利用中空纤维膜器从铕中分离杂质锌

利用中空纤维膜器，采用逆流循环萃取法，用二（2，4，4-二甲基戊基）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，考察了料淮酸度、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%。

Separation of Zinc? from Europium? by Using Hollow Fiber Membrane

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.