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Information about forton2006hungary

Published on February 11, 2008

Author: Sibilla


Characterisation of rotary kiln residues from the pyrolysis of shredder wastes :  Characterisation of rotary kiln residues from the pyrolysis of shredder wastes Waste & Energy Research Group. Faculty of Science and Engineering. University of Brighton, UK Osric Tening Forton Marie K. Harder Norman R. Moles Slide2:  Presentation Outline UK shredder waste volumes – landfill disposal is unsustainable Key Drivers ~ ELV Directive (2000/53/EC): maximum recovery! Aims and objectives of this work: -Maximize materials recovery from the inerts -Which metals present and at what levels? -Identify contribution of automotive feed Results & Discussions Major conclusions Slide3:  Waste characteristics & recovery options Complex & heterogeneous waste stream -Depends on several factors Plastics - highest proportion by mass Waste is amenable to : Mechanical treatment e.g. SiCoN process Thermo chemical treatment e.g. pyrolysis MIDDLES (15 – 130mm) Fines (<15mm) OVERSIZE (>130mm) Aims and Objectives:  Characterise of solid residues from the pyrolysis of ASR & SR Presence of residual metals and contaminants - Cu, Zn and Fe – potential for further recovery from residues? Pb – major contaminant and limiting factor for reuse options Evaluate/Use the performance of a mechanical roll crushing process to fractionate metals for recovery and disposal Aims and Objectives Slide5:  Kiln type – MRP Rotary Kiln Unit Feedstock, ASR & SR fines (<15mm) Feed rate- ~1kg/min Temperature - 600oC Experimental Design & feed characteristics Residence time - 12min Liquids condensed Exhaust gases passed through bag filters Solid residues collected and processed Screening, roll crushing schematic 1:  Screening, roll crushing schematic 1 ASR SR ASR SR Analytical Techniques and Sample preparation:  Analytical Techniques and Sample preparation Heterogeneous nature of solid residues (particle size, composition) 4 analytical techniques used Each have their specificities Fitness For Purpose approach Screening, roll crushing schematic 2:  Screening, roll crushing schematic 2 ASR SR ASR SR Results – particle size distribution & Carbon Content:  Results – particle size distribution & Carbon Content 50 - 60% solid residues -Average Carbon Content (LOI @ 550oC) - ASR – 17% - SR – 23% Screening & Roll crushing concentrates residues in different particle sizes -largest proportion of residues in <500µm Does this have an effect on metal partitioning & segregation? -changes in aspect ratio Pb fractionation by particle size:  Pb fractionation by particle size Cu fractionation by particle size:  Cu fractionation by particle size Zn fractionation by particle size:  Zn fractionation by particle size Fe fractionation by particle size:  Fe fractionation by particle size Summary:  Summary Conclusions:  Conclusions Pyrolysis is useful in the characterisation of shredder wastes Pyrolysis (commercial) is useful for material recovery towards ELV Directive targets Inerts contain useful metals (Cu, Zn, Fe) and contaminants (Pb) Lead levels in SR residues are ~double ASR residues Implications for sustainable waste management? Implications for automotive industry? Mechanical roll crushing and separation concentrates metals and contaminants into some fractions. leaves most of the inerts less contaminated – reusable? Pb concentration for re use or disposal Possible Fe, Zn and Cu recovery for secondary markets Value from shredder wastes pyrolytic solid residues Suitable markets with product specifications must be identified Collation of larger datasets for more rigorous statistical analyses

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