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Activity of chromium oxide and phase relations for the CaO‐SiO 2 ‐CrO X system at 1873 K under moderately reducing conditions
Author(s) -
Morita Kazuki,
Mori Mamiko,
Guo Muxing,
Ikagawa Toru,
Sano Nobuo
Publication year - 1999
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199905647
Subject(s) - decarburization , chromium , slag (welding) , metallurgy , oxide , solubility , phase (matter) , materials science , chromium oxide , analytical chemistry (journal) , mineralogy , inorganic chemistry , chemistry , environmental chemistry , organic chemistry
In order to optimize the slag composition operated in the decarburization process of stainless steel production, activity of chromium oxide, a CrO X , and phase relations for the CaO‐SiO 2 ‐CrO X system have been investigated under moderately reducing conditions, P O2 = 7.04•10 − 6 Pa at 1873 K. Activity coefficients of chromium oxides show strong dependencies on X CaO / X SiO2 , an index of basicity, and chromium content of the slag. Solubility of chromium oxide in the slag system drastically decreases with increasing X caO / X SiO2 , which is consistent with increase in activity coefficients of chromium oxides. The optimal CaO‐SiO 2 ‐CrO X slag for a practical decarburization process has been recommended to be doubly saturated with CrO 1.5 and CaCr 2 O 4 , namely X CaO/XsiO 2 = 1.47 at 1873 K, which may not be significantly affected by operating temperatures.