Conversion of coal fly ash glass into glass-ceramics by controlled thermal treatment

Authors

  • Biljana Angjusheva Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University, Skopje
  • Vojo Jovanov Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University, Skopje
  • Emilija Fidanchevski Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University, Skopje

DOI:

https://doi.org/10.20450/mjcce.2021.2429

Keywords:

coal fly ash, vitrification, parent glass, consolidation, glass-ceramics

Abstract

Glass-ceramics were fabricated by controlled crystallization of glass vitrified without any additives from coal fly ash. The glass transition temperature (Tg) and peak temperature (Tp) of the parent glass were 580 ºC and 1020 ºC, respectively. The crystallization tendency of the parent glass was estimated by the Hruby-coefficient (KH = 2.3). The ratio of the crystalline and amorphous phases in the glass-ceramics sintered at 1100 ºC/60 min was 68/32. The major crystalline phases were calcium aluminum silicate (anorthite) and hematite. The density, bending strength, and E-modulus of the glass-ceramics were 2.20 g/cm3, 78 MPa, and 32 GPa, respectively. The glass-ceramics can potentially be used as a construction material.

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Published

2021-12-15

How to Cite

Angjusheva, B., Jovanov, V., & Fidanchevski, E. (2021). Conversion of coal fly ash glass into glass-ceramics by controlled thermal treatment. Macedonian Journal of Chemistry and Chemical Engineering, 40(2), 307–319. https://doi.org/10.20450/mjcce.2021.2429

Issue

Vol. 40 No. 2 (2021)

Section

Materials Chemistry

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