Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Reexamination Certificate
2006-06-27
2006-06-27
Kastler, Scott (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C423S027000, C423S029000
Reexamination Certificate
active
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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Fleming Christopher Andrew
Hackl Ralph Peter
Ji Jinxing
West-Sells Paul George
Kastler Scott
Placer Dome Technical Services Limited
Sheridan & Ross P.C.
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