硫酸-氯盐法浸出高铟氧粉酸浸渣中铜锌铅的试验研究

通过分析高铟氧粉酸浸渣的成分和物相特征, 发现其主要物相为Cu₂FeS₂、ZnSO₄、ZnS和PbSO₄, 由于成分复杂, 单一方法无法有效回收铜、锌、铅, 因此设计了硫酸-氯盐二段浸出法, 分别提取酸浸渣中铜、锌和铅。一段浸出采用硫酸浸出, 在始酸浓度60 g/L, 液固比5∶1, 氧化剂高锰酸钾用量4%, 浸出温度60 ℃条件下, 浸出2 h, 铜和锌浸出率分别达到84.29%和92.02%; 二段浸出采用氯盐浸出, 在NaCl浓度300 g/L, 液固比10∶1, pH＝1.5~2.0, 浸出温度90 ℃条件下, 浸出60 min, 铅浸出率达到91.14%。该法对铜、锌和铅都有很好的浸出效果。

Research on Leaching Cu,Zn and Pb from Acid Leaching Residues of High Indium Oxide Powder by Sulfuric Acid-chloride Method

It is found that Cu₂FeS₂, ZnSO₄, ZnS and PbSO₄ are the main phases in the acid leaching residues of high-indium oxide powder by analyzing the composition and phase characteristics of the residues. Single method can not effectively recover Cu, Zn and Pb due to the complex compositions. Therefore, two-stage sulfuric acid-chloride leaching method was adopted to recover Cu, Zn and Pb in the acid leaching residues. At the first stage, sulfuric acid leaching was carried out for 2 h at 60 ℃ with an initial H₂SO₄ concentration of 60 g/L, KMnO₄ dosage of 4% and liquid/solid ratio of 5∶1. The leaching rates of Cu and Zn were 84.29% and 92.02%, respectively. At the second stage, chloride leaching was carried out for 60 min at 90 ℃ with NaCl concentration of 300 g/L and liquid/solid ratio of 10∶1 and pH=1.5~2.0. The leaching rate of Pb was up to 91.14%. The results showed that the sulfuric acid-chloride leaching method has good leaching effects on Cu, Zn and Pb.