FIELD: metallurgy.
SUBSTANCE: initial productive solution is clarified in filter and deoxygenated in deaerator. Then, solution is proportioned by zinc powder and sodium cyanide. Formed pulp is fed to settling filter to produce precipitate. Produced precipitate is dried by drying agent to obtain liquid condensate to be heated by wet drying off-gases with subsequent separation of liquid and gas phases, liquid phase clarification by separation of dust entrapped by off-gases in precipitate drying, and forced circulation of fluid in closed circuit to subsequent heating of productive solution.
EFFECT: higher extraction efficiency.
2 cl, 1 dwg
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