Investigation of part detachment process from printed circuit boards for effective recycling using particle-based simulation

Yuki Tsunazawa, Chiharu Tokoro, Mitsuaki Matsuoka, Shuji Owada, Hiroyuki Tokuichi, Masamichi Oida, Hirobumi Ohta

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

For the establishment of appropriate recycling process, the delamination of electric components from printed circuit boards (PCBs), which are major components of e-waste, is expected, because some of useful critical metals are concentrated in specific components. However, the knowledge about the mechanism of the delamination process in a drum typed agitation mill is still limited and uncertain. To better comprehend the mechanism, in this study, the particle-based simulation and comminution tests using handmade PCBs were conducted. The behavior of PCBs and the air flow in the mill having flexible chains was simulated by the discrete element method (DEM) coupled with computational fluid dynamics (CFD). To model the shape of PCBs, the particle based rigid body model was introduced into the DEM. Since this model could not directly simulate the breakage phenomena, collision energy was calculated to qualitatively evaluate the comminution performance. In addition, the simulation results were compared with the experimental comminution tests. This study demonstrated the behavior of PCBs and the air flow in the mill, and the effect of the air to comminution process in the mill. It was also shown that the collision energy related to parts collision was better correlated with the experimental results and this correlation can be assumed using first order rate equation, which suggested part detachment was mainly brought by direct collision to parts in the mill.

Original languageEnglish
Pages (from-to)2146-2152
Number of pages7
JournalMaterials Transactions
Volume57
Issue number12
DOIs
Publication statusPublished - 2016

Keywords

  • Comminution
  • Computational fiuid dynamics
  • Discrete element simulation
  • E-waste
  • Recycling

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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