IMPROVE- MENTS IN THE MANUFACTURE OF SALTS OF STRONTIA AND OXIDE OF STRONTIUM
Year: 1883

page_text: LETTERS PATENT to William Augustus Rowell of 1 Jesmond Gardens
Newcastle on Tyne Chemical Manager for an Invention of IMPROVE-
MENTS IN THE MANUFACTURE OF SALTS OF STRONTIA AND OXIDE OF
STRONTIUM."
PROVISIONAL SPECIFICATION left by the said William Augustus Rowell
at the Office of the Commissioners of Patents on the 18th January 1883.
WILLIAM AUGUSTUS ROWELL of 1 Jesmond Gardens Newcastle on Tyne
Ohemical Manager. "IMPROVEMENTS IN THE MANUFACTURE OF SALTS OF
STRONTIA AND OXIDE OF STRONTIUM."
This invention has for its object improvements in the manufacture of salts of
strontia and oxide of strontium,
1st. Sulphate of strontia or celestine is ground and pulverized as fine as possible
and boiled in a strong solution containing carbonate of soda by which a large
proportion of the sulphate of strontia is converted into carbonate of strontia and
a similar proportion of carbonate of soda is converted into sulphate of soda As
soon as the chemical action has nearly ceased the solution of sulphate of soda and
carbonate of soda is drawn off.
The residual mixture of carbonate of strontia and sulphate of strontia is then
boiled consecutively in other strong solutions containing carbonate of soda by
which the whole of the sulphate of strontia is converted into carbonate of strontia.
The solutions of carbonate of soda and sulphate of soda resulting from the above
operations are used to operate upon a fresh portion of pulverized sulphate of
strontin and by means of a continuous series of vessels by the method well known
to chemists and consecutive presentation of the mixed sulphate and carbonate of
strontia to the mixed solutions of carbonate and sulphate of soda, the whole of
the carbonate of soda is converted into sulphate of soda and the whole of the
sulphate of strontia into carbonate of strontia. The proportions of sulphate of
strontia and carbonate of soda to be used or their chemical equivalents—with a
light excess of carbonate of soda so as to ensure complete decomposition. The

page_text: decomposition may be effected in one boiling but requires a long time and larger
excess of carbonate of soda.
2nd. The solution used for the above purpose is either a solution of carbonate of
soda or what is known in the soda trade as "tank liquor" which may be carbonated
before use by ejecting carbonic acid gas in any forin.
3rd. The carbonate of strontia and sulphate of soda resulting from the above
operations are then treated in the manner described in the provisional Specification
of an Application for Patent bearing oven date herewith.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Augustus Rowell in the Great Soal Patent Office on the
17th July 1883.
WILLIAM AUGUSTUS ROWELL of 1 Jesmond Gardens Newcastle-on-Tyne
Chemical Manager.
"IMPROVEMENTS IN THE MANUFACTURE OF SALTS OF
STRONTIA AND OXIDE OF STRONTIUM
-
"
This invention has for its object improvements in the manufacture of salts of
strontia and oxide of strontium.
Sulphate of strontia or celestine is ground and pulverised as fine as possible and
boiled in a strong solution containing carbonate of soda by which a large proportion
of the sulphate of strontia is converted into carbonate of strontia and a similar
proportion of carbonate of soda is converted into sulphate of soda. As soon as the
chemical action has nearly ceased the solution of sulphate of soda and carbonate of
Boda is drawn off.
-
The residual mixture of carbonate of strontia and sulphate of strontia is then
boiled consecutively in other strong solutions containing carbonate of soda by
which the whole of the sulphate of strontia is converted into carbonate of strontia.
The solutions of carbonate of soda and sulphate of soda resulting from the above
operations are used to operate upon a fresh portion of pulverised sulphate of
strontin and by means of a continuous series of vessels (four is a convenient
number) by the method well known to chemists and consecutive presentation of the
mixed sulphate and carbonate of strontia to the mixed solutions of carbonate and
sulphate of soda, the whole of the carbonate of soda is converted into sulphate of
soda and the whole of the sulphate of strontia into carbonate of strontia The
proportions of sulphate of strontia and carbonate of soda to be used are their
chemical equivalents with a slight excess of carbonate of soda so as to ensure
complete decomposition. The decomposition may be effected in one boiling but
requires a long time and larger excess of carbonate of soda.
The solution used for the above purpose is either a solution of carbonate of soda
or what is known in the soda trade as "tank liquor" which may be carbonated
before use by injecting carbonic acid gas in any form.

page_text: The carbonate of strontia resulting from the above operations may be used for
the manufacture of other salts of strontia and sulphate of soda may be reconverted
into carbonate.
I am aware of the Patent granted to David Urquhart N° 232 in the present
year and I do not claim generally the conversion of sulphate of strontia into
carbonate of strontia by boiling the said sulphate with carbonate of soda, but what
I claim is subjecting sulphate of strontin to repeated boilings with carbonate of
soda using successively solutions more and less spent by previous boilings and
attacking with the fresh solution the nearly exhausted mineral, thereby obtaining
the almost complete conversion both of the sulphate of strontin and the carbonate
of Soda the one into carbonate of strontia and the other into sulphate of soda
substantially as described.
In witness whereof I the said William Augustus Rowell have hereunto set
my hand and seal this thirteenth day of July in the year of our Lord One
thousand eight hundred and eighty three.