后处理Purex流程洗锝工艺的计算机模拟 Ⅰ.计算机模拟及工艺参数分析  

Computer Simulation of Technetium Scrubbing Section of Purex Process Ⅰ.Computer Simulation and Technical Parameter Analysis

作　　者：陈延鑫[1] 何辉[1] 张春龙[1] 常利[1] 李瑞雪[1] 唐洪彬[1] 于婷[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1期19-23,共5页Journal of Nuclear and Radiochemistry

摘　　要：在串级萃取理论的基础上,编写了洗锝工艺段计算机模拟程序,程序可考察HNO3、U、Pu和Tc体系的萃取行为。通过串级实验对该程序的可靠性进行了验证。结果表明,该程序的计算值与串级实验的实验结果吻合很好,两者间的相对偏差大部分小于10%。在此基础上,利用该程序对洗锝工艺段工艺参数进行了计算分析,结果表明:洗锝工艺段洗锝效果与该工艺段所使用的硝酸总量(摩尔浓度乘以体积流量)有关,提高硝酸总使用量有利于提高锝的净化系数;在硝酸总用量不变前提下,仅靠改变硝酸浓度和流比的组合无法显著改善洗锝工艺段洗锝效果,同时,洗涤效果并非随着硝酸浓度改变而单调递变,存在拐点,该拐点处对应的酸度和流比就是该硝酸使用量下洗锝效果最好的组合。A computer program was developed to simulate technetium scrubbing section （TcS） in Purex process based on the theory of cascade extraction. The program can simulate the steady-state behavior of HNO3, U, Pu and Tc in TcS, The reliability of the program was verified by cascade extraction experiment, the relative error between calculation value and experiment value was 10% more or less except few spots. The technical parameters of TcS were analyzed by this program. It is found that the decontamination factor （DF（Tc/U）） in TcS is remarkably affected by the overall consumption （the product of molarity and volume flux） of HNO3, DF（Tc/U） is increase with the increase of the over consumption of HNO3. Changing the combination of HNO3 concentration and flow ratio can not remarkably improve the DF（Tc/U） in TcS if the overall consumption of HNO3 is fixed. An inflection point exists when DF（Tc/U） changed with HNO3 contraction, the optimum combination of HNO3concentration and flow ratio is given by this point.

关 键 词：计算机模拟 TcS工艺段 净化系数 

分 类 号：TL243[核科学技术—核燃料循环与材料]