Kinetics of stibnite (Sb2S3) oxidation at roasting temperatures
Experimental work on the oxidation of stibnite (Sb2S3) was carried out at temperatures between 350 and 500°C and oxygen partial pressures between 1.01 and 21.28 kPa by using a thermogravimetric analysis method. The oxidation rate of stibnite was significantly influenced by both 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/1450-5339/2014/1450-53391400012P.pdf |
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| Summary: | Experimental work on the oxidation of stibnite (Sb2S3) was carried out at
temperatures between 350 and 500°C and oxygen partial pressures between 1.01
and 21.28 kPa by using a thermogravimetric analysis method. The oxidation
rate of stibnite was significantly influenced by both temperature and partial
pressure of oxygen. Stibnite oxidized in one step to valentinite (Sb2O3) and
neither stibnite nor valentinite showed a detectable rate of volatilization
at these low temperatures. The oxidation reaction of stibnite was analyzed by
using the shrinking core model and it was found that the rate of reaction was
controlled by the surface chemical reaction and it was of 3/5 order with
respect to the oxygen partial pressure. The intrinsic rate constants were
determined and an activation energy value of 90.3 kJ/mol was obtained for the
range of temperature studied. |
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| ISSN: | 1450-5339 |