Novel Approach to Studying Influences of Na₂O and K₂O Additions on Viscosity and Thermodynamic Properties of BF Slags

Abstract:

The present work calculated the heat capacity, enthalpy change, and slag temperature of CaO–MgO–Al₂O₃–SiO₂ slags after adding Na₂O or K₂O, and investigated the influences of Na₂O and K₂O on the slag viscosity under given temperatures and heat quantities. It was found that the slag viscosity decreases with the addition of Na₂O and tends to increase with K₂O additions at the same temperature. The heat capacity of the slag increases, while the enthalpy change decreases obviously with the increasing addition of Na₂O or K₂O. Under the constant heat quantity, an increase in content of Na₂O or K₂O of the slag leads to an appreciable increase in slag temperature, whereas the viscosity decreases significantly. Besides, the Na₂O or K₂O additions also help to stabilize the slag fluidity and lower energy consumption of blast furnace.