( 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: 以TBP為萃取劑， 用新型的柱狀萃取裝置對水相中加入與Au(I)等摩爾CTAB（十六烷基三甲基溴化銨）的低濃度氰化金溶液進行了萃取研究， 考察了水相中添加CTAB、 有機相TBP的體積、 鹽析劑NaCl濃度等對TBP萃取Au(I) 性能的影響以及載金有機相中金的反萃取。 結(jié)果表明： 在水相中添加CTAB后， TBP對低濃度金的萃取性能大幅度提高； 50 L含金濃度約為10 mg/L的氰化金溶液經(jīng)3級萃取試驗后， 金的萃取率大于95%， 萃余相濃度小于0.5×10-6。 用硫氰化鉀對含金濃度約為3 g/L的載金有機相進行了反萃取研究， 當(dāng)KSCN濃度大于3mol/L時， 對金的反萃率大于93%。
關(guān)鍵字: 萃取柱； KAu(CN)2； 十六烷基三甲基溴化銨； 磷酸三丁脂； 硫氰化鉀
WU Jin-guang2, LI Kai-zhong3, LI Qi-wei3
（ 1. College of Chemistry and Material,
Yunnan University, Kunming 650091, China;
2. College of Chemistry and Molecular Engineering,
Peking University, Beijing 100871, China;
3. Institute of Precious Metals, Kunming 6500221, China）
Abstract: The solvent extraction of trace gold(I) in alkaline cyanide solution by CTAB/TBP system was investigated using a new kind of extraction equipment. Various parameters, such as the effect of addition of CTAB aqueous phase, the quantity of TBP, the concentration of NaCl were studied. The results demonstrate that the addition of CTAB in aqueous phase can enhance the gold (I) extraction rate of TBP sharply. Though it has little effect on the gold (I) extraction percentage, the concentration of NaCl and the quantity of TBP can reduce the degree of emulsification. The extraction of 50 L alkaline cyanide solutions in three extraction columns shows that the extraction percentage is more than 95%, and the gold mass concentration of raffinate is less than 0.5×10-6 in the all extraction process. Gold (I) stripping from gold loaded organic phase by KSCN was also studied. About 93% gold (I) in organic phase could be stripped into aqueous phase when the concentration of KSCN reached 3 mol/L.
Key words: extraction column; KAu(CN)2; cetyltrimethylammonium bromide; tributyl phosphate; KSCN
