Degradation of MgO refractory in CaO-SiO2-MgO-FeO x and CaO-SiO2-Al2O3-MgO-FeO x slags under forced convection |
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Authors: | S A Nightingale B J Monaghan and G A Brooks |
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Affiliation: | (1) the Faculty of Engineering, University of Wollongong, 2522 Wollongong, NSW, Australia;(2) CSIRO Minerals, 3169 Clayton South, VIC, Australia |
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Abstract: | Experiments based on exposure of MgO to slags under forced convection flow conditions allowed the identification of different
degradation mechanisms and the assessment of the role of Al2O3 in the degradation process. Slag with no alumina present resulted in direct dissolution. Samples immersed in alumina containing
slag underwent indirect dissolution, with a spinel forming at the MgO-slag interface. At 1530 °C, the spinel was not effective
in reducing the corrosion rate, as the scattered spinel grains were easily removed from the MgO surface. At 1500 °C, the loss
of MgO was reduced due to the formation of a more cohesive spinel layer. Mechanical erosion then appears to play a greater
role. Strength of the bond between the spinel and underlying MgO needs to be considered in strategies to reduce degradation
of MgO refractories. |
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