| 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 |
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| 引用本文： | 黄小卫,李建宁,龙志奇,张永奇,薛向欣,朱兆武.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[J].中国稀土学报(英文版),2008,26(3):410-413. |
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| 作者姓名： | 黄小卫 李建宁 龙志奇 张永奇 薛向欣 朱兆武 |
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| 作者单位： | [1]Institute of Metallurgical Resources ＆ Environmental Engineering, Northeastern University; Shenyang 110004, China [2]National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and GRIREM Advanced Material Co. Ltd., Beifing 100088, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （50674016） and the National High Technology Research and Development Program of China （863 Program） （2006AA06Z123） |
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| 摘 要： | The extraction of Nd^3＋ and Sm^3＋, including the extraction and stripping capability as well as the separation effect of Nd^3＋ or Sm^3＋, 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 Nd^3＋ and Sm^3＋ in different acidities were also determined. A synergistic extractive effect was found when HDEHP and HEH/EHP were used as mixed extractants for Sm^3＋ or Nd^3＋. 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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| 关 键 词： | 磷酸 混合物 稀土 实验研究 |
| 收稿时间： | 25 November 2007 |
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 |
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| Xiaowei HUANG, Jianning LI, Zhiqi LONG, Yongqi ZHANG, Xiangxin XUE,Zhaowu ZHU.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[J].Journal of Rare Earths,2008,26(3):410-413. |
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| Authors: | Xiaowei HUANG Jianning LI Zhiqi LONG Yongqi ZHANG Xiangxin XUE Zhaowu ZHU |
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| Affiliation: | aInstitute of Metallurgical Resources & Environmental Engineering, Northeastern University; Shenyang 110004, China;bNational Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and GRIREM Advanced Material Co. Ltd., Beijing 100088, China |
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| Abstract: | 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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| Keywords: | di-(2-ethylhexyl) phosphoric acid 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester synergistic extraction mechanism Sm3+ Nd3+ rare earths |
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