## 1 Introduction  
With the rapid increase of retaining of worldwide vehicles, and considering the conservation of raw material resources as well as environmental impacts, the disposal and cyclic utilization of end-of-life vehicles (ELVs) have achieved much attention over the last decade. The Economic Cooperation and Development organization (OECD) has projected that the growth of vehicles could achieve 32% from 1997 to 2020 [1; 2; 3; 4]. China has occupied the first position of global automobile production and sale since 2009, and worldwide in this year more than 13.6 million vehicles were produced and sold; meanwhile 2.7 million ELVs were abandoned. Vehicle retaining in China is estimated as up to 150 million vehicles until 2020. At this time, the domestic yield by of ELVs could achieve 9 million annually in China, with an abandon rate of 6%. Disposal and recovery of ELVs has become an important scientific, economic and social issue in China [5; 6]. Without clean disposal and recovery methods, ELVs could be a hazard to environment and ecological systems [7; 8]. However, in China the relevant industry is only just beginning. EU countries have made significant progress on disposal and recovery of ELVs. About 75% (mass basis) of ELVs are recycled and reused, but there still remains 25% in mass, named as automobile shredder residues (ASRs) or car fluffs. ASR is a solid waste mixture with extremely high heterogeneity. ASR contains moisture, ferrous and nonferrous metals, plastics, rubber, mineral materials like glass, dust, foam materials, fibers, woody materials, textiles _etc._ Due to the high heterogeneity and complex composition ASRs are classified as Hazardous Material and the EU generates about 2-3 Mt ASRs annually [1; 2; 3; 4; 7; 8; 9]. Due to high polymer content, ASR has an average lower heat value of about 20 MJ/kg [10], therefore thermal recovery processes are widely used for their energetic recovery, such as incineration, pyrolysis, and gasification. Thermal processes convert organic materials of ASR into energy or fuels but concentrate chlorine, heavy metals, and toxins present in ARS, in the ash residues [10; 11; 12], which leads to environmental risks. Moreover, the increasingly strict regulations concerning gaseous emissions also limits the thermal processes [12]. Hence according to relevant EU Directives (2000/532/EC, 2001/18/EC2, 2001/119/EC3, and 2001/573/EC4) on ELVs, after January 2015, the disposal and recovery of ELVs should achieve a recoverability rate of 95% (mass), among which the recyclability and reuse rate should achieve 85%. In China there are similar directives (National Development and Reform Commission Proclamation 2006/9) which govern the ELV recoverability rate and should achieve 95% by 2017, among which recyclability/reuse should achieve 85%. ASR Landfill will be progressively prohibited. However, ASR occupies normally 20%-25% of original ELV mass, and it is believed it will keep increasing due to the usage of plastic materials in vehicles instead of metals. Therefore in order to reduce the yield of ASR and to achieve the requirements of directives, novel post shredder technologies (PST) for advanced materially recycling of plastic materials from ELVs for feedstock material are required both in the EU and China [13; 14; 15; 16; 17]. Commonly plastics take up about 40% of ASR mass, these are a more valuable part but mixed with other materials in ASR, especially engineering plastics. Fine recycling of ELV plastic fractions to produce secondary plastic materials can be an appropriate method to satisfy the relevant directives. There are conventional PST recycling processes such as the VW-SiCon process, GALLOO process, Argonne's 4 th flotation process _etc._ for recycling of ELV plastic fractions. However, they are only able to selectively separate restricted kinds of plastic mixture products--only specific kinds of plastic like PVC get sorted individually. The mixture products normally contain two to three kinds of plastics with purities around 50%-60% [18,19].