One-pot wet ball-milling for waste wire-harness recycling

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, we developed a one-pot wet ball-milling method for the recovery of highly pure copper wire, poly(vinyl chloride) (PVC) coating, and diisononyl phthalate (DINP) plasticizer from waste wire harnesses. n-Butyl acetate, acetone, or ethyl acetate was used as the solvent to simultaneously extract the DINP and separate the Cu and PVC, by swelling the PVC coating and physically impacting the cables with milling balls, achieving the whole process in one pot. The swelling ratios suggested the order of solvent power for PVC as n-butyl acetate > acetone > ethyl acetate at ~ 25 °C after 80-min submersion; while on increasing temperature, this order changed to acetone > n-butyl acetate > ethyl acetate. Due to the temperature rise induced by oblique ball-to-ball and ball-to-reactor collisions during milling, acetone exhibited the best separation efficiency, achieving complete separation of 20-cm-long cables in 40-min wet milling at 25 rpm, with the simultaneous, nearly quantitative recovery of DINP. Of the recovered Cu wires, nearly ~ 90% exceeded 10-cm lengths, which facilitated quantitative recovery in the separation step. Furthermore, 100% of the de-plasticized PVC was recovered, and ~ 85% of the solvent was regenerated by distillation for re-use.

Original languageEnglish
Pages (from-to)461-469
Number of pages9
JournalJournal of Material Cycles and Waste Management
Volume23
Issue number2
DOIs
Publication statusPublished - 2021 Mar

Keywords

  • High-purity Cu
  • PVC recovery
  • Waste wire harness
  • Wet ball milling

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Mechanics of Materials

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