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- W2527255492 abstract "We developed a new and environmentally friendly approach for recycling Ni–Cu-coated Nd–Fe–B permanent magnets included in computer hard disk drives collected as the waste of electrical and electronic equipment (WEEE). In a closed reactor, the coated magnets are heated at 250 °C in water mixed with sodium chloride for up to 18 h. First, the hydrothermal treatment induces the removal of the metallic coating that can be recovered by sieving. Then, the Nd-rich phase reacts with water, leading to the formation of Nd(OH)3. Atomic hydrogen is absorbed by the Nd2Fe14B phase, leading to the formation of Nd2Fe14BHx. The volume expansion of the intergranular phase, in relation to the formation of Nd(OH)3, together with the lattice expansion of the Nd2Fe14BHx phase causes the disintegration of the magnets. Finally, Nd2Fe14BHx is oxidized by water into Fe3O4 and Nd(OH)3. The Nd(OH)3 crystals can be isolated from the Fe3O4 crystals by magnetic separation. This process is thus an easy way to extract rare earths from permanent magnets found in WEEE. It uses green chemistry design principles and can be applied to large amounts of magnetic wastes." @default.
- W2527255492 created "2016-10-07" @default.
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- W2527255492 date "2016-09-27" @default.
- W2527255492 modified "2023-10-17" @default.
- W2527255492 title "An Innovative Process Using Only Water and Sodium Chloride for Recovering Rare Earth Elements from Nd–Fe–B Permanent Magnets Found in the Waste of Electrical and Electronic Equipment" @default.
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- W2527255492 doi "https://doi.org/10.1021/acssuschemeng.6b01226" @default.
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