Used Phone Flakes Kinetics during High-speed Cutting Mill Crushing with Flat Blades

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  • Anezaki Shoji
    Graduate School of Human Sciences, Osaka University (Now at Global Collaboration Center, Osaka University)
  • Yamamoto Takaiku
    Graduate School of Engineering, Osaka University (Now at Graduate School of Engineering, Kyoto University)
  • Miyoshi Emako
    Graduate School of Human Sciences, Osaka University

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  • 水平ブレード式高速カッティングミルによる1次破砕後の使用済み携帯電話砕片の乾式粉砕過程に関する実験的検討
  • スイヘイ ブレードシキ コウソク カッティングミル ニ ヨル 1ジ ハサイ ゴ ノ シヨウ ズミ ケイタイ デンワ サイヘン ノ カンシキ フンサイ カテイ ニ カンスル ジッケンテキ ケントウ

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This study was undertaken to clarify kinetic phenomena during crushing of used phone flakes using a batch-type high-speed cutting mill with flat blades. We adopted a screen mill converted for the continuous separation of pulverized smaller products. Results show that the flake comminution rate depends on a first-order reaction similar to a chemical process. We observed dynamic behavior with a constant relation between crush weight ratios less than 2 mm and energy consumption added to the vessel, similarly to hydrodynamics in a wing-type stirrer.<br>Results suggest that grinding and friction derived from particle collision during circulating flow influence pulverization properties. Moreover, a screen separator seems to be unsuitable for separation of precious metals during crushing of phone flakes.

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