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Título

Crystallization of a SiO2-CaO-Na2O glass from sugarcane bagasse ash

AutorRomero, Maximina; Rincón López, Jesús María; Teixeira, Silvio R.
Palabras claveSugarcane bagasse ash
Waste
Glass
Glass-ceramic
Wollastonite
Crystallisation
Fecha de publicación2009
SerieS04-11
ResumenThis 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 (<63μm) at five different heating hates. Wollastonite is the major phase in crystallization at T>970°C, 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.
DescripciónEn: 1st Spanish National Conference on Advances in Materials Recycling and Eco – Energy Madrid, 12-13 November 2009.-- Editors: F. A. López, F. Puertas, F. J. Alguacil and A. Guerrero.-- 4 pages, 4 figures, 1 table.
URIhttp://hdl.handle.net/10261/18490
ISBN978-84-7292-3980-0
Aparece en las colecciones: (IETCC) Comunicaciones congresos
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