Volatilization of MgO from Ludwigite in Carbothermal Reduction-Nitridation Process

Abstract:

Based on thermodynamic analysis, the reduction and volatilization of magnesium in ludwigite were studied using carbothermal reduction-nitridation method. The experimental result show that the total mass loss rate of samples increase with temperature rising, which the maximum is 52.88 wt% in the range from 1440°C to 1470°C. Magnesia in ludwigite was reduced and volatilized as gaseous magnesium vapour in the process of carbothermal reduction, and its mass loss rate go up to 98.138%. Part of the volatilized matter formed white powder deposited at the opening of furnace tube and adhered to tube wall together with boride/silicon volatilized. It was proved that there is volatilization of MgO from ludwigite in the process of carbothermal reduction-nitridation.

• Periodical: Advanced Materials Research (Volumes 295-297)
• Pages: 31-35
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.295-297.31
• Online since: July 2011
• Authors: Ran Liu, Yong Liang Gao, Xing Juan Wang, Qing Lu, Xiang Xin Xue
• Keywords: Carbothermal Reduction-Nitridation, Ludwigite, Magnesia, Thermodynamic Analysis

References

[1] Liu R., Xue X. X., Jiang T., Multipurpose Utilization of Mineral Resources, Vol. 2 (2006), p.33.

[2] Larrea J A, Sanchez D R, Baggio-Saitovitch E M, et al. Journal of Magnetism and Magnetic Materials, Vol. 2 (2002), pp.1079-1080.

[3] B. L. Lu., Inorganic Chemicals Industry, Vol. 37 (2005), pp.38-45.

[4] Y. Q. Li., C. Q. He., Mining and Metallurgical Engineering, Vol. 24 (2004), pp.47-48.

[5] J. F. Lang., B. H.Li., X. P. Zhang., Multipurpose Utilization of Mineral Resources, Vol. 2 (1997), pp.5-9.

[6] Chen J H, Sun J L, Hong Y R, et al. Journal of the Chinese Ceramic Society, Vol. 11 (2004), 1347-1351.