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

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

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

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
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

Flue Gas Exhaust

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

Magnetic Separation

Screening

Mechanical roll

crushing

Screening & sieving

Chemical Analyses

Screening, roll crushing schematic 1

SR

SR

ASR

ASR

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

Magnetic Separation

Screening

Mechanical roll

crushing

Screening & sieving

Chemical Analyses

Screening, roll crushing schematic 2

SR

SR

ASR

ASR

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

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

Conclusions
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