| 摘要 |
PURPOSE:To manufacture a high quality ingot at a low cost by adding a specified amount of P to molten Cu contg. impurities as raw material, oxidizing the molten metal, separating the impurities, oxidizing and removing the P, and regulating the oxygen content by reduction. CONSTITUTION:Cu contg. metals which are oxidized more readily than Cu as impurities is continuously melted as raw material in a melting furnace 1, and 0.4-0.7wt% P is added to the molten metal and melted in a transfer path 2. The molten metal is oxidized in an oxidation zone 3 to regulate the oxygen content preferably to 500-3,000ppm, and it is held for about 20-120min so that part of the P and the impurities are oxidized and floated. After the resulting oxides are separated, the molten metal is highly oxidized in a high oxidation zone 4 to regulate the oxygen content preferably to about 500-2,000ppm and it is held for about 5-60min to oxidize and remove the residual P. The molten metal is then reduced with charcoal or the like in a reduction zone 5 to regulate the oxygen content to a prescribed value and it is poured into a casting machine 7 through a casting pot 6. An ingot having superior characteristics such as high electric conductivity is obtd.
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