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Upgrading mixed polyolefin waste with magnetic density separation.

E J Bakker1, P C Rem, N Fraunholcz

  • 1Resource Engineering, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands. E.J.Bakker@TUDelft.nl

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Recycling end-of-life polyolefins like polypropylene (PP) and polyethylene (PE) requires high purity. An inverse magnetic density separator (IMDS) shows promise for effectively separating these plastics from shredder residue.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Recycling end-of-life consumer products generates polyolefin fractions, primarily mixtures of polypropylene (PP) and polyethylene (PE).
  • High purity (over 97%) is essential for reusing these polyolefins as high-quality products.
  • Current recycling methods face challenges in achieving the required purity for mixed polyolefin streams.

Purpose of the Study:

  • To investigate the potential of shredder residue as a source for polyolefin recycling.
  • To evaluate the effectiveness of the inverse magnetic density separator (IMDS) technique for separating PP and PE mixtures.
  • To assess the economic viability of using IMDS in polyolefin recycling.

Main Methods:

  • Utilizing shredder residue, a polyolefin waste stream, as feedstock.
  • Employing a prototype inverse magnetic density separator (IMDS) for density-based separation.
  • Conducting experiments to determine separation efficiency, grade, and recovery rates.

Main Results:

  • Experiments demonstrated high-grade separation of polyolefins using the IMDS prototype.
  • The IMDS achieved high recovery rates for the separated polyolefins.
  • Shredder residue was confirmed as a viable source material for this separation technique.

Conclusions:

  • The inverse magnetic density separator (IMDS) is a promising technology for achieving high-purity polyolefin separation from mixed waste streams.
  • IMDS offers significant economic opportunities for enhancing polyolefin recycling processes.
  • Effective separation of PP and PE from sources like shredder residue can improve the circular economy for plastics.