Reducing cyanide consumption in gold recovery from finely ground sulphide ores and concentrates
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United States of America Patent
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Feb 10, 2009
Grant Date -
Aug 24, 2006
app pub date -
Oct 22, 2003
filing date -
Nov 6, 2002
priority date (Note) -
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Abstract
Precious metals such as gold can be extracted from a refractory ore using a conventional cyanide leaching step and with reduced cyanide consumption by pre-treating the ore prior to cyanide leaching. The refractory ore is pretreated by fine grinding and an initial leaching step which uses inexpensive limestone and lime to maintain the initial leach relatively alkaline. Oxygen is added to the initial leaching step and the conditions are carefully controlled to only partially oxidize the ground ore to between 9-15%. The initial leaching step can be carried out at temperatures of less than 100 degrees C. and at atmospheric pressures. The pre-treated ore is then leached by a conventional cyanide leaching step to recover the precious metal and cyanide consumption can be reduced by more than two thirds.
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