Adsorption of Zirconium and Plutonium(Ⅳ) From Acid Solution on Silica Gel

The static adsorption of Zr and dynamic adsorption of Zr and Pu(Ⅳ) on silica gel in HNO3 solution were studied. The study results show that adsorptive capacity of Zr is about 0.225mmol/g. Adsorption of Zr increase with decrease of HNO3 concentration and silica gel size, likewise with increase of the rate of liquid to solid and Zr concentration. Zr is adsorbed but Pu(Ⅳ) is not adsorbed on silica gel column in 4 mol/L HNO3 solution so it is possible to separate Zr and Pu(Ⅳ) from acid solution by adsorption on silica gel. The adsorbed Zr on the silica gel can be efficiently eluted with 2 column volume of 0.2mol/L oxalic acid, the elutriation reaches to 99.2%, and the silica gel can be used repeatedly.