Europe is strengthening its critical raw materials supply chain with a pilot-scale demonstration of hydrometallurgical recycling for rare earth elements (REEs), essential components in permanent magnets for clean energy technologies and advanced electronics. The EU-funded HARMONY project has successfully transitioned a laboratory-scale process into a continuous pilot system capable of operating under industrial conditions.
Reported in January 2026, the pilot treated 42.5 kg of REE-containing slag using continuous leaching and selective precipitation. The system produced approximately 10 kg of rare earth oxalates with extraction efficiencies exceeding 90%, signaling a major step toward scalable recycling processes.
Unlike high-temperature methods, hydrometallurgy relies on aqueous chemistry to recover metals. In the HARMONY pilot, careful control of temperature, pH, and residence time ensured stable continuous operation, a critical milestone for industrial feasibility at larger scales.
The demonstration highlights Europe’s push to develop circular and sustainable raw material pathways that reduce dependency on imported primary rare earths. Neodymium-iron-boron (NdFeB) magnets, widely used in electric vehicle motors, wind turbines, and electronics, are currently sourced mainly from outside Europe. By recycling end-of-life magnets and other secondary REE sources, the HARMONY project strengthens supply security while minimizing the environmental impact of primary mining.
A Broader EU Circular Materials Initiative
HARMONY is part of a wider EU research cluster addressing critical raw materials and circularity. The project includes interconnected pilot studies covering:
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Collection and dismantling of waste electrical and electronic equipment (WEEE)
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Recovery of rare earth melts
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Production of recycled magnetic powders
These pilots aim for pre-commercial technology readiness, tackling technical, economic, and regulatory challenges in recycling complex waste streams.
Industrial and Strategic Implications
Project partners stress that the pilot’s success offers a practical pathway to continuous, scalable REE recycling, advancing Europe’s industrial autonomy in strategic materials. While full commercial deployment remains in the future, the data and insights from this pilot provide a foundation for industrial integration and future scale-up.
Beyond technical achievements, the HARMONY initiative supports the European Union’s circular economy goals, reduces pressure on global REE supply chains, and enables sustainable deployment of renewable energy and electric mobility technologies. By recovering high-value materials locally, Europe moves closer to strategic resilience in critical raw materials.
