Conversion of sandy tailing from banded iron formation exploitation into glass-ceramic materials

Abstract

Glass-ceramic materials made of 40.0 wt. (%) of sandy tailing from banded iron formation exploitation and 60 wt. (%) of slag from steelwork were analyzed. Vitrification was obtained by heating the batch samples up to 1400 deg;C for 1 hour and quenching the melt on a stainless steel plate. Devitrification was obtained by heat-treating the as-quenched glass samples in isothermal conditions at 750 and 1000 deg;C for 2 hours. FTIR spectroscopy analysis on the devitrified samples indicates a peak shift towards higher wave number with respect to the as-quenched glass because of the crystallization. XRD analysis revealed the presence of crystalline diopside CaMgSi 2O 6 as the major phase in the glass samples isothermally heat-treated at 1000 deg;C. Results also indicated that the devitrification at 1000 deg;C and an incipient devitrification at 750 deg;C resulted into harder glass-ceramic materials.