SU592748A1 - Method of preparing arsenic and sulfur sulfide - Google Patents

Description

working solution in the second stage at 140-150 ° C and a pressure of 5 atm.

The difference of the proposed method lies in the fact that the heating of the circulating solution in the first stage is carried out at 80-85 ° C under an agm pressure in the presence of an autoclave liquid.

The proposed method makes it possible to reduce the content of ballast salts in the circulating solution to 270 g / l and reduce the duration of the precipitation process to 0.5-1.0 h, increase the sulfur yield by 4.3% and eliminate harmful emissions.

Example. Circulating solution of desulfurization of coke oven gas composition, arsenic compounds; calculated on arsenic trioxide 1: 8.2; sodium compounds in active form in terms of soda 18.4; sodium thiosulfate 198.1; Rodanist sodium 121.3; politionaty in terms of tritioat 7.8; sodium sulfate 18.8, with a pH of 7.6 in an amount of 50 l / h, is purged with air in the regenerator. The resulting suspension of sulfur is melted in an autoclave to produce sulfur in an amount of 16.3 g and an autoclave liquid of composition, g1l: arsenic compounds in terms of arsenic trioxide 9.4; sodium thiosulfate 109.1; Rodanist sodium 79.0; politionate compounds in terms of tritionate 7.4; sodium sulfite 3.5; sodium polysulfide 58,4; sodium sulfate 15.7.

Autoclaved liquid is added to the circulating solution introduced from the hydrogen sulfide and hydrogen cyanide working cycle. The composition of the mixture of solutions, g1l t-item.a sh, fir-tree 0.94; thiosulfate "atri 171.0; politionaty in terms of tritionat 10.7; mouse connections in terms of trehd.mya kash 14.8; Rodanist sodium 105.7; sodium sulfate 45.5; sodium lolisulfide 35.1. To the mixture of solutions obtained in a volume of 50 liters heated to 85 ° C, 3.2 kg of 75.6% sulfuric acid are added and decomposition is carried out under a pressure of 5 atm. The resulting mouse tri-sulfur mouse is separated from the solution after 30 min.

The solution freed from the mouse is heated to 150 ° C under a pressure of 5 atm. As a result, an additional 6.1 kg of sulfur and 47.5 liters of the composition solution are obtained, g / l: sodium sulfate, li61.8; politionaty (absence); sodium thiosulfate 9.65; mouse compounds in terms of mouse trioxide and 0.4.

The pulp of the three-sulfurous mouse is filtered, after which the paste is dissolved in soda solution and a working solution of the composition is obtained, the compounds of the mouse in terms of arsenic trioxide 40; sodium compounds in active form in terms of soda 42 used to flush the raw coke oven gas from hydrogen sulphide and

hydrogen cyanide.

Claims (3)

Invention Formula A method for producing mouse sulphide and sulfur, including purging the solution of a mouse for water desulfurization of coke oven gas with air, separating the sulfur suspension from the working solution, melting the sulfur with the output of autoclave liquid and processing the circulating solution of sulfuric acid when heated in two stages at 140-150 ° C and a pressure of 5 atm, in the second stage with the separation of sulfide from the filtrate. Mouse 1ka in the first stage and residual sulfur in the second, about t and ch and y with the fact that, in order to reduce the content of ballast salts in the circulating solution and the duration of the deposition process, increase the sulfur yield and eliminate harmful emissions, heating the circulating solution at the first stages are carried out at 80-85 ° C under a pressure of 5-6 atm in the presence of an autoclave liquid from (Melting of sulfur. Sources of information taken into account in the examination of the invention: L. Kratka Chemical Encyclopedia, Publishing House of Sovetsk Encyclopedia, 1965, Vol. 4, p. 802. 2. The copyright certificate number 316314, cl. From 01 to 17/00; From 01 to 27/00, 07/18/1969. 3. Chemical Industry, Goskhimizdat, 1950, No. 6, p. 6-7.