盐酸胍与溴化十六烷基吡啶从碱性氰化液中萃取Au(I)

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0.06 mol/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0.01 mol/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12 g/L、反萃时间30 min、相比A/O=1时，Au(I)的反萃率为98.5%.

Extraction of Au(I) from Alkaline Cyanide Solution with Guanidine Hydrochloride-Hexadecylpyridine Bromide

The effects of concentrations of guanidine hydrochloride (GCl) and hexadecylpyridine bromide (RBr) served as extracting reagents on the performance of Au(I) extraction from cyanide solution were investigated when n-pentanol acted as diluting reagent. The synergic extraction effects of Au(I) were examined with GCl 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 GCl-RBr (synergic extraction coefficient R>1), and when GCl and RBr concentrations are 0.05 and 0.01 mol/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 GCl and RBr was analysed. Au(I) was stripped respectively by Na2SO3 solution and KSCN solution, and KSCN was more excellent than Na2SO3 on stripping of Au(I). The stripping rate of Au(I) was 98.5% when KSCN concentration was 12 g/L and stripping time 30 min and phase ratio A/O 1.