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In our sample an intermediate phase gehlenite Ca 2 Al 2 SiO 7 was observed in the 800 1100°C interval The formation mechanism of this crystalline phase can be described as follows Liao et al 2022 Table X ray Diffraction Quantitative Analysis of Crystalline and Amorphous Phases in Red Mud Samples Sintered at 700 1200°C Liao et al 2022 Phases