Effect of FeO and Al 2O 3 on the MgO solubility in CaO-SiO 2-FeO-Al 2O 3-MgO slag system at 1823 K

Young Jae Kim, Dong Joon Min

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Abstract

The MgO solubility in CaO-SiO 2-FeO-Al 2O 3-MgO quinary slag system at 1823 K was measured to evaluate the effect of FeO and Al 2O 3 on the MgO solubility. It was found that the MgO solubility was decreased with higher optical basicity, FeO concentration, and increased with higher Al 2O 3 concentration. The MgO solubility was affected by activity coefficient of Mg 2+Mg2). Increase of the activity coefficient of Mg 2+Mg2) with higher FeO or lower Al 2O 3 decreased the MgO solubility. The increment in MgO solubility is remarkably reduced beyond a critical X Al2O3/(X Al2O3 + X FeO) ratio. The significant decrease of the increment of MgO solubility is caused by the change of the molten slag structure. The excess stability function of Al 2O 3 and the Fourier transform infrared (FT-IR) analysis were applied to indirectly verify the existence of the spinel structure in the CaO-SiO 2-FeO-Al 2O 3-MgO slag system.

Original languageEnglish
Pages (from-to)852-860
Number of pages9
JournalSteel Research International
Volume83
Issue number9
DOIs
Publication statusPublished - 2012 Sep 1

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All Science Journal Classification (ASJC) codes

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

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