Abstract
Thermodynamic properties of NaO 0.5 -CO 2 -FeO 1.5 slag have been investigated for the application of sodium carbonate slag to the elimination of Fe from molten copper. The activities of NaO 0.5 and Na(CO 3 ) 0.5 were measured by the EMF method, using β″-alumina as a solid electrolyte for various partial pressures of CO 2 at 1423 to 1523 K. There is a stable solid compound NaFeO 2 in this system, and the solubility measurement of this compound into sodium carbonate melt at 1523 K revealed that the solubility is highly limited and controlled by the partial pressure of CO 2 . The dissolution reaction seems to proceed according to the following reaction and Fe exists as FeO 3 3− anion in the sodium carbonate-based melt
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