Improvements in the Manufacture of Sulphide of Sodium or of Sulphide of Potassium from their Respective Sulphates.
Year: 1892

page_text: Date of Application, 18th Nov., 1892
Complete Specification Left, 16th Aug., 1893-Accepted, 23rd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Sulphide of Sodium or of
Sulphide of Potassium from their Respective Sulphates.
We, FREDERICK HERBERT GOSSAGE, of Widnes, in the County of Lancaster,
and JOSEPH WILLIAMSON, also of Widnes, aforesaid, do hereby declare the nature
of this invention to be as follows:-
:--
The object of this invention is to manufacture sulphide of sodium or of potassium
from their respective sulphates without destroying the lining of the furnace in
which the reduction is made.
According to this invention there is added to a mixture of sulphate of soda or of
potash and carbonaceous matter a sufficient quantity of alkali waste or sulphide of
calcium, the presence of which in the furnace during the process of reduction
prevents the injurious action of the sulphide upon the lining of the furnace.
The mixture of sulphides thus formed may be drawn from the furnace into open
vessels and cooled before lixiviation without danger of oxidation. The mixture is
then lixiviated and a solution obtained of the requisite strength to yield crystals of
sulphide of sodium or of potassium.
A solution of these crystals or the liquors obtained by lixiviation as aforesaid are
suited for the obtainment of bi-carbonate of soda or of potash by treatment with
carbonic acid by any of the means at present employed.
Dated this 17th day of November 1892.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicants' Patent Agents.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Sulphide of Sodium or of
Sulphide of Potassium from their Respective Sulphates.
We, FREDERICK HERBERT GOSSAGE, of Widnes, in the County of Lancaster,
Soap Manufacturer, and JOSEPH WILLIAMSON, also of Widnes, aforesaid,
Chemist, 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 object of this invention is in the manufacture of sulphide of sodium or
sulphide of potassium from their respective sulphates, to provide an efficient and
at the same time ready and inexpensive means by which such production can be
effected without destroying the lining of the furnace in which the reduction is
made.
According to this invention there is added to a mixture of sulphate of soda or
sulphate of potash and carbonaceous matter, a sufficient quantity of alkali waste or
sulphide of calcium, the presence of which in the furnace during the process of
reduction prevents injurious action of the sulphide of sodium or sulphide of
potassium upon the lining of the furnace.
We do not limit ourselves to any precise proportion of such alkali waste or
sulphide of calcium, but generally we find that 35 to 40 parts by weight of such
alkali waste or sulphide of calcium to every 100 parts by weight of the sulphate of
soda or sulphate of potash is sufficient to effect the end desired; but this invention
is not necessarily limited to the employment of these particular proportions.
The mixture of sulphide thus formed may be drawn from the furnace into open

page_text: vessels and cooled before lixiviation without danger of oxidation. The mixture is
then lixiviated and a solution obtained of the requisite strength to yield crystals of
sulphide of sodium or sulphide of potassium.
A solution of these crystals or the liquors obtained by lixiviation as aforesaid are
suited for the obtainment of bi-carbonate of soda or bi-carbonate of potash by
treatment with carbonic acid by any of the methods or means at present employed.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The herein described improvement in the manufacture of sulphide of sodium or
sulphide of potassium consisting in the use in conjunction with sulphate of soda
or sulphate of potash, of alkali waste or sulphide of calcium for the purpose
specified.
this 15th day of Ang ist 1893.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicants' Patent Agents.