Reduction mechanism of titanomagnetite concentrate by carbon monoxide
Titanomagnetite concentrate was reduced by CO-Ar gas mixtures in a laboratory fixed bed reactor in the temperature range from 1123 to 1323 K. The influences of reductive conditions on the reduction rate and metallization degree including reduction temperature, reduction time and carbon mono...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2013-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391300020S.pdf |
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| Summary: | Titanomagnetite concentrate was reduced by CO-Ar gas mixtures in a laboratory
fixed bed reactor in the temperature range from 1123 to 1323 K. The
influences of reductive conditions on the reduction rate and metallization
degree including reduction temperature, reduction time and carbon monoxide
content were studied. And the characteristics of reduced samples were
analyzed by XRD, BES and EDS. Results shown that both the reduction and
metallization degree increased with the increasing of temperature and
monoxide content. The low reduction degree was owing to the low iron oxides
content and high impurities content such as magnesium oxide in
titanomagnetite concentrate. Above 1123 K, the reduction is controlled by
interfacial chemical reaction at early stage of the reaction and then turns
to the internal diffusion controlling with reaction processing. The reduction
path at temperatures above 1123 K is suggested as follow: Fe3-xTixO4 →
(x+y-1)FeO + Fe4-2x-yTixO4-y → (x+y-1)Fe + Fe4-2x-yTixO4-y → (3-x)Fe + xTiO2
(0<y<4-2x, x=0.27±0.02) |
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| ISSN: | 1450-5339 |