Recycling of Rare Earth Magnet Waste by Removing Rare Earth Oxide with Molten Fluoride
Recycling of Rare Earth Magnet Waste by Removing Rare Earth Oxide with Molten Fluoride
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DOI：
10.2320/matertrans.m-m2013836
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发表时间：
2014-02
影响因子：
1.2
通讯作者：
O. Takeda;Kiyotaka Nakano;Y. Sato
中科院分区：
文献类型：
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作者：
O. Takeda;Kiyotaka Nakano;Y. Sato
回收稀土磁铁废料是提高资源节约的需要。为了开发新的回收工艺，采用LiF = 50mol%NdF3和LiF = 25mol%NdF3 = 25mol%DyF3为助熔剂，在1503 K下对不合格废磁铁合金中的稀土氧化物进行重熔。其结果是，再熔后磁铁合金与氟化物助熔剂的分离良好，既没有观察到合金在助熔剂中的悬浮，也没有观察到助熔剂在合金中的悬浮。通过加入1.5倍当量的熔剂，使合金中的氧浓度从5000质量ppm降至160质量ppm，使氧化物完全溶解。观察到合金中的钕和熔剂中的镝被取代。研究过程中，应利用轻度污染的废物，如使用（寿命结束）磁铁，因为简单的过程，节能和无限的位置。[doi：10.2320/材料trans.M-M2013836]
Recycling of rare earth magnet scrap is required for improving resource conservation. Removal of rare earth oxide from off-specification magnet alloy scrap was investigated by remelting the scrap together with fluoride flux, LiF50mol% NdF3 and LiF25mol% NdF325mol% DyF3, at 1503K for the development of novel recycling process. As a result, separation of magnet alloy from fluoride flux after remelting was fine, and neither suspension of alloy in the flux nor suspension of flux in the alloy was observed. Oxygen concentration of alloy decreased from 5000 to 160mass-ppm by charging flux of 1.5 times of equivalent amount for complete dissolution of oxide. Substitution of neodymium in the alloy and dysprosium in the flux was observed. The investigated process should be utilized for mildly contaminated waste such as a used (endof-life) magnet because of simple process, energy saving and unlimited location. [doi:10.2320/matertrans.M-M2013836]