Improvements in or relating to Centrifugal Ore Separators and the like.
Year: 1892

page_text: Date of Application, 5th Apr., 1892
Complete Specification Left, 24th Dec., 1892-Accepted, 4th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Centrifugal Ore Separators and
the like.
A communication from MARTIN BERNHARD ZERENER, of Dresden-Altstadt,
Saxony, in the German Empire, Engineer.
I; ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Member of the Institution of Mechanical Engineers, do hereby declare the nature
of this invention to be as follows:-
In the usual dry ore-dressing process by centrifugal force it is in most cases
necessary, or at least: advisable to remove the dust contained in the mixture of
ore, etc., by means of a current of air or blast produced artificially.
Hitherto, therefore, a separate fan or blower has been employed for. the
production of the blast.. This had to be operated independently of the centrifugal
machine causing more or less inconvenience and complication.
The object of this invention is to devise a centrifugal ore-dressing machine
which will itself produce the wind or blast necessary for its successful operation,
the construction being such that one common shaft carries both the centrifugal
machine and the fan or blower device, both of which may if necessary be integral
with each other or joined in one body.
The success of centrifugal ore-dressing or separating very largely depends upon
the maintenance of the proper relation between the power of the blast and the
speed of motion of the centrifugal machine.
This relation must be as constant and uniform as possible if unsatisfactory
results in the separation or sorting of the ore are to be avoided. Supposing for
instance that the number of revolutions of the centrifugal machine increases; if
the pressure of the air does not augment in proportion dust will not fail to gain
access to the valuable material aud impair its quality.
The improved arrangement remedies this defect as it is adapted to maintain the
relation between the speed of the centrifugal machine and the power of the blast
invariably alike.
The blast-producer oral blower may act by means of wings or vanes-though any
other type of blower, fan, or blast-producer may-be employed without departure
from the principle of the invention.
:
The ore or material to be treated in the centrifugal apparatus is introduced
through a channel or shaft and the centrifugal apparatus consists of a hollow body,
provided with radiating partitions or bridges which divide the space within
into a number of compartments for the ore to pass through in succession.
But 'according to circumstances this hollow body may be replaced by a simple flat
dise or any other arrangement suitable for centrifugal work; for the special
arrangement of the centrifugal machine does not lie, any more than the special
arrangement of the ventilating machine, within-the-seope of this invention.
i
The centrifugal and the blast-producing devices are mounted on the same vertical
shaft. The portion forming the fan or blower immediately joins the body at the
top. Upon its external surface it is provided with ribs by means of which it
gathers or stores up the air confined'in the chamber and forces it upwards against
stationary vanes which are curved and adapted to lead off the air through a
chimney or outlet above them.
'
Valves may be arranged in the part of the chamber intermediate between the
fan" and the body: Lower down is an annular damper by means of which the
5 discharge orifice of the centrifugal machine may be reduced in, width to a certain
extent though not more than is consistent with the free passage of the material

