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Reactivity of aluminum sulfate and silica in molten alkalimetal sulfates in order to prepare mullite

El Ouatib, Rachida and Guillemet-Fritsch, Sophie and Durand, Bernard and Samdi, Azzeddine and Er Rakho, Lahcen and Moussab, Redouane Reactivity of aluminum sulfate and silica in molten alkalimetal sulfates in order to prepare mullite. (2005) Journal of the European Ceramic Society, vol. 2 . pp. 73-80. ISSN 0955-2219

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2003.12.002

Abstract

With the aim of preparing mullite, reactions between aluminum sulfate and silica in appropriate proportions and molten sulfate media M2SO4 (M=Na and/or K) were performed at different temperatures. The powders obtained were characterized by XRD, FT-IR, SEM and TEM. The reactivity was the same in Na2SO4 and (K,Na)2SO4 media. The best results in terms of yield (98.3%) and weight of mullite produced (95%) were obtained in Na2SO4 at 950 °C. The mullite phase exhibits an acicular morphology (75×0.75 μm) and a specific surface area close to 20 m2/g. In K2SO4 medium, a potassium alumino silicate is formed as well as mullite.

Item Type:Article
Additional Information:http://www.sciencedirect.com/science/journal/09552219
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université Hassan II Casablanca - UH2C (MOROCCO)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Thomas Bonnecarere

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