Characterization and thermal behavior of Jebel Ressas clay
Written by sctunisie no commentsThe present study deals with the Jebel Ressas clay thermal behavior related to its mineralogical composition. The mineralogical study of the material consisted on the characterization of the fine fraction by chemical analysis (CA), X-ray diffraction (XRD), infrared spectroscopy (IR) and cation exchange capacity (CEC). The results show that the material is an interstratified illite-smectite mixed with kaolinite. The illite phase in the purified fraction is about 80 %. The CEC and the specific area values of the purified fraction are respectively 39.93 meq/100g of fired clay and 325 m2/g. The thermal behavior of the raw clay is determined by differential thermal analysis (DTA), thermogravimetric analysis (TGA), dilatometry and dry feature. The clay has dehydration, dehydroxylation and carbonate decomposition temperatures respectively at 92°C - 281°C, 503°C and 732°C, a low loss of weight (5.39 %) with a low shrinkage after drying (Rs = 2.39 %) and firing (Rc = 1.8 %) treatments. The temperature of vitrification is about 820°C. This clay sample is suitable for the manufacture of ceramic tiles.
K. Nahdi, N. Gasmi, M. Trabelsi Ayedi, N. Kbir-Ariguib
illite, thermal analysis, thermogravimetric analysis, ceramic, Jebel Ressas clay
Pages 1125-1134