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Effect of Al antioxidant on the rate of oxidation of carbon in MgO-C refractory
, Article Journal of the American Ceramic Society ; Volume 90, Issue 2 , 2007 , Pages 509-515 ; 00027820 (ISSN) ; Nemati, Z. A ; Mahshid, S ; Hosseini, S ; Hashemi, B ; Sharif University of Technology
2007
Abstract
Kinetics of air oxidation of MgO-C-Al refractory at 600°-1300°C were investigated using the software based on the modifled shrinking core model (KDA). Commercial bricks containing 88.5% MgO, 10% residual carbon, and 1.5% aluminum anti-oxidant were oxidized isothermally with air. Combination of experimental data with model calculations indicated gas diffusion through solid material and pores as a major controlling step. Previously observed chemisorption process was eliminated from the rate-controlling mechanism with addition of aluminum antioxidant. Comprehensive rate equations were devised for MgO-C-Al and MgO-C oxidation reactions. Overall activation energies of Q id (internal diffusion) =...