| Investigation on the Extraction Mechanism of Au（I） from Cyanide Solution with Quaternary Ammonium System |
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| 作者姓名： | Jian Zhun JIANG Wei Hong LI Wei Jin ZHOU Hong Cheng GAO* Jin Guang WU Guang Xian XU |
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| 作者单位： | Jian Zhun JIANG，Wei Hong LI，Wei Jin ZHOU，Hong Cheng GAO*，Jin Guang WU，Guang Xian XU Department of Applied Chemistry，College of Chemistry and Molecular Engineering，Peking University，Beijing 100871 |
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| 基金项目： | the National Natural Science Foundation of China (No.20023005 ) for financial support. |
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| 摘 要： | During the past decades, there has been a renewed interest in the application of solvent extraction to the recovery of Au (I) from cyanide solutions1,2. Among those various extractants, the amine extractants with the addition of organic phosphorus oxide as cosolvent have been widely investigated3,4. Various diluents and modifiers have been selected to optimize the extraction system so as to increase the loading capacity, improve the selectivity and/or reduce emulsification5. Quaternary amm…
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| 关 键 词： | Au（I） 金 提取装置 氰化物溶液 萃取 |
Investigation on the Extraction Mechanism of Au (I) from Cyanide Solution with Quaternary Ammonium System |
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| Jian Zhun JIANG,Wei Hong LI,Wei Jin ZHOU,Hong Cheng GAO*,Jin Guang WU,Guang Xian XU.Investigation on the Extraction Mechanism of Au (I) from Cyanide Solution with Quaternary Ammonium System[J].Chinese Chemical Letters,2003,14(4):397-400. |
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| Authors: | Jian Zhun JIANG Wei Hong LI Wei Jin ZHOU Hong Cheng GAO Jin Guang WU Guang Xian XU |
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| Abstract: | The mechanism of Au (I) extraction has been characterized using 198Au radiometry, thermodynamic equilibrium, Karl-Fischer titration and FT-IR spectroscopy techniques. The results indicate that the extraction follows ionic combination and solvent interaction mechanism. The stoichiometry of the extracted species is 1:1:4:4 for TDMBA+: Au(CN)2- : TBP : H2O. The microstructure model of the extracted complex is a supramolecular structure via hydrogen bonding, ion dipole interaction and ionic combination. The extraction process can be described as micelles in the aqueous phase transfer into the organic phase and reversed micelles or microemulsion (W/O) form in the organic phase. |
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| Keywords: | Solvent extraction Au(CN)_2~- FT-IR tetradecyldimethylbenzylammonium chloride (TDMBAC) |
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