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Recycling of Rare Earth Magnet Scraps : Part II Oxygen Removal by Calcium
| Title: | Recycling of Rare Earth Magnet Scraps : Part II Oxygen Removal by Calcium |
| Authors: | Suzuki, Ryosuke O. Browse this author →KAKEN DB | | Saguchi, Akihiko Browse this author | | Takahashi, Wataru Browse this author | | Yagura, Takashi Browse this author | | Ono, Katsutoshi Browse this author |
| Keywords: | recycling of magnet | | magnet scraps | | thermodynamics of deoxidation | | calcium deoxidation | | calcium halide flux deoxidation | | calcium oxide removal |
| Issue Date: | Dec-2001 |
| Publisher: | The Japan Institute of Metals |
| Journal Title: | MATERIALS TRANSACTIONS |
| Volume: | 42 |
| Issue: | 12 |
| Start Page: | 2492 |
| End Page: | 2498 |
| Publisher DOI: | 10.2320/matertrans.42.2492 |
| Abstract: | 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%. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/74879 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 鈴木 亮輔
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