Carbothermal reduction of sillimanite in a transferred arc thermal plasma reactor

Conversion of sillimanite to value-added ceramic materials was investigated by transferred arc plasma processing using nitrogen as the plasma gas. Plasma processing was carried out using sillimanite and sillimanite–carbon mixtures at different power levels. The products were characterized by XRD, SE...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2013-01, Vol.36, p.174-178
Main Authors: Vijay, M., Ananthapadmanabhan, P.V., Ramachandran, K., Hiremath, G., Mathai, C.B., Nalini, B., Pillai, B.C.
Format: Article
Language:English
Subjects:
Alumina
Alumina–silicon carbide
Aluminum oxide
Carbothermal reduction
Mullite
Sillimanite processing
Transferred arc plasma processing
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Summary:Conversion of sillimanite to value-added ceramic materials was investigated by transferred arc plasma processing using nitrogen as the plasma gas. Plasma processing was carried out using sillimanite and sillimanite–carbon mixtures at different power levels. The products were characterized by XRD, SEM and FTIR techniques. Thermodynamic analysis using free energy minimization principle was used to predict the products formed and also analyze the experimental results. The results of these investigations showed that sillimanite can be converted to mullite, or alumina and silicon carbide by careful choice of the operating conditions and sillimanite–carbon ratio. ► Sillimanite was converted into mullite, alumina and silicon carbide. ► Transferred arc plasma process was used for carbothermal reduction of sillimanite. ► Free energy minimization principle was used to predict the products formed. ► Choice of plasma operating conditions and sillimanite–carbon ratio decide products.
ISSN:0263-4368
2213-3917
DOI:10.1016/j.ijrmhm.2012.08.012