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Abstract
In response to the imperative for sustainable iron production with reduced CO2 emissions, this study delves into the intricate role of TiO2 in the direct reduction of iron oxide pellets. The TiO2-dependent reducibility of iron oxide pellets utilizing H2 and CO gas across varied temperatures and gas compositions is thoroughly investigated. Our findings unveil the nuanced nature of the TiO2 effect, underscored by its concentration-dependent behavior, revealing an optimal range between 1 and 1.5 pct TiO2, where a neutral or positive impact on reduction kinetics and diffusion coefficient is observed. Notably, the synergistic interplay of CO and H2 at 1000 C emerges as particularly efficacious, suggesting complementary effects on the reduction process. The introduction of H2 into the reducing atmosphere regulated by CO not only extends the transition range but also markedly expedites the rate of reduction. Furthermore, our study highlights the temperature sensitivity of the TiO2 effect, with higher TiO2 content correlating with prolonged reduction time in a 100 pct H2 atmosphere at 900 C. In a 100 pct H2 atmosphere, the non-contributory role of TiO2 stems from the water-gas shift reaction. Conversely, introducing H2 into a CO-controlled reducing atmosphere with TiO2 enhances the transition range and expedites the reduction rate. Additionally, our findings underscore the role of total iron content, revealing a direct correlation with the reduction process.
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Authors (4)
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Pasquale Cavaliere
- Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100 Lecce, Italy
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Behzad Sadeghi
- Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100 Lecce, Italy
Cite as
Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1007/s11663-024-03168-1
- License
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
no. 55,
pages 3431 - 3450,
ISSN: 1073-5615 - Language:
- English
- Publication year:
- 2024
- Bibliographic description:
- Cavaliere P., Sadeghi B., Laska A., Koszelow D.: TiO2 and Reducing Gas: Intricate Relationships to Direct Reduction of Iron Oxide Pellets// METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE -Vol. 55, (2024), s.3431-3450
- DOI:
- Digital Object Identifier (open in new tab) 10.1007/s11663-024-03168-1
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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