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Determination of Vanadium Oxidation States in CaO–MgO–Al 2 O 3 –SiO 2 –VO x System by K Edge XANES Method
Author(s) -
Wang Haijuan,
Wang Lijun,
Seetharaman Seshadri
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500256
Subject(s) - xanes , vanadium , analytical chemistry (journal) , partial pressure , mole fraction , oxygen , slag (welding) , vanadium oxide , inorganic chemistry , atmospheric temperature range , absorption (acoustics) , oxidation state , oxide , chemistry , materials science , metallurgy , spectroscopy , thermodynamics , metal , physics , quantum mechanics , organic chemistry , chromatography , composite material
The oxidation states of vanadium in the CaO–MgO–Al 2 O 3 –SiO 2 –VO x slag system are investigated with the initial V 2 O 5 concentration in the range of 1–10 mole fraction, in the temperature range, 1823–1923 K, partial pressures of oxygenP O 2from 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 VO x , at a given temperature,P O 2and basicity, x is found to increase slightly with increase of initial V 2 O 5 concentration. With the increase of slag basicity, x is increased. It is also found that x in VO x 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 V 3+ /V 4+ and V 4+ /V 5+ ratios for a given slag as functions of basicity, temperature, and oxygen partial pressure.