THE USE OF BLAST-FURNACE SLAG AND DERIVED MATERIALS IN THE VITRIFICATION OF ELECTRIC ARC FURNACE DUST

The electric are furnace (EAF) dust was added to blast furnace granula ted slag or a gel produced by dissolving slag in HNO3/EtOH followed by alkaline hydrolysis and gelification, and then it was vitrified. The proportion of EAF dust used was between 5 and 30 wt pet. The physicoch emical properties of the glasses produced were studied by the X-ray po wder diffraction technique, differential thermal analysis, and transmi ssion electron microscopy (TEM). Thermal properties (dilato-metric sof tening point, glass transition temperature, and thermal expansion coef ficient) were determined. Finally, analyses were performed on leachabi lity and ecotoxicity. The results suggest that the use of either slag or slag-derived gel produces a borosilicate glass with thermal propert ies similar to those of conventional soda-lime-silicate glass.