【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。更多还原

【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.更多还原