Surface kinetics of nitrogen dissolution and its correlation to the slag structure in the CaO - SiO2, CaO - Al2O3, and CaO - SiO2 - Al2O3 slag system

Seung Min Han, Jin Gyun Park, Il Sohn

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Abstract

The kinetics of nitrogen dissolution into molten slag at 1873 K was investigated by an isotope exchange technique. Rate constants were correlated with the molten slag structure obtained from FT-IR spectra. The rate constant in the CaO - SiO2 binary system showed a maximum value at a specific slag composition followed by a decrease in the rate due to excess O2- blocking the surface sites for nitrogen adsorption. The rate constant in the CaO - Al2O3 binary system was comparatively constant within the experimental range of 45 mass% to 60 mass%. The rate constant in the CaO - SiO2 - Al2O3 ternary slag system was measured within the boundary of the liquidus line and showed a close correlation with the slag structure. Furthermore, the rate constant in the CaO - SiO 2 - Al2O3 ternary system was found to be significantly higher compared to the binary system due to the correlated effect of lower binding energies of the Al - O bonds and the increased number of reaction sites available when smaller Si - O tetrahedral were simultaneously present with Al - O bonds.

Original languageEnglish
Pages (from-to)2868-2875
Number of pages8
JournalJournal of Non-Crystalline Solids
Volume357
Issue number15
DOIs
Publication statusPublished - 2011 Jul 15

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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