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Journal Articles Journal of the European Ceramic Society Year : 2005

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

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.
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Dates and versions

hal-03601619 , version 1 (08-03-2022)

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Rachida El Ouatib, Sophie Guillemet, Bernard Durand, Azzeddine Samdi, Lahcen Er-Rakho, et al.. Reactivity of aluminum sulfate and silica in molten alkalimetal sulfates in order to prepare mullite. Journal of the European Ceramic Society, 2005, 2, pp.73-80. ⟨10.1016/j.jeurceramsoc.2003.12.002⟩. ⟨hal-03601619⟩
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