Abstract
The liquidus in the high basicity region in the Al 2O 3(30 mass%)-CaO-MgO-SiO 2 system were determined experimentally at 1773 and 1873 K using the quench technique followed by EPMA analysis. Based on the experimental data, a phase diagram of the Al 2O 3(30 mass%)-CaO-MgO-SiO 2(<20 mass%) section was constructed for 1773 and 1873 K. The solubilities of 2CaO.SiO 2 and 3CaO.SiO 2 at 1773 K were found to be considerably higher in comparison with the existing phase diagram. Even the solubility of MgO at 1873 K was found to be somewhat higher. In addition, the activities of MgO, CaO and Al 2O 3 at 1773 K were estimated using the phase diagram information.
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