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

CIM Journal, Vol. 6, No. 1, 2015, pages 42-50

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
Abstract The conversion of cryptocrystalline magnesite to caustic magnesia was studied experimentally at temperatures of 400–1,200°C and for calcination times of up to 8 h. A differential thermal analysis–thermal gravimetric analysis showed that decomposition begins at temperatures as low as 340°C and is completed at 600°C. Specific surface area, iodine adsorption number, crystallite size, and loss on ignition were measured to characterize the product quality. It was found that high-quality caustic calcined magnesia can be produced in a narrow temperature (600–650°C) and time range (1–4 h).
Keywords: Caustic calcined magnesia, Magnesia quality, Magnesite, Periclase, Time-temperature-transformation (TTT)
Résumé Afin de bien choisir une technologie de procédé, nous avons développé une méthodologie basée sur une approche en deux étapes. La première étape comprend une évaluation des technologies disponibles, suivie du listage des meilleures technologies en se basant sur la modélisation des bilans massique et énergétique, l’analyse financière et l’analyse des risques. La seconde étape comporte une analyse détaillée qui utilise des données d’entrée plus précises, une modélisation des bilans massique et énergétique ainsi qu’une estimation des coûts en capitaux et d’exploitation, en plus d’une analyse financière encore plus détaillée. Une étude de cas traitant du choix de technologies dans l’élaboration du fer pour une compagnie de la Fédération de Russie est présentée pour illustrer les éléments critiques de la méthodologie et du processus d’analyse.
Mots-Clé Magnésie caustique calcinée, magnésite, périclase, qualité de la magnésie, transformation-température-temps (TTT)
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