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Патент USA US2065722

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Dec. 29, 1936.
5,665,722
A. C. MUNRO
CLASSIFICATION OF MINERALS
Filed June ‘15, 1954
5 Sheets-Sheet 1
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INVENTOR.
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Dec. 29, 1936.
A_ Q MUNRQ
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2,065,722
CLASS IFICATION OF MINERALS
Filed June 15, 1934
3 Sheets-Sheet 2
INVENTOR. '
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Dec. 29, 1936.»
2,065,722
A. C. MUNRO
CLASSIFICATION OF MINERALS
Filed June 15, 1954
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BY CLAW/W4;
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Patented Dec. 29, 1936
2,065,722 ,
- UNITED STATES PATENT OFFICE .
2,065,722
CLASSIFICATION OF MINERALS
Alexander 0. Munro, Britannia Beach,
British Columbia, Canada.
Application June 15, 1934, Serial No. 730,763 ‘
4 Claims.’ (Cl. 209-18)
and communicating with the compartment I
This invention relates to improvements in the
concentration of ores or other minerals and the
main object of the invention is to provide for
effective and economical concentration by com
5 bined ?otation and classifying operations.
An important object of the invention in con
nection with concentrating operations involv
ing classi?cation and grinding in closed circuit
is to reduce the amount of material to be ground
by suitable utilization of ?otation in connection
with such operations.
A further object of the invention is to pro
vide for decreasing the dilution or increasing
the thickness of the pulp in a classifying oper
ation and particularly in a combined ?otation
1
class‘i?er operation. Another object of the in
vention is to provide for increasing the capacity
of a ?otation-classi?er apparatus by. removal
of the slimes at a suitable stage in the operation.
An important feature of the present invention
through the passage 8 between the bottom of
ba?le means 6 and the floor 4. Suitable meam
such as a launder as shown at I0 in Fig. 6 may
be provided for supplying to the inlet passage I
‘I the pulp or mixture of crushed or ground ore
and water which is to be treated. Aba?ie II
is preferably provided at the other or discharge
end of the tank-compartment I to permit pulp to
10
?ow from compartment I into compartment 2.
Suitable means are provided for subjecting the
pulp‘ while in tank-compartment I to a ?otation
operation
for
?oating . mineral
concentrates
therefrom and suitable means are also provided
for mechanically advancing the heavier por 15
tions of pulp along the ?oor of compartment I
and into the intake end of compartment 2. The .
means for effecting ?otation may be of any de
'sired type. The form shown in the drawings
‘comprises an air pressure line I3 connected to
any. suitable source of compressed air or other
in connection with a ?otation classi?er, is that ‘compressed gas and pipes I4 extending down
the material to be subjected to ?otation and wardly from said air pressure line or pipe to
classi?cation is delivered ?rst to the ?otation within a short distance of the bottom of com
compartment in such manner that the pulp un
dergoing ?otation .and the settled solids are
caused to move in the same direction through
the ?otation compartment.
The accompanying drawings illustrate embodi
30 ments of my invention and referring thereto:
.Fig. l is a longitudinal vertical section of a
notation classi?er provided with my improvement;
Fig.
Fig.
Fig.
Fig.
35
2
3
4
5
is
is
is
is
a
a
a
a
section
section
section
partial
on line 2-2 in Fig.
on line 3-3 in Fig.
on line 4-4 in Fig.
section on line 5-5
1;
1;
1;
in Fig.
4;
Fig. 6 is a plan view of the apparatus shown
in Fig. 1, a grinding mill being shown in closed
40 circ'uit‘with the ?otation classi?er apparatus;
Fig. 7 is a partial longitudinal section of an
other form of the invention showing a modified
means of supplying air to the ?otation com
partment;
45
Fig. 8 is a section on line 8-8 in Fig. "l.
