[1H18-20] Alumina Solidified Body and Vitrified Waste

[1H19] Effects of Magnesium ion on Dissolution of Nuclear Waste Glass

*Hajime Iwata¹, Nobuyuki Sekine², Seiichiro Mitsui¹ (1. Japan Atomic Energy Agency, 2. NESI)

Keywords:Nuclear Waste Glass, Glass dissolution/alteration, Protective effect, Mg-silicate, Hydrotalcite

Static leaching tests of simulated nuclear waste glass were carried out at 90°C in an air atmosphere using a MgCl₂ solution and deionized water. As a result, in the MgCl₂ solution, temporal plateau and following resumption of glass dissolution were observed, while an ordinary dissolution behavior, which shows rate decrease with time, was observed in the deionized water. It is considered that these unique dissolution behavior in MgCl₂ solution may be related to the evolution of the Mg-containing mineral species deposited on the glass surface.