Title: Degradation mechanisms of magnesia-chromite refractories in vacuum-oxygen decarburisation ladles during production of stainless steel
Authors: Jones, Peter Tom ×
Blanpain, Bart
Wollants, Patrick
Ding, Rong
Hallemans, Bernard #
Issue Date: 2000
Publisher: I o m communications ltd inst materials
Series Title: Ironmaking & steelmaking vol:27 issue:3 pages:228-237
Abstract: Magnesia-chromite bricks are used as refractories for the refining of stainless steel in vacuum-oxygen decarburisation (VOD) ladles. Refractory wear is not uniform. In the present work, worn bricks from different zones in the ladle have been analysed, and a set of interdependent degradation mechanisms is proposed. Refractory wear as a function of position in the ladle is discussed. Slag infiltration and MgO dissolution from the refractory were observed in all samples, whereas FeOx decomposition was seen at two levels in the high wear samples. First, partial decomposition of primary chromite crystals ((Mg)[Fe3+, Cr, Al](2)O-4) occurred at the hot face of the brick. Three layers were distinguished in the reacted chromite crystals and a reaction mechanism is presented. Second, a decrease in the FeOx content of the magnesia phase occurred at the hot face of the brick. The negative effect of the presence of FeOx in magnesia-chromite refractories is discussed and the influence of the ferrostatic pressure is demonstrated. Finally, the consequences of the following phenomena are discussed: increase in brick porosity, slag infiltration, corrosion, erosion of the partially liquid bonded refractory system, and spalling and cracking. I&S/1461 (C) 2000 IoM Communications Ltd.
ISSN: 0301-9233
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Chemical and Extractive Metallurgy Section (-)
Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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