N,N-二甲基羟胺对Pu(Ⅳ)的还原反萃和相应的计算机模型

REDUCTIVE BACK-EXTRACTION OF Pu(Ⅳ) WITH N,N-DIMETHYLHYDROXYLAMINE AND THE DEVELOPMENT OF THE CORRESPONDING COMPUTATION MODELING

研究了N ,N 二甲基羟胺 (DMHAN)的HNO3溶液对 30 %TBP/煤油中Pu(Ⅳ )的还原反萃行为 ,考察了N ,N 二甲基羟胺浓度、HNO3浓度、温度以及两相接触时间对Pu(Ⅳ )反萃率的影响。结果表明 :延长相接触时间能显著提高钚的反萃率 ;增加HNO3浓度、加大DMHAN的用量、升高温度均能加快钚的反萃速率 ,但当相接触时间超出一定范围时 ,这些因素都不能显著增加钚的反萃率。编写了DMHAN单级反萃Pu(Ⅳ )的计算机模拟程序 。

The reductive back extraction behavior of Pu(Ⅳ) in the simulated 1BF with N,N di methylhydroxylamine (DMHAN) is systematically investigated under conditions of various contacting time,different concentrations of reductant,different concentrations of nitric acid and series of temperatures.It is found that the higher reductant concentration,the lower acidity and the higher temperature,the higher back extraction rate of Pu(Ⅳ) is acquired.This fact is in good agreement with the reduction of Pu(Ⅳ) with DMHAN in aqueous solution.During a short contacting time (<2 min),concentration of reductant,concentration of nitric acid and temperature play important roles in the back extraction rate of Pu(Ⅳ). After contacting the two phases over 2 min,they do not increase the stripping rate obviously.A computer program is developed to simulate the behavior of DMHAN stripping Pu(Ⅳ) in 30 % TBP/OK and its calculated results are in good agreement with the experimental results.