摘要
The extraction and stripping characteristics of Versatic 10 and its mixtures with Cyanex 301 were investigated for the recovery of cobalt and nickel from sulfate solutions containing magnesium and calcium. The optimum extraction factors of Versatic 10 were initial pH of 2.5, O/A ratio of 1/3, and saponification rate of 60%. The loaded Versatic 10 was stripped by using 2 mol/L H2SO4 at O/A ratio of 1/1. The optimum volume ratio of Versatic 10 to Cyanex301 was 7/3 in the mixtures, which could effectively reduce the equilibrium pH to 3.50. And the loaded mixtures were stripped by using 2 mol/L H2SO4at O/A ratio of 1/2. The reaction principle of Versatic10 and metal ions is an ion exchange reaction. However, in the extraction reaction of and metal ions, besides the ion exchange reaction, the strong coordination effect between Cyanex 301 and metal ions also exists, which is much weakened in the extraction reaction of the mixtures and metal ions.
考察萃取剂Versatic 10以及它和Cyanex 301组成的复配萃取体系从含有镁钙离子的硫酸盐溶液中萃取分离镍钴离子的萃取和反萃特征。Versatic 10萃取分离镍钴和钙镁的最佳条件为初始pH值为2.5、油水体积比O/A为1/3、皂化率为60%。Versatic 10的负载有机相用2 mol/L的硫酸溶液以O/A为1/1进行反萃。复配萃取体系中Versatic 10和Cyanex 301的最佳体积比为7/3,复配体系能有效降低镍钴和钙镁萃取分离的平衡pH值至3.50,当O/A为1/2时,2 mol/L的硫酸溶液可以对负载有机相进行有效反萃。Versatic 10与金属离子进行萃取的反应机理为离子交换,而Cyanex 301与金属离子之间不仅有离子交换还有强烈的配位效应,这种配位效应在复配体系与金属离子萃取过程中被大大削弱。
基金
Project(2012BAB07B05)supported by the National Key Technology R&D Programs from the Ministry of Science and Technology of China
Project(B14034)supported by the Program of Introducing Talents of Discipline to Universities,China
