| 摘要 |
PURPOSE:To reduce the loss of copper during refining and to improve the refining stage by blowing a subsidiary material such as an alkaline earth metallic chloride into crude copper contg. a specified percentage of oxygen with an oxidizing gas. CONSTITUTION:A subsidiary material such as CaCl2 as an alkaline earth metallic chloride or a mixture of CaCl2 with CaO as an alkaline earth metallic oxide is blown into molten crude copper with an oxidizing gas such as air or oxygen- enriched air at >=30cm depth. The blown material is melted as once at the temp. of the crude copper to form finely divided slag. Since the subsidiary material is blown into the crude copper having a low O content with the oxidizing gas, the copper content of slag on the crude copper approaches equilibrium with the low-O crude copper and lowers. Accordingly, refining is carried out in a state in which the copper content of the slag is kept low. By this method, the loss of copper is reduced, and the refining stage can be improved to reduce the loss of energy.
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