Recovery of precious metals from difficult ores

Details Recovery of precious metals from difficult ores Recovery of precious metals from difficult ores

1980-10-20

1983-01-18

Peters, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75118R, 75121, 423 32, 423 33, 423514, C22B 1104

Patent

active

043690610

ABSTRACT:
Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.0, and at least 0.05% sulfite ion, sulfite and thiosulfate requirements being maintained by the reaction in situ of sulfur dioxide and elemental sulfur.

REFERENCES:
patent: 2219258 (1940-10-01), Hill
patent: 3843771 (1974-10-01), Urban
patent: 4070182 (1978-01-01), Genis-Sas-Berezowski et al.
patent: 4269622 (1981-05-01), Kerley, Jr.

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