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Carbothermic reduction of synthetic chromite with/without the addition of iron powder
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
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2016 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 56, no 12, p. 2147-2155Article in journal (Refereed) Published
Abstract [en]

Carbothermic reduction of chromite is an important industrial process for extracting chromium from the chromite. To have a better understanding of the effect of iron on the carbothermic reduction of chromite, the reduction of synthetic chromite (FeCr2O4) by graphite with/without the addition of iron powder was investigated in this paper by Thermogravimetric Analysis (TGA) in argon atmosphere. The fractional reduced samples were examined by SEM/EDS and XRD analysis, and the reduction process was thermodynamically and kinetically evaluated. The experimental results show that the iron powder addition enhances the reduction of FeCr2O4 and this effect increases when increased amounts of iron powder are added. This phenomenon is attributed to the in situ dissolution of chromium into the iron and mixed carbide (Cr,Fe)7C3, which can decrease the activity of the nascent chromium formed by the reduction of the FeCr2O4. The experimental results indicate that the reduction of FeCr2O4 with up to 80 wt.% iron powder addition is likely to be a single-step process and the kinetic analysis suggests that the reduction reaction is likely to be either (a) chemical reaction at the surface of FeCr2O4 or (b) diffusional dissolution of the product (FeCr2) into the iron/alloy particles or the mixed control of (a) and (b).

Place, publisher, year, edition, pages
Iron and Steel Institute of Japan , 2016. Vol. 56, no 12, p. 2147-2155
Keywords [en]
Carbothermic reduction, Chromite, Kinetics, Thermogravimetric analysis
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-201583DOI: 10.2355/isijinternational.ISIJINT-2016-337ISI: 000390733000006Scopus ID: 2-s2.0-85007240939OAI: oai:DiVA.org:kth-201583DiVA, id: diva2:1073435
Note

QC 20170210

Available from: 2017-02-10 Created: 2017-02-10 Last updated: 2017-11-29Bibliographically approved

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