<報文>ゼオライトカラムにおけるウランの破過特性

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Breakthrough properties of uranium have been studied using columns packed with various zeolites. Breakthrough behavior in the acidic region was characterized by S-shaped curves for either A, X or Y zeolite columns, whereas the uranium readily flowed out of mordenite (M) or L zeolite columns. The amount of uranium adsorbed decreased in the order, Y>X>A≫M>L. In the acidic region, uranium was adsorbed inside the zeolite particles through an ion exchange reaction. More than 90% of the adsorbed UO_2^<2+> could be eluted with 0.1M Na_2CO_3. In the neutral region, no uranium flowed out owing to adsorption of its hydroxides on the surface of the particles and the wall of the column. The breakthrough ratio increased with the effluent volume in the alkaline region resulting from adsorption of hydroxides and effluence of carbonate complexes. The mutual separation was accomplished by passing the solution containing uranium and americium through the column packed with M or L zeolites; uranium was removed by the effluent and americium was retained in the column.breakthrough propertyuraniumzeolitecolumnadsorptiondesorptionamericiummutual separation
1991-03-29