含铟锌渣氧粉加压氧化浸铟的工艺研究

Research on the Process for Extracting Indium from Zinc Oxide Flue Dust by Pressure Oxidation Leaching

研究了含铟锌渣氧粉在加压和加入氧化剂的条件下与工业硫酸反应时硫酸初浓度、浸出时间、反应温度、氧化剂用量等工艺条件对铟浸出效果的影响。研究结果表明,加压和加入氧化剂高锰酸钾对锌渣氧粉的浸出有较好的强化作用,能明显提高铟浸出率。其最佳工艺条件:硫酸初浓度为400g/L,反应时间为120min,反应温度为120℃,高锰酸钾用量为矿样量的4%,液固比为8,反应压强为0.5MPa,搅拌器转速为400r/min。在此条件下,锌渣氧粉的铟浸出率可达到90.6%。

In the process of leaching zinc oxide flue dust containing indium using sulfuric acid as lixiviant by oxidative pressure leaching in an autoclave, the effects of initial concentration of sulphuric acid, reaction time, temperature and the dosage of oxidant on leaching efficiency of indium were studied. The experimental results showed that both pressurizing and using potassium permanganate as oxidant can strengthen the indium extraction from zinc oxide flue dust. The leaching efficiency of indium was improved effectively by oxidative pressure leaching. The optimum conditions of pressure leaching were determined as 400 g/L sulfuric acid for 120 min at 120℃with the dosage of oxidant was 4% of flue dust, and the stirring speed, ratio of liquid to solid, gauge pressure were 575 r/min, 8： 1, and 0.5 MPa, respectively. As a result, the leaching rate of indium can reach 90.6% under these optimum conditions.