|Title||Materials recovery from end-of-life wind turbine magnets|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2021|
|Authors||Pietrantonio, Massimiliana, Pucciarmati Stefano, Sebastianelli L., Forte Federica, and Fontana Danilo|
|Journal||International Journal of Environmental Science and Technology|
|Keywords||Green energy technologies, Hydrometallurgical process, Industrial implementation, Iron Compounds, Iron hydroxides, Magnets, Materials recovery, Metal recovery, Nitric acid, Process flow-sheet, Rare earth oxide, Rare earths, Waste fraction, Wind turbines|
Neodymium–iron–boron permanent magnets are increasingly used in green energy technologies, such as wind turbines and electric vehicles. In the near future, an increasing amount of magnets will reach their end-of-life stage, andtherefore, it is imperative to develop proper recycling routes aimed at the valorization of this waste fraction. In this work, a room temperature hydrometallurgical process was developed aimed at the recovery of both iron and rare earths contained in end-of-life wind turbine magnets. The process is based on a leaching step with nitric acid, followed by two precipitation steps and calcination. Iron hydroxide(III) and rare earth oxide with purity grade equal to 98% and 99%, respectively, were obtained. Based on these results, a process flowsheet was proposed for industrial implementation. © 2021, Islamic Azad University (IAU).
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