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：47

作者：

Huang Xiaowei ^{[1
,2
,3
]}

Li Jianning ^{[2
,3
]}

Long Zhiqi ^{[2
,3
]}

Zhang Yongqi ^{[2
,3
]}

Xue Xiangxin ^{[1
]}

Zhu Zhaowu ^{[2
,3
]}

机构：

[1] Northeastern Univ, Inst Met Resources & Environm Engn, Shenyang 110004, Peoples R China

[2] Gen Res Inst NonFerrous Met, Natl Engn Res Ctr Rare Earth Mat, Beijing 100088, Peoples R China

[3] GRIREM Adv Mat Co Ltd, Beijing 100088, Peoples R China

来源：

JOURNAL OF RARE EARTHS | 2008年 / 26卷 / 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：

10.1016/S1002-0721(08)60107-6

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

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, H(2)A(2(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 center dot(HA(2))(2)center dot HL2 and Sm center dot(HA(2))(2)center dot HL2. The extraction equilibrium constants, enthalpy change, and entropy change of the extraction reaction were also determined.

引用

页码：410 / 413

页数：4

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