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Metallurgical and Materials Transactions B

Erschienen in:

01.10.2008 | Communication

Kinetics of Spinel Formation and Growth during Dissolution of MgO in CaO-Al₂O₃-SiO₂ Slag

verfasst von: S.A. Nightingale, B.J. Monaghan

Erschienen in: Metallurgical and Materials Transactions B | Ausgabe 5/2008

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Abstract

The formation and growth of MgAl₂O₄spinel crystals on a single-crystal MgO substrate submerged in a 40 pct CaO, 40 pct SiO₂, and 20 pct Al₂O₃slag were directly observed using high-temperature microscopy. This showed that the crystals initially form on the MgO surface, but may break off and be carried out into the liquid slag. Still pictures extracted from digitally recorded images were used to measure the size of these crystals at 1420 °C, 1440 °C, and 1460 °C as a function of time. Growth of the crystals was found to follow the parabolic rate law, with rates increasing with temperature. An activation energy of 564 kJ mol⁻¹was estimated from the experimental data. This was found to be comparable with previously published results from different types of experiments on spinel formation.

Vorheriger Artikel Thermodynamic Considerations in Reduction of Nickeliferrous Laterite by Methane

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MTDATA is a commercial thermodynamic software package developed at the National Physical Laboratory in the United Kingdom, which is able calculate complex multicomponent phase equilibria in gas-liquid-solid systems. It uses a Gibbs energy minimization routine to establish the thermodynamic equilibrium of a defined system.

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Titel: Kinetics of Spinel Formation and Growth during Dissolution of MgO in CaO-Al2O3-SiO2 Slag
verfasst von: S.A. Nightingale
B.J. Monaghan
Publikationsdatum: 01.10.2008
Verlag: Springer US
Erschienen in: Metallurgical and Materials Transactions B / Ausgabe 5/2008
Print ISSN: 1073-5615
Elektronische ISSN: 1543-1916
DOI: https://doi.org/10.1007/s11663-008-9186-y

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