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In this study, changes in physicochemical properties and leachability of  indium from mechanically activated hard zinc residue by planetary mill were  investigated. The results showed that mechanical activation increased  specific surface area, reaction activity of hard zinc residue, and decreased  its particle size, which had a positive effect on indium extraction from hard  zinc residue in hydrochloric acid solution. Kinetics of indium leaching from  unmilled and activated hard zinc residue were also investigated,  respectively. It was found that temperature had an obvious effect on indium  leaching rate. Two different kinetic models corresponding to reactions which  are diffusion controlled, [1-(1- x)1/3]2=kt and (1-2x/3)-(1-x)2/3=kt were  used to describe the kinetics of indium leaching from unmilled sample and  activated sample, respectively. Their activation energies were determined to  be 17.89 kJ/mol (umilled) and 11.65 kJ/mol (activated) within the temperature  range of 30°C to 90°C, which is characteristic for a diffusion controlled  process. The values of activation energy demonstrated that the leaching  reaction of indium became less sensitive to temperature after hard zinc  residue mechanically activated by planetary mill

Study on indium leaching from mechanically activated hard zinc residue