Mechanism of gold solvent extraction from aurocyanide solution by quaternary amines: models of extracting species based on hydrogen bonding

The mechanism of gold solvent extraction from KAu(CN)2 solution was investigated by means of FTIR, EXAFS, ICP and radioactive tracer methods. Two extraction systems were studied, namely N263-tributyl phosphate(TBP)-n-dodecane and N263-iso-octanol-n-dodecane. High-resolution FT IR spectroscopy indica...

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Published inScience China. Chemistry Vol. 43; no. 2; pp. 169 - 177
Main Authors Ma, Gang, Yan, Wenfei, Chen, Jing, Yan, Chunhua, Gao, Hongcheng, Zhou, Weijin, Shi, Nai, Wu, Jinguang, Xu, Guangxian, Huang, Kun, Yu, Jianmin, Cui, Ning
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 01.04.2000
State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China%Institute of Precious Metals, Kunming 650221, China
Subjects
Amines
Dodecane
Gold
Hydrogen bonding
Hydrogen bonds
Infrared spectroscopy
Octanol
Quaternary ammonium salts
Radioactive tracers
Solvent extraction
Stretching
gold
hydrogen bonding
FT IR
extraction
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Summary:The mechanism of gold solvent extraction from KAu(CN)2 solution was investigated by means of FTIR, EXAFS, ICP and radioactive tracer methods. Two extraction systems were studied, namely N263-tributyl phosphate(TBP)-n-dodecane and N263-iso-octanol-n-dodecane. High-resolution FT IR spectroscopy indicated that the CN stretching vibrations of the two extraction systems differred greatly. In order to interpret the significant difference in CN stretching vibrations, two extracting species models are proposed—supramolecular structures based on the formation of hydrogen bonds between Au(CN)2- and modifiers such as TBP and iso-octanol.
ISSN:1006-9291
1674-7291
1862-2771
1869-1870
DOI:10.1007/BF03027307