Abstract
The lack of phase equilibria relations and liquidus surface thermodynamic information for CaO-SiO2–5 wt%MgO-Al2O3-TiO2 system has seriously restricted the comprehensive utilization of the titanium resources. In present study, the phase equilibrium relationships were investigated for CaO-SiO2–5 wt%MgO-Al2O3-TiO2 phase diagram system at 1300 °C and 1400 °C using the high temperature equilibrium technique followed by X-Ray Fluoroscopy (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive X-ray spectroscope (EDX) analysis. In the composition range studied, the liquid phase, melilite solid solution phase and CaO·TiO2 phase were found. The two-phase equilibrium of liquid coexisting with CaO·TiO2 phase was intensively dicussed, and the spatial liquidus surfaces at 1300 °C, 1400 °C and 1450 °C (data from literatures only) for liquid coexisting with CaO·TiO2 phase were first constructed in CaO-SiO2–5 wt%MgO-Al2O3-TiO2 tetrahedral phase diagram, which can realize a visual understanding of the phase relation change trendency in 3-dimensional space.
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