The present work illustrates the conversion of wastes, like panel glass from dismantled cathode ray tubes, mining residues from feldspar excavation and lime from fume abatement systems of the glass industry, into two glasses which were subjected to a sinter-crystallization process. The surface mechanism of nucleation, starting from finely ground powders (<37μm) allowed a rapid crystallization at a relatively low temperature (2h at 880°C), with the preparation of glass-ceramics possessing a complex of mechanical properties (bending strength and microhardness exceeding 60 MPa and 6.3 GPa, respectively) comparable of that of commercial glass-ceramics and natural stones for building applications, coupled with a good chemical durability. This feature, together with the type of crystals developed, was reasonably correlated to the fluorine content of the parent glasses.
Vitrification of wastes and preparation of chemically stable sintered glass-ceramic products
BERNARDO, ENRICO;
2006
Abstract
The present work illustrates the conversion of wastes, like panel glass from dismantled cathode ray tubes, mining residues from feldspar excavation and lime from fume abatement systems of the glass industry, into two glasses which were subjected to a sinter-crystallization process. The surface mechanism of nucleation, starting from finely ground powders (<37μm) allowed a rapid crystallization at a relatively low temperature (2h at 880°C), with the preparation of glass-ceramics possessing a complex of mechanical properties (bending strength and microhardness exceeding 60 MPa and 6.3 GPa, respectively) comparable of that of commercial glass-ceramics and natural stones for building applications, coupled with a good chemical durability. This feature, together with the type of crystals developed, was reasonably correlated to the fluorine content of the parent glasses.Pubblicazioni consigliate
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