含铟氧化锌烟尘加压硫酸浸出工艺优化

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

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 m L/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.

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 m L/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.