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Title: | Crystallization of a SiO2-CaO-Na2O glass from sugarcane bagasse ash |
Authors: | Romero, Maximina; Rincón López, Jesús María; Teixeira, Silvio R. | Keywords: | Sugarcane bagasse ash Waste Glass Glass-ceramic Wollastonite Crystallisation |
Issue Date: | 2009 | Series: | S04-11 | Abstract: | 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 (<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. | Description: | En: 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. | URI: | http://hdl.handle.net/10261/18490 | ISBN: | 978-84-7292-3980-0 |
Appears in Collections: | (IETCC) Comunicaciones congresos |
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