Iron-rich sintered class-ceramics from industrial wastes

In this study, sintered glass-ceramics made up of jarosite (a hazardous ind ustrial waste) have been obtained by sintering high-iron-content glasses. T hermal gravimetry and differential thermal analysis, carried out in differe nt atmospheres, have been utilized to explain the phase formations in the v olume and iron oxidation on the surface of the glass particles, Low-angle X RD technique has been used to investigate the distribution of the phases fo rmed on the surface of the glass during heating. The variation of density o f the powder a:nd bulk samples has been used to investigate the kinetics of phase transformation. The value of the Avrami constant, n, has been obtain ed as 1.33, which corresponds to the three-dimensional diffusion growth on a fixed number of nuclei. The sinter-crystallization process has been defin ed to yield a 40 wt% crystal phase. The results of this study have opened t he possibility of preparing glass-ceramics with an original appearance, som ewhat similar to that of granite, by reevaluating industrial wastes.