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Thermogravimetric study on carbothermic reduction of chromite ore under non-isothermal conditions
Luleå tekniska universitet.
Swerea MEFOS AB, Luleå tekniska universitet, SSAB Tunnplåt AB, LKAB.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
2015 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 42, no 6, p. 409-416Article in journal (Refereed) Published
Abstract [en]

In this paper, the reduction of chromite ore by coke was investigated by means of thermogravimetric analysis under non-isothermal conditions (from room temperature to 1823 K). The fractional reduced samples were examined by SEM/EDS and X-ray diffraction analyses. The experimental results showed that the reduction of iron in the chromite ore started before that of chromium in the ore, and the reduction of chromium and iron in the ore overlapped to some degree. Chromium iron carbide was found to be the transient phase during the reduction, and a chromium gradient was found in the fractional reduced sample at temperature higher than 1623 K. A four-stage reduction process was proposed: one stage involving the reduction of iron in the chromite ore and three stages involving the reduction of chromium in the ore. The activity aspects of component FeCr2O4 and component MgCr2O4 in the chromite ore were considered. The difficulty in the reduction of the chromite ore is attributed to the fact that, as the reduction proceeds, the activity of the component MgCr2O4 in the fractional reduced ore will decrease to a very low level, which makes further reduction very difficult.

Place, publisher, year, edition, pages
2015. Vol. 42, no 6, p. 409-416
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-7868DOI: 10.1179/1743281214Y.0000000243ISI: 000357110500002Scopus ID: 2-s2.0-84940102737Local ID: 64b1b7cb-12ae-4845-b5ec-c5906255f51aOAI: oai:DiVA.org:ltu-7868DiVA, id: diva2:980758
Note
Validerad; 2015; Nivå 2; 20141028 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Yang, QixingBjörkman, Bo

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