Preparation of glass-ceramics using high contents of red mud and fly ash

Abstract

The preparation of glass-ceramics with high contents of red mud ash using TiO₂ and titanium slag as nucleation agents, respectively, is proposed. The effects of different formulations on physicochemical properties, microstructure and phase composition of glass-ceramics were investigated, followed by the analysis of the crystallisation behaviours. The results showed that the primary crystalline phase was Ca₂(Al(AlSi)O₇) in both cases, while the secondary crystalline phase was (CaFeO₆Si₂) and Ca(Al₂Si₂O₈), respectively. Also, the crystallinity increased with increasing content of nucleation agent, and condensations were observed once the nucleation agent content exceeded a critical value. With the contents of TiO₂ and titanium slag to be 1 and 6·6%, respectively, the overall content of industrial solid wastes achieved 93·9 and 95·3%, respectively. The performance of as-prepared glass-ceramics can satisfy the requirements of JC/T 872–2000 standard. Therefore, this study is of great significance for the recycling of industrial solid wastes.

Keywords:

• Titanium slag
• Red mud
• Fly ash
• Glass-ceramics
• Crystallization behavior