Investigation of the Effects of Al2O3 Content and Cooling Rate on Crystallization in Fe2O3–CaO–Al2O3 System Using In Situ Confocal Laser Scanning Microscopy

Tae Jun Park, Joon Sung Choi, Dong Joon Min

Research output: Contribution to journalArticle

Abstract

Sinter is a major Fe source, that is, used extensively in blast furnace processes worldwide. The chemical and physical properties of sinter are crucial factors that affect the operating stability of blast furnaces. The quality of sinter is largely determined by the phase fraction of the silico-ferrite of calcium and aluminum (SFCA), which is a low-melting-point bonding phase formed during sintering. Calcium ferrite (CF)-containing alumina is known to be the structural basis for SFCA and SFCA-1, and provides basic information regarding the influence of Al2O3 on the formation of CF solid solutions. In this work, experiments are conducted to investigate the crystallization behaviors of an Fe2O3–CaO–Al2O3 system based on its Al2O3 content and cooling rate. The effects of Al2O3 additions are used to analyze changes in the phase formation temperature, phase ratio, and rate of decrease by using an in situ confocal laser-scanning microscope, optical microscope, electron probe micro analyzer, and horizontal tube furnace. The temperatures at which the primary phase forms for various Al2O3 contents and cooling rates differ from the equilibrium temperatures, and the phase-formation temperature ranges vary with the cooling rate.

Original languageEnglish
Article number1900001
JournalSteel Research International
Volume90
Issue number7
DOIs
Publication statusPublished - 2019 Jul 1

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Crystallization
Ferrite
calcium
ferrites
Calcium
Microscopic examination
crystallization
microscopy
Cooling
Scanning
cooling
Aluminum
scanning
Lasers
furnaces
lasers
blasts
Blast furnaces
aluminum
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Sinter is a major Fe source, that is, used extensively in blast furnace processes worldwide. The chemical and physical properties of sinter are crucial factors that affect the operating stability of blast furnaces. The quality of sinter is largely determined by the phase fraction of the silico-ferrite of calcium and aluminum (SFCA), which is a low-melting-point bonding phase formed during sintering. Calcium ferrite (CF)-containing alumina is known to be the structural basis for SFCA and SFCA-1, and provides basic information regarding the influence of Al2O3 on the formation of CF solid solutions. In this work, experiments are conducted to investigate the crystallization behaviors of an Fe2O3–CaO–Al2O3 system based on its Al2O3 content and cooling rate. The effects of Al2O3 additions are used to analyze changes in the phase formation temperature, phase ratio, and rate of decrease by using an in situ confocal laser-scanning microscope, optical microscope, electron probe micro analyzer, and horizontal tube furnace. The temperatures at which the primary phase forms for various Al2O3 contents and cooling rates differ from the equilibrium temperatures, and the phase-formation temperature ranges vary with the cooling rate.",
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AU - Park, Tae Jun

AU - Choi, Joon Sung

AU - Min, Dong Joon

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AB - Sinter is a major Fe source, that is, used extensively in blast furnace processes worldwide. The chemical and physical properties of sinter are crucial factors that affect the operating stability of blast furnaces. The quality of sinter is largely determined by the phase fraction of the silico-ferrite of calcium and aluminum (SFCA), which is a low-melting-point bonding phase formed during sintering. Calcium ferrite (CF)-containing alumina is known to be the structural basis for SFCA and SFCA-1, and provides basic information regarding the influence of Al2O3 on the formation of CF solid solutions. In this work, experiments are conducted to investigate the crystallization behaviors of an Fe2O3–CaO–Al2O3 system based on its Al2O3 content and cooling rate. The effects of Al2O3 additions are used to analyze changes in the phase formation temperature, phase ratio, and rate of decrease by using an in situ confocal laser-scanning microscope, optical microscope, electron probe micro analyzer, and horizontal tube furnace. The temperatures at which the primary phase forms for various Al2O3 contents and cooling rates differ from the equilibrium temperatures, and the phase-formation temperature ranges vary with the cooling rate.

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