THE UTILIZATION OF WASTE CALCIUM CHLORIDE
Year: 1884

page_text: I CHARLES TRUSTED RICHARDSON of Monkton Lodge Jarrow on Tyne, Chemical
Manufacturer do hereby declare the nature of my invention for "THE UTILIZATION
OF WASTE CALCIUM CHLORIDE," to be as follows: -
The object of this Patent is the utilization of chloride of calcium preferably that
obtained generally as a waste product from the Weldon process for the recovery of
manganese in the manufacture of chlorine or that which is obtained as a wasto
product in the recovery of ammonia in the ammonia-soda process.
This chloride of calcium is utilized for the conversion of certain sulphates into
chlorides giving sulphate of lime and a chloride of the substance acted upon as the
result.
In the first place sulphate of ammonia is treated in solution with chloride of
calcium giving a precipitate of sulphate of lime and a solution of chloride of
ammonium which may be crystallized in the usual way.
In the second place sulphates of barium and strontium are treated by fluxing
with a chloride of calcium reduced to dryness thus giving chlorides of barium or
strontium and sulphate of lime from which the above chlorides are separated by
lixiviation.
In the third place mixtures of sulphate of potash, soda and other substances
known as Kainit and Polyhalite are treated with chloride of calcium. The
sulphates above named are converted into chlorides and the potash salts then
separated in the usual way.

page_text: ⚫ I CHARLES TRUSTED RICHARDSON of Monkton Lodge Jarrow-on-Tyne, Chemical
Manufacturer do hereby declare the nature of my invention for "THE UTILIZATION
OF WASTE CALCIUM CHLORIDE" and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement :-
This invention has for its object the utilization of chloride of calcium, preferably
that which is produced as a waste material in certain chemical manufactures,
notably in the Weldon chlorine process, in the ammonia-soda process, and in the
manufacture of carbonic acid and by the utilization of this waste material to obtain
pure precipitated sulphate of lime and chloride of ammonium.
The chloride of calcium solution is purified by first neutralizing the free acid
(if any) then by adding a solution of bleaching powder until no further precipitate
is produced. It is then settled and filtered.
Sulphate of ammonia is dissolved in water and treated. for the neutralization of
any free acid and the precipitation of any impurities it may contain in the same
way as prescribed for the treatment of the chloride of calcium solution.
The chloride of calcium and sulphate of aminonia solutions are then mixed
together in the exact proportions required and the decomposition represented by
immediately takes place.
The decomposition is best performed in a wooden vessel fitted with agitators.
The precipitated sulphate of lime is separated from the solution of chloride of
ammonium preferably by a filter press and is obtained in cakes which may be
dried to any required point for use as "pearl hardening" in paper making or for
other purposes.
The chloride of ammonium solution is run to concentrating pans evaporated to
the required density and then crystallized in the usual manner.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
The manufacture of pure precipitated sulphate of lime and of chloride of
ammonium (either or both) by the treatment of sulphate of ammonia by chloride
of calcium in the manner described.
CARPMAEL & Co.,
Agents for the Applicant.