Vitrified inorganic wastes are often converted into glass-ceramics: although these products exhibit interesting properties, the processing is quite complex and expensive. This paper reports an alternative approach, based on substituting traditional feldspar fluxes in stoneware with a CaO-Al2O3-SiO2 glass, from industrial plasma vitrification of municipal solid waste incinerator fly ashes. The new materials feature low sintering temperatures, <1000°C, associated to a substantial crystallization. For an optimized balance between crystallization and densification (by introducing soda-lime glass as sintering promoter), the products exhibit remarkable mechanical properties (e.g. bending strength exceeding 100 MPa), even superior to those of traditional porcelain stoneware.
Application of an industrial waste glass in ‘glass-ceramic stoneware’
BERNARDO, ENRICO;
2011
Abstract
Vitrified inorganic wastes are often converted into glass-ceramics: although these products exhibit interesting properties, the processing is quite complex and expensive. This paper reports an alternative approach, based on substituting traditional feldspar fluxes in stoneware with a CaO-Al2O3-SiO2 glass, from industrial plasma vitrification of municipal solid waste incinerator fly ashes. The new materials feature low sintering temperatures, <1000°C, associated to a substantial crystallization. For an optimized balance between crystallization and densification (by introducing soda-lime glass as sintering promoter), the products exhibit remarkable mechanical properties (e.g. bending strength exceeding 100 MPa), even superior to those of traditional porcelain stoneware.Pubblicazioni consigliate
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