The form ‘of the invention shown in Figspl‘
to 6 comprises a trough or trough-shaped tank
or box provided with a ?otation compartment
I, preferably, extending substantially horizontal
ly and a classifying or discharge rake com
partment 2, preferably extending obliquely up
ward from one end of the ?otation compart
ment.
The ?otation compartment is provided
with side walls 3, with a horizontally extending
?oor 4 and is closed at one end by a vertical
end wall 5. A ba?le plate 6 is mounted nearthe
end wall 5 and is spaced from the‘ end wall 5
and ?oor 4 so as to form an inlet or feed pas
60
sage ‘I between said ba?le 6 and end .wall 5
partment I. The side walls 3 of compartment 26
l are formed with over?ow lips I5, preferably
beveled, over ‘which the froth may ?ow into
launders I6 arranged at each side of the com
partment I and'leading to any suitable means
for receiving the froth concentrates. Ba?les 30,
I1 and Il' may be provided for suitably con- -
trolling the circulation of the pulp.
The means for mechanically advancing the:
heavier portions of the pulp along the floor of
compartment I may comprise rakes each pro 35
vided with raking blades I8 mounted on rake .
bars I8 which are suspended by hangers 20 and
links 2| from supporting levers 22 and 22' and
are reciprocated by link connections 23 and 24
‘with an operating crank means 25 carried by an 40
operating shaft 26. Said shaft is also shown as
vprovided with cam means 21 operating an arm
28 on lever 22' said lever being connected by link
29 to lever 22 so that said levers operate in unl
son to lift the raking means during its rearward
traverse or stroke in the usual manner of raking
devices of this character. Lever 22 is shown as
pivotally mounted on an angle lever 30 which
may be connected by link or cable 3|‘ to a suit
able windlass or other means, not shown, for
adjusting the height or level of the raking means.
In connection with the ?otation tank or com
partment as above described, I prefer in some
cases to provide means for trapping or retaining
heavy concentrates or mineral values, for ex
ample, gold, as the materlal ,is raked over the
bottom compartment. For this purpose a series
of traps may be provided in said ?oor, each trap
being formed as a groove or trough 32 extending
transversely of or across the ?oor 4 and pro 60
.2.
2,065,322 /
vided with walls which ?are upwardly both in a
direction transverse to compartment I and longi
tudinally thereof.‘ Each of'said traps is pref
erably provided with discharge gates or valves
32 which may be operated by gravity in the usual
manner so as to open automatically upon accum
ulation of a certain weight of material or they
may be opened from time to time by hand if
desired.
v
>
-
a
Means are also provided for removing slimes
or ?nely dividedmtailings from the pulp, said
means comprising a plurality of launders 35
which are preferably arranged in the compart
ment 2 adjacent the passage il' below the baffle
15 I I, said launders being shown as extending trans
versely of said compartment to and through a
side wall of said compartment so as to deliver
the slimes to any suitable receiving means. These
launders deliver the slimes separately from the
20 concentrates delivered by the launder of the ?o
tation classi?er, the slimes being in the nature of
tailings and being generally rejected as waste.
In order to provide for adjustment of the opera
I
_
_
Z- _
>.
