A kinetic study on the carbonation of steelmaking slags

Jong Yeong Yu, Sung Suk Jung, Il Sohn

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Carbonation of a synthesized CaO-Al2O3-MgO-SiO2 ladle refining slag has been kinetically studied using a thermo-gravimetric analyzer (TGA). The effects of extended basicity (CaO/Al2O3), temperature, and the crystal phase ratio were considered. The carbonation ratio and the initial reaction rate increased with basicity. However, for the same basicity of the slag, a decreasing crystal phase ratio seemed to accelerate the carbonation reaction due to the higher reactivity of the O2- ions within the slag. The carbonation ratio and the initial reaction rate were also found to increase with temperature in the range between 973 K and 1073 K, where the temperature effect was clearly observed at the onset of the reaction. Parameters were set to identify the carbonation mechanism and their values were calculated via regression analysis. The activation energy for carbonation was calculated to be 129.9 kJ/mol at C/A=1.0 and 109.0 kJ/mol at C/A=1.2.

Original languageEnglish
Pages (from-to)35-42
Number of pages8
JournalJournal of Korean Institute of Metals and Materials
Volume53
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

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Carbonation
Steelmaking
Slags
Kinetics
Reaction Rate
Alkalinity
Crystal
Temperature Effect
Reaction rates
SiO2
Activation Energy
Reactivity
Regression Analysis
Accelerate
Crystals
Regression analysis
Thermal effects
Refining
Activation energy
Range of data

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Modelling and Simulation
  • Surfaces, Coatings and Films
  • Metals and Alloys

Cite this

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A kinetic study on the carbonation of steelmaking slags. / Yu, Jong Yeong; Jung, Sung Suk; Sohn, Il.

In: Journal of Korean Institute of Metals and Materials, Vol. 53, No. 1, 01.01.2015, p. 35-42.

Research output: Contribution to journalArticle

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AB - Carbonation of a synthesized CaO-Al2O3-MgO-SiO2 ladle refining slag has been kinetically studied using a thermo-gravimetric analyzer (TGA). The effects of extended basicity (CaO/Al2O3), temperature, and the crystal phase ratio were considered. The carbonation ratio and the initial reaction rate increased with basicity. However, for the same basicity of the slag, a decreasing crystal phase ratio seemed to accelerate the carbonation reaction due to the higher reactivity of the O2- ions within the slag. The carbonation ratio and the initial reaction rate were also found to increase with temperature in the range between 973 K and 1073 K, where the temperature effect was clearly observed at the onset of the reaction. Parameters were set to identify the carbonation mechanism and their values were calculated via regression analysis. The activation energy for carbonation was calculated to be 129.9 kJ/mol at C/A=1.0 and 109.0 kJ/mol at C/A=1.2.

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