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：
JournalofRareEarths | 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：
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.
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页码：410 / 413
页数：4
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