in formation of bubbles or froth and in ?otation
of mineral or ore concentrates which are taken
up by the froth and discharged into the launders
it which convey such froth concentrates to any
suitable receiving means. The larger or heavier
particles in the pulp tend to settle to the ?oor
of compartment I and are there subjected to a
raking operation by the raking means It so as to
be progressively advanced from the intake
passage 8 tothe discharge passage H’ andinthis
operation all portions of the pulp are successively
subjected to the operation of the ?otation means
so that the pulp which passes through the dis
charge passage Il' comprises substantially only
material which is not susceptible to ?otation 15
either by reason of its surface characteristics or
by reason of it being in insu?lciently divided con
dition. The non?oatable ?nely divided constitu
ent of the pulp constituting the slimes, is removed
at the over?ow launders 25 which are in sufficient 20
number and have su?icient over?ow lip capacity
to provide for removal of any desired proportion
of the slimes from the pulp before the heavy or
tion of these launders, each of said launders on coarser portion of 'the pulp is drawn out of the
liquid in the tank by the operation of the dis 25
each side thereof may be provided with an .over
flowv lip meansconsisting, for example, of a plu charge raking means ll. In this connection it
rality of superimposed bars or strips 36 which may be stated that the operation of the classi?er‘
are preferably beveled as. shown and are re
means 4| not only draws the‘ heavier material
movably supported on the side of the launder
in any, suitable vmanner. so that the over?ow level
at the lips of said launder may be vvaried accord
ing to requirements. By‘providing a plurality of
such slimes over?ow launders each having an
over?ow lip at each side thereof, the capacity of
.the apparatus for drawing 01! slimes may be
"multiplied to any desired extent thereby increas '
longitudinally and upwardly out of the body of
liquid, but also agitates the body of liquid so as so
to aid inkeeping the slimes in suspension and
izilgus insuring over?ow of slimes at the launders
The slimes are removed from the classi?ca
tion compartment -2 by means of the launders
ing the effective capacity of the apparatus and her that substantially the entire volume of
also increasing the thickness of the-pulp carrying .water supplied to the ?otation compartment is
removed ‘from vthe classi?cation compartment
theslimes.
In the compartment 2 is provided a discharge through said launders, it being understood that
raking means 38 which may be similar in opera
tion and construction tolthe discharge raking
-means in compartment i, said discharge-raking
means comprising rake bars ll, raking blades ll
mounted on said raking bars, hangers 42 con
35
II, theselaunders being‘ provided in such num
40
a small proportion of the supplied water will
be contained in the froth discharged from the
?otation‘ compartment. The provision of a plu
rality ofv launders 3i provides an extended
length of over?ow lip so that the height of ?uid
nected to said rake bars and supported by links
pouring over thelip may be kept as short as
possible. In the use of an extended over?ow lip
as at prwent provided by-the plurality of laun
- ingrod?toanarm?onarakemeans andsaid‘ ders II, a relatively thick pulp may be handled
shaft also carriesa cam ll, operating lever 45, as compared’ to the pulp concentration prac
and through link connection also operating lever ticably employable in rake classi?ers?of the de
44 so as to raise the raking means in its rearward scribed type which are provided with the con- _
stroke. Means indicated at 52 are also pref
ventional side launders, and thus the handling
erably provided for adjusting. the level of the capacity of the apparatus _ is materially in
raking means in compartment 2. The operation creased. It will be a
that the multiple 65
oi’v the raking means in the respective compart
launders 2' are actually a part of the classi?er
ments is such that each'rake is given a forward compartment 2, and are useful in connection
movement while in depressed position as to rake with a‘ classi?erv operating either with or inde
48 from levers l4 and ll. . An operating shaft 46
carries a crank 41 which is connected by connect
the heavier material upwardly along the ?oor
of the compartment and then at the end of‘ the
pendently of a ?otation compartment.
~Thereciprocating motion of the raking
rearward stroke is lowered to effect the raking ‘ means It causes an appreciable movement of
, position for the next forward stroke.
the liquid in the classifying compartment, but
The operation .of the apparatus shown in Figs.
1 to Bis‘ as follows:
The pulp containing suitably divided are or
due to the opening or discharge
ell’, the
force or surge of this liquid movement is dimin
ishedbyvirtueofthebodyofliquidylthin
‘other mineral together with water and a ?otation the-?otation compartment. This feature pre
agent is supplied as indicated at I! to the inlet vents the customary disturbing surge adjacent
passage 8 leading to the lower part of the ?ota- ' the ~slimes over?ow launders which is so char
tlon compartment and ?ows longitudinally
70' through said ?otation compartment to the dis
charge passage ll' leading to the compartment 2.
