Effect of TiO2 percentage on the hydrogen-based direct reducibility of high-grade pellets
Sadeghi, Behzad; Cavaliere, Pasquale; Bayat, Mutlucan; Aminaei, Marieh; Esfahani, Niloofar Ebrahimzadeh; Laska, Aleksandra; Koszelow, Damian; Goncalves, Natalia Ramos (2025-02-15)
Elsevier
15.02.2025
Behzad Sadeghi, Pasquale Cavaliere, Mutlucan Bayat, Marieh Aminaei, Niloofar Ebrahimzadeh Esfahani, Aleksandra Laska, Damian Koszelow, Natalia Ramos Goncalves, Effect of TiO2 percentage on the hydrogen based direct reducibility of high-grade pellets, Powder Technology, Volume 455, 2025, 120813, ISSN 0032-5910, https://doi.org/10.1016/j.powtec.2025.120813
https://creativecommons.org/licenses/by/4.0/
© 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202502201761
https://urn.fi/URN:NBN:fi:oulu-202502201761
Tiivistelmä
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.
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.
Kokoelmat
- Avoin saatavuus [38823]
Ellei muuten mainita, aineiston lisenssi on https://creativecommons.org/licenses/by/4.0/