GOLD AND SILVER EXTRACTION FROM PERSISTENT ARSENOPYRITE GRAVIOCONCENTRATE
V. K. VARENTSOV, V. I. VARENTSOVA
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: арсено-пиритный гравиоконцентрат, механохимическая активация, выщелачивание, электроизвлечение, золото, серебро, промышленные испытания, углеродные волокнистые электроды, arsenopyrite gravioconcentrate, mechanochemical activation, leaching, electroextraction, gold, silver, industrial tests, carbon fibre electrodes
Pages: 257-261
Abstract
Results of the studies of gold and silver extraction from persistent arsenopyrite geavioconcentrate are presented, starting with mechanochemical breakdown of the concentrate, subsequent cyanide leaching, electrolytic extraction of the metals from cyanide solutions, and ending with obtaining the finished products in the form of metal alloy. The cycling use of cyaniic solutions after electrolysis in leaching process is evaluated. Electrolytic extraction of gold and silver was carried out on the cathodes made of carbon fibre materials, followed by thermal treatment. The final products with gold and silver content up to 95 mass % were obtained. The results of subsequent industrial tests at a gold production plant showed that the use of mechanochemical breakdown and an experimental-industrial activator to obtain gold and silver from persistent arsenopyrite gravioconcentrates of the deposits situated in the north-eastern part of Kazakhstan allows an increase in the ate and degree of gold and silver extraction.
DOI: 10.15372/CSD2019135
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