研究采用新的无盐络合剂乙异羟肟酸 (AHA)来改善Purex流程铀线U Pu分离。萃取及洗涤体系中Pu(Ⅳ )及U(Ⅵ )的分配实验结果表明 :AHA能够很好地络合Pu(Ⅳ ) ,它既能抑制水相中Pu(Ⅳ )被 30 %TBP/OK萃取 ,又能有效地把萃取到 30 %TBP/OK中的Pu(Ⅳ )洗涤到水相。同时 ,AHA的存在不影响 30 %TBP/OK对U(Ⅵ )的萃取 A new salt-free complex, acetohydroxamic acid (AHA) was used to improve uranium U Pu separation in the Purex process. The experimental results of Pu (Ⅳ) and U (Ⅵ) in extraction and washing system show that AHA can well complex Pu (Ⅳ), which can inhibit Pu (Ⅳ) from being extracted by 30% TBP / OK in aqueous phase , But also to efficiently extract Pu (IV) extracted into 30% TBP / OK into the aqueous phase. At the same time, the presence of AHA did not affect 30% TBP / OK extraction of U (VI)