1,1-二甲基肼应用于U、Np分离的研究

摘要: 应用１，１－二甲基肼进行了Ｕ、Ｎｐ分离的单级实验和模拟ＰＵＲＥＸ流程１Ａ槽工艺的串级试验。实验结果表明，降低酸度、提高还原剂１，１－二甲基肼浓度、延长还原时间，有利于抑制水相中Ｎｐ的萃取，也有利于从含Ｕ、Ｎｐ的３０％ＴＢＰ－煤油溶液中还原洗涤Ｎｐ。在８级萃取、６级洗涤的１Ａ槽串级试验中，β（Ｎｐ／Ｕ）可达４．６×１０４。

Abstract: SEPARATION OF NEPTUNIUM FROM URANIUM IN CONTACTOR 1A WITH 1，1DIMETHYLHYDRAZINEYin Dongguang Zhang Xianye Hu Jingxin Xiao Songtao(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413)ABSTRACTThe separation of Np from U with 1,1dimethylhydrazine has been studied.The results of singlestage experiments with 1,1dimethylhydrazine as reductant or reductive reextractant show that Np can be effectively separated from U in aqueous phase or organic phase and the reduction reaction of Np(Ⅵ)—→Np(Ⅴ) with 1,1dimethylhydrazine in organic phase is slower than in aqueous phase.According to the experimental conditions of 1A in PUREX process,the simultated multistage countercurrent cascade experiments are performed with 1,1dimethylhydrazine as reductive scrub solution,the results show that the separation coefficient of Np from U is equal to 4.6×104.Keywords 1,1Dimethylhydrazine Neptunium Extraction Separation