| 摘要 |
<p>1512257 Separating plastics from waste BLACK CLAWSON FIBRECLAIM INC 22 July 1975 [22 July 1974] 30703/75 Heading B2H Plastics material in municiple solid waste is recovered by (a) reducing the waste to a particulate mass having a liquid content of 20% or more such that the paper and other absorbent constituents of the waste retain sufficient liquid to be substantially heavier than pieces of the plastics material of comparable size, and (b) subjecting the particulate mass to an air separation treatment causing the plastics pieces to be blown free of the other constituents of the mass. In one form, the solid waste is first pulped in water to slurry form and some of the paper is recovered from the slurry by screening, and the reject flow from the screen is dewatered and subjected to the air separation treatment. In another form, the solid waste material is dry shredded and the high specific gravity materials removed prior to pulping.</p> |
