| Heating Transformations, Technical Properties
and Ceramic Suitability of Clays |
Y. Aboufadil1, M. Hajjaji*, A. El Idrissi Raghni1 and A. Thalal1
pages 201-205
DOI : 10.1080/0371750X.2013/851623 |
| Abstract |
| Heating transformations of calcareous chloritic-illitic and carbonate-free kaolinitic-illitic raw clays, and their mixes
were investigated in the range of 700o-1060oC using X-ray diffraction, thermal analyses and scanning electron
microscopy. Moreover, changes of bending strength, shrinkage and water absorption versus temperature and clay
content were followed. The results showed that plagioclase and sanidine together with spinel formed and persisted
in fired calcareous and non-calcareous clays respectively. In fired clay mixtures only plagioclase occurred. Formation
of the latter phase was discussed using CaO-SiO2-Al2O3 equilibrium diagram. The intensification of the neoformation
processes due to the increase of temperature together with melt formation mainly in carbonate-free clay improved
the ceramic properties to certain extent. Improvement of the mechanical strength was also observed for mixture of
clays. The reported diagrams, involving grain size distribution and chemical composition, showed that both clays
and their mixtures could be suitable for porous tiles or lightweight ceramic blocks manufacturing. |
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