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本文叙述了溶剂种类、酸度和冠醚浓度诸因素对二环己基18冠6(DCH 18 C 6)萃取铀、钚等元素的影响,着重研究了常量铀的萃取行为。结果表明,1,1,2—三氯乙烷作溶剂时,DCH18 C 6对微量铀或常量铀均能萃取。在硝酸体系形成的萃合物中,Pu(Ⅳ)和U(Ⅵ)与二环己基18冠6的分子比分别为2和1。DCH 18 C 6-1,1,2—三氯乙烷能够从含有U(Ⅵ)和U(Ⅳ)的3—5 M HCl溶液中单独萃取U(Ⅵ)而不萃取U(Ⅳ)。
In this paper, the effects of solvent type, acidity and crown ether concentration on the extraction of uranium, plutonium and other elements from DCH 18 C 6 were described. The extraction behavior of constant uranium was studied. The results show that DCH18 C 6 can extract trace uranium or constant uranium when 1,1,2-trichloroethane is used as a solvent. In the complex formed by nitric acid system, the molecular ratio of Pu (Ⅳ) and U (Ⅵ) to dicyclohexyl 18-crown 6 are 2 and 1, respectively. DCH 18 C 6-1,1,2-trichloroethane is capable of extracting U (VI) alone without extracting U (IV) from a 3-5 M HCl solution containing U (VI) and U (IV).