The Mechanism of the Ammonia-Cyanide System for Leaching Copper-Gold Ores

Society for Mining, Metallurgy & Exploration
David M. Muir Tong Deng Stephen R. La Brooy A. J. Monhemius E. Peters Pritam Singh G. W. Warren
Organization:
Society for Mining, Metallurgy & Exploration
Pages:
14
File Size:
523 KB
Publication Date:
Jan 1, 1993

Abstract

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The controlled addition of ammonia to cyanide solutions inhibits the leaching of copper minerals but extracts up to 80% Au using as little as 10% of the cyanide compared with conventional cyanidation of copper-gold ores. The solubility of copper minerals and copper speciation in solution is dependent on NH3, CN-, pH and Eh. Rotating disc and electrochemical studies show that gold is leached by a mixed Cu-CN--NH3 complex with either Cu(II) or O2 as oxidant. This complex is slowly oxidised to CuCN and Cu(OH)2 by air.
Citation

APA: David M. Muir Tong Deng Stephen R. La Brooy A. J. Monhemius E. Peters Pritam Singh G. W. Warren  (1993)  The Mechanism of the Ammonia-Cyanide System for Leaching Copper-Gold Ores

MLA: David M. Muir Tong Deng Stephen R. La Brooy A. J. Monhemius E. Peters Pritam Singh G. W. Warren The Mechanism of the Ammonia-Cyanide System for Leaching Copper-Gold Ores. Society for Mining, Metallurgy & Exploration, 1993.

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