The effect of MgO on the viscosity of the CaO-SiO2-20 wt%Al 2O3-MgO slag system

Hyuk Kim, Wan Ho Kim, Il Sohn, Dong Joon Min

Research output: Contribution to journalArticle

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Abstract

The viscosities of CaO-SiO2-20 wt%Al2O 3-MgO slags (CaO/SiO2=1.0-1.2,wt%MgO=5-13) were measured to estimate the effect of MgO on the viscous behaviour at elevated temperatures. The slag viscosity at 1773K decreased with increasing MgO contents, which was typical of a basic oxide component at relatively low basicity (CaO/SiO 2) of 1.0. The FT-IR spectroscopic analysis of the slag structure seems to verify this behaviour. However, an unexpected contradiction with the temperature dependence was observed above 10wt%MgO and above CaO/SiO2 of 1.2. Although the apparent activation energy was expected to decrease with additions of the basic oxide component MgO, the apparent activation energy increased. This unexpected behaviour seems to be related to the change in the primary phase field correlating to the phase diagram corresponding to the slag composition. Therefore, in order to understand the viscosity at both high Al2O3 and MgO, not only should the typical depolymerization of the slag structure with high MgO content be considered but also the primary phases of which the molten slag originates

Original languageEnglish
Pages (from-to)261-264
Number of pages4
JournalSteel Research International
Volume81
Issue number4
DOIs
Publication statusPublished - 2010 Apr 1

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slags
Slags
Viscosity
viscosity
Oxides
Activation energy
activation energy
depolymerization
Depolymerization
Spectroscopic analysis
oxides
spectroscopic analysis
Alkalinity
Phase diagrams
Molten materials
phase diagrams
Temperature
temperature dependence
estimates
Chemical analysis

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "The effect of MgO on the viscosity of the CaO-SiO2-20 wt{\%}Al 2O3-MgO slag system",
abstract = "The viscosities of CaO-SiO2-20 wt{\%}Al2O 3-MgO slags (CaO/SiO2=1.0-1.2,wt{\%}MgO=5-13) were measured to estimate the effect of MgO on the viscous behaviour at elevated temperatures. The slag viscosity at 1773K decreased with increasing MgO contents, which was typical of a basic oxide component at relatively low basicity (CaO/SiO 2) of 1.0. The FT-IR spectroscopic analysis of the slag structure seems to verify this behaviour. However, an unexpected contradiction with the temperature dependence was observed above 10wt{\%}MgO and above CaO/SiO2 of 1.2. Although the apparent activation energy was expected to decrease with additions of the basic oxide component MgO, the apparent activation energy increased. This unexpected behaviour seems to be related to the change in the primary phase field correlating to the phase diagram corresponding to the slag composition. Therefore, in order to understand the viscosity at both high Al2O3 and MgO, not only should the typical depolymerization of the slag structure with high MgO content be considered but also the primary phases of which the molten slag originates",
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The effect of MgO on the viscosity of the CaO-SiO2-20 wt%Al 2O3-MgO slag system. / Kim, Hyuk; Kim, Wan Ho; Sohn, Il; Min, Dong Joon.

In: Steel Research International, Vol. 81, No. 4, 01.04.2010, p. 261-264.

Research output: Contribution to journalArticle

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