About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Towards a Future of Sustainable Production and Processing of Metals and Alloys
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Presentation Title |
Influence of Pre-oxidation on the Hydrogen-based Direct Reduction of Combusted Iron Powder |
Author(s) |
Laurine Choisez, Kira Hemke, Özge Özgun, Dierk Raabe, Yan Ma |
On-Site Speaker (Planned) |
Laurine Choisez |
Abstract Scope |
Iron powder has recently been proposed as a promising sustainable alternative to fossil fuels due to its high energy density, low toxicity and abundance. Iron powder releases chemically stored energy through exothermic oxidation (combustion), and stores back energy through its sustainable reduction. Hydrogen-based reduction has gained attention due to its huge potential for sustainable iron and steel production. In particular, a positive influence of the pre-oxidation of fine magnetite ores on the direct reduction kinetics has been reported in the literature. In this study, we investigate the influence of pre-oxidation of burned iron powder on its hydrogen-based direct reduction at low temperature (400-500°C) using thermogravimetry and in-situ high-energy X-ray diffraction. Different reduction kinetics are highlighted for the two different processes, with successive or simultaneous hematite and magnetite reduction. A strong influence of pre-oxidation is also highlighted on the final microstructure and porosity distribution of the reduced powder. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Recycling and Secondary Recovery, |