Recovery of refractory gold using a combination omli process...

Details Recovery of refractory gold using a combination omli process... Recovery of refractory gold using a combination omli process...

C - Chemistry, Metallurgy

22

B

53/229

C22B 11/08 (2006.01)

Patent

CA 1327273

ABSTRACT A process is disclosed for recovering gold from refractory gold-bearing materials which are treated by froth flotation in a combination flotation collector comprising 5% to 20% sulfhydric collector and 80% to 95% fatty acid collector and a pulp pH range from 5 to 8 to produce gold-bearing concentrate. This concentrate is heated at a temperature in excess of 250° C. for a time period of at least one hour and preferably four hours. The heated concentrate is then subjected to water scrubbing and agitation leaching In cyanide solution. The preferred temperature range for the heating step is 360° C. to 450° C.

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