Effects of MgO/Al2O3 ratio on viscous behaviors and structures of MgO-Al2O3-TiO2-CaO-SiO2 slag systems with high TiO2 content and low CaO/SiO2 ratio
(1. School of Metallurgy, Northeastern University, Shenyang 110819, China;
2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China)
2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China)
Abstract: The effects of MgO/Al2O3 ratio on the viscous behaviors of MgO-Al2O3-TiO2-CaO-SiO2 systems were investigated by the rotating cylinder method. Raman spectroscopy was used to analyze the structural characteristics of slag and Factsage 7.0 was adopted to demonstrate the liquidus temperature of slag. The results show that the viscosity and activation energy for viscous flow decrease when the MgO/Al2O3 ratio increases from 0.82 to 1.36. The break point temperature and liquidus temperature of slag initially decrease and subsequently increase. The complex viscous structures are gradually depolymerized to simple structural units. In conclusion, with the increase of MgO/Al2O3 ratio, the degree of polymerization of slag decreases, which improves the fluidity of slag. The variations of liquidus temperature of slag lead to the same changes of break point temperature.
Key words: vanadium-bearing titanomagnetite; titanium-bearing slag; viscous behavior; degree of polymerization of slag; MgO/Al2O3 ratio