Process for obtaining access to refractory gold and/or...

Details Process for obtaining access to refractory gold and/or... Process for obtaining access to refractory gold and/or...

C - Chemistry, Metallurgy

22

B

C22B 11/08 (2006.01) C22B 1/02 (2006.01) C22B 11/02 (2006.01)

Patent

CA 2183124

A process for obtaining access to refractory gold and/or silver carried by arsenopyrites and/or arsenical pyrites comprises first heating dry ore concentrate containing arsenopyrites and/or arsenical pyrites at a temperature from 450°C to 850°C in an oxidizing atmosphere of sulfur devoid of free oxygen to volatile the larger part of arsenic from the starting ore and then roasting the non-volatile residue at a temperature of 850°C or less leaving a residue of iron oxide substrate from which gold may be retrieved by cyanide extraction.

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