Comprehensive utilization method of arsenious waste hydrochloric acid
A technology of waste hydrochloric acid and benzylarsinic acid is applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc., to achieve the effects of low production costs, improved economic benefits, and solutions to environmental problems
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Embodiment 1
[0014] A method for comprehensive utilization of arsenic-containing waste hydrochloric acid, the method steps are as follows:
[0015] (1) 2000L of alkaline sodium benzyl arsenic acid mother liquor is added in the neutralization tank, then the arsenic-containing waste hydrochloric acid containing 17g / L of arsenic content, organic matter content of 1 / 86v / v, and mass concentration of 28% is slowly Add it into the neutralization tank, control the neutralization temperature below 50°C, start stirring, neutralize to pH 2-3, and precipitate benzyl arsenic acid;
[0016] (2) Dehydrating the precipitated benzyl arsenic acid to obtain the benzyl arsenic acid product; the dehydrated arsenic-containing waste liquid is desalted through vacuum distillation and crystallization, and the distillate is reused to prepare sodium arsinate solution.
[0017] The actual yield of benzyl arsenic acid was 96.2%, and 1018L of waste hydrochloric acid containing arsenic was consumed.
Embodiment 2
[0019] (1) 2000L of alkaline sodium benzyl arsenic acid mother liquor is added in the neutralization tank, then the arsenic-containing waste hydrochloric acid containing 14g / L of arsenic content, organic matter content 1 / 93v / v, and mass concentration of 31% is slowly Add it into the neutralization tank, control the neutralization temperature below 50°C, start stirring, neutralize to pH 2-3, and precipitate benzyl arsenic acid;
[0020] (2) Dehydrating the precipitated benzyl arsenic acid to obtain the benzyl arsenic acid product; the dehydrated arsenic-containing waste liquid is desalted through vacuum distillation and crystallization, and the distillate is reused to prepare sodium arsinate solution.
[0021] The actual yield of benzyl arsenic acid was 97.3%, and 986L of waste hydrochloric acid containing arsenic was consumed.
Embodiment 3
[0023] (1) 2000L of alkaline sodium benzyl arsenic acid mother liquor is added in the neutralization tank, then the arsenic-containing waste hydrochloric acid containing 15g / L of arsenic content, organic content 1 / 81v / v, and mass concentration of 20% is slowly Add it into the neutralization tank, control the neutralization temperature below 50°C, start stirring, neutralize to pH 2-3, and precipitate benzyl arsenic acid;
[0024] (2) Dehydrating the precipitated benzyl arsenic acid to obtain the benzyl arsenic acid product; the dehydrated arsenic-containing waste liquid is desalted through vacuum distillation and crystallization, and the distillate is reused to prepare sodium arsinate solution.
[0025] The actual yield of benzyl arsenic acid was 95.3%, and 1327L of waste hydrochloric acid containing arsenic was consumed.
[0026] The alkali-containing sodium benzyl arsenate mother liquor described in the foregoing embodiments of the present invention is obtained by reacting ar...
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