韋群燕1， 姜建準(zhǔn)2， 李奇?zhèn)?SUP>3
(1. 云南大學(xué) 化學(xué)與材料工程學(xué)院， 昆明 650091；
2. 北京大學(xué) 化學(xué)與分子工程學(xué)院， 北京 100871；
3. 昆明貴金屬研究所， 昆明 650221)
摘 要: 應(yīng)用先轉(zhuǎn)化后還原的方法對(duì)CTAB-30%TBP載金有機(jī)相進(jìn)行了反萃取研究，并以198Au作為示蹤劑對(duì)有機(jī)相和水相中的Au（Ⅰ）進(jìn)行檢測(cè)。 結(jié)果表明：用濃度為5.90mol/L鹽酸與載金有機(jī)相在帶冷凝管的燒瓶中加熱2h后， 載金有機(jī)相中33%左右的Au（Ⅰ）沉淀為金片析出， 其余67%的Au（Ⅰ）可能以(AuCl↓2)↑- 或(Au(Cl)4)-的氯配離子形式存在， 被轉(zhuǎn)化后的載金有機(jī)相可以用亞硫酸鈉或草酸銨等直接還原， 總反萃率可接近于100%。
關(guān)鍵字: 載金有機(jī)相； 堿性氰化液； 十六烷基三甲基溴化銨；磷酸三丁脂； 反萃取
by transformation and reduction
ZHOU Wei-jin2, WEI Qun-yan1, JIANG Jian-zhun2, LI Qi
（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
