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Chemical Thermodynamics and Reaction Kinetics of Bayer Process Desilication Read chapter Read first chapter

2024 | OriginalPaper | Chapter

Sustainable Valorization of Bauxite Residue (“Red Mud”): Exploring the Potential of H2 Reduction for Multi-metal Recovery

Authors : Ganesh Pilla, Tobias Hertel, Yiannis Pontikes

Published in: Light Metals 2024

Publisher: Springer Nature Switzerland

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Abstract

This study presents a process for the simultaneous recovery of metals from bauxite residue (BR) at relatively lower temperatures using H2 reduction to achieve zero-waste discharge (minimal waste generation) of BR. The proposed method involves blending BR with NaOH and subjecting it to H2 reduction (using different process parameters), resulting in an intermediate material enriched in magnetite and water-soluble aluminate. Optimal process parameters were determined (temperature of 600 °C, a reduction time of 120 min, 20 wt.% NaOH addition, and a reduction atmosphere of 5 vol.% H2 + 95 vol.% N2 with a 20 L/h flowrate), resulting in satisfactory recoveries of Fe (74.7%, grade = 40%), Al (81.5%), and Na (91.4%). This approach represents a step towards the sustainable valorization of BR, i.e., the efficient recovery of metals (Fe, Al, and Na) along with a non-magnetic fraction (Ca, Si, Ti, Rare earth elements), a precursor for further Sc, Ti recovery, and an additive eventually for building materials.

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previous chapter Research of Cleaner Production of Alumina and Harmless Utilization of Red Mud
next chapter Dealkalinization Effect of Carbon Dioxide in Flue Gas on Bayer Red Mud
Literature
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Metadata
Title
Sustainable Valorization of Bauxite Residue (“Red Mud”): Exploring the Potential of H2 Reduction for Multi-metal Recovery
Authors
Ganesh Pilla
Tobias Hertel
Yiannis Pontikes
Copyright Year
2024
Book
Light Metals 2024

Print ISBN: 978-3-031-50307-8

Electronic ISBN: 978-3-031-50308-5

Copyright Year: 2024

DOI
https://doi.org/10.1007/978-3-031-50308-5_13

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