Method for thiosulfate leaching of precious metal-containing materials
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United States of America Patent
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Jul 14, 2009
Grant Date -
May 8, 2008
app pub date -
Oct 29, 2007
filing date -
May 19, 2000
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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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