Title

Thermodynamic Considerations for Elimination of P and Si from Molten Copper by Using Na₂CO₃ Slag

Authorship

R., ALVEAR, GERARDO; HIROYUKI, FUKUYAMA,; TOSHIHARU, FUJISAWA,; CHIKABUMI, YAMAUCHI,

R., ALVEAR, GERARDO

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HIROYUKI, FUKUYAMA,

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TOSHIHARU, FUJISAWA,

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CHIKABUMI, YAMAUCHI,

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DOI

10.5151/2594-5327-49v4-415-424

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Abstract

In order to estimate the distribution ratios of phosphorus (P) and silicon (Si) between sodium carbonate-based slag and molten copper, the thermodynamic properties of slags containing these impurity oxides at 1423 K to 1523 K were studied by the following measurements: Solubility of Na₃PO₄(s) in Na₂CO₃ melt Electrochemical measurements of Na₂O activities in Na₂O–CO₃–XOᵥ slags (where X = P or Si, and V = valence of X) under various CO₂ partial pressures Solubility measurements of CO₂ in the slags Based on the results, the equilibrium distribution ratios of P and Si between the slags and molten copper were estimated as a function of CO₂ and oxygen partial pressures and slag composition. The effectiveness of using sodium carbonate slag for the removal of these impurity elements from molten copper is discussed.

Keywords

Molten copper, Sodium carbonate slag, Phosphorus removal, Silicon removal, Thermodynamics, Distribution ratio, Slag refining, CO₂ solubility