Studies on the Extraction of Gold Using a-Alkyl Substituted Pyridines(Ⅰ)——Determination of the lonization Constant of α-Alkyl Substituted Pyridines and the Extraction Behaviour of Gold

Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (5): 593.

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Studies on the Extraction of Gold Using a-Alkyl Substituted Pyridines(Ⅰ)——Determination of the lonization Constant of α-Alkyl Substituted Pyridines and the Extraction Behaviour of Gold

GAN Wei-Tang, ZHANG Yu-Fan, DONG Li-Jun, WANG Zhong-Guo, NIE Zhi-Qin, LIANG Shu-Sen

Department of Chemistry, Nankai University, Tianjin, 300071

Received:1992-02-19 Revised:1993-01-04 Online:1993-05-24 Published:1993-05-24

Abstract

Abstract: The behaviour of nine kinds of a-alkyl substituted pyridines (Ⅰ) in the extraction of gold in hydrochloric acid media has been investigated.The ionization constants of (Ⅰ) were determined.The effect of the.basicity and steric hindrance in (Ⅰ) on the extraction of gold is also discussed.The experimental results indicate that the order of the extractability of (Ⅰ) is HpPY≈i-HPY>HPY> i-PPY>BePY>PPY>BzPY>BpPY>TfPY.The extracted species are found to be 1:2(Au/I) complex in benzene solution.The extraction mechanism and the influences of the diluent, temperature, common metal ions and various anions on the extraction of Au (Ⅲ) are also studied.

Key words: a-Alkyl substituted pyridines, Gold, Solvent extraction

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GAN Wei-Tang, ZHANG Yu-Fan, DONG Li-Jun, WANG Zhong-Guo, NIE Zhi-Qin, LIANG Shu-Sen . Studies on the Extraction of Gold Using a-Alkyl Substituted Pyridines(Ⅰ)——Determination of the lonization Constant of α-Alkyl Substituted Pyridines and the Extraction Behaviour of Gold[J]. Chem. J. Chinese Universities, 1993, 14(5): 593.

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Studies on the Extraction of Gold Using a-Alkyl Substituted Pyridines(Ⅰ)——Determination of the lonization Constant of α-Alkyl Substituted Pyridines and the Extraction Behaviour of Gold

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