摘要
以正戊醇为稀释剂,考察了盐酸胍与溴化十六烷基吡啶总浓度为0.06mol/L时,体系对Au(I)的协萃效应.结果表明,在整个浓度组成范围内均有协萃效应(协萃效应系数R>1),且有机相中盐酸胍与溴化十六烷基吡啶的浓度分别为0.05和0.01mol/L时,Au(I)的协萃系数为13.98.考察了平衡时间、相比、待萃液pH值及Au(I)浓度对Au(I)协同萃取性能的影响.对盐酸胍与溴化十六烷基吡啶萃取Au(I)的可能机理进行了分析.分别用Na2SO3和KSCN为反萃剂反萃Au(I),KSCN的反萃性能明显比Na2SO3好,KSCN浓度为12g/L、反萃时间30min、相比A/O=1时,Au(I)的反萃率为98.5%.
The effects of concentrations of guanidine hydrochloride （GC1） and hexadecylpyridine bromide （RBr） served as extracting reagents on the performance of Au（I） extraction fxom cyanide solution were investigated when n-pentanol acted as diluting reagent. The synergic extraction effects of Au（I） were examined with GC1 and RBr at the total concentration of 0.06 mol/L. The results show that synergic extraction effects are obvious within the whole concentration composition range of GC1-RBr （synergic extraction coefficient R〉I）, and when GC1 and RBr concentrations are 0.05 and 0.01 tool/L, the synergic extracting coefficient is 13.98. The effects of equilibrium time, phase ratio O/A, pH value and Au（I） concentration in the aqueous phase on the extraction rate of Au（I） were investigated by the synergic extraction system. The possible extraction mechanism of Au（I） with GC1 and RBr was analysed. Au（I） was stripped respectively by NaESO3 solution and KSCN solution, and KSCN was more excellent than NaESO3 on stripping of Au（I）. The stripping rate of Au（I） was 98.5% when KSCN concentration was 12 girl and stripping time 30 rnin and phase ratio A/O 1.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2008年第4期741-745,共5页
The Chinese Journal of Process Engineering
基金
安徽省高等学校青年教师科研基金资助项目(编号:2005jql137)
关键词
盐酸胍
溴化十六烷基吡啶
碱性氰化液
萃取
Au(I)
guanidine hydrochloride
hexadecylpyridine bromide
alkaline cyanide solution
extraction
Au（I）
