材料期刊网

铜阳极泥的盐酸?氯气氧化性浸出会导致大量杂质元素如 Fe、Cu、Pd、Se 等的溶解。以 TBP 作为萃取剂，采用标准的溶剂萃取实验方法，等体积有机相和水相来萃取分离 Au、Pd、Pt、Fe、Cu 和 Se 等元素，研究TPB 浓度、HCl 和氯离子浓度对杂质分离效果的影响。结果表明，在有机相中 TBP 浓度为0.25 mol/L、水相中HCl 浓度为2.5 mol/L 的条件下，可以得到高的金萃取率。同时，其他杂质元素的萃取可以忽略不计。对负载有机相采用蒸馏水进行洗涤，可以去除部分杂质元素。采用硫代硫酸钠溶液进行反萃，反萃液中不含任何杂质元素。在反萃液中加入硫酸，反应产生的 SO2气体可还原金离子。

The oxidative leaching causes to dissolve various impurities such as Fe, Cu, Pd, Se in copper anode slime. Organic extractant tri-butyl phosphate (TBP) was used to purify leach solution. Several parameters, such as TBP, HCl and chloride inorganic salt concentrations were chosen in order to determine efficient state for impurities separation. Standard solvent extraction tests for extraction and separation of Au, Pd, Pt, Fe, Cu and Se were conducted with equal volume of aqueous and organic phases in batch experiments. The effect of hydrochloric acid, organic phase and metals initial concentration were examined at ambient temperature. It was found that 0.25 mol/L TBP in the presence of 2.5 mol/L hydrochloric acid can cause high extraction of gold. Meanwhile, in these conditions the extraction of other impurities is negligible. After extraction, pregnant organic phase was scrubbed by distilled water and some impurities were removed. Finally, gold was stripped by sodium thiosulfate solution. The stripping solution does not have any impurities. By adding H2SO4 to stripping solution containing Na2S2O2, SO2 gas is released and Au3+ ions could be reduced.