Group partitioning of minor actinides and rare earths from highly active liquid waste by extraction chromatography utilizing two macroporous silica-based impregnated polymeric composites

摘要

Through an advanced vacuum sucking technique,two macroporous silica-based N,N,N',N'-tetraoctyl-3-oxapentane-1,5-diamide(TODGA)and octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphoshine oxide(CMPO)polymeric composites,TODGA/SiO2-P and CMPO/SiO2-P,were synthesized by impregnating and immobilizing the chelating agents into the pores of the SiO2-P particles.To partition long-lived minor actinides(MA(III)),such as Am(III)and Cm(III)from highly active liquid waste(HLW),the loading and elution of 15 typically simulated fission and non-fission products from a 3.0 M HNO3 were performed.In the first column packed with TODGA/SiO2-P,the simulated elements were effectively separated into following groups:(1)non-adsorption group,(2)MA-ZRE-FPs group,(3)hRE group,and(4)micro quantity of Zr(IV).MA(III)was predicted to flow into the second group along with Nd(III)due to their close adsorption and elution onto TODGA/SiO2-P.In the second column packed with CMPO/SiO2-P,after conditioning the acidity in MA-lRE-FPs containing 0.05 M DTPA to 3.0M HNO3,it was separated into(1)Sr(II)and Pd(II),(2)MA-mRE,(3)/RE,and(4)Zr(IV).MA(III)was believed to flow into MA-mRE effluent along with Gd(HI)because of the similar adsorption towards CMPO/SiO2-P.In terms of the position of MA(III)appeared,an improved MAREC process for long-lived MA(HI)partitioning from HLW was proposed.