Kinetics of ferric chloride leaching of high arsenic-bearing silver-gold concentrate has been investigated in the temperature range of 60 to 90 deg C. The results show that the extraction of silver has much to do with the dissolution of copper minerals, which was conducted through the formation of an intermediate product layer. The diffusive resistance of silver ion passing through the intermediate layer decreased with increasing temperature. The apparent activation energies of ferric chloride leaching of the copper and silver minerals are 374-41.15 kJ/mol and 92.6-95.9 kJ/mol, respectively. The dissolving behavior of arsenopyrite was attributed to electrochemical mechanism based on the formation of Ag_2S/FeAsS galvanic cell, and the dissolving behavior of antimony-bearing minerals was also discussed by means of the dimensionless time method.
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