【摘要】 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更多还原

【Abstract】 The effects of concentration of HNO 3,CH 3N 2H 3 on extraction percentage of Np from aqueous phase containing UO 2 2+ and not containing UO 2+ 2 by 30%TBP kerosene and the effects of concentration of HNO 3,CH 3N 2H 3 in stripping solution on stripping percentage of Np from 30%TBP kerosene loading UO 2(NO 3) 2 and not loading UO 2(NO 3) 2 are studied.The results show that increasing concentration of CH 3N 2H 3 and decreasing concentration of HNO 3 are favorable to restrain extraction of Np and to accelerate stripping of Np.The results of multistage countercurrent cascade experiments of 1A and 1B contactors with CH 3N 2H 3 as reductant show that separation of Np U is most satisfactory.The separation coefficient of Np from U in 1A and 1B contactors is 1.4 ×10 4 and 12.8, respectively.Based on the above results,it can be concluded that monomethyhydrazine is a better selective reductant of Np(Ⅵ)in Purex process.更多还原