Method for thiosulfate leaching of precious metal-containing...

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

Reexamination Certificate

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C423S027000, C423S029000

Reexamination Certificate

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07066983

ABSTRACT:
Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.

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