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本文在UO_2(NO_3)_2-HNO_3-H_2O/30％(体积)TBP-240号煤油体系萃取过程计算铀、硝酸分配系数的数学模型的基础上,利用描述铀、硝酸分配的准数R_U和R_H,得出了计算微量钚分配系数的数学模型,当钚浓度为常量时,考虑到铀、钚、硝酸对其分配的相互影响,对准数R_U进行了修正,进而得出了计算铀、钚、硝酸分配系数的数学模型。用得出的模型计算出的有机相组份浓度与实验值相比,其相对误差绝对值的平均值对微量钚、常量钚、铀和硝酸分别为11.0％,9.6％,9.4％和15.9％,准确度比国外发表的模型高。
Based on the mathematical model for the calculation of the distribution coefficient of uranium and nitric acid in the extraction process of UO_2 (NO_3) _2-HNO_3-H_2O / 30% TBP-240 kerosene system, using the mathematical models describing the distribution of uranium and nitric acid, R_U and R_H , A mathematical model for calculating the distribution coefficient of trace plutonium was obtained. When the concentration of plutonium was constant, the alignment of R_U was corrected considering the interaction of uranium, plutonium and nitric acid. Then the calculation of uranium, plutonium , The partition coefficient of nitric acid mathematical model. The average value of the absolute value of the relative error of the organic phase components calculated by the obtained model is 11.0%, 9.6%, 9.4% and 15.9% respectively for the trace plutonium, the constant plutonium, the uranium and the nitric acid, , Accuracy higher than the model published abroad.