FIELD: hydrometallurgical processes; processing of sulfide products containing non-ferrous and noble metals.
SUBSTANCE: proposed method consists in bacterial-chemical leaching; moderately thermophilic bacteria Sulfobacillus are used in this method. Leaching is performed at two stages: first stage is carried out at intensity of mixing of 1-4 W/l without additional aeration at temperature of 60-80°C and pH of 1.6-1.7; second stage is performed at intensive aeration and mixing at volumetric coefficient of mass exchange by oxygen of 200-800-1 h at temperature of 50-55°C, pH of 1.3-1.5 and concentration of solid phase of 1-5%.
EFFECT: reduction of power requirements; high degree of extraction of non-ferrous metals.
1 ex
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