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冠醚对硷金属等的萃取已有很多研究,近期的如文献报道了K~+、TI~+的萃取平衡常数和最佳萃取体系的选择.关于锕系元素萃取研究的报道很少,文献报道了几种冠醚的二氯乙烷溶液对U(Ⅵ)、Np(Ⅳ)、Np(Ⅴ)、NP(Ⅵ),Pu(Ⅳ)和Pu(Ⅵ)硝酸盐的萃取,在不同的冠醚中,发现二环己基冠醚对四价Np、Pu有特别高的萃取能力,但几种冠醚对U(Ⅵ)的萃取能力都十分小.我们参照文献的结果,选择二环己基-18-王冠-6(DC18CR6)试验了对Th(NO_3)_4、ThCI_4和UCI_4的萃取,结果表明虽然U~(4+)、Th~(4+)的离子半径与Np~(4+)、PU~(4+)非常接近,但萃取行为完全不同,它们几乎完全不萃取.文献的萃取体系即使对四价锕系元素也不具有普遍有效性.本文在前文关于UO_2CI_2
Many studies have been done on the extraction of alkali metals from crown ethers. Recently, the extraction equilibrium constants of K ~ + and TI ~ + as well as the selection of the best extraction system have been reported in the literature.Recent studies on actinides extraction have been rare. The extraction of U (Ⅵ), Np (Ⅳ), Np (Ⅴ), NP (Ⅵ), Pu (Ⅳ) and Pu (Ⅵ) nitrate by several crown ethers of dichloroethane was reported. In crown ethers, dicyclohexyl crown ethers were found to have a particularly high extraction capacity for tetravalent Np, Pu, but the extraction ability of several crown ethers for U (Ⅵ) was very small.We refer to the literature results and choose dicyclohexyl The results showed that although the ionic radius of U ~ (4 +), Th ~ (4 +) and Np ~ (4+) , PU ~ (4 +) are very close, but the extraction behavior is completely different and they are almost not extracted at all. The literature extraction system is not universal even for tetravalent actinides.In this paper,