机械活化强化锌渣氧粉铟浸出的工艺研究

Technology of Enhancing Indium Leaching from Zinc Slag Oxidation Dust by Mechanical Activation

研究了锌渣氧粉在机械活化装置中与工业硫酸反应时搅拌速度、酸初始浓度、液固比、浸出时间等工艺条件和不同浸出工艺方法对铟浸出效果的影响。研究结果表明,用机械活化方法浸铟时对浸出过程有较好的强化效果。综合考虑设备的生产能力和耗能特性,用搅拌磨活化浸出时优化的工艺条件为:活化反应时间150min,液固比8,酸初始浓度500g·L-1,搅拌速度575r·min-1。在此条件下,铟浸出率可由常规浸出时的68.0%提高到91.2%。

In the process of reaction of zinc slag oxidation dust with sulfuric acid by mechanical activation, the effects of different technical conditions and leaching process on leaching efficiency of indium were studied. The experimental results showed that the leaching efficiency of indium could be improved obviously by mechanical activation. Associating with the equipment of mechanical activation and the cost of energy, the optimum conditions for leaching indium by the mechanical activation during stirring mill were that the reaction time was 150 min, the ratio of liquid-solid 8, the initial concentration of sulfuric acid 500 g·L^-, the stirring speed 575 r·min^-1. Under the optimum conditions the leaching efficiency of indium which was 68.0% in conventional leaching process was improved to 91.2%.