摘要
本文测定了三烷基氧膦(TRPO)萃取镅和镧系元素(Ce、Eu、Nd)的分配比,在实验的基础上建立了计算分配比的半经验数学模型,并利用这一模型对用30％TRPO-煤油溶液从强放废液中去除镅的多级逆流萃取中各级浓度的变化进行了计算。用模拟料液在微型环隙式离心萃取器逆流萃取实验中对计算结果进行了验证。结果表明,30％TRPO可以有效地从中等浓度硝酸介质中去除镅。据此提出了用TRPO萃取从强放废液中去除99.9‰镅的流程推荐数据。
The extraction of Americium and some lanthanides (Ce, Nd, Eu) by trialkyl phosphine oxide(TRPO)was studied.A mathematical model for computing their distribution ratios has been developed from the experimental data.The concentration profile of species in multistage countercurrent TRPO extraction process with different process parameters was computed, and the calculated results were examined with countercurrent experiment using multistage miniature centrifugal extractor in series.The results indicate that TRPO can effectively extract Am from medium concentration nitric acid solution.On the basis of the calculation, the TRPO extraction process parameters for 99.9% recovery of Am from high level radioactive waste were recommended
出处
《核科学与工程》
CSCD
北大核心
1989年第2期141-150,5-6,共10页
Nuclear Science and Engineering
