UO_2(NO_3)_2-TcO_4^--HNO_3-H_2O/TBP-OK体系萃取过程中锝分配比数学模型研究  

Simulation of Technetium Extraction Behavior in UO_2(NO_3)_2-TcO_4^--HNO_3-H_2O/TBP-Kerosene System

作　　者：张春龙[1] 何辉[1] 陈延鑫[1] 唐洪彬[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：《原子能科学技术》2012年第2期160-164,共5页Atomic Energy Science and Technology

摘　　要：通过文献报道的锝分配比实验数据与计算结果的分析和对比,引入校正函数P(c0(U),t)对现有锝分配比模型进行改进,建立了UO2(NO3)2-TcO4--HNO3-H2O/TBP-OK萃取体系中锝的数学模型,并编写了锝分配比计算程序。利用国内外相关文献报道的179组实验数据对该程序进行验证,符合情况良好。通过与锝分配比文献数据以及原模型计算结果对比,对改进后锝分配比模型的性能进行了评估,改进结果明显优于原模型。改进后的模型可作为UO2(NO3)2-TcO4--HNO3-H2O/TBP-OK体系、10～60℃、U浓度0～280g/L、硝酸浓度0.1～5mol/L范围内锝和铀萃取行为计算机模拟的基础。By comparing and analyzing lots of reported data of technetium with the com- puting results, a modification function P（C^° （U） ,t） was introduced to the existing distri- bution coefficient model of technetium, and a new mathematical model for simulating technetium extraction behavior in the system of UO2 （NO3）2-TcO4^-HNO3-H2O/TBP- kerosene was established, as well as a computer program. The reliability of the program was verified by 179 sets of distribution coefficient data, and the results were found to agree well with experimental data. By comparing the reported data of technetium with the computing results, an evaluation was made to test the performance of the revised model. It turned out that the calculation results of the new model were more reliable than that of the one reported previously. The revised model and program can be the foundation to simulating technetium extraction behavior in the system of UO2 （NO3）2- TcOi-HNO3-H2O/TBP-kerosene with the temperature scope from 10 to 60 ℃, U con- centration from 0 to 280 g/L, and nitric acid concentration from 0.1 to 5 mol/L.

关 键 词：锝 萃取 数学模型 

分 类 号：TL243[核科学技术—核燃料循环与材料]