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2017 | OriginalPaper | Buchkapitel

Low Temperature Reduction of Hematite in Red-Mud to Magnetite

verfasst von : Sumedh Gostu, Brajendra Mishra, Gerard P. Martins

Erschienen in: Light Metals 2017

Verlag: Springer International Publishing

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Abstract

Red-mud, the residue generated from the Bayers processing of bauxite ore in Jamaica was subjected to a low temperature reduction process. Hematite (~60 m%) was reduced to magnetite employing a gas based mixture of CO, CO2 and N2 as a diluent. Extensive thermodynamic study was conducted to identify the stability region for magnetite. ‘Optimal conditions’ for the gas-phase reduction were determined to be: a processing temperature of 540 °C ± 10 °C, partial pressures CO(g) and CO2(g) each of 0.070 atm (bar) ± 0.001 atm (bar)/inert diluent-gas: N2(g), for a conversion-time of 30 min. Mathematical model for reduction based on unidirectional diffusion is also formulated in this paper.

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Metadaten
Titel
Low Temperature Reduction of Hematite in Red-Mud to Magnetite
verfasst von
Sumedh Gostu
Brajendra Mishra
Gerard P. Martins
Copyright-Jahr
2017
DOI
https://doi.org/10.1007/978-3-319-51541-0_10

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