Influence of MgO and Al2O3 contents on viscosity of blast furnace type slags containing FeO

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

Research output: Contribution to journalArticlepeer-review

150 Citations (Scopus)


The viscosities of CaO-SiO2-Al2O3-MgO-FeO slag were measured under conditions of C/S=1.35-1.45, 10-18 mass% Al 2O3, 3.5-10 mass% MgO and 5 mass% FeO. The bosh slag with 10 mass% Al2O3 content had the lowest melting temperature and the widest solid-liquid coexisting region at about 5 mass% MgO, while in case of 14 mass% Al2O3, an increase in a MgO content from about 3.5 to 10 mass% raised the melting point of bosh slag. The viscosity of bosh slag also exhibited a minimum value at about 7 mass% MgO at temperatures above 1 723 K. However, it was not significantly changed with varying MgO content. On the hand, with increasing Al2O3 content, the viscosity of bosh slag increased at a fixed C/S and MgO content. Based on the melting temperature and the behavior of viscosity at a fixed temperature, it could be proposed that the MgO and Al2O3 contents in bosh slag should be maintained around 5 and 10 mass%, respectively, for high pulverized-coal ratio (PCR) and low slag volume operations in blast furnace.

Original languageEnglish
Pages (from-to)1291-1297
Number of pages7
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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