Phase Transitions and Structural Characteristics during Vitrification of High-Level Liquid Waste
In order to investigate the effect of high-level liquid waste dosage during vitrification of high-level liquid waste(HLW),based on the borosilicate glass vitrifying the high-sulfur high-sodium HLW,the impact of simulant high-sulfur high-sodium HLW dosage on the phase transitions and the structural characteristics of the vitrification process were investigated.The results show that the main phase trabformation involved in the melting process is the decomposition of NaNO3,and the crystallization and melting of augite.With the increase of the amount of simulated waste liquid,the temperature of complete NaNO3 decomposition increases,the temperature of pyroxene crystallization increases,the temperature of pyroxene melting decreases,and the formation temperature of uniform melt without crystalline phase will be low.The sample structure characteristic of the melting process of the mixture shows that the higher the simulant HLW dosage and the melting temperature of the feed,the narrower the distribution of the foam layer.With the increase of HLW simulant dosage from 12%to 25%,the maximum expansion rate of the melter feed decrease from 358%to 262.5%.
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