DIFFUSIVITY OF RARE EARTHS IN POROUS ION EXCHANGERS IN EDTA SOLUTION

(整期优先)网络出版时间:1992-01-11
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Theself-diffusionofREisotopesinporouscationexchangerswithvariousparticlesizeandinseveralMR-typeresinsnEDTAsolutionsofrareearthswasstudied.TheintraparticleeffectivediffusivitiesDeofCe,TbandYbweremeasuredbyisotopicionexchange,DewasaffectedbytheconcentrationofthebulksolutionandwasseparatedintoasolidphasediffusivityDgandamacroporediffusivityDpusingKataoka′sdidisperseporemodel.Itshowsthatthemodelcanbeappliedtoexpressthekineticprocess;DemuchlargerthanDeandDgisnearlyequaltoDe.Solidphaseresistanceisamajorcomponentofresistancetotheexchangeforporousresins.