Rare earth permanent magnets for the green energy transition: Bottlenecks, current developments and cleaner production solutions

<p>The paper explores the crucial role that rare earth metals (REMs) play in the production of high-performance permanent magnets, which are key components in clean energy technologies, particularly wind turbines and electric vehicles. However, the limited availability of these metals and the environmental challenges posed by their mining, processing, and purification present significant obstacles to the green energy transition.</p> <p>The paper first outlines the magnetic properties and development history of permanent magnets, focusing on their current use in clean energy applications. It discusses the specific requirements for REM-based magnets in technologies such as wind turbines and electric vehicles, emphasising the increasing demand and potential supply chain issues.</p> <p>The main challenges, or bottlenecks, identified in the paper include:</p> <ol> <li><strong>Geographical concentration</strong> of rare earth oxide (REO) production and supply chain dependencies.</li> <li><strong>Environmental concerns</strong>, such as waste, toxicity, and the energy-intensive nature of rare earth processing.</li> <li><strong>Market volatility</strong> and geopolitical factors that impact supply and demand.</li> <li><strong>Performance limitations</strong> of the magnets, including temperature stability and corrosion resistance.</li> </ol> <p>In response to these challenges, the paper highlights ongoing developments and potential solutions aimed at improving the sustainability and security of REM supply. This includes advancements in cleaner production methods, recycling, and innovations in magnet performance.</p> <p>The paper provides valuable insights into the future direction of research and policy needed to ensure that REM-based permanent magnets can continue to support the green energy transition sustainably and securely.</p>