Selective Extraction of Y from a Ho/Y/Er Mixture by Liquid−Liquid Extraction in the Presence of a Water-Soluble Complexing Agent
Selective Extraction of Y from a Ho/Y/Er Mixture by Liquid−Liquid Extraction in the Presence of a Water-Soluble Complexing Agent
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DOI：
10.1021/ie000030a
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发表时间：
2000-09
影响因子：
4.2
通讯作者：
S. Nishihama;T. Hirai;I. Komasawa
中科院分区：
文献类型：
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作者：
S. Nishihama;T. Hirai;I. Komasawa
研究了在水溶性络合剂乙二胺四乙酸（EDTA）存在下，用2-乙基己基膦酸单（2-乙基己基）酯（EHPNA）从Ho/Y/Er溶液中选择性萃取钇的方法。在EDTA存在下，Ho，Y和Er的三元体系的萃取行为可以使用萃取平衡公式表示，适用于EDTA自由体系，并且与稀土金属与EDTA络合时不参与萃取（掩蔽效应）的假设一致。由于掩蔽效应，与Y相比，在EDTA存在下Ho和Er的萃取被抑制，并且Y的选择性萃取被增强。通过使用逆流混合器-沉降器级联从Ho/Y/Er混合物中分离Y的模拟研究表明，在萃取和洗涤段中加入EDTA可增强分离。
The selective extraction of Y from Ho/Y/Er solution by liquid−liquid extraction using (2-ethylhexyl)phosphonic acid mono(2-ethylhexyl) ester (EHPNA), in the presence of a water-soluble complexing agent (ethylenediaminetetraacetic acid, EDTA), has been investigated. The extraction behavior of the ternary system for Ho, Y, and Er, in the presence of EDTA can be expressed using extraction equilibrium formulations, applying for the EDTA free system and consistent with the assumption that the rare-earth metals, when complexed with EDTA, do not take part in the extraction (masking effect). The extraction of Ho and Er in the presence of EDTA is suppressed when compared to that of Y because of the masking effect, and the selective extraction of Y is enhanced. Simulation studies for the separation of Y from a Ho/Y/Er mixture, by the use of a countercurrent mixer−settler cascade, show that the separation is enhanced by the addition of EDTA in both extraction and scrubbing sections.