| 摘要 |
<p>PURPOSE:To completely separate a metal of a low sp.gr. and high m.p. and a metal of a high sp.gr. and low m.p. in the form of solid and molten metals by melting a mixture composed of the both metals and cooling the melts to the temp. between the m.p. of the two metals. CONSTITUTION:The metal mixture composed of, for example, Fe and Cu, varying in the sp.gr. and the m.p. is charged into a melting furnace 1 and a high-frequency induction heating coil 2 on the side wall of the melting furnace 1 is energized to melt the metal mixture composed of the Fe and the Cu. The molten metal 4 of the Cu having the large sp.gr. settles in the lower part and the molten metal 3 of the Fe having the small sp.gr. floats in the upper part. The molten metal in the mixed state of the Fe and the Cu exists in the intermediate part thereof. The current of the high-frequency induction heating coil 2 is then gradually decreased to slowly cool the two molten metal layers 3, 4. The layers are thus cooled to, for example, 1200 deg.C intermediate temp. of 1083 deg.C which is the m.p. of the Cu and 1540 deg.C which is the m.p. of the C and the Fe. The Fe 3 having the high m.p. is solidified to the solid Fe which floats on the molten metal 4 of the Cu of the low m.p. The Fe in the intermediate part of both solidifies as well and floats on the molten Cu 4, by which the Fe is separated. An ejection port 6 in the bottom of the melting furnace 1 is opened to discharge the Cu in the molten state which is thus separated from the Fe 3.</p> |
