ION EXCHANGE CHARACTERISTICS OF PALLADIUM FROM A SIMULATED RADIOACTIVE LIQUID WASTE

摘要

Radioactive high-level liquid wastes contain significant quantities of platinum group metals (PGM) such as Pd(Ⅱ), Rh(Ⅲ) and Ru(Ⅲ). The PGM are produced as fission products in nuclear reactor. In this study, batch and column experiments were carried out to investigate the ion exchange characteristics of Pd(Ⅱ) including the effects of the ionic group of ion exchangers and the concentration of nitric acid by various anion exchangers such as IRN 78 and Dowex 1x8 and also the elution characteristics of Pd(Ⅱ) by various eluents. Anion exchangers such as Dowex 1x8 with the ionic group of quaternary methyl ammonium had a higher capacity than anion exchanger such as IRN 78 with amine group for the adsorption of Pd(Ⅱ). Especially, new type anion exchanger, AR-01 with quaternary and tertiary benzimidazole groups showed very strong. Pd(Ⅱ) could be easily eluted by 0.5 M thiourea and 0.1 M nitric acid mixed solution.