| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for dissolving a copper scrap alloy by which, on dissolution of a copper scrap alloy, hydrogen in a molten metal can rapidly be removed as possible. SOLUTION: In the copper scrap alloy adhered with emulsion, rolling oil, or lubricating oil, a metallic reducing agent such as Mg, Si, Zr, Ti and Al is contained by >=20 wt.%. This alloy is subjected to reducing dissolution and then, the surface of the molten metal is coated with charcoal only for preventing reoxidation. Next, bubbling by an inert gas such as gaseous Ar is performed to control the concentration of hydrogen to <=3 ppm, so that casting defects such as splitting and blistering are prevented.</p> |
