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Nucleation and Crystallization of New Glasses from Fly Ash Originating from Thermal Power Plants
Author(s) -
Barbieri Luisa,
Lancellotti Isabella,
Manfredini Tiziano,
Pellacani Gian Carlo,
Rincòn Jesus Ma.,
Romero Maximina
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00926.x
Subject(s) - anorthite , materials science , crystallization , nucleation , wollastonite , mineralogy , acicular , microstructure , fly ash , metallurgy , chemical engineering , composite material , raw material , geology , thermodynamics , chemistry , physics , organic chemistry , engineering
The nucleation and crystallization kinetics of new glasses obtained by melting mixtures of a Spanish carbon fly ash with glass cullet and dolomite slag at 1500°C has been evaluated by a calculation method. These glasses, whose microstructure was examined by TEM carbon replica, were susceptible to controlled crystallization in the 800°–1100°C range. The resulting glass‐ceramics developed acicular and branched wollastonite crystals or a network of dendritic pyroxene mixed with anorthite feldspar (SEM and EDX analysis). The time–temperature–transformation curves (processing of the XRD data) showed the crystallization kinetics and the critical cooling rate to be in the 12°–42°C/min range.