Abstract
ABSTRACTFor the direct vitirification of low level radioactive wastes containing metallic aluminum, the oxidation and vitirification of aluminum was carried out using lead borate glass as a flux. Among the six fluxes employed in this study, 0.11Na2O ・3PbO ・B2O3 was the most suitable for the oxidation and vitirification of aluminum based on the initial oxidation rate and alumina solubility. The increase of the lead fraction in the flux increased the oxidation rate, while the sodium fraction affected the alumina solubility resulting in the product maintaining its transparent appearance. The agglomerate product by the oxidation was confirmed metallic lead by X-ray diffraction analysis, and its impurities, aluminum, boron and sodium, were lower than 0.2 wt% by the quantitative analysis.
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