The nucleation and crystallization kinetics of glass obtained by melting coal fly ash with additives at 1550 C have been investigated. The optimum heat treatment schedule for the glass was nucleation at 825 C for 60min before crystallization at 962 C for 4h. The activation energy for crystallization of the glass-ceramics, obtained by the DDTA result, was 280.03 kJ/mol, lower than that of glass-ceramics obtained from pure reagents. The low activation energy is caused by impurities in fly ash, serving as nucleation agent. The results of XRD and SEM show that glass-ceramics developed nano-sized spherical wollastomte.
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