酸性萃取剂负载Cr(Ⅲ)的碱反萃取研究

来源期刊：有色金属科学与工程2011年第4期

论文作者：范进军 邓声华 谢芳浩 杨幼明

文章页码：97 - 100

关键词：Cr(Ⅲ)；P204；P507；碱；反萃取

Key words：Cr(Ⅲ); P204; P507; alkali; back-extraction

摘    要：

针对酸性萃取剂负载的Cr(Ⅲ)高酸难反萃、反萃不完全的问题，根据不同酸度条件下Cr(Ⅲ)与OH^-络合形态的差别，进行了碱作为反萃取剂从负载Cr(Ⅲ)的酸性萃取剂中回收铬实验研究.结果表明，碱反萃取P204负载有机相时的优化条件为0.5 mol/L氢氧化钠、相比为1、常温、反萃取反应为10 min，经四级逆流反萃取，反萃取率达到98.3%；碱反萃取P507负载有机相时的优化条件为2 mol/L氢氧化钠、相比为1、常温、反萃取反应为20 min，经四级逆流反萃取，反萃取率达到98.8%.

Abstract:

Back-extraction of chromium from acidic extractant is difficult, whose recovery is generally low. This paper studies the back-extraction of Cr(Ⅲ) in acidic extractant by alkali based on the different complexing speciation of Cr(Ⅲ) and OH in various acidic solution. The optimized conditions for P204 and P507 extractants are as follows: O/A is l, sodium hydroxide concentrations are 0.5 mol/L and 2 mol/L, separately; back-extraction times are 10 and 20 min, and the recoveries reach 98.3% and 98.8% after 4 steps back-extraction at room temperature.