Oxidation State of Chromium in CaO-Al2O3-CrOx-SiO2 Melts under Strongly Reducing Conditions at 1500°C

Equilibrium ratios Cr2+/Cr3+ of chromium oxide dissolved in CaO–chromium oxide–Al2O3–SiO2 melts have been determined by analysis of samples equilibrated at 1500°C under strongly reducing conditions (po2= 10−9.56 to 10−12.50 atm). The majority of the chromium is divalent (Cr2+) under these conditions...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1992-06, Vol.75 (6), p.1378-1381
Main Authors: Pretorius, Eugene B., Snellgrove, R., Muan, Arnulf
Format: Article
Language:English
Subjects:
Chemistry
chromium
equilibrium
Exact sciences and technology
General and physical chemistry
Liquid-vapor equilibria
melts
oxidation
Phase equilibria
reduction
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Summary:Equilibrium ratios Cr2+/Cr3+ of chromium oxide dissolved in CaO–chromium oxide–Al2O3–SiO2 melts have been determined by analysis of samples equilibrated at 1500°C under strongly reducing conditions (po2= 10−9.56 to 10−12.50 atm). The majority of the chromium is divalent (Cr2+) under these conditions and Cr2+/Cr3+ ratios at given constant oxygen pressures decrease with increasing basicity of the melts, expressed as CaO/SiO2 ratios. In addition, Cr2+/Cr3+ ratios, at a given CaO/SiO2 ratio, are relatively unaffected by the amount of Al2O3 present.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1992.tb04197.x