Answers

2016-02-08T12:17:43+05:30
It is concentrated by leaching gold ore with KCN or NaCN and extracting pure metal ore with displacement reaction with Zn.

2Au+4CN+H2O+1/2O2------>2[Au(CN)2]+2OH

2[Au(CN)2]+Zn----->Zn(CN)2+2Au
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