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Патент USA US2115726

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.May 3, 1938.
M. w. KRoLL
2,1 15,726
Filed Dec. 16,_ 1935
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May 3, 1938»
M. w. KRoLL '
2,'1 15,726
Filed Dec. 16, 1935
2 Sheets-_Sheet 2
Patented May 3, 1938
Martin W. Kroll, Columbus, Mont., assignor of
one-half to M. Lloyd Parcells, Columbus,
Application December 16, 1935, Serial No. 54,756
2 Claims. (C1. 209-67)
The invention relates to an amalgamator and
concentrator and more especially to a combined
amalgamator, grinder and concentrator for ex
traction of precious metals.
The primary object of the invention is the
provision of a machine of this character, where
in through the use of a half circular trough sus
pended for agitation andhaving riñies therein
and freely movable grinding rollers a maximum
10 recovery of precious metal can be had from the
material being treated therein. through amalga
mation and concentration, the trough being of a
kind to avoid the material being treated from
becoming lodged or packed therein, more espe
l5 cially if the material be in a iinely divided state.
Another object of the invention is the pro
vision of a machine of this character, wherein the
sluice trough is supported in a novel manner and
the same subjected to agitation in a unique fash
20 ion, the machine in its entirety being of novel
A further object of the invention is the pro
vision of a machine of this character, wherein
the trough carries in the bottom thereof a solu
tic-n of mercury and copper plates, these serving
to effect the amalgamation of the material
treated for the recovery of precious values of ore
from, such material and avoids the carrying
away of these values with the tailings and in the
30 operation of the machine 'a minimum agitation
or a low rate thereof is required for maximum
recovery of the precious metals.
A further vobject of the invention is the pro
vision of a machine of this character, wherein the
35 copper plates as exposed within the trough are
protected from wear resultant from the motion
of the grinding rollers during agitation of the
trough in which the material is undergoing treat
ment for the extraction of precious values of
4 metals therefrom.
A still further object of the invention is the
provision of a machine of this character, which
is comparatively simple in its construction, thor
ougly reliable and effective in its operation, auto
45 matic in action, enabling the recovery of pre
cious values of metal with economy and inex
pensive to manufacture and install.
With these and other objects in view, the in
vention consists in the features of construction,
50 combination and arrangement of parts as will
be hereinafter more fully described, illustrated in
the accompanying drawings, which disclose the
preferred embodiment of the invention and
pointed out in the claims hereunto appended.
In the accompanying drawings:
Figure 1 is a vertical longitudinal sectional
view through a machine constructed in accord
ance with the invention.
Figure 2 is an enlarged sectional view on the
line 2-2 of Figure 1 looking in the direction of 5
the arrows.
Figure 3 is a sectional view on the line 3-3 of
Figure 1.
Figure 4 is a fragmentary top plan view.
Figure 5 is a perspective view of one of the 10
grinding rollers as employed within the ma
Figure 6 is a fragmentary vertical sectional
view showing a modiñed form of tailings dis
` >
Similar reference characters indicate corre
sponding parts throughout the several views in
the drawings.
Referring to the drawings in detail, the ma
chine constituting the present invention com- 20
prises a base A including longitudinal side sills
III and transverse end sills II, respectively, these
being united in any suitable manner and sup
port spaced parallel channeled beams I2 which
follow the length of the side sills I0 of the base A.
B'olted or otherwise secured to these beams I8
at substantially uniform distances from each
other are spring legs I3, the fastening of the
lower ends of these in this instance being by
bolts I4 to the said beams. The upper ends of
the legs I3 are formed with eyes I5 accommodat
ing pivots I6 journaled in spaced cross rails I1
carried at the open top of a half circular trough
I8. The rails I'I disposed crosswise of this trough
I8 are made fast thereto by bolts I9 so that in
this manner through the use of the rails and
the legs the said trough I8 can be agitated.
The rails I‘I at one side of the trough I8 have
fixed to their under sides suitable bearings 28
for accommodating a rotatable shaft 2| it vhav-
ing ñxed thereto overbalanced fly wheels 22, each
carrying the overbalancing weights 23. The
shaft 2I also carries a drive pulley 24 for a drive
belt 25 operated from any suitable source of
power. Thus the overbalancing fly wheels 22 45
will exert agitation when rotating and in this
manner the said trough I8 is agitated.
