摘要
研究了U(Ⅳ)在分离的有机相(30％TBP-煤油)中、在两相振荡混合和逆流萃取过程中的稳定性。通过单级反萃实验研究了有机相中钚浓度、铀浓度,反萃剂的酸度和肼浓度,U(Ⅳ)用量(M_(u(Ⅳ))/M_(Pu)对钚反萃率的影响。通过串级实验研究了在1B槽工艺条件下,M_(u(Ⅳ))/M_(Pu)和U(Ⅳ)加入位置,反萃剂酸度和相比等条件的变化对铀钚分离的影响。给出了铀和钚的净化系数。
The stability of U(IV) nitrate in separated organic solution (30% TBP) and system of two phases (organic and aqueous)was studied. The results show that the oxidation of U(IV) in TBP phase is completed in about 5-7 hours. The concentration of HNO2 in the TBP phase gradually increases during the oxidation of U(IV). The losses of U(IV) are about 10-20% during cascade experiment containing uranium and nitric acid.The effects of some factors such as concentration of Pu(IV) and U(IV) in the TBP phase,concentration of HNO3 and N2H4 in aqueous phase,and U(IV)/Pu(molar ratio) on back-extraction of Pu(IV) were investigated.Through cascade experiment with simulated 1BF feed, the effects of some factors such as U(IV)/Pu (molar ratio) ,feeding point of U(IV) feed,the acidity of aqueous phase,the o/a phase ratios in the reduction zone on the separation of U/Pu were investigated. The results show that when U(IV)/Pu (molar ratio) is 8,5,3 and 2,the DF for removal of Pu from U product is always greater than or equal to 1. 36×104.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1992年第4期207-214,共8页
Journal of Nuclear and Radiochemistry
