An Improved Process for Obtaining Barium Carbonate from Native Sulphate of Barium.
Year: 1897

page_text: Date of Application, 16th Jan., 1897
Complete Specification Left, 15th Oct., 1897-Accepted, 20th Nov., 1897
[Communicated from abroad by the Firm of JNG. S. LEVI AND Co., of Via Pietro
Micca 15, Turin, in the Kingdom of Italy.]
An Improved Process for Obtaining Barium Carbonate from Native
Sulphate of Barium.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
This
This invention relates to an improved process by which carbonate of barium
can be obtained on a large scale for industrial purposes by the treatment of native
sulphate of barium as the primary or original substance. This process comprises
a series of operations which succeed one another in the following manner.
1st. The reduction of sulphate of barium into sulphuret of barium.
operation is effected in reverberatory furnaces, in which the powdered sulphate
of baryta is treated with a reducing body, for instance carbon, iron or manganese
slag or the like. In this operation the sulphate loses two molecules of oxygen
and changes into the sulphuret. Supposing the reducing body employed to, be
carbon, the operation would be represented by the formula:
BaSO + C₂ BaS+2 CO₂
=
1
2. The solution of the sulphuret of barium thus obtained, in hot water for the
purpose of washing and thereby obtaining it in a pure state and, as far as possible
in a crystallized form. This operation is carried out by using the ordinary methods
of washing and crystallization.
3. The solution of the pure crystals of sulphuret of barium, and the precipita-
tion of the carbonate of barium; which precipitation may also be effected from
the mother waters of the said crystals, in order to obtain a residual product.
This operation is effected by treating the solution of sulphuret of barium,
with a solution of an alkaline carbonate, preferably carbonate of potash or soda
on the basis of the formula:
BaS + NaOCO₂
===
BaOCO₂ + NaS
in which the element Na may be substituted by another alkaline body.
The decantation of the solution of sulphuret of sodium and washing of the
carbonate, which latter after being dried forms a commercial product. These
operations may be carried out according to the ordinary methods employed for
decanting and drying.
5. The concentration of the solution of sulphuret of sodium forming the decanted
residual product of the preceding operation and the crystallization of the same.
2. The solution of the sulphuret of barium thus obtained, in hot water for the
purpose of washing and thereby obtaining it in a pure state and, as far as possible
in a crystallized form. This operation is carried out by using the ordinary methods
of washing and crystallization.
3. The solution of the pure crystals of sulphuret of barium, and the precipita-
tion of the carbonate of barium; which precipitation may also be effected from
the mother waters of the said crystals, in order to obtain a residual product.
This operation is effected by treating the solution of sulphuret of barium,
with a solution of an alkaline carbonate, preferably carbonate of potash or soda
on the basis of the formula:
BaS+ NaOCO₂ = BaOCO₂ + NaS
in which the element Na may be substituted by another alkaline body.
The decantation of the solution of sulphuret of sodium and washing of the
carbonate, which latter after being dried forms a commercial product. These
operations may be carried out according to the ordinary methods employed for
decanting and drying.
5. The concentration of the solution of sulphuret of sodium forming the decanted
residual product of the preceding operation and the crystallization of the same.

page_text: The sulphuret of sodium thus crystallized becomes a secondary commercial pro-
duct which renders the production of carbonate of baryta still more remunerative.
These operations are carried out by employing the usual methods of concentra-
tion and crystallization.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is:-
1. A process for obtaining carbonate of barium from natural sulphate of barium
consisting in the reduction of the sulphate of barium into sulphide of barium by
treating it with a reducing agent, and in then precipitating from this sulphide
the carbonate of barium by means of an alkaline carbonate.
2. A process for producing carbonate of barium from natural sulphate of barium
upon a commercial scale, consisting in the successive operations particularly
described in the foregoing specification.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C.,, Agents for the Applicant.