P507硝酸体系萃取铒及其与钙、铁的分离  

Solvent extraction of erbium(Ⅲ) with P507 in nitric acid solution and its separation from calcium(Ⅱ) and ferrum(Ⅲ)

作　　者：牛卿霖 王运东[1] 

机构地区：[1]清华大学化学工程系,化学工程联合国家重点实验室,北京100084

出　　处：《化工学报》2014年第1期258-263,共6页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2012CBA01203)~~

摘　　要：稀土分离过程中常常需要进行稀土与非稀土元素的分离。在硝酸体系中进行了无皂化和皂化P507萃取分离Er3+的实验研究。通过作图法确定了无皂化P507萃取Er3+的反应式。皂化实验研究发现增加皂化度能够提高Er3+的萃取效果,但是皂化度过高会导致反应时水相容易水解而降低萃取率。Er3+的萃取率随着初始水相pH的增加而先增加后降低,在初始水相pH为2.0时达到最大值(>95%)。杂质(Ca2+、Fe3+)的存在对于Er3+的萃取率没有影响,铒与钙的分离因子βEr3+/Ca2+一般都能达到10以上,两者分离效果较好。但是只有在初始水相pH为3.0左右时,铒与铁的分离因子βEr3+/Fe3+较高(>10)从而两者能有较好的分离效果。It is a common practice in rare earth element separation for separating rare earth metals with non-rare earth elements. In this paper, solvent extraction experiments of Er3＋ with P507 and saponified P507 in nitric acid solution and its separation from Ca2＋ and Fe3＋ were performed. The extraction reaction of Er3＋ with P507 was determined by graphical method. It was found that increasing saponification degree improved extractability of Era＋ But high degree of saponification led to the decrease of extractability due to Er3＋ hydrolysis in aqueous phase. The extractability of Er3＋ increased with the increase of initial pH in aqueous phase. When initial pH in aqueous phase was around 2.0, extractability of Er3＋ reached a maximum （〉95%）. The impurities （Ca2＋, Fe3＋） barely influenced the extractability of Era＋ at the present concentration range. Separation factor of flEr3＋/Ca2＋ was higher than 10, which indicated that Ca2＋ could be effectively removed from Er3＋. When initial pH in aqueous phase was around 3.0, separation factor of tiEr3＋/Fe3＋ was higher than 10 which showed a good separation of Fe3＋ from Era＋.

关 键 词：稀土 P507 皂化 萃取 分离 平衡 

分 类 号：TF845.3[冶金工程—有色金属冶金]