Abstract
Thermal transformations of talc-carbonate rocks consisting of talc, chlorite, mica/illite, quartz, feldspar and calcite were investigated in the range of 900°-1100°C by X-ray diffraction, thermal analyses, scanning electron microscopy and energy dispersive spectroscopy. Microstructural changes of heated decarbonated samples were also investigated, and variations of some ceramic properties against temperature were followed. In the heated raw samples, olivine and enstatite together with merwinite were formed at T<1000°C from breakdown of chlorite. At T>1000°C, akermanite and monticellite were developed from talc, and shrinkage was almost unchanged. Heating of decarbonated samples yielded olivine and enstatite together with Mg-spinel on the expense of talc. In this case, a vitreous phase was also formed and shrinkage got increased. The neoformation processes in both the samples were discussed based on the SiO2-MgO-CaO and SiO2-Al2O3-MgO phase diagrams. Considering the magnitudes of the studied ceramic properties, the raw and carbonate-depleted materials could be suitable for manufacturing insulating firebricks and extruded ceramic tiles (group AIII) respectively.
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