SU45282A1 - The method of obtaining barium chloride and sulfur - Google Patents

Description

The lack of elemental sulfur, on the one hand, and irrational use, in the production of barium chloride, contained in barite about 14% of sulfur, on the other hand, prompted technical thought to look for new technological methods for producing barium chloride, in which sulfur from barite could be obtained in elementary form.

French Patent No. 603141 of 1925 proposes bringing sulfur dioxide gas and hydrochloric acid into contact with a solution of barium sulfur dioxide in order to obtain barium chloride and sulfur waste.

Bezugly and Belov (ed. Mon. K; 44538) modify the above method in such a way that the hydrochloric acid or barium sulphide is pre-saturated with sulfur dioxide and then the solutions are mixed, resulting in sulfur with less ash content.

The main disadvantages of these methods are:

1. The need to install furnaces for the production of sulfur dioxide from pyrites and purification of contaminants from the FZ and others.

2. Preparation of low concentrations of barium chloride solutions in view of the fact that 4JP barium sulphide is poorly soluble in

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water, thanks to which a large amount of water is introduced with the latter.

3. The complexity of the technological scheme of production due to the fact that the process of obtaining a product is divided into many stages: solution. The preparation of concentrated barium sulphide solutions is necessitated by the need to reduce steam consumption for the recovery of barium chloride solutions; b) saturation of hydrochloric acid or barium sulphide with a certain amount of sour gas; c) mixing a solution saturated with sulfur dioxide with acid or barium sulfur to release elemental sulfur and produce barium chloride; g) uparka large amounts of weak solutions of barium chloride.

According to an earlier proposal by the author, excess water is reduced by leaching sulfur barium not with water, but with barium chloride solution, and this results in a saturated barium chloride solution, which requires significantly less steam consumption for evaporation.

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However, after this, the method remains very cumbersome and complicated.

The new method that constitutes the subject of this copyright certificate is as follows:

1. A solution of barium sulphide is prepared9, and it makes absolutely no difference what concentration. It is enough to make the treatment of water with water even in the cold with obtaining about 10% solution.

2. Sulfur dioxide is passed into the resulting BaS solution to completely convert the sulfide to barium thiosulfate. At the same time, almost all barium will be in the sediment, since it is almost insoluble in water (0.2%).

3. Barium thiosulfate is filtered off and transferred to a gum box for hydrochloric acid treatment. When this happens the following reaction:

BaSaO, + 2HS1 BaOz + S + SOa +

The sulfur dioxide emitted is used again to convert sulfur barium to barium thiosulfate, and sulfur is filtered and used as such.

In view of the fact that during the treatment of VAZO, strong hydrochloric acid produces a supersaturated barium chloride solution, from which it crystallizes in an amount of about, and thus can be displaced with elemental sulfur, hydrochloric acid is pre-diluted with a hot (up to 80) solution barium chloride (1 part hydrochloric acid, 4 parts barium chloride at 80). In this case, when dissolving, the resulting heated chlorbari solution does not crystallize yet, sulfur is filtered off, the filtrate enters crystallization, some of the product crystallizes out of the filtrate when cooled, part of the mother liquor is fed to the evaporation, and some to the next operation.

The subject matter of the invention.

The method of producing barium chloride and sulfur, characterized in that the barium sulphide solution is first treated with sulfuric anhydride, the resulting product is filtered and treated with hydrochloric acid.