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Vol. 25 No. 7 (2013): Vol 25 Issue 7

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Thermodynamic and Experimental Analysis on Vacuum Silicothermic Reduction of MgO in Molten Slags

https://doi.org/10.14233/ajchem.2013.13838
Qifeng Tang
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China ; National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, P.R. China
Jiacheng Gao
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China ; National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, P.R. China
Xiaohua Chen
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China ; National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, P.R. China

Corresponding Author(s) : Jiacheng Gao

gaojch@cqu.edu.cn

Asian Journal of Chemistry, Vol. 25 No. 7 (2013): Vol 25 Issue 7

Abstract

Smelting reduction, a new magnesium production process, has been investigated. At high temperature, appropriate mixture of Al2O3 and SiO2 with calcined dolomite can make charge to form molten slag and reduction reaction take place between liquid MgO and liquid ferrosilicon. Smelting reduction on molten slag of the compositon 55 % calcined dolomite (32 % CaO and 23 % MgO), 35 % Al2O3, 10 % SiO2 reacted with ferrosilicon was studied. By thermodynamic analysing, the semlting reduction could react at 1873 K under atmosphere. The experiments of semlting reduction were carried out under vacuum for avoiding re-oxidation of Mg vapour and the results showed that reduction extent of MgO was achieved up to 97 % with 1X silicon stoichiometry at 1873 K for 2 h.

Keywords

Slag Calcined dolomite Smelting reduction Thermodynamic analysis Silicothermic reduction
Tang, Q., Gao, J., & Chen, X. (2013). Thermodynamic and Experimental Analysis on Vacuum Silicothermic Reduction of MgO in Molten Slags. Asian Journal of Chemistry, 25(7), 3897–3901. https://doi.org/10.14233/ajchem.2013.13838
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