FIELD: metallurgy.
SUBSTANCE: method involves leaching of cadmium from raw material in solution of sodium ethylene diamine tetraacetate with its further extraction from solution and regeneration of ethylene diamine tetraacetate. Cadmium leaching is performed in two stages. The solution obtained at the first stage is supplied for extraction of cadmium, and residue of the first stage is supplied to the second cadmium leaching stage. The solution obtained at the second stage is used for leaching of cadmium from raw material at the first stage. Besides, leaching at the second stage is performed in presence of hydrogen peroxide at maintaining its concentration in the range of 10-15 g/dm3 during 2-2.5 hours.
EFFECT: increasing cadmium extraction degree.
2 tbl, 2 ex
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