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对湿法炼锌净化渣的浸出动力学进行了研究,并探讨了硫酸浓度、反应温度、粒度等对钴、锌浸出率的影响规律。从动力学的角度分析了整个浸出过程,得到优化条件:液固比50:1(mL/g),硫酸浓度100 g/L,反应温度70°C,粒度75~80μm,反应时间20 min。在此优化条件下钴的浸出率为99.8%,锌的浸出率为91.97%。结果表明:在硫酸体系中钴的浸出符合不生成固体产物层的“未反应收缩核”模型。通过Arrhenius经验公式求得钴和锌表观反应活化能分别为11.693 kJ/mol和6.6894 kJ/mol,这表明浸出过程受边界层扩散控制。
The leaching kinetics of zinc purification residue was studied. The effects of sulfuric acid concentration, reaction temperature and particle size on leaching rate of cobalt and zinc were also discussed. The whole leaching process was analyzed from the viewpoint of kinetics. The optimum conditions were obtained: liquid-solid ratio of 50: 1 (mL / g), sulfuric acid concentration of 100 g / L, reaction temperature of 70 ° C, particle size of 75-80 μm and reaction time of 20 min. Under the optimum conditions, the leaching rate of cobalt is 99.8% and the leaching rate of zinc is 91.97%. The results show that cobalt leaching in sulfuric acid system is in accordance with the model of “unreacted contractile core” which does not produce solid product layer. The Arrhenius empirical formula determined the apparent activation energies of cobalt and zinc as 11.693 kJ / mol and 6.6894 kJ / mol, respectively, indicating that the leaching process is controlled by the diffusion of the boundary layer.