Abstract
This study investigated the effects of the SiO2/Al2O3 mass ratio on the glass stability, crystallization and heavy metal immobilization of glass ceramics derived from stainless steel slag (SSS). When the SiO2/Al2O3 mass ratio decreased from 11.2 to 4.2, the glass stability and the depolymerization degree of the parent glass increased from 2.13 to 2.40 and subsequently decreased to 2.31. The predominant crystal phase of the resulting glass–ceramics changed from pyroxene and diopside to wollastonite, pyroxene, and diopside as the crystallization temperature of samples increased from 800°C to 860°C. The heavy metals, Cr and Mn, from SSS cured in the spinel of glass–ceramics, whereas the hazardous metal Ni was primarily found in pyroxene (CaNiSi2O6). In addition, the leached concentrations of hazardous metals, Ni, Mn, and Cr ions, in glass-ceramics were far below the national standard. The results showed that it is possible and safe to turn SSS into eco-friendly glass-ceramic.
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