Oxidation State of Chromium in CaO–Al2O3–CrOx–SiO2 Melts under Strongly Reducing Conditions at 1500°C |
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| Authors: | Eugene B. Pretorius R. Snellgrove Arnulf Muan |
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| Affiliation: | College of Earth and Mineral Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802 |
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| Abstract: | 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 ( p o2= 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. |
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| Keywords: | oxidation chromium melts reduction equilibrium |
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