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首页> 外文会议>Global Symposium on Recycling, Waste Treatment and Clean Technology; 20040926-29; Madrid(ES) >SEPARATION OF PET, PVC AND PS BY GRAVITY CONCENTRATION AND FROTH FLOTATION
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SEPARATION OF PET, PVC AND PS BY GRAVITY CONCENTRATION AND FROTH FLOTATION

机译：用重力浓缩和浮选法分离PET，PVC和PS

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摘要

In Municipal Solid Wastes (MSW) processing, mechanical separation processes like screening, magnetic, and gravity separation are already used in large scale. Nevertheless, some components of the wastes are not yet mechanically separated, due to the similarity in their physical properties. This is the case of plastics. Polyolefines like Polypropylene (PP) and Polyethylene (PE) are easily separated from heavier-than-water plastics, like Polyethylene Terephthalate (PET), Polystyrene (PS) and Polyvinyl Chloride (PVC), applying sink-float method using water as medium. PS, PET and PVC, however, have similar density being very difficult to separate one from the others. This paper describes the experimental work performed aiming the separation of PET, PVC and PS from binary mixtures of the three plastics. The separation processes used were jigging, wet shaking table and froth flotation that are processes widely used in mineral processing. It was possible to achieve complete separation of PVC from PET, using jigging. A clean PET product and a product with 63% of PS, from PET+PS mixtures with 10% PS, were produced using jigging, as well. The results of wet shaking table process applied to the mixture of PVC and PS were also very promising: a clean PVC product was obtained and the PS product was 96% grade in PS.
机译：在城市固体废物（MSW）的处理中，已经广泛使用了机械分离工艺，如筛分，磁力和重力分离。然而，由于废物的某些物理性质相似，因此尚未对其进行机械分离。塑料就是这种情况。聚烯烃（PP）和聚乙烯（PE）可以很容易地从重于水的塑料中分离出来，例如聚对苯二甲酸乙二酯（PET），聚苯乙烯（PS）和聚氯乙烯（PVC），采用水-浮法通过水为介质进行分离。但是，PS，PET和PVC具有相似的密度，很难将它们彼此分开。本文介绍了旨在从三种塑料的二元混合物中分离PET，PVC和PS的实验工作。所使用的分离工艺是夹具，湿式振动台和泡沫浮选，这是矿物加工中广泛使用的工艺。使用夹具可以实现PVC与PET的完全分离。还使用夹具制造了清洁的PET产品和具有10％PS的PET + PS混合物的具有63％PS的产品。将湿式振动台工艺应用于PVC和PS的混合物的结果也非常令人鼓舞：获得了清洁的PVC产品，并且PS产品的PS级为96％。

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