Phase Equilibrium and Minor Elements Distribution between SiO2-CaO-FeOx-MgO Slag and Copper Matte at 1573K under High Partial Pressures of SO2

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  • Phase Equilibrium and Minor Elements Distribution between SiO<SUB>2</SUB>–CaO–FeO<I><SUB>x</SUB></I>–MgO Slag and Copper Matte at 1573 K under High Partial Pressures of SO<SUB>2</SUB>
  • Phase Equilibrium and Minor Elements Di
  • Phase Equilibrium and Minor Elements Distribution between SiO<SUB>2</SUB>&ndash;CaO&ndash;FeO<I><SUB>x</SUB></I>&ndash;MgO Slag and Copper Matte at 1573 K under High Partial Pressures of SO<SUB>2</SUB>

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Phase equilibrium between copper matte and SiO2–CaO–FeOx–MgO slag with Q=0.35 (Q=mass%CaO/(mass%CaO+mass%SiO2)) was investigated at 1573 K under the SO2 partial pressures of 10.1, 50.7 and 101.3 kPa as a fundamental study for thermodynamically discussing oxygen-smelting processes to produce copper. The copper and sulfur solubilities in the slag were found to be independent of pSO<SUB>2</SUB> when the matte grade was specified, and it was considered that this behavior was ascribed to the constancy of (pO<SUB>2</SUB>⁄pS<SUB>2</SUB>) against pSO<SUB>2</SUB> at a given matte grade. When the distribution ratio of a minor element, X, between the slag and matte phases was defined as Lxs/m=(mass%X in slag)/{mass%X in matte}, Lxs/m for As, Sb and Bi at a given matte grade increased with increasing pSO<SUB>2</SUB>. This behavior was explained reasonably by assuming a mutual reaction between a metallic species in the matte and an oxidic species in the slag. The distribution ratio, LAgs/m, at a given matte grade was almost constant against pSO<SUB>2</SUB>. This was considered to be ascribed to the sulfidic species of AgS0.5 prevailing in the matte phase and the constancy of (pO<SUB>2</SUB>⁄pS<SUB>2</SUB>) against pSO<SUB>2</SUB>.

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