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Determination of Vanadium Oxidation States in CaO-MgO-Al2O3-SiO2-VOx System by K Edge XANES Method
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
2016 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 87, no 2, 199-209 p.Article in journal (Refereed) Published
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Abstract [en]

The oxidation states of vanadium in the CaO-MgO-Al2O3-SiO2-VOx slag system are investigated with the initial V2O5 concentration in the range of 1-10 mole fraction, in the temperature range, 1823-1923K, partial pressures of oxygen from 10(-5) to 10(3)Pa, and with the basicities in the range of 0.85-2.20. The valance states of vanadium are determined by the X-Ray Absorption Near-Edge Structure (XANES) method. The results indicates that, for the oxide VOx, at a given temperature, and basicity, x is found to increase slightly with increase of initial V2O5 concentration. With the increase of slag basicity, x is increased. It is also found that x in VOx decreases with the increase of temperature, whereas, at constant basicity, the value of x increases with the increased oxygen partial pressure. The present results are useful in the quantification of V3+/V4+ and V4+/V5+ ratios for a given slag as functions of basicity, temperature, and oxygen partial pressure.

Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2016. Vol. 87, no 2, 199-209 p.
Keyword [en]
oxidation states, slags, vanadium, XANES
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-183331DOI: 10.1002/srin.201500256ISI: 000369824100008Scopus ID: 2-s2.0-84956901510OAI: oai:DiVA.org:kth-183331DiVA: diva2:910484
Note

QC 20160309

Available from: 2016-03-09 Created: 2016-03-07 Last updated: 2016-03-19Bibliographically approved

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