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Sustainable pathway towards red mud valorization through biomass thermochemical conversion and metals recovery
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0002-2071-9309
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0002-6326-4084
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Resource recovery.ORCID iD: 0000-0001-7614-8448
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0001-9831-6633
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2025 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 434, article id 132847Article in journal (Refereed) Published
Abstract [en]

Red mud is a hazardous waste of the alumina refining process, with 1–1.5 tons generated per ton of alumina produced. This study presents a first-of-its-kind understanding of a biomass-based pathway for recovering iron from red mud. Simultaneous red mud reduction and biomass gasification (SRG) is proposed as a viable pathway to produce zero-valent iron. This metallic iron can potentially be recovered by weak magnetic separation and integrated into the iron-making industry. The steps of the red mud-biomass phenomena were investigated through thermogravimetric analysis followed by XRD characterization. Complete reduction from Fe3+ to Fe0 was achieved at temperatures near 900 °C and verified by XRD, XPS, and FTIR. Bench-scale SGR experiments were also performed to survey the compositions of gaseous and tar products. Bench-scale SRG experiments confirmed increased syngas (CO and H2) production and demonstrated the tar-cracking catalytic activity of red mud.

Place, publisher, year, edition, pages
Elsevier BV , 2025. Vol. 434, article id 132847
Keywords [en]
Biomass gasification, Iron recovery, Red mud reduction, Tar cracking, Thermochemical conversion
National Category
Separation Processes
Identifiers
URN: urn:nbn:se:kth:diva-368748DOI: 10.1016/j.biortech.2025.132847ISI: 001530448500003PubMedID: 40541579Scopus ID: 2-s2.0-105008518830OAI: oai:DiVA.org:kth-368748DiVA, id: diva2:1990861
Note

QC 20250821

Available from: 2025-08-21 Created: 2025-08-21 Last updated: 2025-10-21Bibliographically approved

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Cabral de Souza, Pedro HenriqueEngvall, KlasPenha, Frederico M.Kantarelis, EfthymiosNazir, Shareq Mohd

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Cabral de Souza, Pedro HenriqueEngvall, KlasPenha, Frederico M.Kantarelis, EfthymiosNazir, Shareq Mohd
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