw feed inlet end thereof, and a slimes dis
charge launder 24 is disposed alongside the upper longi
tudinal edges 25 of the V~shaped trough. The portion
of the trough immediately adjacent the discharge pipe 22
is provided with a constriction or constricted portion 27,
and one or more other constrictions or constricted por
A
the user of my new apparatus will obtain a cleaner and
substantially completely deslimed product. The sub
stantially complete removal of slimes from the slimes
containing raw material introduced into my improved
hydro-deslimer is of particular importance when pre
paring deslimed feed for ?otation operations which are
sensitive to slime. For example, the ef?ciency of amine
containing ?otation reagents employed to ?oat siliceous
matter in the bene?ciation of phosphate rock is adversely
10 affected by the presence of slimes in the ?otation feed,
tions 28 of the trough are provided between the discharge
end and the feed input end of the hydro-deslimer.
When in use, the hydro-deslimer is ?lled with water
and as most amine ?otation reagents are quite expensive
up to the upper longitudinal edge 25 of the longitudinal
reagent costs can become excessive if appreciable amounts
trough It}. Additional water may be introduced into the
of slimes are present in this feed. However, I have found
trough along with the raw feed material at the input end
that when my new hydro-deslimer is employed to pre
of the apparatus, and an appreciable quantity of wash
water is introduced into the trough through the per 15 pare deslimed ?otation feed for an amine ?otation oper
ation the consumption, and hence the cost, of the amine
forated bottom wall 14 thereof. A portion of the water
reagents employed is reduced on an average of about one
introduced into the trough is withdrawn therefrom through
half to one-quarter of that previously required.
the deslimed product outlet 22, the balance of the added
From the foregoing description of my counter?ow
water over?owing over the upper edge 25 of the trough
into the slime discharge launder 24. As a result of the 20 hydro-deslimer it will be seen that I have made an im
portant contribution to the art to which my invention
introduction of the wash Water through the perforate
relates.
bottom wall 14, the discharge of a portion of the added
I claim:
water through the pipe 22, the over?ow of the balance
1. A counter?ow hydro-deslimer which comprises an
of the added water into the launder 24 and the effect
of the constrictions 27 and 28 on the ?ow of said water,
elongated trough having a raw feed input at one end of
counter-?owing longitudinal currents or layers of water
the trough and a deslimed product outlet opening formed
in the bottom of the other end of the trough, a perforated
bottom wall through which a multiplicity of streams of
are established in the trough 10 as indicated by the ar
rows in FIG. 2 of the drawing.
The raw feed introduced into the hydro-deslimer com
wash water can flow upwardly into the trough, means
prises a mixture of the relatively large particles of raw 30 for supplying wash water to said perforated bottom wall,
a slime discharge launder along each upper longitudinal
material to be deslimed and the very ?nely divided par
edge of the trough, the portions of said upper longitudinal
ticles or slimes to be removed therefrom. This solid
edges adjacent said slime discharge launders being slime
raw material is introduced substantially continuously into
over?ow weirs over which slime-containing water can
the raw feed input end of the apparatus either as a dry
?ow into said launders, the trough being formed with a
mixture of the slimes-containing material or as an aqueous
slurry thereof, the solid material falling to the bottom of
the trough and being directed by the sloping end wall 11
toward the discharge end of the apparatus. The larger
particles of the solid material ?ow along the bottom of
the trough 10 toward the discharge end thereof and in
so doing these particles are continuously subjected to
the washing and desliming action of the upwardly ?owing
streams of water entering the trough through the per
forate bottom wall 14 thereof. I have found it advan
tageous to line the bottom of the deslimer trough with
lead shot (for example, to a depth of about 2 inches)
to prevent plugging of the holes 13 in the inner bottom
constricted portion adjacent the discharge opening of the
hydro-deslimer, the walls of the constricted portion of
the trough being of greater height than the height of the
slime over?ow weir portions of the longitudinal edges of
the trough.
