Validation of a deplasticizer–ball milling method for separating Cu and PVC from thin electric cables: A simulation and experimental approach

Jing Xu, Jiaqi Lu, Shogo Kumagai, Tomohito Kameda, Yuko Saito, Kenshi Takahashi, Hiroshi Hayashi, Toshiaki Yoshioka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

There is increasing demand in the electronics recycling industry for an effective method to separate polyvinyl chloride (PVC) and Cu from thin electric cable waste. Herein, a novel separation technique involving PVC embrittlement via plasticizer extraction and crushing by ball milling is proposed. The method was developed by varying the size, quantity, and hardness of the cables, as well as the size and quantity of the milling balls, to determine a combination that resulted in complete separation of PVC and high-purity Cu (>99.9%) from thin electric cables. The experimental crushing behavior was demonstrated via a sphere-to-cylinder discrete element model combined with a statistical approach. The mechanism of PVC crushing generated cracks from the edge to the center of the cable via ball impacts that were strong enough to overcome the elastic repulsion force of the PVC. The resulting method was found to be effective at separating PVC and high-purity Cu (>99.9%) from de-plasticized thin electric cables with diameters of 1.5–2.7 mm.

Original languageEnglish
Pages (from-to)220-230
Number of pages11
JournalWaste Management
Volume82
DOIs
Publication statusPublished - 2018 Dec

Keywords

  • Ball milling
  • Cable recycling
  • Copper
  • DEM simulation
  • Impact energy
  • Polyvinyl chloride

ASJC Scopus subject areas

  • Waste Management and Disposal

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