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。
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.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1997年第4期315-320,共6页
Atomic Energy Science and Technology