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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。
In order to understand the role of n-butyraldehyde in the process of UF, plutonium and plutonium during the reduction and stripping, n (Ⅵ), Np (Ⅵ) and U (Ⅵ) were stripped with n-butyraldehyde as reducing agent, Np (Ⅵ), Pu (Ⅳ) in the TBP / kerosene Np experimental study, measured in the cascade experiment Np in the extractor distribution, discuss the n-butyraldehyde, uranium, nitric acid concentration, compared to Effect on the distribution of 镎 in the extractor. Single-stage experimental results show that the addition of n-butyraldehyde and the prolongation of the interaction time between n-butyraldehyde and acenaphthene are favorable for the stripping of acenaphthene from the organic phase. The addition of n-butyraldehyde has little effect on the distribution ratio of uranium and plutonium. Increasing uranium concentration will increase the 反 stripping. Cascade experiment results showed that the ratio of 镎 in 1BP was less than 10%. When n-butyraldehyde was added in the second stage, the distribution of nbutanal and 镎 was reasonable at all levels, which could take account of the decontamination and back extraction of 镎. In order to reduce the loss of uranium, a higher nitric acid concentration is required; a small amount of white precipitate appears in 1BW.