Effect of FeO in dripping slag on drainage ability of slag

Koki Nishioka, Takayuki Maeda, Masakata Shimizu

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Japanese iron and steelmaking industry has to reduce CO2 emission by 11.5% in 2010 relative to the level of emissions in 1990. Stable blast furnace operation is required to reduce energy consumption and CO 2 emission in iron and steelmaking industry. For the stable blast furnace operation, precise controlled drainage is one of the important factors. However, there are many unrevealed phenomena in the hearth to perform the stable operation. Therefore, in this work, the effect of iron and slag dripping pattern, FeO concentration in the dripping slag on the iron and slag surfaces, thermal properties of refractory and brick on drainage temperature, temperature distribution in the hearth, temporal variation of iron and slag drainage rates and interfaces shapes were investigated by using tree-dimensional mathematical model. The results indicate that more than 2 mass% FeO in dripping slag will cause deterioration of slag drainage ability due to high slag viscosity around tapholes. Continuous monitoring of FeO concentration in the tapping slag is effective to prevent deterioration of slag drainage ability. The trends of the other side of tapping taphole temperature were varied dramatically according with FeO concentration in the dripping slag. Even in the case of 0 mass% FeO in the dripping slag, there is a solidified slag near the hearth wall except around the tapholes. A peripheral distribution pattern will result in a stable drainage. Slag, which dripped on near the other side of the tapping taphole, stays around the taphole, and does not drain from the tapping taphole located opposite side.

Original languageEnglish
Pages (from-to)1506-1514
Number of pages9
Journalisij international
Volume45
Issue number10
DOIs
Publication statusPublished - Dec 27 2005

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Slags
Drainage
Iron
Steelmaking
Blast furnaces
Deterioration
Carbon Monoxide
Brick
Refractory materials
Industry
Temperature distribution
Thermodynamic properties
Energy utilization
Viscosity
Mathematical models
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Effect of FeO in dripping slag on drainage ability of slag. / Nishioka, Koki; Maeda, Takayuki; Shimizu, Masakata.

In: isij international, Vol. 45, No. 10, 27.12.2005, p. 1506-1514.

Research output: Contribution to journalArticle

Nishioka, Koki ; Maeda, Takayuki ; Shimizu, Masakata. / Effect of FeO in dripping slag on drainage ability of slag. In: isij international. 2005 ; Vol. 45, No. 10. pp. 1506-1514.
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