TY - JOUR
T1 - Influence of basicity and FeO content on viscosity of blast furnace type slags containing FeO
AU - Lee, Young Seok
AU - Min, Dong Joon
AU - Jung, Sung Mo
AU - Yi, Sang Ho
PY - 2004
Y1 - 2004
N2 - The viscosities of CaO-SiO2-Al2O3-MgO-FeO slags were measured under conditions of C/S=1.15-1.6, 10-13 mass% Al 2O3, 5-10 mass% MgO and 0-20 mass% FeO. Slag viscosity decreased with increasing FeO content at a fixed basicity (CaO/SiO2) of slag. Slag viscosity at low FeO (<7.5 mass% FeO) exhibited a minimum value by increasing MgO content in slag. Viscosity decreased with increasing slag basicity up to 1.3 while it increased as slag basicity increased from 1.3 to 1.5. It was proposed that the driving force for the decrease of slag viscosity would be an increase in depolymerization of silicate network at C/S≤1.3, while the viscous behavior at C/S>1.3 would be increased with increasing the chemical potential of primary solid phase e.g. dicalcium silicate. A thermodynamic approach for the activity of primary solid phase in molten slags resulted in a reasonable relationship between viscosity and slag components. Therefore, it was confirmed that slag viscosity in basic slags (C/S>1.3) could be estimated by the chemical potential of dicalcium silicate.
AB - The viscosities of CaO-SiO2-Al2O3-MgO-FeO slags were measured under conditions of C/S=1.15-1.6, 10-13 mass% Al 2O3, 5-10 mass% MgO and 0-20 mass% FeO. Slag viscosity decreased with increasing FeO content at a fixed basicity (CaO/SiO2) of slag. Slag viscosity at low FeO (<7.5 mass% FeO) exhibited a minimum value by increasing MgO content in slag. Viscosity decreased with increasing slag basicity up to 1.3 while it increased as slag basicity increased from 1.3 to 1.5. It was proposed that the driving force for the decrease of slag viscosity would be an increase in depolymerization of silicate network at C/S≤1.3, while the viscous behavior at C/S>1.3 would be increased with increasing the chemical potential of primary solid phase e.g. dicalcium silicate. A thermodynamic approach for the activity of primary solid phase in molten slags resulted in a reasonable relationship between viscosity and slag components. Therefore, it was confirmed that slag viscosity in basic slags (C/S>1.3) could be estimated by the chemical potential of dicalcium silicate.
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U2 - 10.2355/isijinternational.44.1283
DO - 10.2355/isijinternational.44.1283
M3 - Article
AN - SCOPUS:6344243420
VL - 44
SP - 1283
EP - 1290
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 8
ER -