銅の熔錬に関する研究 (第8報)

マット中の酸素量に及ぼす平衡気相中の酸素, 硫黄圧の影響

抄録

Fundamental studies concerning the mutual dissolution between matte and slag in equilibrium with solid iron were previously carried out by the authors. In order to investigate the behaviours of magnetite in the principal system of copper smelting, the equilibrium between matte and gas was at first studied in the current work. Synthetic matte prepared was melted in an alumina crucible, and then, the system was kept in equilibrium with a mixture of CO, CO₂ and SO₂ gases for a certain period of time. The desired partial pressures of oxygen and sulfur which are closely related to the expectant activities of FeO and Fe₃O₄ were obtained by controlling the composition of leading gas (CO-CO₂-SO₂) to the system. In this work, series of experiments concerning the effects of gas composition, temperature and matte composition on the oxygen content in matte were performed and discussed in terms of FeO and Fe₃O₄ activities. The results obtained clearly show that the content of oxygen in matte increases with increasing activities of FeO and Fe₃O₄.