Mutual Dissolution between Matte and Ferrite Slags

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  • Acuña César
    Graduate Student, Tohoku University
  • Yazawa Akira
    The Research Institute of Mineral Dressing and Metallurgy (SENKEN), Tohoku University

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Equilibrium relations of constituent elements between matte and calcium ferrite or barium ferrite slag were investigated in this study in view of their importance in copper smelting processes. Sodium and lithium ferrite slags were also studied because of their capability to eliminate poisonous impurities.<BR>The experimental results obtained for the calcium ferrite and the barium ferrite slags showed a similar behaviour. In the region of matte grade of Cu less than 75%, the contents of copper and sulphur in the slags decrease steadily with increasing copper content in the matte, while the copper level in the slags increased steeply above this matte grade. The behaviour observed for the low grade mattes differed considerably from that for traditional silicate slag systems where the contents of copper and sulphur in the slag were low and rather constant up to a matte grade of about 70%Cu. A very high mutual solubility between the basic ferrite slags and the copper matte resulted in this notable behaviour.<BR>For high grade mattes, above 75%Cu, the basic ferrite slag and silicate slag systems showed the same tendency in respect to the solubilities of copper and sulphur, which could be explained by the prevailing oxidizing conditions where the copper constituent was suggested to be an oxidic species.<BR>Sodium and lithium ferrite slags showed complete solubility with matte up to a matte grade of 80%Cu under the condition of oxidizing smelting. In the case of copper-matte-slag three phase equilibria under reducing conditions, slag and matte were also miscible, however, under the condition of direct oxidizing smelting, a matte around 75%Cu separated from sodium ferrite slag, while phase separation was never observed in the case of lithium ferrite slag. Because of the high solubility between slag and matte and of the high volatility of sodium and lithium, these systems do not show any promising results for practical applicability when compared with the silicate slag systems.

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