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Developing Iron Ore Pellets Using Novel Binders for H2-Based Direct Reduction
SWERIM AB, Aronstorpsvägen 1, Luleå, 974 37, Sweden; Department of Chemical Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
SWERIM AB, Aronstorpsvägen 1, Luleå, 974 37, Sweden; Central Metallurgical Research and Development Institute (CMRDI), Cairo, 12422, Egypt.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. Central Metallurgical Research and Development Institute (CMRDI), Cairo, 12422, Egypt.ORCID iD: 0000-0002-2358-7719
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. Central Metallurgical Research and Development Institute (CMRDI), Cairo, 12422, Egypt.ORCID iD: 0000-0003-3833-0817
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2023 (English)In: Sustainability, E-ISSN 2071-1050, Vol. 15, no 14, article id 11415Article in journal (Refereed) Published
Abstract [en]

The transformation from traditional iron- and steelmaking technologies to green H2-based new technologies will require an improvement in the quality and purity of iron ore burden materials. Iron ore pellets are essential inputs for producing direct reduced iron (DRI), but the conventional binders, used in iron ore pelletizing, introduce gangue oxides to the DRI and consequently increase the slag generation and energy consumption in the steelmaking unit. Partial and/or full replacement of the traditional binders with novel organic binders would significantly contribute to improving the process efficiency, particularly in the next-generation H2-based direct reduction technology. This study illustrates the feasibility of pelletizing magnetite iron ore concentrate using four organic binders: KemPel, Alcotac CS, Alcotac FE16, and CMC, in comparison to bentonite as a reference. The study explores the influence of binder type, binder dosage, and moisture content on the characteristics and properties of the pellets. The efficiency of binders was characterized by the moisture content, drop number test, cold compression strength, and H2 reduction of pellets. For dry pellets, CMS was superior among other binders including bentonite in developing dry strength. After firing, the pellets produced by the partial replacement of bentonite with 0.1 wt.% KemPel demonstrate a performance nearly identical to the reference pellets. While the complete replacement of bentonite with organic binder shows a lower performance of fired pellets compared to the reference, it may still be suitable for use in DR shaft furnaces. The cold-bonded pellets demonstrate a superior reduction rate compared to fired pellets.

Place, publisher, year, edition, pages
Multidisciplinary Digital Publishing Institute (MDPI) , 2023. Vol. 15, no 14, article id 11415
Keywords [en]
agglomeration, CO2 emission, direct reduction, H2, magnetite concentrate, organic binders, pelletizing, strength
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-99544DOI: 10.3390/su151411415ISI: 001071292700001Scopus ID: 2-s2.0-85166242515OAI: oai:DiVA.org:ltu-99544DiVA, id: diva2:1787414
Funder
Swedish Research Council Formas, InnoAgglo project, 2020-02089
Note

Validerad;2023;Nivå 2;2023-08-14 (joosat);

Licens fulltext: CC BY License

Available from: 2023-08-14 Created: 2023-08-14 Last updated: 2024-03-07Bibliographically approved

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Ahmed, HeshamElsadek, MohamedAndersson, Charlotte

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