30%TBP-正十二烷/硝酸体系中浓钚的分配行为  

Distribution Behavior of Pu in the 30%TBP-Dodecane/HNO3 System

作　　者：李传博[1] 左臣[1] 晏太红[1] 郑卫芳[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2013年第2期92-95,共4页Journal of Nuclear and Radiochemistry

基　　金：863课题资助项目(No.2009AA050702)

摘　　要：研究了温度、水相中硝酸浓度和水相中钚浓度对30%TBP-正十二烷/硝酸体系中浓钚(两相平衡后水相中Pu(Ⅳ)质量浓度为0.35～11.1g/L时)的分配比D(Pu)的影响。研究结果表明:25℃下,当硝酸浓度大于1.5mol/L时,D(Pu)随着钚浓度的增高而下降;当酸度为0.4mol/L时,钚浓度对钚分配比影响不大。当两相平衡后水相中Pu(Ⅳ)质量浓度为1.34～3.80g/L,水相中硝酸浓度分别为1.5mol/L和3.0mol/L时,在25～60℃范围,钚的分配比随温度增加而增大,最大增大率为39.4%。25℃下,当酸度分别为1.5mol/L、3.0mol/L和4.5mol/L时,30%TBP-正十二烷作为萃取剂时Pu的分配比比根据文献计算出来的30%TBP-煤油体系的值要大一些。但酸度为0.4mol/L时,两个体系中Pu的分配比接近。The effects of temperature, the concentrations of HNO3 and the concentrations of Pu（from 0.35 g/L to 11.1 g/L in the equilibrated aqueous phase） on the distribution ratio of Pu （D（Pu）） between HNO3 and 30%TBP-dodecane were studied. The results show that at 25 ℃, D（Pu） reduces with the concentration of Pu with 〉1.5 mol/L HNO3 and hardly changes with 0.4 mol/L HNO3. Within 25-60 ℃, with 1.34-3.80 g/L Pu, and 1.5 mol/L and 3.0 mol/L HNO3 in the equilibrated aqueous phase, D（Pu） increases with the tempera- ture with a highest growth percentage of 39.40/60. At 25 ℃, D（Pu） by 30%TBP-dodecane extraction is higher than the corresponding calculated value by 30%TBP-koresene extraction with 1.5 tool/L, 3.0 mol/L and 4.5 mol/L HNO3; however, similar D（Pu） values are obtained in the two systems with 0.4 mol/L HNO3.

关 键 词：钚 分配比 30%TBP-正十二烷 

分 类 号：TL242[核科学技术—核燃料循环与材料]