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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 °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 °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 CaMgSi2O6 as the major phase in the glass samples isothermally heat-treated at 1000 °C. Results also indicated that the devitrification at 1000 °C and an incipient devitrification at 750 °C resulted into harder glass-ceramic materials.
Highlights
The iron ore exploitation established in the State of Minas Gerais, Brazil, produces huge amounts of residues
The purpose of this paper is to report a study to obtain a glass-ceramic material made with sandy tailing
The mineralogical characterization of the sandy tailing obtained by XRD revealed that its major components were quartz SiO2 (>50%), hematite Fe2O3 (
Summary
The iron ore exploitation established in the State of Minas Gerais, Brazil, produces huge amounts of residues. BIFs are chemically precipitated sedimentary rocks, with structures consisting of repeated thin layers (millimeter to centimeter scale) of black to dark gray colored iron oxides, either magnetite or hematite, alternating with bands of red, yellow, or cream colored layers of chert or jasper. They are exploited in the Quadrilátero Ferrífero (a region in the center of Minas Gerais) to obtain a pelletized iron ore concentrate, that can be processed by the steel industry. The remaining part is disposed of in dams as tailings and slimes with high cost and many environmental concerns
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