Softening, Melting, and Permeation Phenomena of CaO–FeO–SiO₂ Oxide on a Coke Bed

• Ueda Shigeru

  Institute of Multidisciplinary Research Advanced Material, Tohoku University

• Kon Tatsuya

  Institute of Multidisciplinary Research Advanced Material, Tohoku University

• Miki Takahiro

  School of Engineering, Tohoku University

• Kim Sun-Joong

  Institute of Multidisciplinary Research Advanced Material, Tohoku University

• Nogami Hiroshi

  Institute of Multidisciplinary Research Advanced Material, Tohoku University

Bibliographic Information

Other Title

• Softening, melting, and permeation phenomena of CaO–FeO–SiO2 oxide on a coke bed

Abstract

For the low carbon operation of blast furnace, it is necessary to maintain the gas permeability in the furnace at low coke rate. The pressure drop in the cohesive zone of the blast furnace is significantly high, and the gas permeability of the cohesive zone has an influence on the productivity of the iron-making process. The gas permeability increases as the thickness of the cohesive zone decreases. The present study aimed to decrease the thickness of the cohesive zone by achieving a higher softening temperature and a lower temperature for the dripping of the sinter ore. The softening, melting, and permeation processes of CaO–FeO–SiO₂ oxide on a coke bed was investigated. The change in the shape of the oxide tablet, the formation of the liquid droplet, and its permeation into the coke bed were observed with increasing temperature in several CO/CO₂ atmospheres. Softening of the oxide was observed at a temperature that was slightly above the solidus temperature. The deformation of the oxide tablets was strongly affected by the liquid phase ratio. Furthermore, there was no relationship between the temperature of permeation and the melting of the oxide tablet. The permeation of the oxide melt into the coke bed is dependent on the wettability between them.

Journal

• ISIJ International

  ISIJ International 55 (10), 2098-2104, 2015

  The Iron and Steel Institute of Japan

Keywords

• sinter
• cohesive zone
• softening
• melting
• molten slag
• molten iron
• wettability
• dripping zone
• blast furnace

Details

• CRID: 1390001206487922176
• NII Article ID: 130005105381
• DOI: 10.2355/isijinternational.isijint-2015-269
• ISSN: 13475460
• ISSN: 09151559
• Web Site: https://www.jstage.jst.go.jp/article/isijinternational/55/10/55_ISIJINT-2015-269/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed