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Патент USA US2026825

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Jan. 7, 1936.
Filed'Feb. ‘19, 1954
/ Z0
Patented Jan. 7,‘ '1936
‘John‘HiDequer, Los Angelea?alif.
:Application February 19, 1934, Serial No. 711,937
,1 Claim. (Cl. 209-191)
iMyrinvention relates itoimillsiadapted *for com
are to be. recovered,iwith asilvered copper v"amal
‘;minuting, principally, precious ,metal Pbearing
'gamation plate, the purpose of which ‘will be
hereafter described.
‘A removable annular ‘bottom plate '8 is'secured
to the ‘floor of tank 4 by bolts 9, said bottom
plate, preferably made- in four sections, being
ores by ‘crushing and braying :means .as a pre
‘liminary step ‘to a recovery ofstheir valuable con
stituents; also involving :a speci?c adaptation of
.:classifying amalgamating, ?oating or other well
knownreducing means-or methods.
.A principal object of my said invention is to
"provide a small, comparatively light and com
pact, easily transported, and ‘inexpensive unit
adapted for the usual'limited scale of ‘operations
of the individual miner or prospector ‘for ef
sfecting the above :mentioned processes ‘of ore
treatment; and which vmay 'be ef?cientl-y utilized
in the ‘treatment of any kind and ‘character of
ore-in ‘pursuance of :the general objects above
‘It is also an important purpose of said‘inven
tion to provide crushing and grinding :means
'which may be easily varied in accordance with
‘the renitency of ‘the material being treated Y'by
‘the'increase or decrease of =the~weights of pestle
sleds or shoes, and :also to utilize the centrifugal
force :createdjby ‘a rotary travelling movement
of said sleds not only for said grinding process
but also ‘for the classi?cation of the --ore sands-by
their speci?c gravity; ‘and where ‘free milling vgold
values are to'loe recovered‘to- utilizesuch centrif
ugal force also to throw the ground material
'39. which is suspendedin waterwithin the tank/con
taining saidl'g-rinding mechanism up and over-a
sloping amalgamation ‘zone all :as hereinafter
speci?cally described.
:Other objects, such as simplicity and economy
of construction, low initial cost, ease "andecon
omyof operation, efliciency of action, and adap~
tability to a wide range of kinds of material to
be treated, will be obvious to those of skill in
the art to which this invention appertains, upon
an examination of the detailed description to fol
In the drawing, Fig. 1 is a side elevation
partly in section of the principal parts of my
said invention;
Fig. 2 is a sectional view on line. 2—2 of Fig. 1;
Fig. 3 is a sectional view on line 3-3 of Fig. 2;
but in addition showing the rake partially broken
away in elevation.
Referring with more particularity to the draw
composed of manganese-steel or other abrasion
resisting material, isprovided to ‘form the‘bottom
of an-annular mortar l-B, ‘and at its center ‘to
provide a mercury well-H.
increase in thick 10
ness of the outer portion of said ‘bottom plates
8 is utilized to permit the sloping of its upper
surface toward the center of the circle ‘formed
by its circumference. The outer annular area
‘between the middle of the radius‘and the periph
ery of said bottom plate ~13 is provided with ‘a
series of diametric grooves l2 ‘each ‘of ‘a width
and depth relative to the'size of‘the ore vto be
ground, the remaining ‘area of said "bottom plate
15 being smooth. The Wallet lower portion -5 of 20
said tank above bottom plate 8 is lined with de
tachable hardenedsteel-plates 13, which ‘may be
similarly grooved,‘ secured to ‘the wall of ‘said ‘low
or tank-portion! by bolts I4.
I5 indicates ‘the intake pipe through ‘which 25
ore, having been ?rst crushed to suitable size,=is
carried “to ‘the annular mortar 10 by a flower
water, ‘as later more speci?cally described, for
grinding. A pulley, adapted ‘for "rotation by ‘a
source ofpower (notshown) is illustrated at l6
attachedto shaft H to the'opposite end of which
‘pinion v‘l8 is secured which meshes with beveled
gear-l9 secured to vertical shaft 20 which is re
tatably-supported in-a-suitable framework 2;! by
a collar and thrust bearing assembly '22. ‘Shaft
20 textendsldownwardly *through the 'top of the
tank portion 6 where it is further provided with a
suitable bearing 23.
On the lower end of shaft 20, inside of tank
4, a rotor element 24 is mounted, consisting of 40
an arm having near its ends series of holes 25-45,
which overhang the track for attachment of the '
pestle-sleds or shoes 26—-26 as hereinafter de
scribed, said pestle-sleds being oppositely disposed
in annular mortar I 0, by means of chains 21-21
so that as the arm is actuated by the rotation of
the shaft to which it is connected the pastle
tank consisting of a lower part 5‘ and an upper
sleds or shoes are dragged by said chains 21
around the annular channel of mortar Ill.
