Synergistic extraction of rare earth by mixtures of 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester and di-(2-ethylhexyl) phosphoric acid from sulfuric acid medium

被引：0
|
作者：
黄小卫 [1 ]
李建宁 [2 ]
龙志奇 [2 ]
张永奇 [2 ]
薛向欣 [1 ]
朱兆武 [2 ]
机构：
[1] Institute of Metallurgical Resources & Environmental Engineering, Northeastern University
[2] National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals, and GRIREM Advanced Material Co. Ltd.
来源：
Journal of Rare Earths | 2008年 / 03期
基金：
中国国家自然科学基金;
关键词：
di-(2-ethylhexyl) phosphoric acid; 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester; synergistic extraction; mechanism; Sm3+; Nd3+; rare earths;
D O I：
暂无
中图分类号：
TG146.45 [];
学科分类号：
080502 ;
摘要：
The extraction of Nd3+ and Sm3+, including the extraction and stripping capability as well as the separation effect of Nd3+ or Sm3+, from a sulfuric acid medium, by mixtures of di-(2-ethylhexyl) phosphoric acid (HDEHP, H2A2(0)) and 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (HEH/EHP, H2L2(0)) were studied. The distribution ratios and synergistic coefficients of Nd3+ and Sm3+ in different acidities were also determined. A synergistic extractive effect was found when HDEHP and HEH/EHP were used as mixed extractants for Sm3+ or Nd3+. The chemical compositions of the extracted complex were determined as Nd·(HA2)2·HL2 and Sm·(HA2)2·HL2. The extraction equilibrium constants, enthalpy change, and entropy change of the extraction reaction were also determined.
引用
收藏
页码：410 / 413
页数：4
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