Solvent extraction of rare earth ions from nitrate media with new extractant di-（2,3-dimethylbutyl）-phosphinic acid
来源期刊：Journal of Rare Earths2016年第7期
论文作者：王俊莲 陈广 徐盛明 尹祉力 张覃
文章页码：724 - 730
摘 要：As a relatively new extractant, di-（2,3-dimethylbutyl）-phosphinic acid（HYY-2） is more efficient to separate heavy rare earths Tm/Yb/Lu than Cyanex 272 and P507. In this paper, HYY-2 was synthesized in our lab, and the extraction equilibrium, thermodynamics and stripping acidity for La, Gd and Y, which stood for light rare earth elements（REE）, middle REE and heavy REE respectively, from nitrate media with this extractant were investigated. Meanwhile, extraction ability, capacity and stripping acidity of HYY-2 were investigated and compared with those of Cyanex 272 and P507. The separation performance for rare earth element couples Gd/Eu and Er/Y were also studied. Compared to Cyanex 272, it possessed higher extraction capacity; while compared with P507, it has lower stripping acidity. The maximum βGd/Eu 1.46 occurred at pH equilibrium=2.78 and the maximum βEr/Y was 1.47 when pHequilibrium= 2.01.
王俊莲1,2，陈广2,3，徐盛明2，尹祉力2,4，张覃3
1. Civil and Environmental Engineering School, University of Science and Technology Beijing2. Institute of Nuclear and New Energy Technology, Tsinghua University3. Mining College, Guizhou University4. College of Chemistry and Chemical Engineering, Shihezi University
摘 要：As a relatively new extractant, di-（2,3-dimethylbutyl）-phosphinic acid（HYY-2） is more efficient to separate heavy rare earths Tm/Yb/Lu than Cyanex 272 and P507. In this paper, HYY-2 was synthesized in our lab, and the extraction equilibrium, thermodynamics and stripping acidity for La, Gd and Y, which stood for light rare earth elements（REE）, middle REE and heavy REE respectively, from nitrate media with this extractant were investigated. Meanwhile, extraction ability, capacity and stripping acidity of HYY-2 were investigated and compared with those of Cyanex 272 and P507. The separation performance for rare earth element couples Gd/Eu and Er/Y were also studied. Compared to Cyanex 272, it possessed higher extraction capacity; while compared with P507, it has lower stripping acidity. The maximum βGd/Eu 1.46 occurred at pH equilibrium=2.78 and the maximum βEr/Y was 1.47 when pHequilibrium= 2.01.
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