Phase Relationship and Activities of Components in CaO–SiO₂–Cr₂O₃ Ternary System at 1573 K

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Conclusion

For effective decarburization of chromium-containing

special steel while minimizing oxidation loss of chromium

into slag, the present study has been aimed at determining

the phase relationship of the CaO–SiO2–Cr2O3 ternary slag

and measuring the Cr2O3 activities at 1 573 K. The results

are summarized as follows.

(1) When the solution of chromium in liquid copper

obeyed Henry’s law, the activity coefficient was given as

log Cr 1.54 at 1 573 K

(2) The Cr2O3 activities were measured in the twophase region of CaO + CaCr2O4 and the three-phase coexistence of CaSiO3 + SiO2 + Ca3Cr2Si3O12 at 1 573 K. From

the present activity data, the Gibbs energy changes of the

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