Investigation and Thermodynamic Consideration for Chlorination-Volatilization Behavior of Valuable Metals in Printed Circuit Board Wastes

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  • SHIBAYAMA Atsushi
    Graduate School of Engineering and Resource Science, Akita University Faculty of International Resource Science, Akita University
  • WATANABE Masahiro
    Former Student of Graduate School of Engineering and Resource Science, Akita University
  • HAGA Kazutoshi
    Graduate School of Engineering and Resource Science, Akita University
  • HOSOI Akira
    Graduate School of Engineering and Resource Science, Akita University
  • TAKASAKI Yasushi
    International Center for Research and Education on Mineral and Energy Resource, Akita University

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Other Title
  • 塩化揮発法を用いた廃電子基板中有価金属の回収と揮発挙動の熱力学的考察
  • エンカ キハツホウ オ モチイタ ハイデンシ キバン チュウウカ キンゾク ノ カイシュウ ト キハツ キョドウ ノ ネツ リキガクテキ コウサツ

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Description

For the recycling of valuable metals contained in the printed circuit board wastes (PCBW), the effect of temperature on chlorination-volatilization behavior of metals under valuable chlorine resource was investigated. For the experimental sample powder of two types PCBW: crushed PCBW and roasted PCBW was used. The samples were heated at predefined temperatures ranging from 300°C to 900°C with chlorine, argon gas atmosphere or CaCl2 as a solid chlorine source. Chlorine/Argon gas flow into furnace was set at a rate of 100 mL/min. As a result, most of metals in crushed PCBW did not volatilize regardless the temperature, argon gas atmosphere and CaCl2 as chlorine source. In contrast, in the Cl2 gas atmosphere, a lot of metals in crushed and/or roasted PCBW volatilized by raising temperature. Compering the experimental samples, volatilization rate of crushed PCBW is higher than roasted PCBW. This is considered to be influenced by the chemical composition of metals in the samples. When using the crushed PCBW, most metals were volatilized over 90% at 900°C. In addition, in 70% of volatilized metals that were recovered, Cu, Au, Ni were concentrated. According to the results, valuable metals could be recovered by chlorination volatilization from PCBW.

Journal

  • Resources Processing

    Resources Processing 61 (2), 90-99, 2014

    The Resources Processing Society of Japan

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