Selective extraction of Y from a Ho/Y/Er mixture by liquid-liquid extraction in the presence of a water soluble complexing agent

被引：49

作者：

Nishihama, S ^{[1
]}

Hirai, T ^{[1
]}

Komasawa, I ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Dept Sci & Chem Engn, Toyonaka, Osaka 5608531, Japan

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2000年 / 39卷 / 10期

关键词：

D O I：

10.1021/ie000030a

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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.

引用

页码：3907 / 3911

页数：5

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