| 摘要 |
PURPOSE:To reduce refining cost by securing effective and efficient reduction refining, in a method for together using a solid and a gaseous reducing agents, by respectively using the solid and the gaseous reducing agents above and under the surface of molten black copper. CONSTITUTION:Molten copper 10 is received in a refining furnace 1 so as to reach an almost half level in said furnace 1 and, if necessary, S, As, Sb and Pb are removed by blowing air and nitrogen or by throwing an additive into said furnace from a tuyere. Thereafter, a solid carbonaceous reducing agent is charged into the furnace so as to thinly cover the surface of the molten copper 10 as shown by the numeral in the drawing. This charging is performed, for example, by a method wherein an exclusive boat 16, in which a predetermined amount of the solid carbonaceous reducing agent is received, suspended from a crane is positioned at a charging port and said reducing agent is downwardly discharged from the bottom of the boat. In the next step, a gaseous reducing agent is blown into the molten copper 10 from tuyeres 9 under the surface of said molten copper 10. By this method, the re-oxidation of the molten copper 10 is prevented by the solid reducing agent while it is suppressed that the gaseous reducing agent is not sufficiently contacted with the molten copper and diffusedly escaped therefrom and, therefore, reducing treatment can be effectivey performed.
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