氚在30%TBP-煤油-HNO_3体系中的萃取机理

    • 摘要: 通过测定氚在30%TBP-煤油-HNO3间的分配比,探讨了氚在该体系中的萃取机理。实验发现,未经降解的溶剂中的氚易为水洗掉。其萃取机制为氚被两相中的HNO3和H2O中的H均匀稀释,而经辐照降解的溶剂(包括稀释剂及萃取剂和二者组成的溶液)其萃取的氚经洗涤后有明显的保留,在辐解的同时由于游离基反应而进入溶剂中的氚则更难洗下。为在动力堆乏燃料后处理中更好地控制氚的走向,建议采用高效、快速、分相完全的萃取装置。

       

      Abstract: THEEXTRACTIONMECHANISMOFTRITIUMIN30%TBP┐KEROSENE┐HNO3SYSTEMLiuJiang(ResearchCenterforEco-EnvironmentalSciences,theChineseAcademyofSciences,Beijing100085)HuHuaizhong(ChianInstituteofAtomicEnergy,P.O.Box275(26),Beijing102413)ABSTRACTTheextractionmechanismoftritiumhasbeenstudiedbydeterminingthedistributioncoeficientoftritiumin30%TBP-kerosene-HNO3-H2Osystem.Ithasbeenfoundthattritiuminunirradiatedsolventiseasytobewashedoutwithwater.Themechanismoftritiumextrac-tionisbasedonthewel-distributeddilutionoftritiumbetweentwophases.Thereisanobvi-ousretentionoftritiuminthesolventafterwashingofirradiatedsolventbywater.Someoftritiumenterthestructureofsolventsduringtheiradiationperiodbyfreeradicalpolymer-izationreaction.Soweproposetousethehighlyeficientequipmentswhichcanisolatetheorganicphaseandaqueousphaserapidlyandcompletelyinordertocontrolthetrendoftri-tiuminreprocessingprocessofspentfuelfrompowerreactous.KeywordsTritiumExtractionDistributioncoeficientTBP

       

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