| Solvent extraction of La（III） with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester （EHEHPA） by membrane dispersion micro-extractor |
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| 引用本文： | 侯海龙,王运东,徐建鸿,陈晋南.Solvent extraction of La（III） with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester （EHEHPA） by membrane dispersion micro-extractor[J].中国稀土学报(英文版),2013,31(11):1114-1118. |
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| 作者姓名： | 侯海龙 王运东 徐建鸿 陈晋南 |
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| 作者单位： | [1]School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China [2]State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| 基金项目： | Project supported by National Basic Research Program of China （2012CBA01203） and the National Natural Science Foundation of China （90210034, 20221603） |
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| 摘 要： | The conventional rare earth solvent extraction equipments have many problems such as long mixing time, low processing capacity, large factory area occupation, high energy consumption and so on. In order to solve the problems, many types of equipments were brought out. In this work, studies were carried out on the La（III） extraction process with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester （EHEHPA） by membrane dispersion micro-extractor. Equilibrium studies showed that the initial aqueous pH value 4.15 with the saponification rate 40%was the optimal operation condition. The effects of membrane dispersion micro-extractor operational conditions such as dispersion mode, bulk flow rate and organic phase flow rate on the extraction efficiency were studied. The results showed that when the organic solution was the dispersed phase, the extraction efficiency was higher than that of others. Increasing bulk flow ratio could enhance the extraction efficiency greatly. When the ratio of organic phase flow rate to that of aque-ous phase was 80：80, the extraction efficiency was over 95%. The effect of stripping phase acidity on the La（III） recovery was studied. The results showed that when the stripping phase pH was 2.0, organic phase flow rate to stripping phase flow rate was 20：80;the re-covery efficiency of La（III） can reach 82%.
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| 关 键 词： | EHEHPA 乙基己基磷酸 溶剂萃取 乙基己酯 膜分散 La（Ⅲ） 最佳操作条件 提取效率 |
| 收稿时间： | 10 May 2013 |
Solvent extraction of La（III） with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester （EHEHPA） by membrane dispersion micro-extractor |
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| HOU Hailong,WANG Yundong,XU Jianhong,CHEN Jinnan.Solvent extraction of La（III） with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester （EHEHPA） by membrane dispersion micro-extractor[J].Journal of Rare Earths,2013,31(11):1114-1118. |
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| Authors: | HOU Hailong WANG Yundong XU Jianhong CHEN Jinnan |
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| Affiliation: | 1. School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China; 2. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China) |
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| Abstract: | The conventional rare earth solvent extraction equipments have many problems such as long mixing time, low processing capacity, large factory area occupation, high energy consumption and so on. In order to solve the problems, many types of equipments were brought out. In this work, studies were carried out on the La(III) extraction process with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (EHEHPA) by membrane dispersion micro-extractor. Equilibrium studies showed that the initial aqueous pH value 4.15 with the saponification rate 40% was the optimal operation condition. The effects of membrane dispersion micro-extractor operational conditions such as dispersion mode, bulk flow rate and organic phase flow rate on the extraction efficiency were studied. The results showed that when the organic solution was the dispersed phase, the extraction efficiency was higher than that of others. Increasing bulk flow ratio could enhance the extraction efficiency greatly. When the ratio of organic phase flow rate to that of aqueous phase was 80:80, the extraction efficiency was over 95%. The effect of stripping phase acidity on the La(III) recovery was studied. The results showed that when the stripping phase pH was 2.0, organic phase flow rate to stripping phase flow rate was 20:80; the recovery efficiency of La(III) can reach 82%. |
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| Keywords: | lanthanum（Ill） membrane dispersion micro-extractor bulk flow rate stripping acidity rare earths |
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