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Thermodynamic Activity of Chromium Oxide in CaO‐SiO 2 ‐MgO‐Al 2 O 3 ‐CrO x Melts
Author(s) -
Dong Pengli,
Wang Xidong,
Seetharaman Seshadri
Publication year - 2009
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 - 10.2374/sri08sp124
Subject(s) - materials science , chromium , oxide , chromium oxide , metallurgy , thermodynamics , chemical engineering , physics , engineering
Thermodynamic activities of chromium oxide contained in CaO‐SiO 2 ‐MgO‐Al 2 O 3 melts were measured in the present work using gas‐slag equilibrium technique. The oxygen partial pressure was varied (10 ‐3 , 10 ‐4 , 10 ‐5 Pa). Gas mixture of CO, CO 2 and Ar were used and investigated at 1803, 1873 and 1923 K. The activities of CrO showed a strong positive deviation from ideality and a decrease with increasing temperature and oxygen partial pressure. A mathematical expression relating the amount of chromium oxide in the slag phase with the activity of Cr in the metal phase based on the present experimental results is presented.