Me-TODGA和TODGA萃取及辐照性能的对比研究  

Comparison Study of Extraction and Radiation Behavior between Me-TODGA and TODGA

作　　者：苏哲[1] 何喜红 曹智[1] 袁洁琼[1] 谢书宝[1] 张虎[1] 何辉[1] 叶国安[1] SU Zhe;HE Xihong;CAO Zhi;YUAN Jieqiong;XIE Shubao;ZHANG Hu;HE Hui;YE Guoan(Department of Radiochemistry,China Institute of Atomic Energy,Beijing 102413,China;School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an of Shaanxi Prov.710055,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413 [2]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《核科学与工程》2021年第6期1310-1316,共7页Nuclear Science and Engineering

摘　　要：N,N,N’N’-四辛基-3-氧戊二酰胺(TODGA)是最常用的酰胺荚醚类萃取剂,N,N,N’N’-四辛基-2-甲基-3-氧戊二酰胺(Me-TODGA)是TODGA的一种衍生物,有望取代TODGA应用于高放废液分离流程。本文对比研究了Me-TODGA和TODGA萃取三价锕系、镧系元素以及Sr(Ⅱ)、Zr(Ⅳ)、Pd(Ⅱ)等裂片元素的性能,并考察了吸收剂量对两者萃取性能的影响。结果表明,Me-TODGA和TODGA萃取高浓度金属离子时会出现三相,加入0.50 mol/L TBP-煤油溶液作相改良剂时,可防止三相的出现;Me-TODGA/TBP体系对于锕系、镧系、裂片元素的萃取能力弱于TODGA/TBP体系,有利于三价锕系和镧系元素反萃以及裂片元素的洗涤。Me-TODGA和TODGA萃取Eu(Ⅲ)和Sr(Ⅱ)分配比的对数值都随吸收剂量线性下降,但Eu(Ⅲ)和Sr(Ⅱ)的分离因子随吸收剂量变化较小。Me-TODGA的辐照稳定性相对于TODGA较差,加入TBP后体系的耐辐照性能有所改善。N,N,N’,N’-tetraoctyl-3-oxapentanediamide(TODGA)is the most commonly used diglycolamide extractant.N,N,N’,N’-tetraoctyl-2-methyl-3-oxapentanediamide(Me-TODGA)is a derivative of TODGA and which is a promising substitute of TODGA for high level liquid waste separation process.In this paper,the extraction of trivalent actinides,lanthanides and fission elements such as Sr(Ⅱ),Zr(Ⅳ),Pd(Ⅱ)by Me-TODGA was evaluated to compare with that of TODGA.The influence of radiolysis on extraction properties of the two diglycolamide extractants was also studied.The results show that third phase is formed with Me-TODGA and TODGA extraction at high concentration metal ion.However,it is avoided by addition of 0.50 mol/L TBP.The extraction of actinides,lanthanides and fission products with Me-TOGDA/TBP system is weaker than the TOGDA/TBP system,which is beneficial to stripping of trivalent actinides/lanthanides and scrubbing of fission elements.The distribution ratio(logarithm value)of Eu(Ⅲ)and Sr(Ⅱ)with Me-TOGDA and TOGDA decreases linearly with increasing irradiation dosage.Me-TODGA is not stable than TODGA,and the stability is improved by addition of TBP.Comparatively,Me-TODGA is not stable than TODGA.

关 键 词：酰胺荚醚 高放废液 萃取 辐照稳定性 

分 类 号：TL941.1[核科学技术—辐射防护及环境保护]