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Research on Flotation Technique of separating PET from plastic packaging wastes

机译：塑料包装废弃物分离宠物浮选技术研究

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摘要

Flotation, as one efficient waste plastic separation technology, is an effective method to improve the recycling rate of packaging waste. Polyethylene terephthalate (PET) widely used in packaging industry, has a large number of consumption and high recovery value. Aiming at separating PET from plastic packaging wastes, a designed flotation column was used in laboratory to investigate the effects of parameters, such as wetting agent species and wetting agent concentration, on the flotation behaviors. The results showed that the primary flotation of PET/polyvinyl chloride(PVC)/polycarbonate(PC)/ polystyrene(PS)achieved the optimal effect with PS as floating materials and PET/PC/PVC sinking materials under 70mg/L of sodium dodecyl sulfate as wetting agent. When 3mol/L sodium hydroxide used to modify the mixed plastics and 8mmol/L of dibutyl sebacate (DBS) used as wetting agent, PET/PC/PVC separation in the secondary flotation achieved the optimal effect with PET floating rate being 3.56% and PC/PVC floating rate being 97.45% and 92.91% respectively. After two stages of flotation screening, the purity of recycled PET finally reached 90.91%, which indicated that the flotation process developed could effectively separate PET from four kinds of mixed plastics.
机译：浮选是一种有效的废塑料分离技术，是提高包装废物回收率的有效方法。广泛用于包装行业的聚对苯二甲酸乙二醇酯（PET）具有大量的消费和高回收率。针对从塑料包装废弃物分离PET，在实验室中使用的设计浮选柱研究的参数的影响，如润湿剂物种和润湿剂浓度，对浮选行为。结果表明，PET /聚氯乙烯（PVC）/聚碳酸酯（PC）/聚苯乙烯（PS）的初级浮选与PS作为浮动材料和PET / PC / PVC沉没材料的最佳效果达到了70mg / L的十二烷基硫酸钠作为润湿剂。当用于改性用作润湿剂的混合塑料和8mmol / L二丁酯（DBS）的3mol / L氢氧化钠，二次浮选中的PET / PC / PVC分离达到了PET浮动率为3.56％和PC / PVC浮动率分别为97.45％和92.91％。在浮选筛选的两个阶段之后，再生宠物的纯度最终达到90.91％，这表明开发的浮选过程可以有效地将宠物分离出四种混合塑料。

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