High Temperature Thermodynamics and Applications of Rare Earth Oxides and Sulphides in Ferrous Metallurgy
- 1 March 1992
- journal article
- research article
- Published by Taylor & Francis in Mineral Processing and Extractive Metallurgy Review
- Vol. 10 (1) , 307-323
- https://doi.org/10.1080/08827509208914093
Abstract
The thermodynamic behavior of the rare earth metals lanthanum and cerium in liquid and steel as predicted by the high temperature (1400-1600°C) thermochemistry of their oxides, oxysulphides and sulphides, is compared to experimentally-determined thermodynamic behavior reported in the literature. The comparison of experimental results includes data from high temperature equilibrium studies and electrochemical cells. Phase stability diagrams, constructed in terms of the Henrian activities of oxygen and sulphur, are used to compare thermodynamic data bases and to determine some of the applications of lanthanum and cerium in ferrous metallurgy. M-S-O (M-Ce, La. Ca and Mg) phase stability diagrams arc used in the comparison of hot-metal desulphurization processes, and the control of graphite morphology in the production of nodular and compacted graphite iron.Keywords
This publication has 13 references indexed in Scilit:
- Thermodynamics of lanthanide elements in the presence of sulfur in iron-base metallic solutionsInorganica Chimica Acta, 1987
- Standard free energies of formation of rare earth sesquisulphidesJournal of Materials Science, 1987
- Gibbs energies of formation of rare earth oxysulfidesMetallurgical Transactions B, 1987
- Equilibria between rare earth elements and sulfur in molten ironMetallurgical Transactions B, 1985
- Thermodynamics of rare earth elements in liquid ironJournal of the Less Common Metals, 1985
- Thermodynamics of the Ca-S-O, Mg-S-O, and La-S-O systems at high temperaturesMetallurgical Transactions B, 1985
- Thermodynamics of high temperature oxidation of La2O2S and Nd2O2S at high sulphur partial pressureJournal of Materials Science Letters, 1984
- Determination of the standard free energies of formation of Ce2O2S and Y2O2S at high temperaturesJournal of the Less Common Metals, 1984
- The free energy of formation of Ce2O2S and the nonstoichiometry of cerium oxidesMetallurgical Transactions B, 1979
- Thermodynamics of rare earths in steelmakingMetallurgical Transactions B, 1976