UO_2(NO_3)_2-Pu(NO_3)_4-HNO_3-H_2O/30％(体积)TBP-煤油体系萃取过程的数学模型——Ⅲ.计算铀、钚、硝酸分配数据的数学模型
MATHEMATICAL MODELLING OF THE SYSTEM OF UO_2(NO_3)_2-HNO_3 -H_2O/30% (VOL.) TBP-KEROSENE IN SOLVENT EXTRACTION PROCESS——Ⅲ. A MODEL FOR CALCULATING THE DISTRIBUTION COEFFICIENTS OF URANYL, PLUTONIUM NITRATES AND NITRIC ACID
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摘要: 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。Abstract: Using data published in the literature and based on the mathematical model for estimating distribution coefficients of uranium and nitric acid in system UO2 (NO3)2-HNO3 -H2O/30% TBP-kerosene, a relation for the estimation of distribution coefficients of plu-tonium in microconcentration is obtained.In the case of plutonium in macroconcentration, the effect of plutonium quantity on its distribution and on uranium distribution must be considered. Therefore the factor Ru found in system of UO2 (NO3)2-HNO3 is revised and the mathematical model for estimating distribution coefficients for plutonium, uranium nitrates and nitric acid in system of UO2 (NO3)2-Pu (NO3)4-HNO3-H2O/30% TBP-kerosene established.Using this model, the average deviation of calculated values compared with those obtained experimentally is 11.0% for micro-quantity of Pu and 9.6%, 9.4% and 15.9% for macroquantity of plutonium, uranium and nitric acid respectively.This mathematical model may be applied for the calculation and selection of technological parameter in solvent extraction process.
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