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用单级萃取试验研究了水相ＨＮＯ３浓度和ＣＨ３Ｎ２Ｈ３浓度对３０％ＴＢＰ－煤油相从含Ｕ和不含Ｕ水相中萃取Ｎｐ行为的影响，以及反萃液中的ＨＮＯ３浓度和ＣＨ３Ｎ２Ｈ３浓度对从含Ｕ和不含Ｕ的３０％ＴＢＰ－煤油相中Ｎｐ的反萃取率的影响。试验结果表明：提高水相ＣＨ３Ｎ２Ｈ３浓度和降低ＨＮＯ３浓度有利于抑制Ｎｐ的萃取和改善Ｎｐ的反萃取。按照动力堆乏燃料后处理流程１Ａ槽工艺条件和类似于１Ｂ槽的工艺条件，以ＣＨ３Ｎ２Ｈ３为Ｎｐ的选择性还原剂，进行了串级试验。对１Ａ槽串级，Ｕ中除Ｎｐ的净化系数为１．４×１０４，对１Ｂ槽串级，Ｕ中除Ｎｐ的净化系数为１２．８。试验结果初步表明：单甲基肼作为Ｎｐ还原剂在Ｐｕｒｅｘ流程中有一定的应用前景
The effect of concentration of HNO3 and CH3N2H3 on the extraction of Np from 30% TBP-kerosene from U and U-containing UF was investigated by single-stage extraction. The effect of concentration of HNO3 and CH3N2H3 on the extraction of N Effect of Np back-extraction on 30% TBP-kerosene phase with and without U The experimental results show that increasing the concentration of CH3N2H3 in the aqueous phase and decreasing the concentration of HNO3 are favorable for inhibiting the extraction of Np and improving the Np back-extraction. In accordance with the power reactor spent fuel reprocessing process 1A slot process conditions and process conditions similar to the 1B tank to CH3N2H3 Np selective reductant conducted a cascade test. On the 1A tank cascade, the purifying coefficient of U except Np is 1.4 × 104, and the cascade of 1B tanks, the purifying coefficient of U except Np is 12.8. The preliminary test results show that: Monomethylhydrazine as a Np reductant in the Purex process has a certain application prospects