In passing longitudinally in the compartment l
the pulp is subiected to-‘a?otation operation by
the action of the air issuing from the pipes It,
7‘ this operation resulting in agitation of thepulp
acteristic of raking type classi?ers due to the
re?ection of this surge against the endwall of 70
the classiiiertankcorrespondingtothebsiiie H,
and accordingv to, this invention a relatively
quiet zone is provided adjacent the launders I‘
so that the over?ow level of the slimes may be
preserved substantially constant, and a more 15
3
2,065,722
uniform and efficient-classifying action obtained.
The coarser portions of the material ‘being
operated upon are subjected, after entering
compartment 2, to the raking action of the rake
ing means 38 whereby they are moved upwardly
the cost of subsequent operations of recleaning,
dewatering and re?ltering the ?otation concen
trate. By means of the multiple lip over?ow for
the slimes, the mineral values having. already
been removed in the ?otation operation, a very
e?icient classi?cation is enabled in the classi
?er compartment 2.
Moreover, as above
pointed out, the use of the multiple lip over?ow
for the slimes tailings enables the use of a much
thicker pulp in the classifying operation. As a
direct consequence of such thick pulp, the use
of bowl.classifiers on the withdrawn slimes may
in some, cases be entirely eliminated. This
form of slimes over?ow also enables the produc
tion of lower ?nal 'tailings and also enables 15
reduction of the ?oor space required for a given
' along the ?oor of said compartment and ?nally
discharged at the upper end of said ?oor to any
' suitable receiving means, for example, to a suit
able launder or other means whereby such ma
terial is conducted to the grinding mill indicated
at 54, the broken lines indicating the course of
“material from the discharge end of compart
ment 2 to the grinding mill and back from the
- grinding mill to the inlet Ill of the compart
,
15 ment 1.
In the above described apparatus the suit
ably crushed ‘ore coming from the mill and in
cluding the groundfeed and reground- material
is supplied at the end of the compartment oppo
20 site the raking-o? or classi?er compartment so
capacity.
The provision of the gold traps or heavy
material traps in the bottom of the classi?er
compartment is of special advantage where 20
thatv the ?ow of pulp proceeds. in the same direc- ~ the ‘ore or material being treated contains gold
tion as the motion of theheavier material under or other heavy material which is amenable to
separation by .such traps, inasmuch as it. en
the operation _of the rakes, while the removal
_of the slimes tailings is eifected after the pulp
25 has passed through the ‘?otation’ operation. The
ables separation of coarse free gold particles
and their recovery by intermittent cleaning of 25
the gold traps without disturbing the continuous
operation of the ?otation classi?er, and further
advantages of this method of operation are as
follows:
more it insures removal and recovery of such
No sulphide material is ground unnecessarily
free gold particles before the heavy settled ma
terial is returned to the mill, thereby avoiding 30
the loss which would result from regrinding if
such free gold particles were allowed to be
attritioned in the grinding mill. In this con
nection, the agitation or circulation due to the
operation of the ?otation’means and to the 35
?ne and the ?otation capacity for a given ?ne
30 material is thereby increased. In Patent No.
1,937,837 issued to me December 5, 1933, a ?ota
tion classi?er apparatus is disclosed in which
the ?ow of pulp through the ?otation compart
ment is counter-current to the advance of the
35 settled material under the operation of the rak
ing means.- The provision for concurrent ?ow ’ operation of the raking means in the ?otation
instead of the counter-current flow has certain compartment cooperates effectively with the gold
marked advantages as above stated. A further traps in enabling settling of the heavy gold,
particles in such traps and the displacement
advantage of the operation of the above-de
40
scribed apparatus in which the ?ow of pulp is of lighter gangue particles from such traps,
thereby
facilitating
the
separation
and
recov
concurrent (in the sense of direction) with’ the
advance of the settled coarse material, is that eryof the gold or other heavy material. The
classifying compartment is without any outlet
it avoids the loss of ?ne gangue particles con
taining sulphide values which have neither .for liquid at its lower portion and the slimes
?oated nor settled by gravity to the bottom of over?ow means 35 constitutes substantially the
the compartment in position to be acted‘upon sole means for discharge of liquid from said
by the raking means. It will be appreciated compartment, the settled material being dis
that there is considerable agitation of they pulp charged from said compartment by operation.
