FIELD: metallurgy.
SUBSTANCE: process can be used in hydrometallurgy for processing of gold-bearing two-fold hardness concentrates, that is, stock containing gold dispersed in sulphides and organic carbonaceous substance. Prior to feeding the concentrate acid pulp produced by pre-treatment of concentrate with acid into autoclave is cleaned of chlorides. Autoclave leaching is conducted at 225-235°C and terminated at reaching the pulp redox potential in the range of +700 - 730 mV relative to standard hydrogen electrode. For cleaning the pulp of chlorides at filter or at continuous return flow decantation hot condensate or natural water and/or desalinised water may be used. To maintain preset temperature at autoclave leaching cold fresh and/or reused water is fed to every section of autoclave.
EFFECT: higher gold yield.
4 cl, 7 dwg, 3 tbl, 2 ex
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