正丁醛作还原剂时用TBP/煤油萃取分离铀、钚和镎的研究 Ⅰ.正丁醛反萃TBP/煤油中的N_p

SEPARATION OF N_p FROM U AND Pu WITH n-BUTYRALDEHYDE AS REDUCER FROM TBP/OK Ⅰ. STUDIES OF STRIPPING Np(Ⅵ) IN ORGANIC PHASE OF TBP/OK WITH AQUEOUS HNO 3 SOLUTION IN PRESENTING n BUTYRALDEHYDE

为了解正丁醛在还原反萃分离铀、钚、镎过程中的作用 ,以正丁醛为还原剂 ,进行了硝酸水溶液反萃含U(Ⅵ )、Np(Ⅵ )或U(Ⅵ )、Np(Ⅵ )、Pu(Ⅳ )的TBP/煤油中Np的实验研究 ,测定了串级实验时Np在各萃取器中的分布 ,讨论了正丁醛、镎、铀、硝酸浓度、相比等对镎在萃取器中分布的影响。单级实验结果表明 ,正丁醛的加入和延长正丁醛与镎的相互作用时间 ,有利于从有机相中反萃镎 ;正丁醛的加入对铀、钚分配比的影响不大 ;但铀浓度增加会增加镎的反萃。串级实验结果表明 ,镎在 1BP中的比例小于 10 % ;第二级加入正丁醛时 ,正丁醛和镎在各级的分布较合理 ,能兼顾镎的去污与反萃。为了减少铀的损失 ,需要采用较高的硝酸浓度 ;在 1BW中出现少量白色沉淀。

The studies of facts effecting on stripping Np from organic phase with HNO 3 and the determinations of Np in the stripping extractor with the reducer of n butyraldehyde are carried out. It is show that the concentration of n butyraldehyde, neptunium, uranium and HNO 3, ratio of phases effect the stripping of Np in the cascade, i.e. increasing the concentration of U and C 3H 7CHO and extending the period of interaction Np with C 3H 7CHO, the stripping ratio of Np is improving and it is reasonable for adding of C 3H 7CHO into the extractor at 2nd stage, and the amount of Np in the 1BW is less than 10 %.