Recovery of precious metals from difficult ores

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

1979-12-28

1981-05-26

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75101R, 75118R, 75121, 423 32, 423 33, C22B 1104

Patent

active

042696224

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 7.5, and at least 0.05% sulfite ion.

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