FIELD: metallurgy.
SUBSTANCE: method involves agglomeration of mineral raw material, leaching of gold and further extraction of gold from the solution. Prior to leaching, fractional separation of mineral raw material is performed so that slurry fraction and the main volume of large-sized agglomerated mineral raw material is obtained. Slurry fraction is subject to photocatalytic cuvette leaching with mixed alkaline hypochlorite and hydrochloride solutions. Leaching of gold is performed from the main volume of large-sized agglomerated mineral raw material in stages using the solutions supplied through perforated pipes. Initially, leaching is performed in penetration mode using a concentrated cyanide solution. Then, after exposure period in diffusion mode, leaching is performed by supplying water and compressed air or weak solution of cyanides through perforated pipes.
EFFECT: increasing efficiency owing to improving the gold extraction and reducing the leaching time.
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