添加表面活性剂后,碱性氰化液中的金被高效萃取,水分子在萃合物结构中提供氢键.以十六烷基三甲基溴化铵(CTAB)为表面活性剂,磷酸三丁酯(TBP)为萃取剂的体系具有很好的萃金效率,用198Au示踪活化、微库仑水分测定(卡尔-费怰法)和红外光谱法对该体系进行了分析,并用线性拟合的方式研究有机相中水和金的定量关系.结果表明,萃合物中水浓度与金浓度线性相关,摩尔比约为4;红外光谱分析结果显示,有机相中的金、氰根和水的含量有固定比例,萃合物具有稳定的化学组成.
With the addition of a certain surfactant, gold in alkaline cyanide solution can be effectively extracted. Water molecules play an important role as hydrogen bond donors in extracted species. The extracting system consisting of cetyltrimethyl ammonium bromide (CTAB) as the surfactant and of tributyl phosphate (TBP) as the extraction agent has high extraction efficiency.198Au isotope labelled tracer, micro-coulometric water titration (Karl Fischer) and IR spectroscopy were used to analyzing extractng, process while the linear fitting method to calculate the quantitative relationship between gold and water in the organic phase. The results showed a linear correlation between the concentrations of water and gold in extracted species, and the mole ratio was about 4. IR spectra indicated that the content ratio of gold to cyanide to water is fixed, and the extracted species had a stable chemical composition.
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