复杂烟尘高效浸出铟的工艺研究

以某公司复杂含铟烟尘为原料, 分别研究了氧化酸浸和硫酸化焙烧-水浸两种浸出铟工艺。氧化酸浸工艺主要考察了初始硫酸酸度、液固比、浸出温度、反应时间、氧化剂添加量等因素对铟浸出效果的影响; 硫酸化焙烧-水浸工艺主要考察了硫酸用量、焙烧温度、焙烧时间等因素对铟浸出效果的影响。实验结果表明, 在初始硫酸浓度6.0 mol/L, 液固比6∶1, 浸出温度90 ℃, 浸出时间3 h, 氧化剂H₂O₂添加量为12%条件下进行氧化酸浸, 铟浸出率由常规酸浸的46.5%提高到70%; 在硫酸用量1.0 mL/g, 焙烧温度300 ℃, 焙烧时间2 h条件下进行硫酸化焙烧-水浸, 铟浸出率达到92%, 实现了铟的高效浸出。

Processes for Leaching Indium Efficiently from Complex Dust

With some complex dust containing indium as raw material, a study was made on two processes for indium leaching such as oxidizing acid leaching and sulfating roasting-water leaching. For the oxidizing acid leaching process, an investigation was made on the effects of initial H₂SO₄ concentration, liquid/solid ratio, leaching temperature and time and oxidant dosage on the leaching rate. For the sulfating roasting-water leaching process, an investigation was made on the effects of H₂SO₄ dosage, roasting temperature and time on the leaching rate. The results showed that under the condition of initial H₂SO₄ concentration of 6.0 mol/L, liquid/solid ratio of 6∶1, leaching temperature of 90 ℃, leaching time of 4 h and hydrogen peroxide dosage of 12%, the leaching rate by oxidizing acid leaching increased to 70% from 46.5% by conventional acid leaching. Under the condition of H2SO4 dosage of 1.0 mL/g, roasting temperature of 300 ℃ and roasting time of 2 h, the leaching rate by sulfatizing roasting-water leaching is 92%. Efficient leaching of indium from complex dust is realized.