从硬锌渣中综合回收锌铟锡试验研究

Recovering of Zinc,Indium and Tin From Hard Zinc Slag by Alkaline-acid Cooperating Leaching

针对火法炼锌过程中产出的硬锌渣,研究了中性浸出锌—浓硫酸熟化水浸铟—碱浸锡,考察了物料粒度、液固体积质量比、体系酸度对锌、铟、锡浸出率的影响。结果表明：在硬锌渣粒度小于200目、液固体积质量比4∶1、反应终点pH为5.0~5.5、反应时间2h、室温、中性浸出条件下,锌浸出率为93%;在反应温度85℃、液固体积质量比8∶1、体系酸度100g/L、反应时间4h条件下进行浓硫酸熟化浸出,铟浸出率达99.7%;在反应温度为室温、氢氧化钠浓度为2mol/L、液固体积质量比3∶1、反应时间2h条件下进行碱浸,锡浸出率达97%。锌、铟、锡得到较好回收。

The process of neutral leaching zinc-concentrated sulfuric acid curing and water leaching indium-alkali leaching tin from a hard zinc slag produced from zinc pyromentallurgy was researched. The effects of hard zinc slag particle size, ratio of liquid volume-to-solid mass and system acidity on leaching rate of zinc,indium and tin were examined. The results show that under the conditions of hard zinc slag particle size below 200 mesh,ratio of liquid volume-to-solid mass of 4 ： 1,and reaction ending pH of 5.0-5. 5, leaching rate of zinc is 93% after reacting for 2 h at room temperature by neutral leaching. When curing for 4 h using concentrated sulfuric acid at the conditions of ratio of liquid volume-to-solid mass of 8 ： 1 ,system acidity of 100 g/L then leaching for 4 h using water,the leaching rate of indium reaches 99.7%. When alkali volume-to-solid mass of 3 ： 1 with NaOH sol Zinc, indium and tin in the hard-zinc slag can eaching for 2 h at room temperature and ratio of liquid ution of 2 mol/L,the leaching rate of tin is about 97%. be recovered effectively.