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Abstract
The steel industry relies heavily on the direct reduction of iron ore pellets, which is a more environmentally friendly alternative to traditional blast furnaces, by reducing CO2 emissions. This study investigated the effects of different TiO2 contents on the reducibility of high-grade iron ore pellets using hydrogen (H2). The research employed HSC chemistry, COMSOL Multiphysics, and X-ray tomography to analyse the thermodynamics and kinetics of hematite reduction. The results indicate that TiO2 significantly affects reducibility; pellets with less than 0.5 % TiO2 show improved reducibility due to favorable microstructural changes, while higher TiO2 content reduces porosity and slows down reduction rates. However, increasing the H2 pressure to 8 bar mitigated the detrimental effects of the high TiO2 content and improved the porosity and reduction kinetics. These results support the theoretical predictions, provide guidelines for optimizing pellet formulations, and emphasize the importance of controlling the TiO2 content and operating conditions for efficient reduction processes.
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Authors (8)
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Behzad Sadeghi
- Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria
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Pasquale Cavaliere
- Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100 Lecce, Italy
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Mutlucan Bayat
- Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100 Lecce, Italy
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Marie Aminaei
- Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100 Lecce, Italy
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Niloofar Ebrahimzadeh Esfahani
- Faculty of Electrical Engineering and Information, Slovak University of Technology, Ilkovicova 3, 81219 Bratislava, Slovakia
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Natalia Ramos Goncalves
- Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100 Lecce, Italy
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.powtec.2025.120813
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
POWDER TECHNOLOGY
no. 455,
ISSN: 0032-5910 - Language:
- English
- Publication year:
- 2025
- Bibliographic description:
- Sadeghi B., Cavaliere P., Bayat M., Aminaei M., Esfahani N. E., Mirowska A., Koszelow D., Ramos Goncalves N.: Effect of TiO2 percentage on the hydrogen-based direct reducibility of high-grade pellets// POWDER TECHNOLOGY -Vol. 455,iss. 120813 (2025),
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.powtec.2025.120813
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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