兰坪难选氧化锌矿氨浸动力学

Study on Kinetics of Ammonia Leaching of Refractory Zinc Oxide Ore in Lanping

针对兰坪氧化锌矿的特点,对氧化锌矿的氨浸动力学进行了研究。研究了氧化锌矿氨浸的机理以及氨水的浓度、温度和矿石粒度对难选氧化锌矿浸出过程的影响。结果表明,氧化锌矿氨浸属不生成固体产物层的"未反应核缩减型"模型,动力学方程遵从1-(1-α)1/3=kct/ρr0,浸出过程为边界层控制,提高氨水的浓度、温度以及降低矿石粒度,均可加速锌的浸出速度,提高浸出率。

Based on the characteristics of oxide zinc ore in Lanping,the kinetics of ammonia leaching of oxide zinc ore is studied.The study involves the mechanism of ammonia leaching and the influence of concentration and temperature of ammonia water,and the grain size of ore on the leaching process.The results showed the ammonia leaching of zinc oxide ore belongs to'un-reactive atrophic nuclear'model free from solid product layer.The kinetic equation is:1-(1-α)1/3=k ct/ρr0.The leaching process is boundary layer controlled;the leaching rate and leaching recovery can be increased by means of increasing the concentration of ammonia solution and decreasing the grain-size of ore.