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000052375 084__ $$2WoS$$aNuclear Science & Technology
000052375 1001_ $$0P:(DE-HGF)0$$aWei, Y.$$b0
000052375 245__ $$aStudies on the separation of minor actinides from high-level wastes by extraction chromatography using novel silica-based extraction resins
000052375 260__ $$aLa Grange Park, Ill.$$bSoc.$$c2000
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000052375 520__ $$aTo develop an advanced partitioning process by extraction chromatography using a minimal organic solvent and compact equipment to separate minor actinides such as Am and Cm from nitrate acidic high-level waste (HLW) solution, several novel silica-based extraction resins have been prepared by impregnating organic extractants into the styrene-divinylbenzene copolymer, which is immobilized in porous silica particles (SiO2-P). The extractants include octyl(phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide (CMPO), di(2-ethylhexyl)phosphoric acid (HDEHP), and bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301). Compared to conventional polymer-matrix resins, these new types of extraction resin are characterized by rapid kinetics and significantly low pressure loss in a packed column.The results of separation experiments revealed that trivalent actinides and lanthanides can be separated from other fission products, such as Cs, Sr, and Ru in simulated HLW solution containing concentrated nitric acid by extraction chromatography using a CMPO/SiO2-P resin-packed column. Satisfactory separation between Am(III) and a macro amount of lanthanides from simulated HLW solution with pH 4 was achieved by using a newly purified Cyanex 301/SiO2-P resin. However, the Am(III) separation was very sensitive to the purity of Cyanex 301, and the improvement of its stability is an important task for practical utilization.
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000052375 7001_ $$0P:(DE-HGF)0$$aKumagai, M.$$b1
000052375 7001_ $$0P:(DE-HGF)0$$aTakashima, Y.$$b2
000052375 7001_ $$0P:(DE-Juel1)130383$$aModolo, G.$$b3$$uFZJ
000052375 7001_ $$0P:(DE-Juel1)VDB3381$$aOdoj, R.$$b4$$uFZJ
000052375 773__ $$0PERI:(DE-600)2132500-5$$gVol. 132, p. 413 - 423$$p413 - 423$$q132<413 - 423$$tNuclear technology$$v132$$x0029-5450$$y2000
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