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Vol.33, No.9, 1205 ~ 1212, 1995
Title
The Effect of Slag Basicity on the Nitrogen Dissolution Mechanism in B2O3 Based Slags
민동준 Dong Joon Min
Abstract
The nitrogen solubility and nitride capacity of the BaO-B₂O₃ and CaO-B₂O₃ slag systems at high temperatures were measured in order to understand the nitrogen solution mechanism of slag by using a chemical equilibration technique. The present slag systems were chosen because they have wide liquid regions at the temperature of interest and were expected to show two different types of nitride dissolution behaviors. The nitride capacities of both systems showed some minimum values with changing composition. This was explained by considering that nitrogen can dissolve into slag as "free nitride" at high basicities and "nitride incorporated" with the network for acidic slags. The change of nitride capacity with optical basicity and the activity of the basic component followed the predicted behavior for the proposed solution mechanism. The nitride capacity of the BaO-B₂O₃ system is considerably greater than that of the CaO-B₂O₃ system because BaO is a more basic oxide than CaO.
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