Improvements in Apparatus for Separating, Classifying, and Purifying Minerals and other Materials.
Year: 1895

page_text: Date of Application, 26th Feb., 1895-Accepted, 29th June, 1895
COMPLETE SPECIFICATION.
Improvements in Apparatus for Separating, Classifying, and Purifying
Minerals and other Materials.
We, AUGUSTE FRÉDÉRIC BEYER, and ADOLPHE GUSTAVE BEYER, both of
41 Rue Taitbout Paris in the Republic of France, 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 :-
The apparatus with its various adjuncts is especially suitable for the treatment
of phosphates.
The improvements which form the object of the present application have
reference to a machine of our invention for which we have obtained a Patent
No. 3678 of the year 1894.
These improvements relate principally to the classifying chambers which in
place of being superposed are placed side by side which allows of the employment.
of a single central conduit distributing the charged air equally to each classifying
chamber, they relate also to the method of mounting and stretching the silks, the
inclined position of the moveable hoods and the arrangement of the lateral
blowers.
Our improvements are shewn in the annexed drawings in which :-
Figure 1 is a longitudinal sectional elevation of two twin classifying chambers.
Figure 2 is an axial vertical section of one of the classifying chambers showing
the interior of the moveable hood.
Figure 3 is a detail section to a larger scale of the moveable hood showing a
circle composed of two irons rivetted on a flat strip or of drawn iron.
Figure shows the profile of the drawn iron on which the silks are hung.
Figure 5 shows the method of supporting the brackets for the tension wires of
the silks.
In Figures 1 and 2 the central conduit A leads from the pulveriser to the
classifying chambers which are continuous in their action and adapted for
enriching minerals in general and in particular natural phosphates of lime.
Our apparatus allows of the greater part of the products of pulverisation to be
operated on simultaneously and the classification according to density of the
constituent elements of the materials submitted to treatment.
In our apparatus we effect the classification by continuous agitation of the
material in the presence of air or other gas introduced at the same time with it
into the apparatus.
The apparatus is constructed in such manner as to produce eddies in the material
during its passage in the conduit A until it reaches the classifying chambers which
we will now specially describe the detailed construction of the other parts of the
apparatus having been described in the Specification of the said Patent.
The section of the ceutral conduit A which at the exit from the pulveriser may
be either round or square gradually becomes deformed to a rectangular opening
whose length is the width of the twin classifying chambers and whose width is that
necessary to equalise with a slight augmentation the section of this conduit A to
its commencement at the pulveriser. This conduit terminates in a fork Gas shown
for dividing the product equally one half going to each classifying chamber.
At the junction of the central conduit A with the fork G is placed a flap H
mounted on pivots and having an external regulating lever I for adjusting if
necessary the uniformity of the distribution to each of the classifying chambers

page_text: which are connected above by a sheet iron saddle plate J to prevent the accumu-
lation of material on the outside of the apparatus and which at the bottom rests on
a sort of trestle K supported on the plate L as shown in these two figures.
Each of these coupled classifying chambers has a portion of its circumference
movable and furnished with silk (called the hood B):-the characteristic point of
this new construction is that the silk E with which the hoods are furnished starts
from the highest point and descends to where the materials commence to flow onto
the inclined plane M forming a prolongation of the shoot N.
At the centre of these classifying chambers in the neutral line of the eddy are
placed at each side holes O to lead the blast from the inside onto the top, one
being at the beginning of the silk and the other at the rear of the part covered
with silk, for constantly freeing the top from accumulations of the eliminated
materials which form there.
The conduits of the shoot N are by preference connected to the classifying
chambers by knee-pieces P which allow the inclination to be varied in all
directions.
These classifying chambers are lined inside with smooth sheet iron Q as shown
in Figure 2 with a binding R at the edges.
The silk with which the movable hoods B are furnished is formed in four bands
or breadths E as shown in Figures 2 and 3.
These breadths E are held by means of wires stretched by the screws S on the
outside of the hood B and lying in the grooves in the irons C forming the
intermediate circles.
These grooves C receive a band of square indiarubber; the edge of the breadth
of silk is placed between two bands of cloth so that one or other of the breadths
of silk E can be replaced at pleasure. So held the silk droops less and is much
more rigid.
The moveable hood B is also furnished at the middle (Figure 1) with a cross
bar T with screws permitting of stretching sideways the whole system after
mounting the breadths E by slightly moving apart the ends of the hood B.
The moveable hoods B are connected to their base by a wooden frame U
serving to fix them on the classifying chambers and serving also to keep the
supports of the tighteners F clear leaving uncovered the junction of the silk with
the sheet iron on which it is simply stuck; this clearance prevents the accumulation
of dust.
Having now particularly described and ascertained the nature of our said iuven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The arrangement of twin classifying chambers back to back and not super-
imposed affording a double surface for the elimination of one of the elements, the
lightest, entering into the composition of a mineral or other body.
2. The combination of a single central conduit distributing equally the charged
air into each classifying chamber with a regulating flap or vane and a conduit
arranged as described above with equal but deformed sections and terminating in a
fork.
3. The method of employing the silk in breadths and the way of stretching
them.
4. The inclined arrangement of the moveable hoods.
5. The arrangement of the lateral blasts.
All substantially as described and shown in the drawings.
CARPMAEL & Co.,
Agents for the Applicants.