Thermodynamic Study on MgO Solubility in High-Alumina-Content Slag System

Cheol Min Yoon, Youngjoo Park, Dong Joon Min

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Abstract

In the current study, the MgO solubility in molten slag was measured to clarify the effect of basicity and Al2O3 content on the MgO solubility equilibrating with the spinel solid phase in the CaO-SiO2-Al2O3 system. The MgO solubility decreased with the increasing basicity of the slag. However, the MgO solubility in the spinel equilibrium region exhibited different dependence when compared with the basicity dependence in the MgO equilibrium region. The aforementioned experimental results were quantitatively analyzed using magic-angle spinning (MAS) 27Al nuclear magnetic resonance (NMR) spectroscopy, in which the fraction of Al ions in the slag of spinel equilibrium region was changed to 4, 5, and 6. In addition, the analysis of the degree of Al avoidance modeling indicated that the change in bridging oxygen (BO) linkage species (distinguished into Al-O-Al, Si-O-Si, and Al-O-Si) was based on the Al/Si ratio change. The aforementioned change in BO linkage species led to a change in the MgO solubility with the stability of the alumina. Thus, the spinel equilibrium dissolution mechanism is discussed in detail in terms of the thermodynamic and structural influence in molten slag.

Original languageEnglish
Pages (from-to)2322-2331
Number of pages10
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume49
Issue number5
DOIs
Publication statusPublished - 2018 Oct 1

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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