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

AuthorsTeixeira, Silvio R.; Romero, Maximina; Rincón López, Jesús María
Issue Date2010
PublisherJohn Wiley & Sons
CitationJournal of the American Ceramic Society, 93 (2010) 450–455
AbstractThis 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 (<63m) at five different heating hates. Wollastonite is the major phase in crystallization at T > 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.
Publisher version (URL)DOI: 10.1111/j.1551-2916.2009.03431.x
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