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The melting temperature and viscosity of CaO-Al 2 O 3 -10 mass% SiO 2  based slag system with various concentrations of Ce 2 O 3  have been studied using the melting point detector and the rotating crucible viscometer. And X-ray diffraction analysis has been used for phase identification. The results show that cerium is stable in Ce 3+  state existing mainly as CeAlO 3  and Ce 4.67 (SiO 4 ) 3 O phase in slags and CeAlO 3  phase appears in green color. The melting temperature gently decreases with Ce 2 O 3  additions in 1.57 of CaO/Al 2 O 3 . Moreover, the melting temperature increases first and then decreases with the increasing of CaO/Al 2 O 3  from 1.17 to 1.52 at 4.47 mass% Ce 2 O 3 . In addition, at 1.57 of CaO/Al 2 O 3 , the viscosity increases at the beginning and then decreases with the increasing Ce 2 O 3  content from 4.39 to 11.48 mass%. Furthermore, at 4.47 mass% Ce 2 O 3 , the viscosity decreases at the first and then increases with the increasing CaO/Al 2 O 3  from 1.17 to 1.52. Meanwhile, from the slopes of the Arrhenius relationship for viscosity, the activation energy range of viscous flow is from 179.07 to 433.70 kJ/mol. On the basis of these results, slag composition of 45.64 mass% CaO-39.02 mass% Al 2 O 3 -10.73 mass% SiO 2 -3.83 mass% Ce 2 O 3  is melting temperature of 1361 °C and viscosity of 0.398 Pa·s (1500 °C), which has superiority and is more suitable for the actual refining process.

Effect of Ce 2 O 3 and CaO/Al 2 O 3 on the Phase, Melting Temperature and Viscosity of CaO-Al 2 O 3 -10 Mass% SiO 2 Based Slags