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Impact of Magnesia Grain Size on the In Situ Spinel Formation in Al2O3–MgO–C Refractories

In order to evaluate the effect of magnesia grain size on spinel formation process, four compositions with different dead burned magnesia grain sizes along with fused alumina and graphite were prepared. After pressing, samples were tempered at 220 °C and coked under reducing atmosphere at 1600 °C. Permanent Linear Change (PLC) and physical properties including Bulk Density (BD) and Apparent Porosity (AP) were measured.