Flotation separation of polyvinyl chloride and polyethylene terephthalate plastics combined with surface modification for recycling.
Flotation separation of polyvinyl chloride and polyethylene terephthalate plastics combined with surface modification for recycling.
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DOI：
10.1016/j.wasman.2015.07.053
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发表时间：
2015-11
期刊：
影响因子：
8.1
通讯作者：
Chongqing Wang;Hui Wang;J. Fu;Lingling Zhang;Chengcheng Luo;Younian Liu
中科院分区：
文献类型：
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作者：
Chongqing Wang;Hui Wang;J. Fu;Lingling Zhang;Chengcheng Luo;Younian Liu
采用高锰酸钾（KMnO 4）溶液对废旧聚氯乙烯（PVC）和聚对苯二甲酸乙二酯（PET）进行表面改性处理。PVC的可浮性随KMnO 4浓度、处理时间、温度和搅拌速度的增加而降低，而PET的可浮性不受影响。傅立叶变换红外光谱（FT-IR）分析表明，改性机理可能是由于PVC表面发生了氧化反应。最佳工艺条件为：KMnO 4浓度1.25 mM/L，处理时间50 min，温度60 °C，搅拌速度300 r/min，起泡剂浓度17.5 g/L，浮选时间1 min。采用两段浮选法对不同粒径的PVC和PET进行了有效分离。超声波辅助表面改性后，不同质量比的PVC和PET可通过一级浮选有效分离。浮选分离后产品纯度达99.30%，回收率达99.73%。设计了一种结合表面改性的浮选分离PVC和PET塑料的工艺。这项研究为回收行业提供了塑料废物物理分离的技术见解。
Surface modification with potassium permanganate (KMnO4) solution was developed for separation of polyvinyl chloride (PVC) and polyethylene terephthalate (PET) waste plastics. The floatability of PVC decreases with increasing of KMnO4concentration, treatment time, temperature and stirring rate, while that of PET is unaffected. Fourier transform infrared (FT-IR) analysis confirms that mechanism of surface modification may be due to oxidization reactions occurred on PVC surface. The optimum conditions are KMnO4concentration 1.25 mM/L, treatment time 50 min, temperature 60 °C, stirring rate 300 r/min, frother concentration 17.5 g/L and flotation time 1 min. PVC and PET with different particle sizes were separated efficiently through two-stage flotation. Additionally, after ultrasonic assisted surface modification, separation of PVC and PET with different mass ratios was obtained efficiently through one-stage flotation. The purity and the recovery of the obtained products after flotation separation are up to 99.30% and 99.73%, respectively. A flotation process was designed for flotation separation of PVC and PET plastics combined with surface modification. This study provides technical insights into physical separation of plastic wastes for recycling industry.