Kinetics of carbothermic reduction of synthetic chromite
In order to optimize the current reduction process of chromite, a good knowledge of reduction mechanism involved is required. The basic component in chromite ore is FeCr2O4, thus, kinetic investigation of synthetic FeCr2O4 with different amount of carbon were carried out in the temperature...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2014-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2014/1450-53391400008W.pdf |
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| Summary: | In order to optimize the current reduction process of chromite, a good
knowledge of reduction mechanism involved is required. The basic component in
chromite ore is FeCr2O4, thus, kinetic investigation of synthetic FeCr2O4
with different amount of carbon were carried out in the temperature range of
1473K to 1673K under both isothermal and non-isothermal mode. The iron can be
easily reduced compared with chromium. And higher reduction degree of
chromite can be achieved by increasing temperature and carbon content. With
the supporting of X-ray Diffraction and Scanning Electron Microscope methods,
the formation of metallic products followed the sequence: Fe-C alloy,
(Fe,Cr)7C3and Fe-Cr-C alloy. Kinetics analysis showed that the first stage
was controlled by nucleation with an apparent activation energy of 120kJ/mol,
while the chromium reduction was controlled by crystallochemical
transformation with an apparent activation energy of 288kJ/mol. |
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| ISSN: | 1450-5339 |