Bakker E J, Rem P C, Fraunholcz N
Resource Engineering, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands.
Waste Manag. 2009 May;29(5):1712-7. doi: 10.1016/j.wasman.2008.11.006. Epub 2009 Jan 6.
Polyolefin fractions are often end fractions resulting from the recycling of end-of-life consumer products. Polypropylene (PP) and polyethylene (PE) are present in such fractions as a mixture. For instance, the ratio of PP and PE in car scrap is 70:30 on average. However, the grade of the PP and PE should typically be better than 97% to be reused again as a high quality product. Density separation of the different polyolefins can be a solution. A promising separation technique is the inverse magnetic density separator (IMDS). This paper discusses the potential of shredder residue, one of the possible polyolefin's waste stream sources for the IMDS, in detail. Experiments with the separation of polyolefins with an IMDS prototype show both high grade and high recovery. The paper concludes with the economic opportunities of the IMDS in the recycling of polyolefins.
聚烯烃馏分通常是报废消费品回收产生的尾馏分。聚丙烯（PP）和聚乙烯（PE）以混合物形式存在于此类馏分中。例如，汽车报废材料中PP和PE的比例平均为70:30。然而，PP和PE的等级通常应优于97%才能再次作为高质量产品重新使用。不同聚烯烃的密度分离可能是一种解决方案。一种有前景的分离技术是逆磁密度分离器（IMDS）。本文详细讨论了切碎残渣作为IMDS可能的聚烯烃废物流来源之一的潜力。使用IMDS原型对聚烯烃进行分离的实验显示出高纯度和高回收率。本文最后总结了IMDS在聚烯烃回收方面的经济机遇。
