Rare Earth Separation and Refining Capacity: The Supply Bottleneck
Rare earth separation is the supply chain's main bottleneck. Mines exist in many countries, but turning mixed concentrate into individual oxides takes specialist plants, and China accounts for around 90% of global rare earth refining, according to the IEA.
How Separation Works, in Brief
Separation plants use solvent extraction for most volume and ion exchange for some heavy rare earths and ionic clay feed. Both processes are capital intensive and generate chemical waste, which is why new capacity is slow to build. The step-by-step chemistry is covered in rare earth separation explained; this page focuses on capacity, concentration and what it means for investors.
Separation Capacity Outside China
- Operating: Lynas (Malaysia), MP Materials (California), Energy Fuels (Utah), Neo Performance Materials (Estonia) and Solvay (France).
- Under construction: Iluka (Eneabba, Australia, planned for 2027), Ucore (Louisiana, first line estimated for 2027) and Arafura (Nolans, Australia, final investment decision in 2026).
- Heavy rare earths: Lynas has produced separated dysprosium and terbium since 2025; MP Materials and Energy Fuels plan commercial heavy rare earth circuits.
Company details are in the separation and processing stocks table.
Why New Capacity Is Slow
- Complex chemistry. Rare earths behave almost identically, so separating them takes long cascades of extraction stages.
- Skills. Most experienced operators and engineers are in China, and China bans the export of separation technology.
- Permitting and waste. Plants handle acids, solvents and radioactive thorium residues, which require careful approvals.
- Ramp-up. New plants commonly take years to reach design output and purity.
- Price risk. Chinese price swings can make new plants uneconomic, which is why price floors and offtakes matter.
What It Means for Investors
Separation capacity outside China is scarce, so companies that operate it carry strategic value and attract government support. The same scarcity means investors should treat announced start dates with caution and watch for evidence of plants reaching design output.
Separation and Refining FAQ
Who controls rare earth separation?
China controls rare earth separation, with around 90% of global refining according to the IEA. Outside China, Lynas in Malaysia and MP Materials in California are the largest separators, with several more plants under construction.
Why does it take so long to build a rare earth separation plant?
Rare earth separation plants take years to build because they need complex chemistry with hundreds of extraction stages, specialist operators, environmental permits for radioactive and chemical waste, and long ramp-ups to reach design output and purity.
Can rare earth separation technology be bought from China?
No. China has banned the export of rare earth extraction, separation and magnet-making technology since 2023, so companies outside China must develop or license technology elsewhere.