The sleds or shoes 26, each consisting of a 50
base 28 and walls 29—29 are formed of some
abrasion-resisting material, such as manganese
part 6 of increased diameter, connected by ?ared
portion forming an inwardly sloping annular
ledge ‘I, covered, when free milling gold values
steel, said sleds conforming to the curvature of
the interior of the annular channel-mortar. The
front bottom edges of each of said sleds 26 are 55
ing, the numerals of which designate similar
parts throughout the several views, 4 indicates a
beveled as shown at 30 for the obvious purpose
of permitting them to ride over the pieces of ore
being ground.
Due to the fact that gold is found with a variety
of associated elements having different qualities
of hardness, means are provided to vary the pres
sure of the pestle-sleds or shoes 26 (in order to
avoid excessive consumption of power in their
motivation) consisting of a plurality of remov
10 able weights 3l-—3l which may be applied to
sleds 26 when necessary, depending on the re
nitency of the ore to be ground.
Posts 32-32 are adapted to secure the weights
within the sleds or shoes 26 as illustrated in Fig.
15 3. The speed at which the rotor arm is operated,
increasing or decreasing the centrifugal force of
the sleds, also obviously affects the pressure of
the grinding surfaces.
Drag rakes 33—33, are attached in any suitable
20 manner to each of sleds 25, being designed to stir
and loosen the ground material.
34 indicates a series of discharge openings
through which the fluid is decanted.
The operation of the device is asv follows: Ore,
previously crushed to a suitable size, is flushed
into the mill by approximately four times its
' volume of water.
Actuating mechanism to drag
the sleds around in the mortar channel then
being set in operation the sleds are caused to
slide over the ore crushing and grinding it against
the ribbed floor thereof, and by reason of the
tor to decant at levels where the ?neness of the
grind will meet the requirements of either ?ota
tion or cyanidation.
While I do not limit myself to any particular
dimensions, the following may be illustrative of
a practical embodiment of my invention showing
the extreme compactness which is an important
object thereof.
The mill itself may consist essentially of a
tank made of size %-inch boiler plate of a di
ameter varying from 21/2 to 8 feet and of a depth
of from 30 to 40 inches, depending upon the
grinding capacity desired. The bottom of the
boiler plate tank is welded in a distance of ap
proximately four inches and supported by heavy 15
angle irons welded across the bottom. The bot—
tom manganese plates of the annular mortar
l8 may be 1%; inches thick at the outer edge and
slope to l inch at the center of the mill. These
bottom plates may be grooved to a depth of 1/2 20
inch and a width of 1%; inch, such grooves being
1/2 inch apart and running from the periphery to
the center, about one-half the width of the plate.
The lower portion 5 of the tank may be lined
to a height of 8 inches by the manganese side 25
plates l3, which plates being detachable may be
replaced from time to time as they become worn
out, as is also true of the bottom liners 8. The
flare of the lower tank at its connection with the
upper tank by the zone '7 may be from 10 to 16 30
inches depending upon the capacity desired, its
outward swing on the supporting drains, grind
ing particles of the ore between the outer walls
slope being at a rate from 1 to 4, and being cov
of said sled and the side plates l3. As the ore is
ground to a suitable ?neness it is thrown into
where free milling gold values are to be recovered.
Comparatively little power is needed to oper 35
ate a device of the general capacity above indi
cated. A 1500-12,. P. M. motor of one horsepower
suspension and decanted through one of the
variable discharge ports or openings 34.
Free gold values by reason of the slope of the
bottom plate 8 of the annular mortar Ill gradually
40 settles or is worked toward the mercury well H
in the center of tank 5 within the annular mor
tar channel, where released gold forms an
amalgam. The ribbed upper surface of bottom
plate 8 assists in the grinding of coarse pieces
£15 of ore, the tendency being for the ?nely ground
particles of the gangue to be thrown into suspen
sion while the “free gold” tends to gravitate to-I
ward the center. The rotary movement of the
sled is communicated to the liquid contents of
.60 the tank, and the centrifugal force resulting from
said rotation throws the ground material in sus
pension up over the amalgamation zone 1 where
the ?ne or floured gold values become attached
or amalgamated with the mercury of the amalga
mation plate, which may be used to cover zone 1.
The variable discharge ports enable the opera
ered by silver-ed copper amalgamation plates only
per ton will be sufficient to actuate a 10 to 1 re
ducing worm gear, which in turn drives the pulley
on the pinion shaft, the worm gear pulley is one
half ‘the size of the pinion pulley causing fur
ther reduction, which brings about a relatively
slow rotarymotion of the sled.
What I claim and desire to secure by Letters
Patent, is:—
In a device for milling and separating ore, a
tank, an annular mortar with perpendicular cy
lindrical sides and an inwardly sloping bottom
forming a channel extending around the bottom
of said tank, radial grooves in the upper surface
of the bottom of said mortar, pestle-sleds, means
to increase the weight of said sleds, drag rakes
attached to said sleds, and means to impel said
sleds around said channel and over pieces of ore
fed to said mortar.
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