| According to previous researchers, the slag components Al₂O₃, MgO and SiO₂ are matrix components which form spinel(MgAl₂O₃) and forsterite(Mg₂SiO₄) through solid-state reactions in the reduction process of chromite. These slag components(Al₂O₃ MgO and SiO₂) have effects on the reduction process of chromite. Therefore solid-state reactions in Al₂O₃-MgO-SiO₂ under oxidation and reduction conditions have been studied. The pellets of mixed Al₂O₃, MgO and SiO₂ powders were burned in a furnace at 1300, 1400 and 1500℃ for 1, 2 and 3hrs under oxidation and reduction conditions. The burned pellets were analyzed by means of microscopy, X-ray diffraction analysis and EPMA analysis. The results of the investigation can be summarized as follows : 1) When the firing time and temperature were increased, more spinel and forsterite were formed. 2) Reduction conditions produced better results than oxidation condition. 3) When SiO₂ was contained, compared with Al₂O₃-MgO, SiO₂ exceeded the formation of slags in the reduction process of chromite. |
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