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.
Bibliographical noteFunding Information:
The present study was supported by POSCO , the Brain Korea 21 (BK21) Project of the Division of Humantronics Information Materials , the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy , Republic of Korea. Additional financial support was provided by the Korean National Science Foundation under project number 2010-8-0581 and the Ministry of Knowledge Economy project number 2010-8-0972 .
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry