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CFB Alumina Calciners—New and Future Generation Opportunities for Green Field Refineries Read chapter Read first chapter

2017 | OriginalPaper | Chapter

Low Temperature Reduction of Hematite in Red-Mud to Magnetite

Authors : Sumedh Gostu, Brajendra Mishra, Gerard P. Martins

Published in: Light Metals 2017

Publisher: 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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previous chapter Application of Tricalcium Aluminate Instead of Lime for the Recovery of Aluminum in Middle-Low Grade Bauxite in Calcification-Carbonization Process
next chapter Recovery of Iron-, Titanium-Bearing Constituents from Bauxite Ore Residue via Magnetic Separation Followed by Sulfuric Acid Leaching
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Metadata
Title
Low Temperature Reduction of Hematite in Red-Mud to Magnetite
Authors
Sumedh Gostu
Brajendra Mishra
Gerard P. Martins
Copyright Year
2017
Book
Light Metals 2017

Print ISBN: 978-3-319-51540-3

Electronic ISBN: 978-3-319-51541-0

Copyright Year: 2017

DOI
https://doi.org/10.1007/978-3-319-51541-0_10

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