Use of organophosphorus extractants impregnated on silica gel for the extraction chromatographic separation of minor actinides from high level waste solutions

摘要: Silica-gel has been used as an inert support for the extraction chromatographic separation of actinides and lanthanides from HNO3 synthetic high level waste (HLW) solutions. was impregnated with tri-butyl phosphate (TBP), to yield STBP; 2-ethylhexyl phosphonic acid, mono ester (KSM-17, equivalent PC-88A), SKSM; octyl(phenyl)-N,N-diisobutyl carbamoylmethylphosphine oxide (CMPO), SCMPO; trialkylphosphine (Cyanex-923), SCYN sorption Pu(IV), Am(III) Eu(III) solutions studied batchwise. Several parameters, like time equilibration, Pu(IV) concentrations were varied. The uptake 3.0M followed order SCMPO>SCYN>SKSM>STBP. With increasing concentration, DPu increased up STBP, SKSM SCMPO then decreased. In case Am Eu SCMPO, D values initially between 0.5 1.0M HNO3, remained constant 5.0M slightly decreased at 7.5M. Also, effects NaNO3, Nd(III) U(VI) on evaluated. NaNO3 concentration 3.0M, DAm almost while it observed that decreases drastically by adding or U(VI). Pu pressurized heavy water reactor (PHWR-HLW) in presence uranium after depleting content, finally column U-depleted PHWR-HLW have carried out. Using Pu, U obtained HLW solution. These metal ions subsequently eluted using various reagents. results silica-gel several phosphorus based extractants compared. Am, rare earths compared those where CMPO sorbed Chromosorb-102, Amberchrom CG-71 styrene divinylbenzene copolymer immobilized porous silica particles.