Evaluation of Solid Fuel Derived from ASR Plastics and Sawdust

Abstract

ASR (Automobile Shredder Residues) is mainly recycled thermally in Japan since the shape and size distribution is too complicated to practice material recycling. However, a proper separation method for ASR should be envisaged to promote the more efficient use of the components. In this study, investigations on the distribution of polypropylene contained in ASR and the agglomeration of the plastics with more of polypropylene and less chlorine content were carried out in order to make a solid fuel. The sink products of ASR separated by a zig-zag air separator were used as experimental samples. It was found from the FT/IR analysis that the ASR plastics in the range of −40+20 mm, that could float on tap water, were mainly polypropylene. The agglomeration tests were carried out on the float products of ASR over tap water and sawdust was used to adjust the calorific value of the solid fuel derived from ASR. When sawdust was mixed with the float products of ASR in the rate of 70%, the calorific value, ash content, chloride content and sulfur content of the agglomerated solid fuel were 24,330 kJ/kg, 5.5wt%, 0.17wt% and 0.10wt%, respectively. These values were almost in accordance with the established standards of an alternative fuel like RPF (Refuse Paper & Plastic Fuel) in a paper manufacturing company.