چكيده به لاتين
Abstract:
Acid leaching process of oxide copper ore of Sungun mine with 1.28% copper content was investigated in bottle roll tests, with the goal of kinetic model determination and optimization of the process. Azurite and Malachite were recognized as main copper compositions in XRD analysis. Kinetic model of this process was determined duffision-controlled and was best fitted to D12 equation (R2=0.977). This equation assumes that the activities of the reactants control the diffusion. Optimization was carried out using two softwares, namely Minitab 16 and Design Expert 7 and taking particle size, rolling speed, sulfuric acid concentration and pulp density as the process variables. The model obtained includes all linear, interaction and quadratic terms with R2, adjusted R2 and predicted R2 of 0.95, 0.91 and 0.84, respectively. The optimized condition, targeting maximized extraction, includes particle size 3.94 mm, rolling speed 120 rpm, acid concentration 12 g/l and pulp density 120 g/l, which results in Cu extraction of about 93%.
Keywords: oxide copper ore, design of experiments, leaching kinetics, bottle roll, process optimization
