Acta Scientiarum Naturalium Universitatis Pekinensis

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Gold Stripping from Loaded Organic Phase in Quaternary Amine System by Glycol and Diglylenethioether

JIANG Jianzhun1,ZHOU Weijin1,GAO Hongcheng1,WU Jinguang2,XU Guangxian2,CHEN Jing3   

  1. 1Technical Physics Department, Peking University, Beijing, 100871;2College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871;3Precious Metal Institute, Kunming, 650031
  • Received:2000-07-07 Online:2001-07-20 Published:2001-07-20



  1. 1北京大学技术物理系,北京,100871;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,650031

Abstract: Gold(Ⅰ) Stripping from loaded organic phase in quaternary ammonium(TDMBAC) system with glycol and diglylenethioether were studied by 198Au tracer method. The influence of several variables such as stripping agent concentrations, the volume ratio of gold loaded organic phase and stripping agents, ethanol concentrations on the gold(Ⅰ) stripping, and the continuous extraction and stripping were studied under 25℃. It is found that both GLY and DGTE are excellent stripping agents. While the volume percentage of GLY is more than 90% or that of DGTE is more than 70%, the stripping percentage is higher than 90%. Moderate ethanol can enhance the stripping of gold(Ⅰ) in both systems but organic phase especially TBP can be solubilized into aqueous phase as the concentration of ethanol is too high. The organic phase can be reused if stripping agents do not contain ethanol. It is also found that both NaClO4and NH4SCN are excellent stripping agents.

Key words: gold, diglylenethioether, glycol, stripping, 198Au tracer method

摘要: 用放射性同位素198Au示踪法研究了乙二醇(GLY)、二羟乙基硫醚(DGTE)等对季铵盐载金有机相的反萃,考察了反萃剂的浓度、有机相与反萃剂的体积比(R)、加入乙醇等对反萃率(S)的影响。讨论了有机相反萃后继续萃取的问题。结果表明,GLY, DGTE在较高体积分数时都是很好的反萃剂。当GLY体积分数大于90%、DGTE体积分数大于70%时,其反萃能力均可达到90%。反萃剂中不含乙醇时,反萃后有机相具备连续萃取能力。实验还发现,NaClO4和NH4SCN也有很好的反萃作用。

关键词: 金, 二羟乙基硫醚, 乙二醇, 反萃取, 198Au同位素示踪法

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