Can Rare Earth Metals Be Recycled?

Rare earth metals can be recycled. The more useful question is which ones are worth recycling, from where, and at what scale.

That distinction is moving from the laboratory into industrial policy. Britain this month announced a £50 million critical-minerals package covering extraction, processing and recycling, including support for rare earth magnet capacity. Reuters reported that the programme follows the launch of Mkango Resources’ HyProMag operation in Birmingham, described as Britain’s first commercial rare earth magnet plant in 25 years and one that uses recycled material to make magnets for electric motors and other technologies.

The push reflects a hard supply-chain reality. Rare earths are not rare in the geological sense, but they are difficult to separate, expensive to process and heavily concentrated in China’s refining and magnet-making system. Recycling is therefore being treated less as a green slogan and more as a strategic source of secondary supply.

The strongest recycling case sits with the magnet metals: neodymium, praseodymium, dysprosium and terbium. These elements are found in neodymium-iron-boron magnets used in electric vehicles, wind turbines, hard drives, robotics, speakers and defence equipment. The magnets are high-value, relatively concentrated and strategically important. They can be reused directly in some cases, processed into new magnet powder, or dissolved and separated through hydrometallurgical routes.

Neodymium is the main prize. It gives NdFeB magnets their power and is one of the most widely discussed rare earths in recycling research. Praseodymium often travels with it in magnet alloys and can be recovered through the same magnet-recycling stream. Dysprosium and terbium, used in smaller quantities to improve high-temperature magnet performance, are even more valuable in strategic terms because they are scarcer and more exposed to Chinese heavy-rare-earth processing. When an electric motor or wind turbine magnet is recycled properly, these four elements are the first targets.

Samarium also has a clear recycling route. It is used in samarium-cobalt magnets, which are valued in aerospace, defence and high-temperature industrial applications. Research has shown that hydrogen decrepitation can break SmCo magnets into powder for reuse in new magnets, giving samarium a plausible direct-recycling pathway where old magnets can be collected and identified.

The phosphor elements form a second group. Europium, yttrium and terbium were historically used in fluorescent lamps and display phosphors. ETH Zurich researchers have reported a method to recover europium from fluorescent lamp waste, highlighting how targeted chemistry can separate specific rare earths from old lighting products. Yttrium can also be recovered from phosphor-rich waste streams, while terbium sits in both the phosphor and magnet categories. The problem is that fluorescent lamps are declining as LEDs take over, so the available waste stream is not as strategically large as the magnet stream.

Lanthanum and cerium are recyclable, but economics are less attractive. Lanthanum appears in nickel-metal hydride batteries, catalysts and optical glass. Cerium is used in catalysts, glass polishing powders and chemical applications. Both can be recovered from industrial residues, spent catalysts, polishing slurries and battery waste, but they are usually lower-value light rare earths. That makes collection, acid use and separation costs harder to justify unless the waste stream is already concentrated.

Gadolinium is more complicated. It is used in medical imaging, specialty alloys and some magnetic applications. It can be recovered technically, but its uses are dispersed and often chemically complex. Recycling gadolinium is more likely to emerge from controlled industrial or medical waste streams than from consumer electronics.

Scandium is different again. It is used in aluminium alloys and solid oxide fuel cells, but it is not commonly recovered from consumer products. The more realistic recycling or secondary-production route is from industrial residues such as bauxite residue, titanium dioxide waste streams, nickel-cobalt processing residues or other metallurgical by-products. In that sense scandium recycling looks more like waste reprocessing than classic end-of-life electronics recycling.

Several rare earths are technically recyclable but commercially difficult because they are used in tiny volumes. Holmium, erbium, thulium, ytterbium and lutetium are found in lasers, optical fibres, medical devices, research equipment and specialist alloys. If they are present in a clean industrial stream, they can be recovered. But in normal consumer waste, they are too dilute and too scattered to justify large-scale recycling today.

Promethium is the outlier. It is radioactive, has no meaningful bulk commercial recycling stream and is not part of the practical rare earth recycling debate in the way neodymium, dysprosium or europium are.

That leaves the industry with a clear hierarchy. The most recyclable rare earths today are neodymium, praseodymium, dysprosium and terbium from permanent magnets; samarium from SmCo magnets; and europium and yttrium from phosphor-rich waste. Lanthanum and cerium can be recycled from batteries, catalysts and industrial residues, but lower prices make the economics harder. Scandium and the heavy niche rare earths are possible from concentrated industrial streams, not from general e-waste at scale.

The bottleneck is not chemistry alone. It is collection. A mine gives a processor a predictable ore body. A recycling plant must find old motors, hard drives, turbines, lamps, batteries or industrial slurries; identify the alloy or phosphor chemistry; remove coatings, steel, copper and plastics; and then produce material pure enough for demanding customers. Shredding mixed electronics can destroy value because the rare earths become diluted into a complex waste stream.

Policy is starting to respond. The European Union’s Critical Raw Materials Act sets a 2030 benchmark for EU recycling capacity to reach at least 25% of annual consumption of strategic raw materials and includes rules intended to improve recoverability of permanent magnets in products. The direction is clear: recycling is becoming part of the West’s critical-minerals security strategy.

For investors and governments, recycling is not a replacement for mining. Demand from electric vehicles, wind power, automation and defence is still growing, while many products containing today’s rare earth magnets will not reach end of life for years. But recycling can do something mining cannot: it can create a secondary supply chain inside consuming countries, reduce exposure to concentrated refining capacity and recover strategic metals already sitting in industrial equipment.

The answer, then, is yes: rare earth metals can be recycled. But the opportunity is uneven. The near-term commercial prize is not all 17 elements equally. It is magnets first, phosphors second, industrial residues third - and everything else only where the waste stream is clean, concentrated and worth the chemistry.