Novel mullite-based ceramics manufactured from inorganic wastes

A method towards recycling of both slate sludge and aluminium-containing residues to produce high-mullite refractory bodies is proposed. The slate powders used resulted from the cutting and polishing operations performed in the quarries. The alumina source was obtained by treating spent baths genera...

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Bibliographic Details
Published inJournal of materials processing technology Vol. 196; no. 1; pp. 101 - 108
Main Authors Oliveira, F.A. Costa, Livramento, V., Delmas, F.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2008
Subjects
Mullite
Powder technology
Refractories
Slate
Waste materials
Waste materials
Mullite
Powder technology
Refractories
Slate
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Summary:A method towards recycling of both slate sludge and aluminium-containing residues to produce high-mullite refractory bodies is proposed. The slate powders used resulted from the cutting and polishing operations performed in the quarries. The alumina source was obtained by treating spent baths generated in industrial plants dealing with manufacturing and finishing of aluminium-made architectural profiles. Samples with a composition close to Al 4SiO 8 (mullite 2:1) were produced using conventional powder technology and characterised throughout the entire manufacturing process. Optimum sintering temperatures were found to lie in the range of 1425–1450 °C. Based on both XRD and DTA/TG data, the sequence of phase transformations occurring upon heating were depicted.
ISSN:0924-0136
DOI:10.1016/j.jmatprotec.2007.05.011