A Combined Soda Sintering and Microwave Reductive Roasting Process of Bauxite Residue for Iron Recovery
In this study an integrated process is presented as a suitable method to transform Fe<sup>3+</sup> oxides present in bauxite residue into magnetic oxides and metallic iron through a microwave roasting reduction, avoiding the formation of hercynite (FeAl<sub>2</sub>O<sub>...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-02-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/2/222 |
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| author | Chiara Cardenia Efthymios Balomenos Pritii Wai Yin Tam Dimitrios Panias |
| author_facet | Chiara Cardenia Efthymios Balomenos Pritii Wai Yin Tam Dimitrios Panias |
| author_sort | Chiara Cardenia |
| collection | DOAJ |
| description | In this study an integrated process is presented as a suitable method to transform Fe<sup>3+</sup> oxides present in bauxite residue into magnetic oxides and metallic iron through a microwave roasting reduction, avoiding the formation of hercynite (FeAl<sub>2</sub>O<sub>4</sub>). In the first step, all the alumina phases were transformed into sodium aluminates by adding sodium carbonate as a flux to BR and then leached out through alkali-leaching to recover alumina. Subsequently, the leaching residue was mixed with carbon and roasted by using a microwave furnace at the optimum conditions. The iron oxide present in the sinter was converted into metallic iron (98%). In addition, hercynite was not detected. The produced cinder was subjected to a wet high intensity magnetic separation process to separate iron from the other elements. |
| first_indexed | 2024-03-09T00:37:08Z |
| format | Article |
| id | doaj.art-1246394d384f4d7589e0f4f7fa800074 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T00:37:08Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-1246394d384f4d7589e0f4f7fa8000742023-12-11T18:02:26ZengMDPI AGMinerals2075-163X2021-02-0111222210.3390/min11020222A Combined Soda Sintering and Microwave Reductive Roasting Process of Bauxite Residue for Iron RecoveryChiara Cardenia0Efthymios Balomenos1Pritii Wai Yin Tam2Dimitrios Panias3Zografou Campus, School of Mining and Metallurgical Engineering, National Technical University of Athens, Iroon Polythechniou 9, 15780 Athens, GreeceZografou Campus, School of Mining and Metallurgical Engineering, National Technical University of Athens, Iroon Polythechniou 9, 15780 Athens, GreeceZografou Campus, School of Mining and Metallurgical Engineering, National Technical University of Athens, Iroon Polythechniou 9, 15780 Athens, GreeceZografou Campus, School of Mining and Metallurgical Engineering, National Technical University of Athens, Iroon Polythechniou 9, 15780 Athens, GreeceIn this study an integrated process is presented as a suitable method to transform Fe<sup>3+</sup> oxides present in bauxite residue into magnetic oxides and metallic iron through a microwave roasting reduction, avoiding the formation of hercynite (FeAl<sub>2</sub>O<sub>4</sub>). In the first step, all the alumina phases were transformed into sodium aluminates by adding sodium carbonate as a flux to BR and then leached out through alkali-leaching to recover alumina. Subsequently, the leaching residue was mixed with carbon and roasted by using a microwave furnace at the optimum conditions. The iron oxide present in the sinter was converted into metallic iron (98%). In addition, hercynite was not detected. The produced cinder was subjected to a wet high intensity magnetic separation process to separate iron from the other elements.https://www.mdpi.com/2075-163X/11/2/222bauxite residuemicrowave roasting processiron recoveryalumina recoverysoda sintering |
| spellingShingle | Chiara Cardenia Efthymios Balomenos Pritii Wai Yin Tam Dimitrios Panias A Combined Soda Sintering and Microwave Reductive Roasting Process of Bauxite Residue for Iron Recovery Minerals bauxite residue microwave roasting process iron recovery alumina recovery soda sintering |
| title | A Combined Soda Sintering and Microwave Reductive Roasting Process of Bauxite Residue for Iron Recovery |
| title_full | A Combined Soda Sintering and Microwave Reductive Roasting Process of Bauxite Residue for Iron Recovery |
| title_fullStr | A Combined Soda Sintering and Microwave Reductive Roasting Process of Bauxite Residue for Iron Recovery |
| title_full_unstemmed | A Combined Soda Sintering and Microwave Reductive Roasting Process of Bauxite Residue for Iron Recovery |
| title_short | A Combined Soda Sintering and Microwave Reductive Roasting Process of Bauxite Residue for Iron Recovery |
| title_sort | combined soda sintering and microwave reductive roasting process of bauxite residue for iron recovery |
| topic | bauxite residue microwave roasting process iron recovery alumina recovery soda sintering |
| url | https://www.mdpi.com/2075-163X/11/2/222 |
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