A Fundamental Study of Dry Gravity Concentration Method Using Fluidized Bed

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  • TOKORO Chiharu
    Department of Resources and Environmental Engineering, School of Science and Engineering, Waseda University
  • OKAYA Katsunori
    Department of Geosystem Engineering, Graduate School of Engineering, The University of Tokyo
  • SADAKI Jun
    Department of Geosystem Engineering, Graduate School of Engineering, The University of Tokyo
  • SHIBAYAMA Atsushi
    Faculty of Engineering and Resource Science, Akita University
  • LIU Kejun
    Department of Geosystem Engineering, Graduate School of Engineering, The University of Tokyo
  • FUJITA Toyohisa
    Department of Geosystem Engineering, Graduate School of Engineering, The University of Tokyo

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Other Title
  • 流動層を用いた乾式比重分離法に関する基礎的研究
  • リュウドウソウ オ モチイタ カンシキ ヒジュウ ブンリホウ ニ カンスル キソテキ ケンキュウ

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Abstract

Dry gravity concentration method using a fluidized bed is being investigated. We employ polystyrene (PS) balls and glass beads (GB) as a fluidizing medium. Pieces of corrugated cardboard, paulownia wood, polypropylene (PP), polyvinyl chloride (PVC) and Al are employed as test materials. The separation efficiency is experimented and vertical position of separated materials in the fluidization bed is simulated, by changing the superficial velocity. It is found by experiment that high recovery (>90%) of sink products and float products is achieved, even if the density difference between them is slight. These high recoveries are achievable when the superficial velocity is slightly higher than the minimum fluidization velocity.<BR>The recovery of float products is found to be sensitive to the superficial velocity: i.e., the recovery is low when the superficial velocity is either too high or too low. In order to examine the influence of the superficial velocity on the recovery of float products in detail, we employ two-dimensional simulation based on the discrete element method (DEM). The grater the superficial velocity is, the wider the vertical positioning of float materials becomes. It is found by DEM simulation that the recovery of float products tends to be low when the superficial velocity is too high, because the lowest vertical position during separation test is lower than that when the superficial velocity is optimal.<BR>It is found from these series of experiments and simulation in this study that high efficient separation by dry gravity concentration using a fluidized bed is possible.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 120 (6/7), 388-394, 2004

    The Mining and Materials Processing Institute of Japan

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