Ciencia y Tecnología de Materiales >
Instituto de Ciencias de la Construcción Eduardo Torroja (IETCC) >
(IETCC) Comunicaciones congresos >
Open Access item Crystallization of a SiO2-CaO-Na2O glass from sugarcane bagasse ash
Rincón López, Jesús María
Teixeira, Silvio R.
|Keywords:||Sugarcane bagasse ash, Waste, Glass, Glass-ceramic, Wollastonite, Crystallisation|
|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.|
|Appears in Collections:||(IETCC) Comunicaciones congresos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.