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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 2    No. 1    February 1992

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LEACH OUT GOLD AND SILVER FROM SULFIDE CONCENTRATE CONTAINING COPPER WITH CYANIDE AND AMMONIA SOLUTIONS
Fang Zhaoheng1  Muhammed, M2

1.Institute of Chemical metallurgy, Academia Snica, Being 100080;
2.Royal Institute of Technololgy, Sweden

Abstract:A cyanidation leaching process for a sulfide concentrate containing gold and silver with ammonia and other complexes was investigated, and its potential in decrease of cyanide consumption was examined. The equilibria behaviors of copper and other metal ions in the CN-NH3 H2O system and the CN-NH3 EDTA-H2O system were analyzed by a microcomputer program. Experiments revealed that the leaching yield of gold in ammonia-cyanide solutions was raised from 86% to 99% from addition of EDTA in a certain concentration and its cooperative action with ammonia op the cyanidation of gold. Meanwhile,the leaching yield of silver was significantly increased From about 200% to 550% and the consumption of cyanide was decreased.

 

Key words: gold, silver, sulfide, cyanidation leaching

ISSN 1672-7029
CN 43-1423/U

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