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

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  • TATSUMOTO Takuya
    Assistant Manager, Technical Development Department, Matsuda Sangyo Co., Ltd. Doctor student, Graduate School of Creative Science and Engineering, Waseda University.
  • TSUNAZAWA Yuki
    Senior researcher Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST) Adjunct Researcher, Faculty of Science and Engineering, Waseda University.
  • KOITA Taketoshi
    Lecturer, Faculty of Science and Engineering, Waseda University
  • TAKAYA Yutaro
    Adjunct Researcher, Faculty of Science and Engineering, Waseda University. Associate professor, Faculty of Engineering, The University of Tokyo.
  • OYAMA Keishi
    Lecturer, Faculty of Science and Engineering, Waseda University
  • TOKORO Chiharu
    Professor, Faculty of Science and Engineering, Waseda University. Professor , Faculty of Engineering, The University of Tokyo.

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Other Title
  • 衝撃試験とD E M シミュレーションによる電子スクラップの単体分離機構の考察
  • ショウゲキ シケン ト DEM シミュレーション ニ ヨル デンシ スクラップ ノ タンタイ ブンリ キコウ ノ コウサツ

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Abstract

<p>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.</p>

Journal

  • Journal of MMIJ

    Journal of MMIJ 139 (11_12), 52-62, 2023-12-29

    The Mining and Materials Processing Institute of Japan

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