多烷基支链仲胺从碱性氰化液中萃取金

Extraction of gold from Alkaline Cyanide Solution by Alkyl-substituted Secondary Amine

研究了多烷基支链仲胺从碱性氰化液中萃取金 ,考察了平衡时间、水相初始 p H值、金浓度、离子强度、温度、萃取剂浓度、稀释剂、相比等因素对金萃取率的影响 ,绘制了萃取等温线 ,测定了金的饱和容量 ,考察了萃取体系对银 ( )、铁 ( )、铜 ( )、镍 ( )、锌 ( )的萃取性能 ,计算出了金与这些杂质元素的分离系数 ,研究了负载有机相中金的反萃 .结果表明 ,该萃取体系在 p H5～ 1 1范围内对 Au( CN) -2 有较高的萃取率和选择性 ,p H1/ 2 =1 1 .7,可用于碱性氰化液中金的萃取分离 .

The extraction of gold from alkaline cyanide solution by alkyl substituted secondary amine has been investigated. The effects of several variables, such as equilibrium time, temperature, diluent, extractant concentration, pH, gold concentration, ionic strength of the aqueous phase and phase ratio(O/A) on the extraction yield are discussed. The extraction isotherm, saturation capacity, separation coefficients of gold to silver(Ⅰ), ferrous(Ⅱ), copper(Ⅰ), nickel(Ⅱ), zinc(Ⅱ) have been determined respectively. Stripping extraction of gold from loaded organic phase has also been studied. The results showed that the system consisted of 0 1%(volume fraction) secondary amine(7203) 0 05%(volume fraction)ROH n dodecane gave high extraction yield and selectivity for Au(CN) - 2 at pH 1/2 =11 7.