Effects of Reaction Temperature and Time on the Aluminothermic Reduction of Magnesia

Abstract:

The present paper focuses on the experimental investigation of the aluminothermic reduction of magnesia under vacuum condition with the fixed magnesia to aluminum molar ratio of 11:6. The influences of reaction temperature and time on the reduction ratio of magnesia were studied. The chemical composition, phase constitution and morphology of the condensed magnesium and the briquettes after thermal reduction were investigated by X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectrometry. The reduction ratio of magnesia increases with the increase in the reaction temperature and time. The briquettes after thermal reduction at 1050°C-1150°C are mainly composed of the spinel, unreacted magnesia and aluminum. The briquette after 1 hrs thermal reduction at 1200°C contains corundum, magnesium aluminium oxide, trace amount of spinel, unreacted MgO and aluminium.

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 2236-2239
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.2236
• Online since: June 2012
• Authors: Peng Deng, Yu Qin Liu, Da Jian Ma, Hong Wen Ma
• Keywords: Aluminothermic Reduction, Magnesia, Magnesium

References

[1] F. Cherubini, M. Raugei and S. Ulgiati: Resources, Conservation and Recycling Vol. 52 (2008), p.1093

DOI: 10.1016/j.resconrec.2008.05.001

[2] G.L. Baker: The Stanwell magnesium project. Magnesium Ind 2001. Vol.5 (2001), p.18

[3] H.W. Ma, Y. Cao, Y. Jiang, X.W. Wu, Y.Q. Liu: Geoscience Vol. 22 (2008) p.829

[4] W.G. Yao, H.W. Ma, X.Q. Jiang, Y.Q. Liu: Geoscience Vol. 25 (2011), p.151

[5] D.J. Ma, Y.Q. Liu, H.W. Ma, P. Deng, D. Xie, in: Proceedings of 2011 World Congress on Engineering and Technology, Shanghai, China. IEEE press, Vol. 4 (2011), p.262