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选定2,6-二-(5,6-二正丙基-1,2,4-三嗪-3-取代)-吡啶(DPTP)萃取体系,以Am和Eu作为三价锕系与镧系元素的代表,实验考察平衡时间、萃取剂浓度、水相酸度等对Am与Eu萃取分配比的影响。在此基础上,提出了DPTP萃取锕系和镧系的概念流程,并用串级实验进行了验证。实验结果表明:经6级萃取、2级洗涤、6级反萃,Am的收率为98.42%,Eu的萃取率小于0.1%;有机相中Am、Eu的反萃率均大于99.9%;分离因子SFAm/Eu=45,SFEu/Am>103。
The extraction system of 2,6-di- (5,6-di-n-propyl-1,2,4-triazine-3-substituted) -pyridine (DPTP) with Am and Eu as trivalent actinides and lanthanum Department of elements representative, the experimental study of equilibrium time, extractant concentration, water phase acidity on Am and Eu extraction distribution ratio. On this basis, the concept of DPTP extraction of actinides and lanthanides was proposed and verified by cascade experiments. The results showed that the extraction yield of Am was 98.42% after 6-stage extraction, 2-stage washing and 6-stage stripping. The extraction rate of Eu was less than 0.1%. The stripping rates of Am and Eu in the organic phase were all above 99.9% Factor SFAm / Eu = 45, SFEu / Am> 103.