Improvements in Apparatus for Pulverising and Purifying Salt and other Substances.
Year: 1897

page_text: Date of Application, 12th Oct.,
1897
Complete Specification Left, 4th Aug., 1898-Accepted, 1st Oct.,
1898
Improvements in Apparatus for Pulverising and Purifying Salt and
other Substances.
I, ALISTER MACNAB, of No. 23, Great Winchester Street, London, E.C., Merchant,
do hereby declare the nature of this invention to be as follows:-
My invention relates to apparatus for pulverising and purifying more especially
bay or common salt, but it is also applicable for similarly treating other soluble
salts.
Within a vertical vessel of cylindrical form having its upper part of less
diameter than its lower part is centrally mounted a revolving shaft which has
fixed on its upper part a disc and in its lower part below the disc a number of
inclined blades. The margin of the disc which is slightly inclined revolves at a
little distance below the shoulder presented where the vessel widens out, the space
between this shoulder and the margin of the disc being narrowest at the edge of
the disc. I prefer to construct the disc with one or more protuberances or serra-
tions towards the inner part so as to more effectually crush refractory crystals.
Salt with concentrated brine being fed into the upper part of the vessel, in some
cases, it may be, subjected to pressure passes through the narrow space between
the shoulder and the disc, the salt becoming finely pulverised, and then being
thoroughly mixed with the brine by the agitators below, so that all the impurities
are loosened from the salt and carried by the brine.
The salt can afterwards be separated from the brine by subsidence or by
causing the mixture of brine and salt to descend a column in which revolve
agitators inclined so as to check the down flow, the salt in virtue of its greater
gravity separating from the brine which ascends carrying the impurities with it
while the salt descends to the lower part of the column.
When salts other than bay or common salt are dealt with the liquid employed
instead of brine is a concentrated solution of the salt treated.
Dated this 12th day of October 1897.
ABEL & IMRAY,
Agents for the Applicant.
Improvements in Apparatus for Pulverising and Purifying Salt and
other Substances.
I, ALISTER MACNAB, of No. 23, Great Winchester Street, London, E.C., Merchant,
do hereby declare the nature of this invention and in what manner the same is
CD
037

page_text: to be performed, to be particularly described and ascertained in and by the follow-
ing statement:-
My invention relates to apparatus for pulverising and purifying more especially
bay or common salt but it is also applicable for similarly treating other soluble
salts as I shall describe as applied to salt, referring to the accompanying draw-
ings. Fig. is a vertical section and Fig. 2 is a plan of grinding and washing
apparatus according to my invention Fig. 3 is a vertical section of the apparatus
for separating the salt from the brine. Within a vertical vessel A. of cylindrical
form having its upper part of less diameter than its lower part is centrally mounted
a revolving shaft which has fixed on it a disc B. The margin of the disc B
which is slightly inclined revolves at a little distance below the shoulder a
presented where the vessel A widens out the space between the shoulder and the
margin of the disc being narrowest, at the edge of the dise. I prefer to construct
the disc with one or more protuberances or serrations towards the inner part so
as to more effectually crush refractory crystals. Salt with concentrated brine
being fed into the vessel A in some cases it may be subjected to pressure passes
through the narrow space between the shoulder and the disc 13 the salt becoming
finely pulverised. The mixture of pulverised salt and brine passes a vulve
into another vessel D in which revolves a shuft carrying a number of inclined
blades E. By means of partitions F the mixture of salt and brine is caused by
diaphragms to flow in a zig zag course in the outlet G the salt being thus thoroughly
washed so that all the impurities are loosened from the salt and carried by the
brine.
The washing vessel D might be arranged immediately under A the vertical
shaft carrying the dise B and the blades E being common to both. Practically
however it is preferable to employ two washing vessels as shown, their shafts
being connected by suitable gear to the shaft of A as shewn.
The salt can afterwards be separated from the brine by subsidence or prefer-
ably by causing the mixture of brine and salt to descend a column H Fig.
in which revolve blades I inclined so as to check the down flow the salt in virtue
of its greater gravity separating from the brine which ascends carrying the im-
purities with it and overflowing passes away by a channel provided with valve J
while the salt descends to the lower part of the column and issues at the bottom.
When salts other than bay or common salt are dealt with the liquid employed
instead of brine is a concentrated solution of the salt treated.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. Apparatus for pulverising salt consisting of a revolving disc having its
margin acting in conjunction with a shoulder of the vessel in which it revolves
so as to pulverise the salt substantially as described.
2. Apparatus for washing the pulverised salt comprising blades revolving in a
vessel provided with diaphragms so arranged as to cause the mixture of salt and
brine to flow through it in a zigzag course substantially as described.
3. Apparatus for separating the salt from the brine consisting in a vertical
column in which revolve inclined blades which urge the liquid upwards to an
overflow while the salt descends by gravity substantially as described.
Dated this 4th day of August 1898.
ABEL & IMRAY,
Agents for the Applicant.