of the mechanically operated means which moves
in the ?otation compartment and such un?oat
the settled material upwardly out of the body 50
50 able particles as are not .su?iciently large or
heavy to overcome the agitation effects will be of liquid,‘ without removing any ‘substantial
.
kept in suspension in the pulp, and where such amount of liquid.
Any suitable means may be provided for sup
particles are carried directly to the slimes over
plying air to the ?otation compartment so as to
?ow launders as in the case of the showing in
e?ect the ?otation operation.
my U. S. Patent No. 1,937,837, they are lost with
Thus, as shown -
in Figs. 7 and‘ 8, the aerating means may'com
the slimes, while according to the present pre
ferred showing such particles are carried into
the classification compartment where they are
in position to freely .settle toward the classify
prise a pipe 66 connected to a suitable source
of compressed air and extending longitudinally
within the ?otation compartment 61, said pipe
being provided with perforations or slots 68 and
ing rakes, by which they .are gently trapped'and
raked toward the discharge leading to the. with a porous or pervious fabric or other cover
grinding mill.
_
.‘
ing 69 around said pipe so that the air issuing
from the pipe will be distributed into the body
_
‘Other important advantages of the present
invention are as follows:
,
"Reduction of tonnage tobe ground, .thus-ef-,
fecting as savingof grinding media consumption
and power; increase-in ?otation capacity which
is obtained by eliminating sliming of the min
eral particles such as occurs in existing classi
70 ?ers wherein the pulp is ground unduly ?ne
before being subjected to ?otation. Over-slim
ing of the mineral which always occurs in the
conventional practice not only retards ?ota
tion and thus greatly reduces the capacity of
the ?otation apparatus, but it increases greatly
60
1
of the.pulp in such manner as to insure col
lective circulation and ?otation. The construc 65
tion of the ?otation compartment 61 and clas
sifying compartment 69' and they respective rak
ing means ‘I0 and 'II with their operating means
maybe similar-to that above described and the
heads inlet 12 and the slimes over?ow 13 may 70
be provided as shown in Fig. 7.
I claim:
'
1. An ore concentrating apparatus compris
ing: a tank including a froth ?otation com
partment and a classifying compartment“ con 75
4
.
aooavaa
ment at the other side of said baiile and pro- '
and ‘in free communication therewith through
viding a1 communicating opening therebetween,
the bottom wall of said classifying compartment
sloping upwardly from adjacent said opening to
one end of said elongated tank; means for sup
plyingdivided solid material and liquid to the‘
other end of said elongated tank at the end of
an opening adjacent the bottom of said com
partments; means for supplying divided- solid
material and liquid‘to the other'end- of said ?o
tation compartment; over?ow means for said
?otation compartment for receiving and dis
charging ?otation concentrates therefrom; me ~
10
,
' tiguous to one end of said ?otation compartment
chanically operated _means at the bottom of
said ?otation compartment for mechanically
moving settled material through said compart
ment toward and through said opening and into
said classifying compartment; reciprocating rake
said ?otation compartment away from said bailie
means; over?ow means for said ?otation com
partment for receiving and discharging ?otation 10
concentrates therefrom; mechanically operated
means at the bottom of said ?otation compart
ment for mechanically moving settled material
means in said classifying compartment for me
toward said ba?ie means and into said classify
chanically moving settled material through said
compartment and away from said opening under
ing compartment through said opening; recipro
cating rake means in said classifying compart
conditions of agitation and for discharging said
ment for mechanically removing settled material v
settled material from said compartment; over
?ow means in said classifying compartment for
outwardly of said classifying compartment along
said upwardly sloping bottom wall and discharg
ing said settled material from said compartment;
partments and for removing liquid containing said liquid level de?ning means comprising over
20 maintaining a liquid level in both of said com
solids in suspension from said classifying com
partment, said over?ow means being disposed
at the end of said classifying compartment ad
25 jacent said ?otation compartment; and means
for conducting away settled material discharged
from said classifying compartment, wholly sepa
rate from material removed at said over?ow
means.
