LEACH OUT GOLD AND SILVER FROM SULFIDE CONCENTRATE CONTAINING COPPER WITH CYANIDE AND AMMONIA SOLUTIONS

来源期刊：中国有色金属学报(英文版)1992年第1期

论文作者：Fang Zhaoheng Muhammed M

文章页码：43 - 52

Key words：gold, silver, sulfide, cyanidation leaching

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.