2. A counter?ow hydro-deslimer which comprises an
elongated trough having a raw feed input at one end of the
trough and a deslimed product outlet opening formed in
the bottom of the other end of the trough, a perforated
bottom wall through which a multiplicity of streams of
wash water can ?ow upwardly into the trough, means
for supplying wash water to said perforated bottom wall,
a slime discharge launder along each upper longitudinal
wall 14 and sitting of solids into the hydraulic compart
edge of the trough, the portions of said upper longitudinal
ment therebeneath especially when the apparatus is shut
down. The deslimed larger particles of the feed material 50 edges adjacent said slime discharge launders being slime
?ow to the discharge opening or pipe 22 and are con
over?ow weirs over which slime-containing water can
tinuously withdrawn from the trough through this pipe
?ow into said launders, the trough being formed with a
along with a portion of the water contained in the trough.
The slimes washed or otherwise removed from the larger
particles of feed material are carried upwardly by the up
wardly directed streams of wash water, and as these sus
pended slimes are carried to the counter?owing upper
constricted portion adjacent the discharge opening and
with at least one other constricted portion intermediate
the raw feed inlet end and the deslimed product discharge
end of the hydro-deslimer, the walls of the constricted
portions of the trough being of greater height than the
height of the slime over?ow weir portions of the longi
layers of water in the trough they are conveyed by this
tudinal edges of the trough.
counter?owing water away from the discharge end of
3. A counter?ow hydro-deslimer which comprises an
the apparatus. The suspended slimes are then removed 60
elongated truncated V-shaped trough having a raw feed
irom the trough with the water over?owing into the
input at one end of the trough and a deslimed product
slimes discharge launder 24.
outlet opening formed in the bottom of the other end of
As a result of the constrictions 27 and 28 provided
the trough, a perforated bottom wall through which a
in the trough 10 of the hydro-deslimer, the upper layers
of water in the trough are forced to ?ow away from the 65 multiplicity of streams of wash water can ?ow upwardly
into the trough, means for supplying wash Water to said
discharge end thereof whereby a positive counter?ow
perforated bottom wall, a slime discharge launder along
action is established in the trough, and the velocity of
each upper longitudinal edge of the V-shaped trough,
the counter?owing upper layers of water in the trough
the portions of said upper longitudinal edges adjacent
10 is substantially greater than that which can be ob
said slime discharge launders being slime over?ow weirs
tained in any hydro-deslimer heretofore known. As a
consequence, the slimes are carried more rapidly away
over which slime-containing water can ?ow into said
from the discharge end of the apparatus thereby minimiz
launders, the V-shaped trough being formed with a con
ing the likelihood of entrainment or mixture of slimes
stricted portion adjacent the discharge opening and with
with the deslimed product being removed from the ap~
at least one other constricted portion intermediate the
paratus through the discharge pipe 22 and insuring that 75 raw feed inlet end and the deslimed product discharge
3,070,228
6
5
end of the hydro-deslimer, the walls of the constricted
portions of the trough being of greater height than the
height of the slime over?ow weir portions of the longi
tudinal edges of the trough.
being slime over?ow weirs over which slime-containing
water can ?ow into said launders, the trough being formed
with a constricted portion adjacent the discharge opening
and with at least one other constricted portion inter
4. A counter?ow hydro-deslimer which comprises an 5 mediate the raw feed inlet end and the deslimed product
discharge end of the hydro-deslimer, the Walls of the con
elongated trough having a raw feed input at one end of
stricted portions of the trough being of greater height
the trough and a deslimed product outlet opening formed
in the bottom of the other end of the trough, a perforated
than the height of the slime over?ow weir portions of the
longitudinal edges of the trough.
bottom wall through which a multiplicity of streams of
Wash water can ?ow upwardly into the trough, a layer of 10
References Cited in the ?le of this patent
lead shot overlying said perforated bottom Wall, means
for supplying wash water to said perforated bottom wall,
UNITED STATES PATENTS
a slime discharge launder along each upper longitudinal
2,293,033
Mead ______________ .__ Aug. 18, 1942
wall, a slime discharge launder along each upper longi
2,708,517
Evans
______________ __ May 17, 1955
tudinal edge of the trough, the portions of said upper 15
longitudinal edges adjacent said slime discharge launders
2,420,180
Laughlin _____________ __ May 6, 1947
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