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Патент USA US2122400

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July 5, 1938.
Filed Jan. 14, 1936
2 Sheets-Sheet , 1
July 5, 1938.
Filed Jan. 14, 1936
2 Sheets-Sheet 2
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FIG. 3.
F'IG. 4.
_îî î-_î‘
Patented July 5, 1938
Guy C. Anderson, San Francisco, Calif.
vl‘lpplicatio'n January 14, 1936, Serial No. 59,060
5 Claims. (Cl. 209-191)
This invention- relates to improvements in
amalgamating machines and more particularly to
The vertical shaft 'I extends upward through
this neck and Vis mounted in the radial thrust
gold separators and the method of separating
bearing 8 and the step bearing 9 supported within
the pedestal. This shaft is driven by the bevel
precious values from mineral pulp.
In the natural state gold' particles are often
shaft I2, which is driven by the pulley I3 or any
_magnetic oxides andß'non-ferrous magnetizable
other suitable means.
materials'especially in black sand. Finel gold
netizable materials without removing such mate
The rotor I4 has the upstanding blind hub» I5
clearing the neck 6 and is splined on the end of
the shaft 1. The rotor clears the bottom of the
bowl and has the upper flat tractive surface I6,
provided with the depressions I'I. The nature
of this grinding or rubbing surface can be varied
to suit the particular nature of the pulp being l
rials from the aggregated mass.
acted upon.
may adhere rto such materials, or- the gold may
beencased in films containing magnetizable con
" Among the objects of the invention is to effect
mechanical separation of the gold from the mag
’ ,
» Another object is to facilitate the amalgama
tionrof free gold and gold bearing particles in the
presence of mercury.
Another object is to subject the amalgamating
area to the influence of amagnetic field.
`Anotherobject is to subject gold bearing pulp
toga rubbin’gaction in the presence of mercury
within a magnetic field;> Y
A’further'object is'to subject gold bearing pulp
in'the-‘epresence‘of mercury to Vibratoryoscilla
_ tions ’of high frequency.
Y v@ther objects and advantages will appear as the
description progresses.
In this specification and the accompanying
drawings the invention is disclosed in its preferred
form. Howeverit'is to be understood that it is
not limited 'toi this form because Vit may be em
bodied in other forms within thepurview of the
claims `following the description. p _
11n. the two sheets of drawings: 'e
ff Fig. l is a vvevßrtical section of an amalgamating
millj constructed in accordance with this inven
Fig; 2 'is `a4 plane detail of the rotor and stator
gear I0 and the gear II ñxed on the counter
fcundin close association with magnetite, iron
Fig. 3 is a side elevation, partially in vertical
section, of the magnetic amalgamating trap for
use in combination with the amalgamating mill in
the present process of magnetic-amalgamation.
Fig. 4 is a detail view in horizontal section of
one of the baffles in the amalgamating trap.
In detail the construction illustrated in the
drawings, referring first to Fig. 1, comprises the
magnetic bowl I, mounted vupon the pedestal 2
. n
suitable base.
l -
A series of mills may be
. ¢ i
riven from a com
The stator I8 is similar to the rotor in general
outline and has the surface I6’ contacting there
with, and the center dome I9 enclosing the hub
of the rotor.
The splash plate or cover 20 is bolted to the rim
3 and overhangs the stator. The manual stud
screws 2| are fixed in the stator I8 and threaded
through the hand wheels 2|’ above the cover to
regulate the mechanical pressure against the
pulp flowing between the rotor and stator.
Therpulp introduced into the dome I9 through
the hopper 22 is distributed by the rotating hub
I5 of the rotor and passes between the _rotor I4
and stator I8 before escaping through the over
fiow pipe 23 fixed through the rim 3 beneath the 30
The inductive coil 24 of an electro-magnet is
introduced between the flanges 4 and 5 and en
circles the rim of the bowl in line with the rotor
and stator. This coil is in circuit with the gen
erator 25 and the switch 26. When the switch
is closed the coil is energized and creates a mag
netic field acting upon the magnetic/.able mate
rial passing through the mill' and particularly
while being rubbed between the rotor and stator.
Where ñrst cost is a controlling factor the ap
paratus can be built of cast iron. But the iron
tends to shield or concentrate the magnetic lines
of force within the iron of the bowl. It is prefer
able therefore to» form the bowl and other parts
within the magnetic field of non-magnetic mate
rial. There are metal alloys and vitreous mate
rials suitable for the purpose, which will permit
the magnetic force to act directly upon the mag
netic oxides and the like, in the liowing pulp.
From the overflow 23 the pulp is conducted
wer end of the columnar trap 21
‘md nverñmsítlî.
coil 29 in circuit with the generator 25 and the
switch 30.
