Crystallization of SiO2-CaO-Na2O glass using sugarcane bagasse ash (SCBA) as silica source

This work reports the feasibility results of recycling sugar cane bagasse ash (SCBA) to produce glass-ceramic. The major component of this solid residue is SiO2 (>89%). A 100g batch composition containing ash, CaO and Na2O was melted and afterward, poured into water to produce a glass frit. The crystallization kinetic study by non-isothermal method was performed on powder samples ( 970oC, and below this temperature there is a predominance of rankinite. The crystallization activation energies calculated by the Kissinger and Ligero methods are equivalent: 374 10 kJ/mol and 378 13 kJ/mol. The growth morphology parameters have equal values n = m = 1.5 indicating that bulk nucleation is the dominant mechanism in this crystallization process where there is a three-dimensional growth of crystals with polyhedron-like morphology controlled by diffusion from a constant number of nuclei. However, DTA curves on both monolithic and powder glass samples suggest that crystallization of the powder glass sample occurs through a surface mechanism. The divergence in both results suggests that the early stage of surface crystallization occurs through a three-dimensional growth of crystals, which will then transform to one-dimensional growth.Peer reviewe