Mechanism of Gold Extraction from Cyanide Solution by Tetradecyldimethylbenzylammonium Chloride

Abstract

Abstract: The mechanism of solvent extraction of gold from cyanide solution by quaternary ammonium salt, tetradecyldimethylbenzylammonium chloride(TDMBAC)/tri-n-butyl phosphate(TBP)/heptane was studied. The microstructure of complexes,[R₄N⁺]·[Au(CN)₂^-]·4H₂O·4TBP, in the organic phase was proposed based on hydrogen-bonding mechanism. Aggregations formed when gold (Ⅰ) mass concentration in the organic phase reached 3 g·L^-1. The radii of aggregations were determined by dynamic laser scattering(DLS). During the extraction process, the complexes of TDMBAC and Au(CN)₂^- formed micelles in the aqueous phase. When cosolvent such as TBP was added to the aqueous phase, the complexes transferred into the organic phase and reversed micelles or microemulsion (W/O) were formed.

Key words: Microemulsion, Au(CN)₂^-, FTIR, Tetradecyldimethylbenzylammonium chloride, Reversed micelle

CLC Number:

O614

TrendMD:

JIANG Jian-Zhun, ZHOU Wei-Jin, GAO Hong-Cheng, WU Jin-Guang, XU Guang-Xian . Mechanism of Gold Extraction from Cyanide Solution by Tetradecyldimethylbenzylammonium Chloride[J]. Chem. J. Chinese Universities, 2002, 23(12): 2230.

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Mechanism of Gold Extraction from Cyanide Solution by Tetradecyldimethylbenzylammonium Chloride

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