Effect of FeO in dripping slag on blast furnace hearth drainage

Koki Nishioka, Takayuki Maeda, Masakata Shimizu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Japanese iron and steelmaking industry has to reduce CO2 emission by 10.5% 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 unrevcalcd 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 three-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)986-995
Number of pages10
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume92
Issue number12
DOIs
Publication statusPublished - Jan 1 2006

Fingerprint

hearths
slags
blasts
Blast furnaces
drainage
Slags
Drainage
furnaces
Iron
iron
Steelmaking
deterioration
Deterioration
industries
bricks
distribution (property)
three dimensional models
energy consumption
refractories
Carbon Monoxide

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

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

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 92, No. 12, 01.01.2006, p. 986-995.

Research output: Contribution to journalArticle

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abstract = "Japanese iron and steelmaking industry has to reduce CO2 emission by 10.5{\%} 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 unrevcalcd 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 three-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.",
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