Influence of basicity and FeO content on viscosity of blast furnace type slags containing FeO

Young Seok Lee, Dong Joon Min, Sung Mo Jung, Sang Ho Yi

Research output: Contribution to journalArticlepeer-review

138 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1283-1290
Number of pages8
JournalISIJ International
Issue number8
Publication statusPublished - 2004

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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