Located within this trough are transversely
disposed partitions or riiiles 26, these being spaced
the required distances from each other to pro- 50
vide a series of pockets throughout the length of
the trough. The trough I8 is supported by the
legs I3 to be inclined longitudinally thereof in
one direction. Certain of the pockets, that is to
say those for a distance of the higher end por- 55
tion of the said trough, have fitted in the bot
tom copper plates 21 having superimposed there
on wearing steel tracks 28 on which travel free
grinding rollers 29 so that the latter will not con
tact with the copper plates 21 and thus wear
therefrom upon these plates is eliminated. The
remaining pockets of the series at the lower end
portion of the track I8, which are construed as
the concentrator pockets 30 while the other pock
ets are the amalgamator pockets, have tailings
discharge openings 3| communicating therewith,
these being formed in the bottom of the trough
i8 and extend through the plates 27 and a trough
28 adjacent. The pockets 30 also carry the
rollers 29.
Suitably supported above the high end of the
through I8 is a screening hopper 32 with which
communicates a put-in chute, a portion thereof
being indicated at 33, the hopper 32 being also pro
so vided with an overiiow discharge» chute 39.
hopper 32 screens the material to be treated in
the trough ¿8 and delivers such material screened
thereinto at the high end of said trough. '
It is preferable to put a solution of mercury
‘ ' (not shown) within the group of amalgamating
pockets to function as a cleaner so that the pre
cious values of metal will be more readily at
tracted by the copper plates 2T ñtted within this
group of pockets and thereby assuring maxi
,jmum amalgamation in the treatment of the ma
terial as fed to the trough.
In the use of the machine in treating gold o-re
the bulk or weight of the ore it follows that the
concentration ratio would have to be ten to one
and the size of the openings 3| would have to be
of proper size to allow 10% of the material to
pass through them at a given rate of in-put feed
to the trough. In event that the lighter portion
0f the material under treatment carries the values
to be saved the material coming out of the open~
ings 3| would, of course, be the rejected material
or tailings, while that material finding its way
over the top of the riñies 26 would be the concen
trate to be saved.
In Figure 6 of the drawings the trough 35 has
fitted therein an apertured plug 36 which is re
movably secured so that plugs having varying
sized apertures can be applied to the trough for
proper concentrating action of the machine.
The particular shape of the trough eliminates
any possibility of the packing or lodging of the
material under treatment therein as would be
the case should the said trough present corners
or projections therein and this is particularly
true where the precious metal is of a ñnely di
vided state. Therefore, the particular trough I8
enables a maximum recovery' of precious metal
with a minimum agitation of such trough and
in this way there is prevented the carrying of the
gold over the riñles 26 and out into- the tailings
through the openings 3|.
What is claimed is:
1. An apparatus of the character described
in which this value occurs in both a free or un
comprising a substantially half circular trough,
spaced riñles within and transversely of said
trough forming a plurality of relatively wide
combined state and in a combined state the
group of pockets at the high end portion of the
trough i8 will function as amalgamators with
the pools of mercury in each while those at the
pockets therein, spaced tracks fitted transversely
within the pockets following the half circular
formation of the trough and elevated above the
bottoms of said pockets, rollers free in said pock
ets, guided by the riñ‘les and movable upon the
lower end portion of the trough are operated with
out mercury and the openings 3| discharge the
40 tailings so that the heavier minerals in the ore
Hbeing treated will escape while the lighter por
tions would, of course, be forced over the top of
tracks to be spaced from the bottoms of said 40
pockets, and amalgamating plates between the
bottom ofthe trough and said tracks tcrbe free
the rifîies 26 by the action of the water and the
rollers'29 functioning for separating the lighter
from contact with the rollers.
2. An apparatus of the character described
comprising a movable supported substantially
half circular trough, spaced rili‘les within and
, `portions of material from the heavier by virtue
of stratiñcation of the mass in the order of the
speciñc gravities of the different materials com
prising the ore under treatment. These pockets
transversely of said trough forming a plurality
of relatively wide pockets therein, spaced tracks
fitted transversely within the pockets following
the half circular formation of the trough and 50
elevated above the bottoms of said pockets, roll
having the openings function as concentrator
Vcompartments and the ratio of concentrate saved
from the material treated is, of course, governed
by the size of the opening 3|. Under operation
of the machine and supposing that a typical gold
ore contains 10% iron pyrite and 60% of the gold
ers free in said pockets, guided by the rili‘les and
movable upon the tracks to be spaced from the
bottoms of said pockets, and a copper lining With
in each pocket and disposed beneath said tracks
to lie between the same and the bottoms of said
is free and susceptible to amalgamation, the free
gold would, of course, be recovered in the amal
gamating pockets of the trough |8. The balance
of the Vgold or 40% would in all probability be
combined with the iron pyrite and would neces60 sarily have to be separated by concentration and
inasmuch as the iron pyrite comprises 10% of
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