钍-铀燃料后处理中新萃取剂的研究——Ⅳ.N-正辛基己内酰胺对主要裂片元素的萃取及γ辐照对萃取行为的影响

RESEARCH ON NEW EXTRACTANTS FOR REPROCESSING OF SPENT Th-U FUEL Ⅳ. EXTRACTION OF FISSION PRODUCTS FROM NITRIC ACID AND AFFECTION OF γ-RAY IRRADIATION ON EXTRACTION BY OCTYLCAPROLACTAM

摘要: 研究了N-正辛基己内酰胺(OCLA)从硝酸介质中对主要裂片元素Zr、Nb、Ru及Cs的萃取性质并和相同条件下的TBP萃取性质作比较。结果表明,OCLA的萃取性质类似于TBP,但在相同条件下,OCLA萃取主要裂片元素的分配系数要比TBP高。还研究了辐照对OCLA及TBP萃取性质的影响。OCLA的辐照稳定性比TBP好,特别是辐照对萃取锆的影响比TBP萃取锆的影响小得多。

Abstract: In this paper,the extraction of fission products from nitric acid media and affection of gamma ray irradiation on their extraction ability by OCLA is described. All studies about OCLA were compared with TBP at same experimental conditions. The rules of distribution ratios of fission products as a function of aqueous nitric acid concentration is similar for both OCLA and TBP. The distribution ratio of the main fission products with OCLA is higher than those with TBP. Moreover, OCLA has better stability to radiolysis than TBP. Especially, the influence of gamma irradiation on extraction of Zr by OCLA is much smaller than by TBP.