Glass-Ceramics Produced by Vitrification of Coal Fly A

Biljana Angjusheva, Emilija Fidancevska

Ss. Cyril and Methodius University in Skopje, Faculty of Technology and Metallurgy, Skopje, Republic of North Macedonia,
ABSTRACT: Glass-ceramics based on CAS (CaO-Al2O3-SiO2) system was produced by controlled crystallization of vitrifi ed fl y ash. Fly ash was pre-treated by magnetic separation and nonmagnetic part of fl y ash (NFA) was used. Maximal  crystallization of parent glass occurs in the temperature region from 900 oC to 1160 oC. Glass-ceramics was produced by consolidation of parent glass i.e. pressing (45 MPa) and sintering at 950, 1000, 1050 and 1100 oC, and isothermal time at the fi nal temperature of 30, 60, 120 minutes. The dominant crystalline phase was calcium aluminum silicate (anorthite). The obtained glass-ceramics could be potentially used in construction applications.
Keywords: coal fly ash, parent glass, quenching, vitrification, glass-ceramics
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