| 摘要 |
<p>Small pieces of scrap containing a mixture of metals obtained from previous fragmentation by crushing of the scrap in hammer mills or the like and from which at least a major portion of ferrous materials has been removed to provide such mixture rich in ductile metals, is subjected to further size reduction in a granulating chopper. The chopped product is classified by screening into several cuts of different size and each cut separately subjected to further dry separation into components differing in density to recover the individual metal components. In a preferred embodiment, prior to charging to the granulating chopper, the pieces of scrap from the last crushing operation preceding, are subject to air separation so as to remove selectively therefrom heavy particles, such as nuggets or the like, likely otherwise to damage the chopper blades. The light fraction from the air separation may optionally be subjected to magnetic separation to remove any remaining ferrous materials released by the crushing and/or air separation, from its encapsulation or occlusion in diamagnetic covering materials.</p> |
