Reaction sintered glass: a durable matrix for spinel-forming nuclear waste compositions
作者： W.L. Gong , W. Lutze , R.C. Ewing
DOI: 10.1016/S0022-3115(99)00226-3
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摘要: Abstract Glass formation by reaction sintering under isostatic pressure is an innovative process to vitrify refractory-rich high-level radioactive waste. We used a typical defense waste composition, containing spinel-forming components such as ∼4 wt% of Cr 2 O 3 , ∼23 Al ∼13 Fe and ∼9 UO with CeO simulating . Reaction sintered silicate glasses loading up 45 were prepared within three hours, hot pressing at 800°C. The glass former was amorphous silica. Simulated added calcined oxides. samples characterized using scanning analytical electron microscopy. results show that extensive took place continuous phase formed. Waste Na O, CaO, MnO dissolved completely in the phase. only partially due incomplete dissolution (Al ) or super-saturation reprecipitation (Cr ). precipitation mechanism related time dependent alkali content developing Short-term corrosion tests water showed are chemically more durable than melted nuclear glasses. Based on hydration energies calculations, long-term chemical durability our expected be comparable rhyolitic tektite
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