Reduction Reactions in Al2O3-C-Fe and Al2O3-Fe2O3-C Systems at 1 823 K
2014 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 54, no 7, 1485-1490 p.Article in journal (Refereed) Published
With a view to produce Fe-Al alloys for deoxidation during steel refining, chemical reactions were investigated in Al2O3-C-Fe and Al2O3-Fe2O3-C systems at 1 823 K. Using a horizontal tube furnace and argon atmosphere, interactions were investigated for time periods up to 2 hours. Two sets of blends were prepared from initial constituents, which were later used to prepare two types of substrates. Alumina and synthetic graphite powders were blended in a 70: 30 proportion (blend l), and in the second set, Fe2O3 was blended with C in a proportion of 75:25 (blend II). In one case, blend I was mixed thoroughly with iron powder (Fe (2.7 pct C)) in a ratio of 80:20; in the second case, blend I was mixed with blend II in the ratio of 70:30. We report significant reduction reactions in both cases. SEM/EDS studies on the Al2O3-C-Fe system showed unambiguous evidence for the pick-up of aluminium by molten iron after 1 hour. Levels of aluminium in molten iron were found to increase significantly with time. Due to in-situ reduction of Fe2O3, the generation of CO gas and associated turbulence, the reactions were quite fast in the Al2O3Fe2O3-C system. X-ray diffraction studies showed the presence of additional diffraction peaks belonging to Fe(3)AIC and Fe(3)AI systems. Molten iron was found to act as a reducing agent and a metallic solvent in both cases. This study provides evidence for the carbothermic reduction of alumina at 1 823 K and for the formation of ferroalloys directly from mixed oxides of aluminium and iron.
Place, publisher, year, edition, pages
2014. Vol. 54, no 7, 1485-1490 p.
alumina, iron oxide, carbon, molten iron, reduction, Fe-Al alloys
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-149518DOI: 10.2355/isijinternational.54.1485ISI: 000339456500003ScopusID: 2-s2.0-84906750946OAI: oai:DiVA.org:kth-149518DiVA: diva2:739852
QC 201408222014-08-222014-08-222014-08-22Bibliographically approved