Abstract
The nitrogen and carbon solubilities in the CaO-Al 2 O 3 -CaF 2 slag system at 1723K were measured to understand the effect of CaF 2 on the nitrogen and carbon dissolution behaviour using thermochemical equilibration technique. The nitride capacity in the CaO satd .-Al 2 O 3 -CaF 2 system was constant until X Al2 O 3 /X CaF2 = 0.23, followed by decrease with an increase in X Al2 O 3 / X CaF2 ratio, and then showed a constant value. The carbide capacity in the CaO satd .-Al 2 O 3 -CaF 2 system also showed the similar behaviour to the nitride capacity, however, the effect of CaF 2 on the activity coefficient of nitride and carbide ions showed some differences in case of X CaF2 = 0.2. The effect of CaF 2 on the activity coefficient of carbide and nitride ions would not be significant in case of CaO-rich region of X CaO X CaF 0.31. However, CaF 2 could be expected to affect the activity coefficient of each ion in case of the Al 2 O 3 -rich region, causing compensating effect of the incorporated nitride (carbide) mechanism. The relationship between nitride and carbide capacity was also discussed.
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