LEACHING KINETICS OF Au-BEARING SULPHIDE CONCENTRATE BY FeCl_3 SOLUTION
FeCl3浸取含Au复杂硫化矿的动力学研究

A process extracting Cu, Ag, Pb and Zn from a bulk sulphide concentrate with FeCl_3 solutions was investigated. The kinetics of the process and effective parameters were examined based on a model of non-reaction shrinking core and an approach of non-linear regression. It was found that the rate of Cu dissolution in the process was controlled by a sur- face reaction which was a half order with respect to Fe~(3+) ions and zero order with respect to Cl_-ions. More than 96% Cu, 95% Ag, 90% Pb and 9l% Zn were extracted while over 70% sulphide were converted to elemental S and more than 97% of Au were left in the leached residue under the conditions studied. Thus, the leaching process by FeCl_3 and NaCl solution was a more potential technology for pre-treating of Au-bearing sulphide concen- trate and recovery of valuable metals.