Time-temperature-transformation (TTT) diagram of caustic calcined magnesia

CIM Journal, Vol. 6, No. 1, 2015
K. Ebrahimi-Nasrabadi
Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad,Mashhad, Iran

M. Barati
Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario, Canada

P. W. Scott
Camborne School of Mines, University of Exeter, Penryn, Cornwall, United Kingdom

http://dx.doi.org/10.15834/cimj.2015.1
Résumé La conversion de magnésite cryptocristalline en magnésie caustique a été étudiée de manière expérimentale à des températures de 400 à 1200 °C et pour des temps de calcination atteignant 8 heures. Une analyse thermique différentielle – analyse thermique gravimétrique montre que la décomposition commence à des températures aussi basses que 340 °C et qu’elle est complète à 600 °C. La surface spécifique, l’indice d’adsorption de l’iode, la taille des cristaux et la perte au feu ont été mesurés afin de caractériser la qualité du produit. Il a été trouvé qu’une magnésie caustique calcinée de grande qualité peut être produite dans un petit écart de température (600 à 650 °C) et dans une période de temps variant entre 1 et 4 heures.
Mots clés : Magnésie caustique calcinée, magnésite, périclase, qualité de la magnésie, transformation-température-temps (TTT)
Accés complet à Document technique
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