FIELD: metallurgy.
SUBSTANCE: procedure consists in reduction of arsenic containing compounds with successive extraction of target product. Also, source compounds are preliminary treated with solution of sodium hydroxide to pH not less, than 8. For reduction dioxide of Thiourea is used as a reducer at temperature 20-110°C in alkali medium. As arsenic containing compounds there are used arsenic oxides (III) or (V), or arsenic salts (III) or (V) or their mixtures.
EFFECT: increased contents of basic substance in target product, facilitation of ecological safety of process and reduced expenditures for cleaning emissions and rejects.
2 cl, 5 ex
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