| 修饰聚合物盐水液-固萃取体系分离钪(Ⅲ)和镨(Ⅲ)的研究 |
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| 引用本文： | 察冬梅,孙小梅,李步海,胡景.修饰聚合物盐水液-固萃取体系分离钪(Ⅲ)和镨(Ⅲ)的研究[J].稀有金属,2004,28(5):958-962. |
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| 作者姓名： | 察冬梅 孙小梅 李步海 胡景 |
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| 作者单位： | 中南民族大学化学与生命科学学院,湖北,武汉,430074 |
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| 摘 要： | 究了Sc和Pr在聚乙二醇 亚氨基二乙酸 (简称PEG IDA)混合Tween 80 盐 水液 固萃取体系中的分配行为 ,讨论了修饰物用量、萃取酸度、吐温用量及分相盐种类和浓度对其萃取率的影响 ,筛选出最佳萃取分离条件 ,控制萃取酸度 ,实现了Sc和Pr的分离。并用pH电位法在 3 0℃的 0 .1mol·L- 1 KNO3溶液中测定了PEG IDA的离解常数以及PEG IDA与Sc和Pr形成的配合物的稳定常数 ,研究了稳定常数与稀土在PEG IDA修饰聚合物 盐 水液 固亲和萃取体系中分配行为的关系 ,并据此对该体系富集分离稀土的机制进行了初步探讨。结果表明 :Sc和Pr是通过与PEG IDA形成配合物而被萃入固相的。
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| 关 键 词： | 分离 聚合物盐-水液-固萃取体系 pH电位法 稳定常数 钪 镨 |
| 文章编号： | 0258-7076(2004)05-0958-05 |
Separation of Scandium (Ⅲ) and Praseodymium (Ⅲ) by Liquid-Solid Extraction System Based on Mixed Polymers of PEG-IDA and Tween 80 |
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| Cha Dongmei ,Sun Xiaomei,Li Buhai,Hu Jing.Separation of Scandium (Ⅲ) and Praseodymium (Ⅲ) by Liquid-Solid Extraction System Based on Mixed Polymers of PEG-IDA and Tween 80[J].Chinese Journal of Rare Metals,2004,28(5):958-962. |
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| Authors: | Cha Dongmei Sun Xiaomei Li Buhai Hu Jing |
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| Affiliation: | Cha Dongmei *,Sun Xiaomei,Li Buhai,Hu Jing |
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| Abstract: | The distribution behaviors of Sc and Pr in the system were investigated. The effects of the concentration of PEG-IDA, Tween 80, (NH 4) 2SO 4 and phosphate and extraction acidity on the extraction of Sc and Pr were discussed. The separations of Sc and Pr were carried out by controlling the extraction acidity. And the dissociation constant of PEG-IDA as well as the stability constant of PEG-IDA-Sc and PEG-IDA-Pr was also determined using the pH titration method. The extraction mechanism was discussed. The results show that Sc and Pr are extracted into the polymeric phase in the form of their complexes composed of PEG-IDA. |
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| Keywords: | separation polymer-salt-H 2O liquid-solid extraction system pH titration method stability constant scandium praseodymium |
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