Comparison of Mineralogical Changes during Thermal Processing of Limestones

Thermal treatment of materials involves phase transformations. In the case of conventional laboratory furnace or in an industrial process, the samples are analysed after cooling. In this way, these phases can be monitored. A possible solution is non-ambient XRD analysis. Using HT-XRD analysis, it is possible to monitor the mineralogical composition at different temperatures in real time. The results of measurements on chemically precipitated limestone and limestone from the Cretaceous era show slight differences in temperature of decarbonation, but not clearly demonstrated the presence of unstable phases. This measurement, however, allowed the observation of a change in the size of the crystallites in the change of temperature.