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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。
A single-stage experiment with U, Np separation using 1,1-dimethylhydrazine and a cascade test simulating a 1A tank process with PUREX flow were performed. The experimental results show that reducing the acidity, increasing the concentration of 1,1-dimethylhydrazine as a reducing agent and prolonging the reduction time are favorable for inhibiting the extraction of Np in the aqueous phase and also for the extraction from the 30% TBP-kerosene solution containing U, Np Reduction wash Np. The β (Np / U) up to 4.6 × 104 was achieved in the 1A-tank cascade with 8-stage extraction and 6-stage washes.