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Mechanism study on solid-state reduction in the Fe2O 3-NiO-Cr2O3-C system using thermal analyses
Luleå tekniska universitet.
LKAB.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.
2005 (engelsk)Inngår i: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 34, nr 1, s. 22-30Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In order to clarify the interactions among metal oxides during reduction of pickling sludge, the reduction mechanism of the metal oxide mixture, Fe 2O3-NiO-Cr2O3, which simulates the composition of these metal oxides in pickling sludge, was studied using graphite as a reductant, by means of thermal analysis techniques. X-ray diffraction analysis was used for characterization of reduction products. In addition to the reduction test on the metal oxide mixture mentioned above, for comparison, separate tests on the reduction of Fe2O3, NiO and Cr 2O3 were also conducted. The results demonstrate that through formation of a transitional compound 'FeCr2O4', Fe2O3 promotes the complete reduction of Cr 2O3 at a temperature lower than that required for reducing pure Cr2O3. On the other hand, Cr2O 3 hinders the reduction of Fe2O3 at lower temperatures. The whole reduction process may be classified as five distinguishable reduction stages in which possible reactions were proposed to represent the reduction mechanism. The reduced metals in the final product exist primarily in the form of solid solutions, such as 'Cr-Fe-Ni', which mainly containing '(Fe,Ni)' and '(Fe,Cr)', and small amounts of carbides, such as (Cr,Fe)7C3 and/or Cr7C3

sted, utgiver, år, opplag, sider
2005. Vol. 34, nr 1, s. 22-30
HSV kategori
Forskningsprogram
Processmetallurgi
Identifikatorer
URN: urn:nbn:se:ltu:diva-12866DOI: 10.1111/j.1600-0692.2005.00715.xISI: 000226853100004Scopus ID: 2-s2.0-14044256485Lokal ID: c03672f0-fcbb-11dc-a946-000ea68e967bOAI: oai:DiVA.org:ltu-12866DiVA, id: diva2:985817
Merknad
Validerad; 2005; 20080328 (cira)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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