熱処理と磁力選別を利用したプリント基板からのニッケル濃縮と含有金属成分の挙動  [in Japanese] Nickel Recovery from Printed Circuit Board and Distribution of Other Elements by Heat Treatment and Magnetic Separation  [in Japanese]

Access this Article

Search this Article

Author(s)

    • 小野 浩之 ONO Hiroyuki
    • 東京大学大学院 工学系研究科 システム創成学専攻 Department of Systems Innovation, Graduate School of Engineering, the University of Tokyo
    • 定木 淳 [他] SADAKI Jun
    • 東京大学大学院 工学系研究科 システム創成学専攻 Department of Systems Innovation, Graduate School of Engineering, the University of Tokyo
    • 藤田 豊久 FUJITA Toyohisa
    • 東京大学大学院 工学系研究科 システム創成学専攻 Department of Systems Innovation, Graduate School of Engineering, the University of Tokyo

Abstract

In an attempt to recover nickel and remove unnecessary elements during the copper smelting, crushed waste Printed Circuit Board (PCB) was treated by means of heat treatment and magnetic separation. Many multi-layered ceramic capacitors (MLCCs) including nickel have been mounted on PCB. Some MLCCs would be concentrated among the relatively small particles of crushed PCB, whereas others wouldn't be stripped from main board because MLCC has been downsized. In the first experiment, PCB without mounted parts excluding MLCC was treated in a nitrogen atmosphere at temperature, ranging from 773 to 973K, while the residue was magnetically separated. Nickel was concentrated in magnetics, whereas copper was mainly collected in non-magnetics. Nickel grade in magnetics was higher at relative high temperature. When the magnetic separation (magnetic field strength of 0.1T) was carried out after the sample was heated at 873K and screened with a 4mm screen, the nickel grade was enhanced from 0.16% to 6.7%, recovering 74% of feed. Copper loss, on the other hand, in magnetics was less than 1%. 82% of lead and 92% of tin were separated from non-magnetics of over 4mm in size. In the second experiment, crushed PCB with the size under 4mm was magnetically separated. Most nickel was collected into magnetics, which contains also a small amount of gold. In addition, some lead parts made of copper, nickel, tin and zinc plated with gold were also collected as magnetics. Heat treatment and magnetic separation were conducted for magnetics to separate gold from magnetics after separating lead parts. The magnetic fraction of 2 to 4mm in size, which was collected by magnetic separation (magnetic field strength of 0.1T) , after the sample was heated in the air atmosphere at 873K, had a nickel grade of 6.9%, whereas the gold loss was less than 1%. 82% of iron and nickel was separated as magnetics.

Journal

  • Journal of MMIJ

    Journal of MMIJ 127(9), 584-591, 2011-08-25

    The Mining and Materials Processing Institute of Japan

References:  15

  • <no title>

    Research and Statistics Department Economic and Industrial Policy Bureau Ministry of Economy Trade and Industry (METI)

    Yearbook of Machinery Statistics 258, 2008

    Cited by (1)

  • <no title>

    ONO H.

    Journal of MMIJ 127, 519-525, 2011

    Cited by (1)

  • <no title>

    MATSUDA Y.

    Capacitor Binran, 2009

    Cited by (1)

  • <no title>

    HU Bo

    Journal of MMIJ 109, 367-372, 1993

    Cited by (1)

  • <no title>

    SAKUTA K.

    Proc. MMIJ Annual Meeting, 1999 I, 159-160, 1999

    Cited by (1)

  • <no title>

    VEIT Hugo Marcelo

    Journal of Hazardous Materials, B 137, 1704-1709, 2006

    Cited by (1)

  • <no title>

    SHIBAYAMA A.

    Proc. MMIJ Annual Meeting, 2000 II, 105-108, 2000

    Cited by (1)

  • <no title>

    KIM Eun-young

    Hydrometallurgy 86, 89-95, 2007

    Cited by (1)

  • <no title>

    OWADA S.

    Proc. MMIJ Annual Meeting, 2010 II, 153-156, 2010

    Cited by (1)

  • <no title>

    YOKOYAMA S.

    Japan Patent 2908440, 1999

    Cited by (1)

  • <no title>

    KUBASCHEWSKI O.

    Metallurgical thermochemistry, 1979

    Cited by (1)

  • <no title>

    NOMURA K.

    Kobe Steel Engineering Reports 54(1), 13-18, 2004

    Cited by (1)

  • <no title>

    FURUKAWA ELECTRIC CO. LTD

    http://www.furukawa.co.jp

    Cited by (1)

  • <no title>

    Sumitomo Electric industries Ltd

    http://www.sei.co.jp

    Cited by (1)

  • <ICMR2009 AKITA>Copper Recovery from Printed Circuit Board by Carbonization

    ONO H. , DODBIBA Gjergj , FUJITA Toyohisa

    International Journal of the Society of Materials Engineering for Resources 17, 53-57, 2010

    Cited by (1)

Codes

  • NII Article ID (NAID)
    10029494719
  • NII NACSIS-CAT ID (NCID)
    AA12188381
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    18816118
  • NDL Article ID
    11221073
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-315
  • Data Source
    CJP  NDL  J-STAGE 
Page Top