Improvements in Separating or Classifying Ores and other Materials, and in Means or Apparatus employed therein.
Year: 1894

page_text: PROVISIONAL SPECIFICATION.
Improvements in Separating or Classifying Ores and other Materials,
and in Means or Apparatus employed therein.
I JAMES HOSKING of Roskear, Camborne, in the County of Cornwall, Mining
Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in separating or classifying ores and
other materials and in means or apparatus employed therein and is designed to
effect the operation continuously, effectually and economically.
The apparatus consists of a cistern or hutch divided into compartments into
which the ore falls or is supplied after classification.
The cistern is more or less filled with water to about the line of inlet and
outlet.
Fixed on the top of the cistern, and partly immersed in the water, is a
cylindrical sieve, of various meshes and preferably graduated.
This cylindrical sieve may be so constructed that the sieving is put on in strips,
between the threads of the worm forming the framing or support of the meshed
material. Although however this is a convenient method of constructing the
meshed cylinder I do not confine myself thereto.
Internally of the cylindrical sieve the worm carries the ore through the sieve,
from one end to the other or until it reaches a mesh through which it can pass and
fall into the corresponding compartment of the cistern below.
The ore is continuously or otherwise fed into one end of the sieve and clear
water is continuously run into the cistern at the opposite end.
The sieve is caused to revolve, and the action of the internal worm tends to
carry the ore against the clear water, until the ore reaches a mesh sufficiently large
to admit of its passing into the hutch or receiver below.
The continuous passing of clear water through the cylinder prevents the floating
of any of the finer stuff through the coarser meshes, the current preferably being
from the coarser to the finer meshes.
The compartmental divisions of the hutch would closely fit the periphery of the
cylindrical sieve, and cause the flow of clear water to take place through the
oylindrical sieve and not under it.
An arrangement is provided to pulsate the water through the meshes of the
sieve, and keep same clear of chokage and to facilitate passing of the particles of
the ore and other material through the meshes.
This effect may be attained by the aid of a jigging or shaking or striking
arrangement, such as cams or eccentrics operating the cylinder, but the pulsation
may be caused by other suitable method.
The object of this invention is to separate or classify the particles according to
sizes, and thus deal with stuff of smaller particles than has hitherto been done.
All attempts known to me as being hitherto used to "size" small wet stuff
through meshes.have failed because of the choking or "blinding" of the meshes.
The feeding of stuff into a classifying sieve I prefer to effect through a hollow
shaft driving and supporting the cylinder.
The carrying of the ore through a horizontal cylindrical sieve by a worm upon
the outside of which the meshes are fixed' against a clear stream of water gives
most satisfactory results when aided by the pulsations of the water through the

page_text: meshes when the stuff is being so carried and the particles of ore; such as pulp
from a stamp battery, classified as above, according to size, irrespective of specific
gravity can be afterwards dressed at a much reduced cost.
There are or may be jets of water on the top of the sieve to assist in keeping the
meshes clear.
After classification the ore may be withdrawn from the hutches through suitable
holes at the bottom or elsewhere.
Dated the 28th day of September 1894.
Improvements in Separating or Classifying Ores and other Materials,
and in Means or 'Apparatus employed therein.
I JAMES HOSKING of Roskear, Camborne, in the County of Cornwall, Mining
Engineer 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 :-
This invention relates to improvements in separating or classifying ores and
other materials and in means or apparatus employed therein and is designed to
effect the operatiouicontinuously, effectually and economically.
The apparatus consists of a cistern or butch divided into compartments into
which the ore falls or is supplied after classification.
The cistern is more or less filled with water to about the line of inlet and outlet.
Fixed on the top of the cistern, and partly immersed in the water, is a cylindrical
sieve of various meshes and graduated. Internally of the cylindrical sieve is a
worm which carries the ore through the sieve, from one end to the other, or until
it reaches a mesh through which it can pass and fall into the corresponding
coinpartment of the cistern below.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 shows the apparatus by a side view.
Fig. 2 shows the same by an end view with a portion broken out in order to show
One of the divisions.
Fig. 3 shows the cistern and sieve by a plan view.
The cistorn A is divided into compartments B. C, C, is the water 'line and
C' the outlet through which the water passes after having flowed through the
cylindrical sieve D. This cylindrical sieve may be constructed as shown in the
drawings, or the sieving may be put on in strips between the threads of the worm D'
forming the framing or support of the meshed material, or by any other convenient
method.
The ore is continuously or otherwise fed into one end of the sieve, at 'E, E',
clear water is continuously run into the cistern at the opposite end at F.
and
The sieve D is caused to revolve, and the action of the internal worin 'D' tends
to carry the ore against the clear water, until the ore reaches a mesh sufficiently
large to admit of its passing into the hutch or receiver below.
The continuous passing of clear water through the cylinder prevents the floating
of any of the finer stuff through the coarser meshes, the current preferably 'being
from the coarser to the finer meshes.
The compartmental divisions of the hutch would closely fit the periphery of the
cylindrical sieve, see Fig. 2, and cause the flow of clear water to take place through
the cylindrical sieve and not under it.

page_text: An arrangement is provided to pulsate the water through the meshes of the
sieve, and keep the same clear of chokage and to facilitate passing of the particles
of the ore and other material through the meshes. This effect may be attained by
The
the aid of an ordinary jigging arrangement as shown in Figs. 1 and 2.
eccentrics L, L, with rods L, L, operate the plunger M so as to give the
required pulsating motion to the water, but the pulsation may be caused by other
suitable method.
K, K, are openings in the compartments B, B, for the exit of the classified
material!
The feeding of stuff into the classifying sieve I prefer to effect through a hollow
shaft D' driving and supporting the cylinder D.
There are or may be jets of water on the top of the sieve to assist in keeping the
meshes clear.
"
The object of this invention is to separate or classify the particles according to
Bizes, and thus deal with stuff of smaller particles than has hitherto been done.
small wet stuff
All attempts known to me as being hitherto used to "size
through meshes have failed because of the choking or "blinding" of the meshes.
The carrying of the ore through a horizontal cylindrical sieve by a worm upon the
outside of which the meshes are fixed, against a clear stream of water gives most
satisfactory results when aided by the pulsations of the water through the meshes
when the stuff is being so carried and the particles of ore, such as pulp from a
stamp battery, classified as above, according to size, irrespective of specific gravity,
can be afterwards dressed at a much reduced cost.
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 1
claim is :-
1. The combination or arrangement of the parts of apparatus for separating or
classifying ores and other materials, as set forth.
2. The construction and use of apparatus for separating or classifying ores and
other materiala wherein the stuff is fed through a hollow shaft which said shaft
also serves for driving and supporting the cylinder, substantially as set forth.
3. The construction and use of apparatus for separating or classifying ores and
other materials wherein the carrying of the ores or stuff is effected through a
hollow cylindrical sieve by a worm upon the outside of which said worm the
meshes are fixed, against a clear stream of water, with or without the aid of
pulsations imparted to the water, through the meshes of the cylinder whilst the
stuff is being so carried, all substantially as and for the purpose set forth.
Dated the 24th day of June 1895.
WM. BROOKES & SON,
55 & 56 Chancery Lane, London, Agents for the Applicant.