Kinetics and Mechanisms of Dolime Dissolution in Steelmaking Slag

The kinetics of dolime dissolution containing 20 and 50 pct of magnesium oxide in steelmaking slags has been studied in a high-temperature experiment. The dissolution tests were carried out under static conditions at temperatures of between 1573 K and 1873 K (1300 °C to 1600 °C). Cylindrical samples...

Full description

Saved in:
Bibliographic Details
Published inMetallurgical and materials transactions. B, Process metallurgy and materials processing science Vol. 50; no. 3; pp. 1269 - 1276
Main Authors Cheremisina, Elizaveta, Schenk, Johannes, Nocke, Ludwig, Paul, Alexander, Wimmer, Gerald
Format Journal Article
LanguageEnglish
Published New York Springer US 15.06.2019
Springer Nature B.V
Subjects
ACTIVATION ENERGY
Basicity
CALCIUM OXIDES
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coefficients
CONCENTRATION RATIO
CYLINDRICAL CONFIGURATION
Dependence
DIFFUSION
Diffusion rate
DISSOLUTION
High temperature
KINETICS
Magnesium oxide
MAGNESIUM OXIDES
MASS TRANSFER
MATERIALS SCIENCE
Mathematical analysis
Metallic Materials
Nanotechnology
Slag
SLAGS
SOLUBILITY
Steel making
STEELS
Structural Materials
Superconductors (materials)
Surfaces and Interfaces
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMICS
Thin Films
Online AccessGet full text

Cover

More Information
Summary:The kinetics of dolime dissolution containing 20 and 50 pct of magnesium oxide in steelmaking slags has been studied in a high-temperature experiment. The dissolution tests were carried out under static conditions at temperatures of between 1573 K and 1873 K (1300 °C to 1600 °C). Cylindrical samples of dolime were introduced into pre-melted slag at predetermined time intervals. The changes in mass and geometrical parameters of the samples, as well as CaO and MgO concentrations in the melt, were determined to calculate mass transfer and diffusion coefficients. The results revealed that the rate-limiting step in the process of dolime dissolution is diffusion. The increase in MgO content in the initial sample caused a drop in dolime dissolution rate and diffusion coefficients. The prediction of MgO solubility in steel slag, as well as the effect of slag basicity, was carried out using the thermodynamic software FactSage 7.1. In addition, the activation energy of diffusion has been calculated using the dependence of the logarithm of diffusion coefficients on the inverse temperature.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-019-01560-w