络合剂用于 Purex 流程中铀线低浓镎、钚分离的研究

STUDY ON SEPARATION OF Np AND Pu FROM U IN Purex UCYCLE PROCESS BY COMPLEXING AGENT

对络合剂用于提高Ｐｕｒｅｘ流程铀线低浓Ｎｐ、Ｐｕ分离效果的可能性进行了初步探索。比较了几种羧酸型络合剂对Ｎｐ、Ｐｕ、Ｕ的络合分离效果。研究了络合剂浓度、ＨＮＯ３浓度、温度、相比、时间等因素的影响。模拟料液的逆流串级实验结果表明：采用合适的络合剂能显著改善Ｕ中Ｎｐ、Ｐｕ的分离效果，Ｕ－Ｎｐ分离系数增大１００—３００倍，Ｕ－Ｐｕ分离系数增大近１个数量级。

he work is a preliminary investigation on the application of complexing agents to the improvement of U/Np and U/Pu partition. The batch distribution experiments are carried out with some aliphatic dicarboxylates and hydroxycarboxylates as complexing agents. The effects of varing complexing agent and nitric acid concentration, phases ratio,temperature and contaction time on the DNp and DPu in their extraction and reextraction process are studied in detail. A simulated solution to second uranium cycle are used for cascade extraction technique to demonstrate SFNp/U and SFPu/U, which is 100-300 fold and ten fold respectively larger than those for hydroxylamine as reductant.