Optimization of Microwave Reductive Roasting Process of Bauxite Residue

Optimization of Microwave Reductive Roasting Process of Bauxite Residue

In this study, microwave-assisted heating is presented as a suitable method to transform the hematite and goethite contained in bauxite residue into magnetite, wüstite, and metallic iron, with a short processing time. The final target was the production of a sinter with strong magnetic properties, a...

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Main Authors: Chiara Cardenia, Efthimios Balomenos, Dimitrios Panias
Format: Article
Language:English
Published: MDPI AG 2020-08-01
Series:Metals
Subjects:
bauxite residue
red mud
microwave roasting process
iron recovery
Online Access:https://www.mdpi.com/2075-4701/10/8/1083
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spelling doaj-46a0a497a28a49b18e8cbda2ed86bbf02020-11-25T03:42:16ZengMDPI AGMetals2075-47012020-08-01101083108310.3390/met10081083Optimization of Microwave Reductive Roasting Process of Bauxite ResidueChiara Cardenia0Efthimios Balomenos1Dimitrios Panias2School of Mining and Metallurgical Engineering, National Technical University of Athens, Iroon Polythechniou 9, Zografou Campus, 15780 Athens, GreeceSchool of Mining and Metallurgical Engineering, National Technical University of Athens, Iroon Polythechniou 9, Zografou Campus, 15780 Athens, GreeceSchool of Mining and Metallurgical Engineering, National Technical University of Athens, Iroon Polythechniou 9, Zografou Campus, 15780 Athens, GreeceIn this study, microwave-assisted heating is presented as a suitable method to transform the hematite and goethite contained in bauxite residue into magnetite, wüstite, and metallic iron, with a short processing time. The final target was the production of a sinter with strong magnetic properties, allowing the magnetic separation of Fe from the residue. The influence of microwave energy on the sample, the effect of irradiation time, and the carbon/bauxite residue mass ratio (C/BR) were the parameters that have been analyzed to optimize the process. Their optimized combination allowed transforming 79% of the iron present in the sinter into metallic iron. However, hercynite was also formed, and the presence of this mineralogical phase could be considered a possible drawback for its magnetic properties.https://www.mdpi.com/2075-4701/10/8/1083bauxite residuered mudmicrowave roasting processiron recovery
collection DOAJ
language English
format Article
sources DOAJ
author Chiara Cardenia
Efthimios Balomenos
Dimitrios Panias
spellingShingle Chiara Cardenia
Efthimios Balomenos
Dimitrios Panias
Optimization of Microwave Reductive Roasting Process of Bauxite Residue
Metals
bauxite residue
red mud
microwave roasting process
iron recovery
author_facet Chiara Cardenia
Efthimios Balomenos
Dimitrios Panias
author_sort Chiara Cardenia
title Optimization of Microwave Reductive Roasting Process of Bauxite Residue
title_short Optimization of Microwave Reductive Roasting Process of Bauxite Residue
title_full Optimization of Microwave Reductive Roasting Process of Bauxite Residue
title_fullStr Optimization of Microwave Reductive Roasting Process of Bauxite Residue
title_full_unstemmed Optimization of Microwave Reductive Roasting Process of Bauxite Residue
title_sort optimization of microwave reductive roasting process of bauxite residue
publisher MDPI AG
series Metals
issn 2075-4701
publishDate 2020-08-01
description In this study, microwave-assisted heating is presented as a suitable method to transform the hematite and goethite contained in bauxite residue into magnetite, wüstite, and metallic iron, with a short processing time. The final target was the production of a sinter with strong magnetic properties, allowing the magnetic separation of Fe from the residue. The influence of microwave energy on the sample, the effect of irradiation time, and the carbon/bauxite residue mass ratio (C/BR) were the parameters that have been analyzed to optimize the process. Their optimized combination allowed transforming 79% of the iron present in the sinter into metallic iron. However, hercynite was also formed, and the presence of this mineralogical phase could be considered a possible drawback for its magnetic properties.
topic bauxite residue
red mud
microwave roasting process
iron recovery
url https://www.mdpi.com/2075-4701/10/8/1083
work_keys_str_mv AT chiaracardenia optimizationofmicrowavereductiveroastingprocessofbauxiteresidue
AT efthimiosbalomenos optimizationofmicrowavereductiveroastingprocessofbauxiteresidue
AT dimitriospanias optimizationofmicrowavereductiveroastingprocessofbauxiteresidue
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