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On the Formation of Vanadium Ferrites in CaO-SiO2-FeO-V2O5 Slags
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
2012 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 83, no 12, 1129-1134 p.Article in journal (Refereed) Published
Abstract [en]

Selective extraction of valuable elements (such as V, Cr, Mn, etc.) and their compounds from metallurgical slag is in a focus of many researchers. Although vanadium may be present in slag as oxides and/or complex spinels with Fe, Mn, etc. during an alloyed steel production, the majority of vanadium in metallurgical slags typically exists as V2O5, which comprises up to 35wt% of the slag in some cases. Due to the vanadium toxicity, these slags are forbidden in many civil engineering applications. As a result, hundreds of thousand tonnes of V2O5-bearing slags are landfilled every year. In the present work, the formation of vanadium ferrites (FeV2O4 and Fe2VO4) in synthesized CaOSiO2FeOV2O5 slags containing 5 wt% V2O5 was examined under different partial pressures of oxygen. For the current slag chemistry range, an XRD analysis confirmed the presence of vanadium ferrite in slag samples treated at 1773 K in an argon atmosphere (PO2 = 10(-1)10(-2) Pa) while no solid was noted in samples treated in air. Results were discussed based on thermodynamic consistency.

Place, publisher, year, edition, pages
2012. Vol. 83, no 12, 1129-1134 p.
Keyword [en]
vanadium ferrites, metallurgical slags, spinel
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-109619DOI: 10.1002/srin.201200134ISI: 000312153200002Scopus ID: 2-s2.0-84870536402OAI: oai:DiVA.org:kth-109619DiVA: diva2:583465
Note

QC 20130108

Available from: 2013-01-08 Created: 2013-01-08 Last updated: 2017-12-06Bibliographically approved

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