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在MATLAB软件平台上,利用文献报道的610组U(Ⅳ)分配比数据分别对美国、印度及日本提出的3种不同的U(Ⅳ)分配比模型函数进行了验证,验证结果表明:3种模型计算值与实验值的相对偏差均至少在20%以上,其中以美国研究者提出的U(Ⅳ)分配比模型计算效果最佳,但仍无法直接用于模拟计算U(Ⅳ)的分配比。因此,为得到相对偏差较低的U(Ⅳ)分配比模型,以美国研究者提出的模型为基础进行修正,修正后的模型为D(U(Ⅳ))=K*(U(Ⅳ))c2(fTBP),其中K*(U(Ⅳ))=(1.4/(30×c(U(Ⅳ))+1))×K*(U(Ⅵ))×(0.054 1+0.000 658×c2(NO-3)),该模型使用范围为:平衡水相硝酸浓度为0.4~4.0mol/L,U(Ⅳ)质量浓度为5~50g/L,U(Ⅵ)质量浓度为15~150g/L,Pu(Ⅲ)质量浓度为0.4~36.3g/L,肼浓度为7×10-4~2mol/L,相对偏差在±15%以内。
In the MATLAB software platform, three different U (Ⅳ) distribution model functions proposed by the United States, India and Japan were verified respectively by using 610 groups of U (Ⅳ) distribution ratios reported in the literature. The verification results show that three kinds of U The relative deviation between the calculated value and the experimental value is at least 20%. The U (Ⅳ) distribution ratio model proposed by the American researchers is the best, but it can not be directly used to simulate the distribution ratio of U (Ⅳ) . Therefore, in order to get the U (IV) distribution ratio model with relatively low relative deviation, the modified model is based on the model proposed by the American researchers. The modified model is U (IV) = K * (U (IV) where k * (U (IV)) = (1.4 / (30 × c (U (Ⅳ)) + 1) × K * (U (Ⅵ)) × 0.054 1 + 0.000 658 × c2 (NO-3), the range of application of this model is as follows: the concentration of nitric acid in aqueous phase is 0.4-4.0 mol / L, the concentration of U (Ⅳ) is 5-50 g / L, the concentration of U L, the concentration of Pu (Ⅲ) is 0.4 ~ 36.3g / L, the concentration of hydrazine is 7 × 10-4 ~ 2mol / L, the relative deviation is within ± 15%.