page_text: treated. When it is desired to diminish the quantity of air to be exhausted from
the space or chamber in which the centrifugal operation takes place, one or more
of the valves are opened whereby the air is admitted in a direct way. When, on
the contrary, the amount of air should continue uniform, while the speed of the
blast at the discharge orifice of the centrifugal machine requires changing or
adjusting, the damper is closed or opened to a greater or less extent.
The shaft receives motion through the medium of a driving strap or belt.
Although it is herein mentioned that the blast is led off at the top, the same might
equally well be done through the lower part of the machine the general arrangement
being modified accordingly.
ALFRED J. BOULT.
COMPLETE SPECIFICATION.
Improvements in or relating to Centrifugal Ore Separators and
the like.
A communication from MARTIN BERNHARD ZERENER, of Dresden-Altstadt,
Saxony, in the German Empire, Engineer.
I, ALFRED JULIUS BOULT, of 323 High Holborn, in the County of Middlesex,
M.I. Mech. E., and Chartered Patent Agent, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
In the usual dry ore-dressing process by centrifugal force it is in most cases
necessary or at least advisable to remove the dust contained in the mixture of
ore, etc., by means of a current of air or blast produced artificially.
Hitherto, therefore, a separate fan or blower has been employed for the
production of the blast. This had to be operated independently of the centrifugal
machine, causing more or less inconvenience and complication.
The object of this invention is to devise a centrifugal ore-dressing machine which
will itself produce the wind or blast necessary for its successful operation, the
construction being such that one common shaft carries both the centrifugal machine
and the fan or blower device, both of which may if necessary be integral with
each other or joined in one body.
The success of centrifugal ore-dressing or separating very largely depends upon
the maintenance of the proper relation between the power of the blast and the
speed of motion of the centrifugal machine.
This relation must be as constant and uniform as possible if unsatisfactory results
in the separation or sorting of the ore are to be avoided. Supposing for instance
that the number of revolutions of the centrifugal machine increases; if the
pressure of the air does not augment in proportion, dust will not fail to gain access
to the valuable material and impair its quality.
The improved arrangement remedies this defect, as it is adapted to maintain the
relation between the speed of the centrifugual machine and the power of the blast
invariably alike.
A machine constructed in this manner is shown in the accompanying drawings
in which
Fig. 1 is a vertical section of the machine,
Fig. 2 a cross section on line x x of Fig. 1, and
Fig. 3 another cross section on line y y of Fig. 1.
The blast producer or blower as here shown by way of example may act by
means of wings or vanes though any other type of blower fan or blast producer
may be employed without departure from the principle of the invention.
The ore or material to be treated in the centrifugal apparatus A is introduced
through the hopper or shoot a. As shown in the drawings the centrifugal
apparatus consists of a hollow body provided with radiating partitions or bridges

page_text: which divide the space within into a number of compartments for the ore to pass
through in succession. But according to circumstances this hollow body may be
replaced by a simple flat disc or any other arrangement suitable for centrifugal
work, for the special arrangement of the centrifugal machine does not lie, any more
than the special arrangement of the ventilating machine, within the scope of this
invention.
b is the vertical shaft whereon the centrifugal and the blast producing devices
are mounted. The portion c forming the fan or blower immediately joins the
body A at the top. Upon its external surface it is provided with vanes d by means
of which it draws up the air and forces it upwards against stationary vanes e which
are curved and adapted to direct the air through the chimney or outlet f above
them.
Valves g may be arranged in the part of the chamber B intermediate between the
fan c and the body A. Lower down is an annular damper h by means of which
the discharge orifice of the centrifugal machine may be reduced in width to a
certain extent though not more than is consistent with the free passage of the
material treated. When it is desired to diminish the quantity of air to be
exhausted from the space or chamber C, in which the centrifugal operation takes
place one or more of the valves g may be opened whereby the air is admitted in a
direct way. When, on the contrary the amount of air should continue uniform
while the speed of the blast at the discharge-orifice i of the centrifugal machine
requires changing or adjusting the damper h is closed or opened to a greater or less
extent.
The shaft receives motion through the medium of a driving strap or belt on
the pulley k. Although in the drawings it is assumed that the blast is led off at the
top, the same might equally well be done through the lower part of the machine,
the general arrangement being modified accordingly.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is,-
1. In a centrifugal machine for dressing separating or sorting ore the combination
with the centrifugal apparatus of blast-producing or ventilating apparatus mounted
on the same shaft whereby the centrifugal machine according to its own speed of
motion itself generates a more or less powerful current of air or blast for removing
the dust from the ore substantially as described and illustrated in the accompanying
drawings.
2. In a centrifugal ore treating machine the combination with the centrifugal
apparatus and a fan mounted on the same shaft of an annular damper substantially
as described and illustrated in the accompanying drawings.
3. In a centrifugal ore treating machine the combination with the centrifugal
apparatus and a fan mounted on the same shaft and an annular damper of a casing
having fixed vanes and valves substantially as described and illustrated in the
accompanying drawings.
4. In a centrifugal ore treating machine the combination of a centrifugal
apparatus revolving fan fixed case with vanes valves and outlet an annular damper
and a central hopper or shoot substantially as described and illustrated in the
accompanying drawings.
Dated this 24th day of December 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.