FIELD: chemistry.
SUBSTANCE: method includes magnetic separation of the concentrate, calcareous treatment of the non-magnetic fraction and cyanidation. In this case, the pulp after lime processing is subjected to filtration with washing of the cake on the filter with water. A filtrate, which contains sulfur-containing impurities harmful to the cyanidation process, is sent to ore preparation or discharged to the tailing pond. The washed cake is pulped with a reverse cyanide solution and cyanated with subsequent filtration.
EFFECT: reduction of NaCN consumption for cyanidation of the non-magnetic fraction of the concentrate.
1 tbl, 2 ex
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