含铟氧化锌烟尘加压硫酸浸出工艺优化

对含铟氧化锌烟尘加压浸出进行正交实验及单因素实验，考察各因素对浸出的影响. 结果表明，各因素对铟浸出率的影响显著程度为初始硫酸浓度>液固比>压力>温度>时间，对锌浸出率为初始硫酸浓度>液固比>温度>时间>压力. 优化工艺条件为温度140℃，釜内压力0.6 MPa，时间90 min，液固比8 mL/g，初始硫酸浓度160 g/L，搅拌速率500 r/min. 该条件下锌和铟浸出率分别达99%和91%以上，锌与铟可同时高效浸出，浸出液残酸低，工艺稳定性好

Optimization of Pressure Leaching Process of Indium-bearing Zinc Oxide Dust with Sulfuric Acid

Pressure leaching of indium-bearing zinc oxide dust in sulfuric acid medium was studied by orthogonal experiments and single-factor experiments. The results showed that the important degree of various factors affecting the leaching rates of In followed the order of initial acidity > ratio of liquid to solid > pressure > temperature > time, and that affecting the leaching rate of zinc was the initial acidity > ratio of liquid to solid > temperature > time > pressure. The optimum conditions were obtained as the leaching temperature of 140℃, pressure 0.6 MPa, reaction time 90 min, ratio of liquid to solid 8 mL/g, initial acidity of 160 g/L, and stirring speed 500 r/min. Under the optimum conditions, the leaching rates of zinc and indium were over 99% and 91%, respectively, zinc and indium could be efficiently leached out with low content residual acid and good process stability.