Preparation and Characterization of Glass-ceramic Composites from South African Coal Fly Ash: A Recent Study

Despite the fact that fly ash is mostly used in the construction industry in South Africa, a considerable amount of it is nevertheless dumped. Fly ash devitrification for the production of glass-ceramic composites has steadily become one of the applications being investigated internationally. The exploration of creating glass-ceramic composites from fly ash, various amounts of beverage waste glass, and magnesium oxide as key raw materials is reported in this paper. Fly ash was melted to make glasses. An arc furnace is used to melt the metal and its additives. The glasses were crystallised using a double-staged thermal treatment to generate glassceramic composites based on their behaviour when subjected to differential thermal analysis. X-ray diffraction, scanning electron microscopy, mechanical, and chemical tests were used to evaluate the composition and behaviour of the glass-ceramic composites. As the magnesium oxide content in the glass-ceramic composites grew, so did the crystal content. The amount of content was increased. As the magnesium oxide content increased, the desirable diopside phase diminished, resulting in the development of forsterite and anorthite as the major and second major phases, respectively. Chemically and thermally resistant, the glass-ceramic composites with lower magnesium oxide content also displayed good cold compressive strength.

Author (s) Details

A. Modiga
Mintek, 200 Malibongwe Drive, Randburg, 2194, South Africa.

N. Sosibo
AECI Mining Chemicals, Corner of Bergius Road and Henry Street, Sasolburg, 1947, South Africa.

Mr. N. Singh
University of Johannesburg, Mineral Processing and Technology Research Centre, Department of Metallurgy, School of Mining, Metallurgy and Chemical Engineering, Faculty of Engineering and the Built Environment, Corner Siemert & Beit Streets, Doornfontein, 2028, South Africa.

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