Year: 1888

page_text: 1, JAMES WILSON, 45 Salamander Street Len, .D. Uneuner
nature of this invention to be as follows :-
This Invention relates to the Sulphide of Soda used in making Sulphide of Zinc.
When Sulphide of Soda is prepared by calcining together Sulphate of Soda
and Coal it invariably contains Carbonate of Soda and when such Sulphide is
mixed with a soluble salt of Zine it produces Carbonate of Zinc mixed with the
Sulphide of Zinc.
In the subsequent heating to which the Sulphide of Zine is subjected the Carbonate
of Zine is decomposed, whether in contact with air or not, and produces Oxide of
Zine which colours the Sulphide of Zine yellow.
My improvements consist in removing the Carbonic Acid from the Sulphide of
Soda prepared as ahove, or in employing Sulphide of Soda free, or nearly free, from
Carbonic Acid, prepared by decomposing Sulphate of Soda with Sulphide of Lime,
Barium or Strontium. The removal of Carbonic Acid from Sulphide of Soda may
be effected by means of Sulphate, Sulphide or Chloride of Lime or Magnesia, or the
Sulphide or Chloride of Barium or Strontium by treating the solution of Sulphide
of Soda with any of these reagents, or by mixing the Sulphate of Soda prior to, or
during, its calcination with Coal, with Sulphate of Lime, Baryta or Strontia.
3600
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page_text: JAMES WILSON, 43 Salamander Street, Leith, 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 :-
This Invention relates to the Sulphide of Soda used in making Sulphide of Zinc.
When Sulphide of Soda is prepared by calcining together Sulphate of Soda and
Coal it invariably contains Carbonate of Soda, and when such Sulphide is mixed
with a soluble Salt of Zinc in solution it produces Carbonate of Zinc mixed with the
Sulphide of Zine.
In the subsequent heating to which the Sulphide of Zine is subjected, the Carbonate
of Zinc is decomposed whether in contact with air or not, and produces Oxide of Zine
which colours the Sulphide of Zinc yellow and lessens its covering power as a
pigment.
My improvements consist in removing the Carbonic Acid from the Sulphide of
Soda as above prepared, or in employing Sulphide of Soda free from Carbonic
Acid prepared by decomposing Sulphate of Soda with Sulphide of Lime, Barium or
Strontium. The removal of Carbonic Acid from the Sulphide of Soda may be
effected by means of Sulphate, Sulphide or Chloride of Lime or Magnesia, or the
Sulphide or Chloride of Barium or Strontium by treating the solution of Sulphide of
Soda with any of these reagents, or by mixing the Sulphate of Soda prior to or
during its calcination with Coal, with Sulphate of Lime, Barium or Strontium.
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;
1. In the manufacture of Sulphide of Zinc; purifying from Carbonic Acid the
Sulphide of Soda used to precipitate the Sulphide of Zinc.
2. Using a solution of Sulphide of Soda made by decomposing Sulphate of Soda
by Sulphide of Barium, Lime or Strontium.
Dated this 30th day of November 1888.