Influence of atmosphere and basicity on softening and melting behaviors of the CaO-FeO-SiO2-Al2O3-MgO System

Shigeru Ueda, Takahiro Miki, Sun Joong Kim, Xu Gao, Hiroshi Nogami, Shin Ya Kitamura

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this study, we analyze the softening and melting behaviors of the CaO-FeO-SiO2-Al2O3-MgO system for improving gas permeability in a blast furnace. The temperature of the oxide is increased to 1 723 or 1 773 K in a CO/CO2 mixture; the softening and melting temperatures and the temperature of penetration into the coke bed are measured. Because the CO/CO2 ratio in the atmosphere influences the stable state of iron or iron oxide, the softening and melting behaviors are investigated for numerous CO/CO2 ratios. We observe that the reduction of the sample progresses in an atmosphere with a high CO/CO2 ratio, and thus, the softening temperature increases. Because the composition of the oxidation phase influences the solidus and liquidus temperatures, the influence of basicity on the phenomena is also investigated, and a method of reducing the difference between the softening and dripping temperatures is discussed.

Original languageEnglish
Pages (from-to)1380-1388
Number of pages9
JournalIsij International
Volume60
Issue number7
DOIs
Publication statusPublished - 2020

Keywords

  • Blast furnace
  • Coke bed
  • Gas permeability
  • Iron ore
  • Melting
  • Softening

ASJC Scopus subject areas

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

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