SU833549A1 - Method of purifying sulfuric acid solutions from arsenic - Google Patents

Description

(54) CEPHOKHCJbK SOLUTION CLEANING METHOD

FROM MDA KA Preferably, an alkali metal sulphide is introduced in an amount of 5-10 parts by weight. on 1 weight. mouse, and barium chloride or calcium in the amount of 0.07–0.36 parts by weight. on 1 weight. 50, Example. The solution to be purified is a simulating solution formed during the wet cleaning of mice with tin-smelting gases containing gaseous mice and containing 1.6 g / l of mouse; 91.5 mg / l of iron; 8.7g / l zinc; 81 g / l of sulphate (in terms of S0) at pH 0.5 oo is treated with sodium sulphide and calcium chloride. The results of processing are given in table.1. T a b l and c a 1

The data show that during precipitation of the mouse with sodium sulfide without the addition of calcium chloride (experiments 1, 3, 6 and 8), the concentration of the mouse in the solution decreases to 3.5-2.0 mg / l with a ratio of .5: As 5-10: 1. A further increase in the alkali metal sulphide dose does not lead to a deepening of the degree of purification. The administration together with NajS kashtsi chloride in an amount of 0.07 wt.h. on 1 weight. and

1 2 3

I, above (experiments 5, 7 and 9) leads to

a decrease in the concentration of the mouse in rastQ thief to 0.0-0.5 mg / l. Increase

doses of calcium chloride above 0.36 weight parts. on 1 weight. S0j leads to an increase in the volume of precipitates deposited, and therefore impractical.

Example 2. The same solution as in Example 1 was treated with sodium sulfide and barium chloride oi. The results of processing are given in table. 2

. .Table 2

3.50

Claims (3)

0.025 0.60 0.55 0.050 From the data obtained it follows that the control experiments (1 and 5) confirm the results obtained in the previous series of experiments (Table 1). The additive is combined with sodium sulfide barium chloride at the rate of 0.075 parts by weight per 1 part by weight. $ 04 leads to a decrease in the concentration of the mouse in the solution from 3.5–2 mg / l to 0.5 mg / l. Thus, with the implementation of the proposed method, the degree of purification of solutions from the mouse (up to 0.0-0.5 mg / l) is achieved more deeply without increasing the volume of the precipitate produced during the process, which allows the use of purified solutions in the cycle wet gas cleaning system. and, if necessary, withdraw part of the solution from the system to the production sewer network of the avenue. Claims 1. Method for purification of sulphate solutions From a mouse by treatment 8335496. Continued table. 2 alkali metal sulphides, characterized in that, in order to increase the degree of purification, the treatment is carried out in conjunction with calcium chloride or barium. 2 i The method of claim 1, wherein the alkali metal sulphide is introduced into the processed solution in an amount of 5-10 parts by weight. on 1 weight. mouse, and calcium chloride (barium) in the amount of 0.07–0.36 parts by weight. on 1 weight. sulfate ion. Sources of information taken into account in the examination of 4 1. Copyright certificate USSR № 444406, cl. C 02 C 5/02, published 1971. 2. The patent of Germany 1159399, CL. 85 With 2, pub. 1968. 3. The patent of Japan 51-37628, cl. 13/7 / A2, publ. 1976 (prototype).