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Reduction of FeO in molten slag by solid carbonaceous materials for HIsarna alternative ironmaking process
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Khasraw, Darbaz, Yan, Zhiming, Hage, Hans, Meijer, Koen and Li, Zushu (2022) Reduction of FeO in molten slag by solid carbonaceous materials for HIsarna alternative ironmaking process. Metallurgical and Materials Transactions B, 53 . pp. 3246-3261. doi:10.1007/s11663-022-02603-5
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Official URL: https://doi.org/10.1007/s11663-022-02603-5
Abstract
To investigate the use of biomass in the novel HIsarna technology, the reduction of FeO in the slag by chars produced from thermal coal (TC), charcoal (CC), and Bana grass char (BGC) was studied. A drop tube furnace coupled with a quadrupole mass spectrometer (DTF‐QMS) was
employed to study the injection of chars into pre‐melted slag in the temperature range between 1450 °C and 1525 °C. The reduction rate was calculated from evolved gases and the extent of FeO reduction was confirmed by Wavelength Dispersive X‐Ray Fluorescence (WDXRF). The FeO reduction proceeds through two stages, starting with a rapid reduction, which is dependent on the carbon type, and followed by gradual levelling off. The reduction rate with the charcoal char (CC) was highest, over 60% reduction was achieved in the first 500s at 1500 °C, while ~50% and 40% achieved with TC and BGC chars respectively for the same reaction time. The kinetic analysis suggests that the first and second stages of the reaction can be described by the second order (F2) and three‐dimensional diffusion (D3) models respectively. The apparent activation energy values for the first stage were 290, 229 and 267 kJ/mol for reactions with TC, CC and BGC chars, while 265, 369, and 282 kJ/mol were obtained for the second stage. Based on the experimental data and kinetic results, it can be concluded that the first stage is controlled by chemical reactions on the carbon surface, and the second stage is influenced by a mixed controlling mechanism.
| Item Type: | Journal Article | |||||||||
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| Subjects: | T Technology > TN Mining engineering. Metallurgy | |||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||
| Journal or Publication Title: | Metallurgical and Materials Transactions B | |||||||||
| Publisher: | Springer | |||||||||
| ISSN: | 1073-5615 | |||||||||
| Official Date: | October 2022 | |||||||||
| Dates: |
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| Volume: | 53 | |||||||||
| Page Range: | pp. 3246-3261 | |||||||||
| DOI: | 10.1007/s11663-022-02603-5 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access | |||||||||
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