Evaluation of concentrating behaviors of various metals in the comminution and physical separation process of E-waste

Hiroto Ogawa, Hideaki Umezawa, Tomohiro Takahashi, Shuji Owada

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The devices which are mounted on printed circuit boards (PCBs) include many kinds of precious and minor rare metals. The past research works in our laboratory showed that it was possible to concentrate these metals from wasted cellular phones and PCBs by combining novel comminution and conventional physical separation methods. In this paper, we have analyzed more in detail our past results of comminution and physical separation behaviors for the products comminuted with various crushers and crushing conditions. Through this analysis, detailed characteristics of the crushers were investigated and the major concentration stage(s) (screening, physical separation such as low/high magnetic separation, electrostatic / eddy current separation) of metals were determined in the flowchart by using three kinds of indices. It has been found that the components, Ta, Pd, and W, which were involved in a few specific devices, could be concentrated with relative ease in the physical separation stages for the products comminuted with "separation type" crushers and that the other components, which were distributed in lots of devices, showed a good concentration performance for the products with "semi-distraction type" crushers because of their higher liberation.

    Original languageEnglish
    Title of host publicationEARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology
    PublisherInternational Symposium on East Asian Resources Recycling Technology
    Pages715-720
    Number of pages6
    Publication statusPublished - 2015
    Event13th International Symposium on East Asian Resources Recycling Technology, EARTH 2015 - Pattaya, Thailand
    Duration: 2015 Nov 12015 Nov 4

    Other

    Other13th International Symposium on East Asian Resources Recycling Technology, EARTH 2015
    CountryThailand
    CityPattaya
    Period15/11/115/11/4

    Keywords

    • Crushing
    • Minor rare metal
    • Physical separation
    • Separation efficiency
    • WEEE

    ASJC Scopus subject areas

    • Environmental Science(all)

    Fingerprint Dive into the research topics of 'Evaluation of concentrating behaviors of various metals in the comminution and physical separation process of E-waste'. Together they form a unique fingerprint.

  • Cite this

    Ogawa, H., Umezawa, H., Takahashi, T., & Owada, S. (2015). Evaluation of concentrating behaviors of various metals in the comminution and physical separation process of E-waste. In EARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology (pp. 715-720). International Symposium on East Asian Resources Recycling Technology.