Abstract
The present research studied a set of phyllite clays from several deposits in southeast Spain. These phyllite clays have traditionally been used as sealing material to impermeabilize roofs, embankments, ponds, construction and waste landfill, with recent applications in the preparation of new mortars. However, studies on thermal behaviour and ceramic properties of phyllite clays have been scarce. The present research showed a summary of previous characterization studies on representative phyllite clays from these deposits with additional results. Mineralogical, by X-ray diffraction, and chemical, by X-ray fluorescence characterization of these samples were summarized. Thermal analysis methods (DTA–TG and thermal diffractometry) were applied to achieve a more complete mineralogical characterization. Several phyllite clay samples were selected for a ceramic study by firing pressed powdered samples up to 1300 °C. Sintered or vitrified materials, with porosities almost zero, were obtained from these phyllite clays after firing at 1100–1200 °C, with apparent densities between 2.1 and 2.4 g cm−3. Higher firing temperatures (> 1250 °C) produced deformation and expansion of the ceramic bodies. These results allowed obtain the vitrification temperature (Tv) and the temperature of the maximum bulk density (Td). According to the previous mineralogical and chemical characterization and the values of these parameters, the phyllite clay samples were classified in three varieties, as follows: (1) Micaceous, characterized by predominant layer silicates, mainly muscovite or illite, alkaline elements (mainly K2O higher than 3.5 mass%) and lower values of both Tv and Td, (2) Quartzitic, with predominant quartz and SiO2 and intermediate values of Tv and Td, and (3) Carbonaceous, characterized by predominant dolomite, medium contents of CaO and MgO and higher values of both Tv and Td. These results are interesting for the application of these phyllite clays as ceramic raw materials.
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Acknowledgements
The financial supports of Andalusian Regional Government through Research Groups AGR 107 and TEP 204 are kindly acknowledged. The authors want to dedicate this paper to Professor Víctor Orera Clemente, recently deceased, for his contribution in the field of materials research.
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Garzón, E., Pérez-Villarejo, L. & Sánchez-Soto, P.J. Characterization, thermal and ceramic properties of phyllite clays from southeast Spain. J Therm Anal Calorim 142, 1659–1670 (2020). https://doi.org/10.1007/s10973-020-10160-9
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DOI: https://doi.org/10.1007/s10973-020-10160-9