Journal of MMIJ (Dec 2023)

Investigation of Liberation Mechanism of Electronic Scrap by Impact Energy Measurements and DEM Simulations

  • Takuya TATSUMOTO,
  • Yuki TSUNAZAWA,
  • Taketoshi KOITA,
  • Yutaro TAKAYA,
  • Keishi OYAMA,
  • Chiharu TOKORO

DOI
https://doi.org/10.2473/journalofmmij.139.52
Journal volume & issue
Vol. 139, no. 11_12
pp. 52 – 62

Abstract

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To clarify the mechanism of liberation in the comminution process of electronic scrap (e-scrap), we attempted to express the degree of liberation by first-order kinetic equation related to impact energy. Breakage energy measurements, comminution experiments, and discrete element method (DEM) simulations were conducted on two types of e-scrap with relatively simple structures. The mechanism of the liberation was estimated from the observation of the fractions in the comminution experiments. The results of the breakage energy measurements and DEM simulations supported the mechanism in terms of impact energy. The results of fitting first-order kinetic equations based on the cumulative specific impact energy from the DEM simulations and the degree of liberation in the experiments showed a high correlation. The fitting parameters of the firstorder kinetic equations were compared confirmed to be consistent with the mechanism of liberation and the breakage energy measurements, suggesting the numerical validity of the equations. In conclusion, it was shown that for e-scrap with relatively simple structures, the first-order kinetic equations of the cumulative specific impact energy calculated by DEM simulations can be used to evaluate the degree of liberation.

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