The trap 2l contains the mercury 3| in its lower
portion with the amalgam draw off pipe 32 at its
lowest point. To impede 'the flow'of pulp, keep it
turbulent and thoroughly mixed the series of
bafñe disks 32, interspaced on the rod 33, are in
serted into the trap to force the pulp into more
diiTused contact with the mercury 3i.
The same magnetic conditions are set up in the
trap as exist in the bowl l. The trap 2l is in
tended to amalgamate any gold values not taken
up inthe bowl.
The pulp being fed through the hopper 22 is
15 mixedfwith mercury in a divided >state and is
rubbed into Contact with the gold particles in
The ñeid strength and arrangement of the coils
2:1 and 29 may be widely varied in the applica
tion of the invention to the different types of
amalgamators required for various mineral con
ditions. A field of 2000 gauss will suñice for the
amalgamating bowl illustrated. A considerable
reduction of this ñeld strength will however not
aiîect the eiiicacjy1 of the amalgamation.
Having thus described this invention what is
claimed and desired to be secured by Letters E’atent is:
1. A mill in the class described including a
bowl; a pulp rubbing means in said bowl; an
amalgamating substance in said bowl in contact
with said rubbing means; an electro-magnetic
coil surrounding said bowl; and means for pass
passing between the rotor and stator Iii-i8.
ing alternating -current through said coil.
The mercury 34 accumulates in the bottom of
2. A mill in the class described including a
pulp rubbing means in said bowl; an
amalgamating substance in said bowl in contact
with said rubbing means; a single electro-mag
netic coil ‘arranged to set up a iield in said bowl;
and means for passing alternating current
the bowl I, and is kept constantly agitated by
the rotor so that the surface of the mercury 34
is kept bright and lively to select any gold values
issuing at the peripheral discharge from the ro
tor-stator lll-i8, into the bowl.
This rubbing ,
action disintegrates any tarnish or film coatings
25 enveloping the gold or other values andrrenders
through said coil.`
3. A mill- in thevclass described including
them more readily amalgamatable. While there ~ bowl; a rotor in said bowl; means for driving
is a certain grinding action takes place between said rotor; a stator in said bowl in operative re
the rotor and stator due to the gritty nature of lation to said rotor; means for adjusting sai-d
the pulp the particular function is to rub the gold stator with respect to said rotor; means for in
into the mercury and cause the mechanical sep
troducing the .pulp to be treated between vsaid "
aration of the precious values from the gran
rotor and said stator; an amalgamating sub
ular material of the pulp.
stance in said bowl in contact with said rotor and
Much of this material is magnetic oxide and stator; an electro-magnetic coil surrounding said
other magnetizable material polarized or mag
bowl; and means for passing alternating current '
through- said coil.
35 netically activated in the magnetic ñeld of the
bowl I and the trap 21. ïri this condition the ad
4. A mill in the class described including a
hesive force is broken or minimized and the amal
bowl having an upwardly projecting neck; a ro
tor located below the level of said neck and hav
ing a hub extending above said neck; a shaft ex~
tending upwardly through said neck and engag
ing said hub; means for rotating said shaft; a
stator in said bowl in operative relation to said
gamatable values are immediately released and
pass into the mercury.
The magnetic ñeld also prevents amalgama
tion of -ferrous and ferric compounds. This
makesk it possible by this process to recover pre
cious values from ores and sands which have
' heretofore been impossible because of the sick
rotor and having a hopper extending upwardly
therefrom; an amalgamating substance-in said
ening of the mercury due to the absorption of
iron compounds associated with the values.
The vibratory oscillations set up within the
bowl in contact with said rotor and said stator; 45
an electro-magnetic coil surrounding said bowl;
and means for passing alternating current'
mercurï.1 by the magnetic ñeld, especially when
alternating current is used, tends to rupture thev
through said coil.
sickened skin which forms on the mercury, keep
ing the surface bright, clean and more attractive
to the values present. Since this vibration Aex
tends throughout the whole mass of the flowing
aggregate and the mercury, it increases the num
5. A mill of the class described including a
bowl;- a‘rotor in said bowl having a flat tractive 50
surface with depressions therein; means for driv
ing said rotor; a stator in said bowl having a
Aflat surface `with depressions therein in opera
tive relation with the flat surface of , said rotor;
berof collisions »between the gold particlesy and
an said bowl incon
the mercury, thus speeding up amalgamation and
conserving mercury. These effects are present
in both the rubbing mill, Fig. l, and the magnetic
tact with said rotor and> stator; an electro-mag
netic coil surrounding said bowl; and means for
passing alternating current through said coil.
mercury trap, Fig. 3.
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