30
,
2. An ore concentrating apparatus compris
ing: a froth ?otation compartment; means for
supplying divided solid material to be treated
to one end of said compartment together with
liquid, said ?otation compartment being pro
35 vided with over?ow means for receiving and dis
charging ?otation concentrates therefrom and
being further provided with an opening at the
other end thereof adjacent the bottom thereof;
a classifying compartment communicating at one
end with said ?otation compartment through
‘45
?owmeans in said classifying compartment ad- '
jacent said baiiie means for removing liquid con
taining solids in suspension from said classifying
compartment; and means for conducting away 25
settled material discharged from said classify
ing compartment, wholly separate from material
removed at said over?ow means.
4. An apparatus for separating the solid con
stituents of an ore pulp containing water and 30
divided solids into a ?otation concentrate por
tion, a slimes portion, and a settled coarse por
tion, and for separately discharging said three
portions, comprising: a horizontally extending
?otation compartment; means for supplying such 35
a pulp to one end of said ?otation compartment;
said ?otation compartment being provided with
over?ow lip means for discharge of ?otation con
centrates and means for separately conducting
away concentrates so discharged, and being also 40
said opening and provided with a bottom wall ’ provided with an opening adjacent the bottom
inclined upwardly away from said opening; thereof at the end opposite said one end for
mechanically‘ operated means at the bottom of out?ow of the un?oatedsolid and liquid con
said ?otation compartment for mechanically stituents of said pulp; means for aerating the
moving settled material therethrough in a di
pulp in said ?otation compartment; mechanically 45
rection away from said one end toward and into operated means at the bottom of said compart
said classifying compartment through said open
ment for moving'settled material from said one
ing; reciprocating rake means in said classify
end toward and through said opening; a classi
ing compartment for mechanically removing
50 settled material upwardly along said inclined
a
20
bottom wall and away from said opening under
conditions of agitation and for discharging said
settled material from said'compartment; over
?ow means in said classifying compartment ad
jacent said one .end thereof for removing liquid
containing solids in suspension from said classi
fying compartment and for maintaining a liquid
level in both of said compartments; and means
for conducting away, settled material discharged
from said classifying compartment, wholly sepa
rate from material removed at‘ said over?ow
means.
*
>
3. An ore concentrating apparatus compris
ing: a horizontally elongated tank adapted to
hold a body of liquid; means de?ning a liquid‘
level within said tank; ba?ie means intermediate
the ends of said tank extending downwardly
from adjacent said liquid level and having its
lower end spaced from the bottom of said tank,
70 and defining a froth ?otation compartment at
one side of said ba?ie and a classifying compart
fying compartment disposed contiguous to said
opposite end of the ?otation compartment and 50
communicating therewith through said opening,
so as to receive said un?oated constituents; ‘said
classifying compartment being provided with
over?ow means for maintaining a liquid level
in both of said compartments and for discharg as,
ing water containing suspended slimes, and with a
means for separately conducting away water and
slimes so discharged, said over?ow lip means
constituting substantially the sole means for
out?ow of water from said classifying compart 60
ment; mechanically operated means in said clas
sifying compartment for removing settled mate
rial therefrom and discharging said settled ma
terial, substantially free from water, at a posi
tion above said liquid level; and means for con-_,
ducting settled material so discharged away from
said classifying compartment, wholly separate
from said ?otation concentrates and from water
and slimes discharged at the last-named over?ow
lip means.
,
’
.
nLEXANDER C. MUNRO.
70,
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