Group separation of trivalent minor actinides and lanthanides by TODGA extraction chromatography for radioactive waste management
Group separation of trivalent minor actinides and lanthanides by TODGA extraction chromatography for radioactive waste management
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DOI：
10.1016/j.jallcom.2003.11.144
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发表时间：
2004-07
影响因子：
6.2
通讯作者：
H. Hoshi;Yuezhou Wei;M. Kumagai;T. Asakura;Y. Morita
中科院分区：
文献类型：
--
作者：
H. Hoshi;Yuezhou Wei;M. Kumagai;T. Asakura;Y. Morita
对于先进后处理工艺的开发，分离长寿命小锕系元素（MA）是最重要的任务之一。作者一直在开发一种先进的后处理工艺，即 ERIX 工艺，包括选择性分离 MA(III) [Proceedings of the JAERI-Conference 2002–2004 (2002) 225]。在这项工作中，研究了使用含有新开发的螯合萃取剂的新型二氧化硅基萃取树脂从模拟高放废液 (HLLW) 中对三价 MA 和镧系元素 (Ln) 进行基团分离。 N,N,N',N'-四辛基-3-氧杂戊烷-1,5-二酰胺 (TODGA) 是最近开发的，在浓硝酸介质中对 MA(III) 和 Ln(III) 具有高亲和力 [Solv.外部。离子交换器。 20（2002）687]。这种新型二氧化硅基萃取树脂是通过将 TODGA 浸渍到固定在平均直径为 50μm 的多孔二氧化硅颗粒中的大网络苯乙烯-二乙烯基苯共聚物中制备的。这种浸渍树脂具有动力学快、溶胀小等良好特性，适用于萃取色谱法。使用 TODGA 萃取树脂对模拟 HLLW 溶液进行分离实验的结果表明，MA(III) 和 Ln(III) 都可以与几乎所有其他 FP 元素有效分离。
For the development of an advanced reprocessing process, it is one of the most important tasks to separate long-lived minor actinides (MA). The authors have been developing an advanced reprocessing process, ERIX process, including a selective separation of MA(III) [Proceedings of the JAERI-Conference 2002–2004 (2002) 225]. In this work, group separation of trivalent MA and lanthanides (Ln) from simulated high level liquid waste (HLLW) using a novel silica-based extraction resin containing the newly developed chelating extractant was investigated. N,N,N′,N′-Tetraoctyl-3-oxapentane-1,5-diamide (TODGA) was developed recently and has high affinity for MA(III) and Ln(III) in concentrated nitric acid medium [Solv. Extr. Ion Exch. 20 (2002) 687]. The novel silica-based extraction resin was prepared by impregnating TODGA into a macroreticular styrene–divinylbenzene copolymer which is immobilized in porous silica particles with a mean diameter of 50μm. This impregnated resin has the good properties such as fast kinetics and less swelling for use in extraction chromatography. The results of separation experiments for the simulated HLLW solutions using TODGA extraction resin demonstrated that both MA(III) and Ln(III) can be effectively isolated from almost all of the other FP elements.