Model-Based Optimization of Copper Complexes Adsorption in Ammoniacal Thiosuphate Resin Solution System
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This adsorption of copper using resin from thiosuphate leaching is a promoting process in gold extraction replacing carbon in cyanide process. A simultaneous model for the adsorption of copper complexes on resin in Ammoniacal Thiosuphate Resin Solution (ATRS) system has been developed by considering both reaction mechanism in solution and on resin, and using the multi-dimensional Newton-Raphson and Levenberg-Marquardt methods. The proposed model was simulated and validated using experimental data. As a result, the proposed model was in a very good agreement (R2 = 0.94). In addition, equilibrium constants associated with the exchange reactions of copper complexes on resin were obtained. The effect of independent variables on the adsorption of copper has been investigated based on the model simulation wherein the concentration of copper on resin exponentially decreased with the increase in equilibrium concentration of thiosuphate in solution. An optimization approach based on the proposed model was taken into account to maximize the concentration of most dominant copper complex of Cu(S2O3)23− on resin, and to obtain the optimal condition in the ATRS system with minimized reagent.
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