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化工学报  2014 

P507硝酸体系萃取铒及其与钙、铁的分离

DOI: 10.3969/j.issn.0438-1157.2014.01.033, PP. 258-263

Keywords: 稀土,P507,皂化,萃取,分离,平衡

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Abstract:

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。

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