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

NIU Qinglin; WANG Yundong

doi:10.3969/j.issn.0438-1157.2014.01.033

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

更新时间：2025-12-10

- Solvent extraction of erbium(Ⅲ) with P507 in nitric acid solution and its separation from calcium(Ⅱ) and ferrum(Ⅲ)
- CIESC Journal Issue 1, Pages: 258-263(2014)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.01.033
  CLC： F845+.3
- Online First：05 January 2014，
  
  Published：05 January 2014
- 稿件说明：
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NIU Qinglin, WANG Yundong. Solvent extraction of erbium(Ⅲ) with P507 in nitric acid solution and its separation from calcium(Ⅱ) and ferrum(Ⅲ)[J]. CIESC Journal, 2014, (1): 258-263.
DOI：

NIU Qinglin, WANG Yundong. Solvent extraction of erbium(Ⅲ) with P507 in nitric acid solution and its separation from calcium(Ⅱ) and ferrum(Ⅲ)[J]. CIESC Journal, 2014, (1): 258-263. DOI： 10.3969/j.issn.0438-1157.2014.01.033.

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。

Abstract

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 Er3+. 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 Er3+ at the present concentration range. Separation factor of βEr3+/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 βEr3+/ Fe3+ was higher than 10 which showed a good separation of Fe3+ from Er3+.

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