Improvements in Dry Concentrators for the Treatment of Ores.
Year: 1895

page_text: Date of Application, 6th July, 1895
Complete Specification Left, 6th May, 1896-Accepted, 5th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Dry Concentrators for the Treatment of Ores.
CHARLES RAINEY Twyning Cottage Banstead Road Sutton Surrey Engineer
do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a simple and reliable method of
concentrating pulverized ore by a dry process and is constructed as follows:-
Through a compartment or rectangular chamber I pass a continuous stratum of
air, by making at one end a hole or slot of suitable size and on the opposite end
a corresponding hole, over which an exhaust fan works.
Above the air inlet, and a short distance from it, on the top of the machine is
erected a suitable hopper & rollers.
The rollers are to crush up any lumps that may have inadvertingly got into the
hopper. Beneath the rollers is the feeder, which is a V shaped hopper terminating
in a tube of oblong shape which by springs presses upon a roller, which thus closes
the outlet of the hopper.
When the roller is revolved a perfectly even feed is obtained.
The pulverized ore thus feed in dropping comes in contact with the stratum of
air, and is carried along with it, more or less according to the size or specific gravity
of the different particles.
Arranged along the bottom of machine are a series of compartments or draws
into which the different concentrates fall, the richer concentrates being in the draw
nearest the air inlet.
Dated this Third day of June 1895
CHARLES RAINEY,
Applicant.
Improvements in Dry Concentrators for the Treatment of Ores.
I, CHARLES RAINEY of Twyning Cottage, Banstead Road Sutton Surrey do
hereby declare the nature of my said invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement :-
The object of my invention is to effect improvements in the method of and in
means and appliances for concentrating pulverized ore by a simple and reliable dry
process.
According to my invention 1 pass a continuous current of air through a
rectangular chamber, by forming therein at one end an adjustable opening, for
the entrance of the air, and at the opposite end a corresponding opening in
connection with a rotary exhaust fan.
The pulverized ore is fed into the apparatus at the induction end of the chamber,
and at right angles or thereabouts to the incoming current of air. The air current
carries the falling material towards the exit end of the chamber, the heavier
particles falling into the nearest receptacles, and the lighter particles being carried
farther and falling into the receptacles more remote from the inlet opening
for air.

page_text: The lower part of the chamber is fitted with openings in combination with
inclined surfaces, through which openings the materials fall into boxes, drawers,
bags, or other suitable receptacles for collecting the material; most of the refuse
or waste material being carried outwards to the last opening.
The inlet passage is fitted with a sliding door for adjusting and regulating the
area of the opening, and the passage leading to the fan is fitted with a flap valve
capable of oscillating upon its axis and suitably loaded to regulate the current, the
axle being carried to an indicating dial and fitted with a pointer.
means
a
roller
The feed is effected by ns of a hopper, at the lower end of which
is fitted, which is rotated at a suitable speed by gearing attached to the driving
gear of the fan; the latter being driven by any suitable motor.
And in order that my said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawing, being a
longitudinal sectional elevation, illustrating one
one method of carrying out my
invention.
ther
a a are the external walls of the chamber. is the opening for the admission
of air, fitted with a sliding door c. d is a trough leading to the exhaust fan e.
is a flap valve attached to an axle g. This axle is extended to the indicating
disc, and carries a hand or pointer k by which, the angle assumed by the flap
valve is indicated.
m is the feed hopper fitted with a roller n, preferably having
a smooth surface, and which, although closely fitting the opening of the hopper,
conveys the material into the chamber in the form of a film.
ó o are openings for receiving the material as it falis from the traversing current
of air. pp are inclined covers, upon which some of the material falls, and whereby
it is carried to the respective openings. The lightest and most comminuted
material is carried to the space falling upon the flap valves, which is fitted
with a spring to enable it to open slightly as the material accumulates, and allow
it to fall through gradually. Boxes, drawers, bags, or other suitable receptacles
are placed at t t to receive the material, from whence it can be removed from time
to time. "All the fittings are made as nearly as possible airtight to prevent the
entrance of air by any other opening than that shown at b.
The trough leading from the fane is provided with a throttle valve, controlled
by a govenor in a similar manner to that used in connection with steam engines,
whereby the flow of air is regulated.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved dry concentrator for the treatment of ores, substantially as
herein before described and illustrated by the drawing.
2. In dry concentrators for the treatment of ores the application and use of an
induced current of air, under minus pressure, intercepting the descending pulverized
ore & carrying the same to various receptacles, substantially as herein before
described and illustrated by the drawing.
3. In dry concentrators for pulverized ore, the application and use of a feeder,
constructed and operating substantially as herein before described and illustrated
by the drawings.