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Kinetic analysis of silicothermic process under flowing argon atmosphere
Faculty of Engineering and Information Sciences - Papers
  • Winny Wulandari, Swinburne University of Technology
  • Geoffrey Brooks, Swinburne University of Technology
  • Muhammad Rhamdhani, Swinburne University of Technology
  • Brian Monaghan, University of Wollongong
RIS ID
88013
Publication Date
1-1-2014
Publication Details

Wulandari, W., Brooks, G. A., Rhamdhani, M. A. & Monaghan, B. J. (2014). Kinetic analysis of silicothermic process under flowing argon atmosphere. Canadian Metallurgical Quarterly, 53 (1), 17-25.

Abstract

The Pidgeon process, a silicothermic reduction of calcined dolomite under vacuum, is the dominant process to make magnesium metal. Experimental data from Morsi et al., were utilised for kinetics analysis of silicothermic reduction of calcined dolomite under argon atmosphere. A number of kinetic models were assessed to evaluate the rate-controlling step in the process. The results suggest that the reaction is controlled by the solid-state diffusion of reactants with the Jander and Ginstling-Brounshtein model providing the best representation of the process kinetics. Mass transfer effects of magnesium vapour from the surface to the bulk gas phase was also analysed. These results suggest that gas-film mass transfer is not the limiting step of the kinetics. Pore diffusion through briquettes is postulated to have some effect on the kinetics but solid-state diffusion is the major rate-limiting step.

Citation Information
Winny Wulandari, Geoffrey Brooks, Muhammad Rhamdhani and Brian Monaghan. "Kinetic analysis of silicothermic process under flowing argon atmosphere" (2014)
Available at: http://works.bepress.com/bmonaghan/67/