Abstract
The smelting reduction of magnesium oxide was researched in this paper. The effect of molten slag composition and reduction temperature on percent reduction of magnesium oxide were discussed, and kinetics of smelting reduction of magnesium oxide in molten slag was studied. The results showed that the reduction extent of magnesium oxide increased by increasing either one of the following factors: the initial mass ratio of Al 2 O 3 /SiO 2 , the addition of CaF 2 , the initial molar ratio of Si/2MgO, and reaction temperature. The overall smelting reduction was controlled by mass transfer in slag with an apparent activation energy 586 kJ mol -1 .
Highlights
Magnesium is well known for its good capability and widely used in the fields of aviation, aerospace, automotive, electronics, metallurgy and chemical engineering, etc (Friedrich and Schumann, 2001; Mordike and Ebert, 2001)
Assumed that the overall process was controlled by mass transfer in slag, the rate of mass transfer in slag might be expressed as: dCMgO dt where D was the diffusion coefficient of MgO in slag, d was the effective boundary layer thickness of slag, S was the area of metal/slag interface, V was the volume of slag, and content in slag and at the metal/slag interface, respectively
- The reduction extent of MgO increased by increasing the initial mass ratio of Al2O3/SiO2, the addition of CaF2, the initial molar ratio of Si/2MgO, or reaction temperature
Summary
Magnesium is well known for its good capability and widely used in the fields of aviation, aerospace, automotive, electronics, metallurgy and chemical engineering, etc (Friedrich and Schumann, 2001; Mordike and Ebert, 2001). Two processes currently are used in magnesium production-electrolytic reduction of magnesium chloride and thermal reduction of dolomite. In order to promote the further development of magnesium production, it is necessary to carry on fundamental studies as to provide theoretical base. Several research investigations on kinetic of thermal reduction have been carried out. Barua and Wynnyckyj (1981) carried out relevant research in flowing argon and hydrogen atmosphere, respectively. Some researcher studied the kinetics of thermal reduction by other reactants, such as Fe-Si-Al alloy, aluminum and carbon (Lan et al, 1999; Li et al, 2002; Lan et al, 2003; Fu et al, 2014).
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