利用中空纤维膜器从铕中分离杂质锌  

Separation of Zinc (Ⅱ） from Europium (Ⅲ） by Using Hollow Fiber Membrane

作　　者：罗芳[1] 李德谦[1] 吴庸烈[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理开放实验室,长春130022

出　　处：《分析化学》2001年第10期1163-1166,共4页Chinese Journal of Analytical Chemistry

基　　金：国家重点基础研究发展规划(G1998061301);国家自然科学基金(No.29771028;29801004)资助课题

摘　　要：利用中空纤维膜器，采用逆流循环萃取法，用二（２，４，４－三甲基戊基）硫代膦酸（Ｃｙａｎｅｘ３０２）从硫酸溶液中萃取分离锌和铕。探讨了膜萃取的反应机制，考察了料液酸度、萃取剂浓度等因素对传质系数的影响，提出利用动力学竞争可以实现锌、铕混合组分的分离。研究了不同酸度、不同配比以及膜器串联的不同级数等条件对锌、铕混合物分离的影响。采用单级萃取时，只有锌被萃取，而铕不被萃取，且锌的萃取不完全；当采用膜器二级串联，经过 １００ｍｉｎ后锌的萃取率达到 ９４．９２％，而铕的萃取率仅为８．５９％；当采用膜器三级串联时，经过 ４０ｍｉｎ后，锌的萃取率达到 ９９．９％以上，而铕的萃取率仅为６．５３％。Extraction and separation of Eu3+ and Zn2+ in sulfuric acid solution was investigated by hollow fiber membrane with cyanex 302 (bis (2,4, 4-trimethylpentyl) monothiophosphinic acid) in counter-currently circulating operation. Reaction mechanism of membrane extraction and effect of extractant concentration and H concentration in aqueous phase on the mass transfer coefficient were discussed. It can be concluded that Zn2+ can be extracted completely fmm Eu3+ sulfate solution according to the kinetics competing difference. In one extractor pmcess, extraction percentage of Zn2 + was not completely and Eu3+ was not extracted. Extraction percentage of Zn2+ reached 94.92%, but Eu3+ only reached 8.59% after 100 minutes extraction in two series connectors and that of Zn2+ and Eu3++ reached 99.9% and 6.53% respectively after 40 minutes extraction in three series connectors.

关 键 词：中空纤维膜 分离 锌 铕 二(2 4 4-三甲基戊基)硫代膦酸 萃取 杂质 锌粉 还原法 制备 

分 类 号：O658[理学—分析化学]