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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 1    February 2005

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Microscopic mechanism in solvent extraction of 
Au(CN)-2 by cationic surfactant
CHEN Jing(陈 景)1, HUANG Kun(黄 昆)1, YU Jian-min(余建民)1,
WU Jin-guang(吴瑾光)2,  SHI Nai(施 鼐)2, XU Guang-xian(徐光宪)2

1. Institute of Precious Metals, Kunming 650221, China;
2. College of Chemistry and Molecular Engineering, Peking University,
Beijing 100871, China

Abstract:A new solvent extraction system of Au(Ⅰ) by surfactant CTMAB-TBP-inert diluent-Au(CN)-2-H2O was investigated and established. The infrared spectra and the conductivities of loaded organic phases containing Au(Ⅰ) were recorded stage by stage. It was reported that in the presence of salting-out agents the pencent extraction of Au(Ⅰ) decreased, and the conversion of emulsions from W/O to O/W happened in the extraction processed. The results demonstrate that the extraction process of Au(CN)-2  is carried out by two steps. First, an associated molecule between CTMA+  and TBP, as (C16H33)(CH3)3N+•H2O•O═P(OC4H9)3, is formed by dint of water molecule, then it will pull Au(CN)-2  into the organic phase based on the electro-neutrality.

 

Key words: surfactant; solvent extraction; Au(CN)-2

ISSN 1672-7029
CN 43-1423/U

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