Japan's technological approach to recover minor rare metals from e-wastes

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Minor rare metals are essential to produce almost any kinds of electric and electronic appliances and the stable supply is of great importance for the manufacturers, because the deposits are quite limited to a few countries. Recycling of such metals is one of the strong methods.The Japanese government settled on recycling regulation in the cabinet and is trying to enforce it this April, in which minor rare metals, especially Ta, Nd, Dy, W, and Co, should be recycled from small domestic appliances (SDAs). However, novel technology is necessary to be developed because most of such metals are presently not recovered due to their low market values. Most of them are discarded into land fill sites and/ or distributed into the slags in non-recoverable state even when collected and fed to non-ferrous metals smelters. An important technology must be the separation of these metals from the SDAs before being charged to the non-ferrous metals smelters in which only heavy and precious metals, Cu, Au, Ag, Pt, etc., are recovered. -This paper introduces a technological approach to recover minor rare metals from scrap SDAs, which was carried out in several national projects managed by the Japan Oil, Gas and Metals National Corporation (JOGMEC). New concentration methods of such minor metals have been developed by combining novel crushing and various physical separation technologies. It was discovered in the project that the devices installed on the PCBs could be detached from the boards in non-distractive form by applying novel comminution. The following "Devices Separation" was considerably a good way to concentrate minor rare metals. In addition, the applicability of all the SDA bearing metals to the "Devices Separation" and conventional "Powder Separation" in the concentration process was demonstrated.

    Original languageEnglish
    Pages (from-to)154-160
    Number of pages7
    JournalWorld of Metallurgy - ERZMETALL
    Volume66
    Issue number3
    Publication statusPublished - 2013 May

    Fingerprint

    Metals
    metal
    Domestic appliances
    Nonferrous metals
    Recycling
    Bearings (structural)
    recycling
    Electronic Waste
    electronic waste
    Comminution
    comminution
    Polychlorinated Biphenyls
    precious metal
    Crushing
    Gas oils
    crushing
    Precious metals
    Heavy Metals
    slag
    Land fill

    Keywords

    • Concentration
    • E-waste
    • Minor rare metal
    • Technology

    ASJC Scopus subject areas

    • Geotechnical Engineering and Engineering Geology
    • Industrial and Manufacturing Engineering
    • Environmental Chemistry
    • Waste Management and Disposal

    Cite this

    Japan's technological approach to recover minor rare metals from e-wastes. / Owada, Shuji.

    In: World of Metallurgy - ERZMETALL, Vol. 66, No. 3, 05.2013, p. 154-160.

    Research output: Contribution to journalArticle

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