Recycling of Rare Earth Magnet Scraps(2)Oxygen Removal by Calcium

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  • Suzuki Ryosuke O.
    Department of Energy Science and Technology, Kyoto University
  • Saguchi Akihiko
    Department of Energy Science and Technology, Kyoto University
  • Takahashi Wataru
    Electronics Materials & Science Research Department, Electronics Engineering Laboratories, Sumitomo Metal Industries, Ltd.
  • Yagura Takashi
    Department of Energy Science and Technology, Kyoto University
  • Ono Katsutoshi
    Department of Energy Science and Technology, Kyoto University

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タイトル別名
  • Recycling of Rare Earth Magnet Scraps: Part II Oxygen Removal by Calcium

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説明

Powder scraps of neodymium-iron-boron permanent magnet were deoxidized by using calcium vapor, liquid or CaCl2 melt at 1223–1273 K . Because the scraps react with the acidic solutions during leaching of the byproduct CaO, the methods for removal of the excess amount of Ca and CaO were studied. When pH was controlled at about 8 during several times leaching, the dissolution of rare earth elements could be minimized. Ca vapor deoxidation could not supply enough amount of Ca through CaO layer. When a large amount of CaCl2 was added, the dissolution rate of CaO into the aqueous solution became faster, but some amounts of rare earth components were lost. The deoxidation by Ca liquid and 5 mass%CaCl2 and the subsequent leaching in distilled water with pH>8 gave the better result so that oxygen, even in heavily oxidized scraps, could be lowered to 0.7 mass%.

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 42 (12), 2492-2498, 2001

    公益社団法人 日本金属学会

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