Characterisation of rotary kiln residues from the pyrolysis of shredder wastes
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Characterisation of rotary kiln residues from the pyrolysis of shredder wastes. Osric Tening Forton Marie K. Harder Norman R. Moles. Waste & Energy Research Group. Faculty of Science and Engineering. University of Brighton, UK. Presentation Outline.

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Characterisation of rotary kiln residues from the pyrolysis of shredder wastes l.jpg

Characterisation of rotary kiln residues from the pyrolysis of shredder wastes

Osric Tening Forton

Marie K. Harder

Norman R. Moles

Waste & Energy Research Group. Faculty of Science and Engineering. University of Brighton, UK


Slide2 l.jpg

Presentation Outline of shredder wastes

  • 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 l.jpg

    Waste characteristics & recovery options of shredder wastes

    MIDDLES (15 – 130mm)

    OVERSIZE (>130mm)

    • 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

  • Fines (<15mm)


    Aims and objectives l.jpg

    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

    +GASEOUS PRODUCTS

    Widely studied

    GENERAL PYROLYSIS

    +LIQUID PRODUCTS

    +SOLID RESIDUES

    Limited attention

    Aims and Objectives


    Slide5 l.jpg

    Flue Gas Exhaust SR

    Thermocouple

    Chain drive

    Combustion chamber

    Gas fired furnace

    and Bag Filters

    Feed

    S.R. plug

    Char and metals

    600°C

    700°C

    Condenser

    BURNER

    Experimental Design & feed characteristics

    • Residence time - 12min

    • Liquids condensed

    • Exhaust gases passed through bag

    • filters

    • Solid residues collected and processed

    Kiln type – MRP Rotary Kiln Unit

    • Feedstock, ASR & SR fines (<15mm)

      • Feed rate- ~1kg/min

    • Temperature - 600oC


    Screening roll crushing schematic 1 l.jpg

    Magnetic Separation SR

    Screening

    Mechanical roll

    crushing

    Screening & sieving

    Chemical Analyses

    Screening, roll crushing schematic 1

    SR

    SR

    ASR

    ASR


    Analytical techniques and sample preparation l.jpg
    Analytical Techniques and Sample preparation SR

    • 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 l.jpg

    Magnetic Separation SR

    Screening

    Mechanical roll

    crushing

    Screening & sieving

    Chemical Analyses

    Screening, roll crushing schematic 2

    SR

    SR

    ASR

    ASR


    Results particle size distribution carbon content l.jpg
    Results – particle size distribution & Carbon Content SR

    • 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







    Conclusions l.jpg

    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

    Conclusions