FIELD: metallurgy.
SUBSTANCE: invention relates to non-ferrous metallurgy and can be used in obtaining cadmium oxide from industrial products of zinc production, particularly, from a cadmium sponge. Leaching of the sponge, cadmium extraction and calcination of the deposit are executed. Leaching is executed in two stages, using sodium hydroxide in the first stage in an amount of 200 to 300% of the weight content of zinc in the sponge. After zinc leaching, cadmium is sent to the second stage of leaching in sulfuric acid. Cadmium extraction from a solution of cadmium sulfate is executed with a solution of sodium hydroxide at pH=11.5 to 12.0. Calcination of the deposit, cadmium hydroxide, is executed at a temperature of 300 to 350°C.
EFFECT: implementation of the purpose is ensured while excluding the operation of electrolysis and reducing natural gas consumption.
1 cl, 3 tbl, 1 dwg
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