Investigation of CaO/Al2O3 Mass Ratio on the Properties and Structure of Ce2O3-Containing CaO–Al2O3-based Tundish Flux

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Abstract
The properties and structure of Ce2O3-containing CaO–Al2O3-based tundish flux with different w(CaO)/w(Al2O3) have been investigated by hemispherical melting point method, the rotating cylinder method, and Raman spectroscopy, respectively. Results suggested that the melting temperature decreased from 1340°C to 1309°C, softening temperature from 1337°C to 1304°C, while the fluidity temperature changed not profound as the w(CaO)/w(Al2O3) from 0.9 to 1.3. The melting properties remained relatively steady when w(CaO)/w(Al2O3) was above 1.1. An increase in the w(CaO)/w(Al2O3) led to a decrease in viscosity, breaking temperature, and activation energy. A good property of the slag with w(CaO)/w(Al2O3) ranged from 1.1–1.3 in the current work. The main structural units of the AlO4-tetrahedral were Q2Al, Q3Al, and Q4Al, while the major structural units of SiO4-tetrahedral were Q0Si, Q1Si in the current system. With the increasing w(CaO)/w(Al2O3), the polymerized units Q3Al, and Q4Al were modified to Q2Al in aluminate structure. In silicate structure, the Q1Si unit was modified to Q0Si with the increasing w(CaO)/w(Al2O3). CaO could exert a stronger ability to stabilize the AlO4-tetrahedral unit in the current melts. Meanwhile, the increase of NBO/T and Λcorr indicated the decrease of DOP in the melt.

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