(1. 云南大学 化学与材料工程学院， 昆明 650091；
2. 北京大学 化学与分子工程学院， 北京 100871；
3. 昆明贵金属研究所， 昆明 650221)
摘 要: 应用先转化后还原的方法对CTAB-30%TBP载金有机相进行了反萃取研究，并以198Au作为示踪剂对有机相和水相中的Au（Ⅰ）进行检测。 结果表明：用浓度为5.90mol/L盐酸与载金有机相在带冷凝管的烧瓶中加热2h后， 载金有机相中33%左右的Au（Ⅰ）沉淀为金片析出， 其余67%的Au（Ⅰ）可能以(AuCl↓2)↑- 或(Au(Cl)4)-的氯配离子形式存在， 被转化后的载金有机相可以用亚硫酸钠或草酸铵等直接还原， 总反萃率可接近于100%。
关键字: 载金有机相； 碱性氰化液； 十六烷基三甲基溴化铵；磷酸三丁脂； 反萃取
by transformation and reduction
（1. College of Chemistry and Materials Engineering,
Yunnan University, Kunming 650091, China;
2. College of Chemistry and Molecular Engineering,
Peking University, Beijing 100871, China;
3. Institute of Precious Metals, Kunming 650221, China）
Abstract:The stripping of gold from gold loaded organic phase of CTAB-30%TBP was investigated by gold loaded organic phase transformation and followed reduction. 198Au was used as radioactive tracer to determine Au(Ⅰ) concentration in organic and aqueous phases. The results show that 33% Au(CN)-2 is extracted from the organic phase precipitate as gold, and the rest 67 % Au(CN)-2 is transformed to AuCl-2 or AuCl-4 after the gold loaded organic phase with 5.90mol/L HCl, heated for 2h. The transformed organic phase can be reduced by Na2SO3 or (NH4)2C2O4, and the total stripping rate reaches 100%.
Key words: gold loaded organic phase; alkaline aurocyanide solution; CTAB; TBP; stripping
