Liquidus Relationships in the CaO-corner of the Ternary System CaO-Al₂O₃-SiO₂

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Saturation lines of CaO, 2CaO·SiO₂ and 3CaO·SiO₂ in the system CaO-Al₂O₃-SiO₂ were determined at 1600 and 1700°C using a technique of solid phase dissolution in a liquid slag phase. The liquidus surface of 3CaO·SiO₂ phase was found to be larger than expected. The solubility of 2CaO·SiO₂ was found to be higher, especially at 1700°C, and the CaO solubility was found to be lower then previously known. Finally, the solubility of 2CaO·SiO₂ in the binary system CaO-SiO₂ was determined to be 2.5-3 wt% higher than in the currently accepted system.