| 摘要 |
<p>The present invention relates to a process for separating waste material such as domestic refuse that has already been pretreated in order to eliminate the larger part of the paper, plastic film, food remnants and ferromagnetic materials and the particle size of which has been reduced to less than 70 mm through grinding. The waste material contains both glass and aluminium, in addition to other components. The ground waste material is separated by specific gravity in three hydrocyclones or hydrocyclone-batteries connected in series. In the first hydrocyclone, in which water is used as the separating medium, the lightest materials are separated. In the second hydrocyclone, a final heavy fraction is separated. In the third hydrocyclone, the intermediate fraction obtained in the second hydrocyclone is separated into a final fraction containing practically all the glass and a final fraction containing practically all the aluminium. In the second and third hydrocyclones a heavy suspension, of the same composition in both cyclones, is used as the separating medium.</p> |
