Insights › Rare-earth magnet supply chain atlas › Solvay — Special Chem (Rare Earths), La Rochelle
France (plant); Belgium (group headquarters)
Solvay — Special Chem (Rare Earths), La Rochelle
Rare-earth oxide separation (not a magnet, alloy, or metal producer); supplies separated oxides, including samarium and magnet-grade neodymium-praseodymium, to downstream metallizers and magnet makers.
At a glance
- Founded
- 1948 — Rare-earth separation at the La Rochelle site dates to 1948, operated through a chain of ownership from Rhône-Poulenc to Rhodia to Solvay. Solvay demerged from Syensqo in December 2023, retaining the rare-earths business.
- Headquarters
- La Rochelle, France (plant); Brussels, Belgium (group headquarters)
- Ownership
- Publicly listed (Euronext Brussels/Paris: SOLB); demerged from Syensqo in December 2023.
- Revenue
- €4.262 billion
Reported, FY2025.
No rare-earth-specific revenue figure is disclosed; the group and Special Chem segment figures are not rare-earth-only.
Source
Capacity
Each date below links to the document the figure came from. A capacity figure with no source is not on this page.
| What | Figure | Status | As of |
|---|---|---|---|
| Rare earth-based formulation products (broad, not magnet-grade-specific) | approximately 4,000 t/yr | Operating | 2022 |
| Magnet-grade NdPr separation line | not disclosed by Solvay (a third-party trade-press estimate places output at a few hundred tons per year) | Operating | Apr 2025 |
| Samarium oxide separation | not disclosed | Operating | 2025 |
| Heavy rare-earth (dysprosium/terbium) separation line | €15–20 million investment approved | Under construction | Jul 2026 |
Narrative
Solvay operates a rare-earth separation business at La Rochelle, France, with roots dating to 1948 under a chain of ownership running from Rhône-Poulenc through Rhodia to Solvay; Solvay demerged from Syensqo in December 2023 and retained the rare-earths business. The La Rochelle site separates rare-earth oxides rather than producing magnet alloy, metal, or finished magnets, and supplies separated oxides to downstream metallizers and magnet makers. Under a three-way commercial agreement announced in November 2025, Solvay separates samarium oxide that is metallized by Less Common Metals and then made into magnets by Permag. The site has approximately 4,000 tons per year of broad rare earth-based formulation capacity as of 2022, not specific to magnet-grade material, plus a magnet-grade neodymium-praseodymium separation line that began operating in April 2025; Solvay has not disclosed tonnage for this line, though trade press has estimated output at a few hundred tons annually. Samarium oxide separation began in 2025. In July 2026, Solvay approved a €15–20 million investment in a heavy rare-earth (dysprosium and terbium) separation line, targeted to begin operating in autumn 2026. Solvay does not disclose a rare-earth-specific revenue figure; FY2025 group-wide underlying net sales of €4.262 billion are provided here only as context and are not attributable to the rare-earths business alone. As of September 2026, unconfirmed, single-sourced reporting has described talks between Solvay and OneIM regarding a possible strategic partnership or investment in the La Rochelle rare-earths business; no agreement has been confirmed.
Where public sources disagree
- Investment-figure estimates for the magnet-grade NdPr line vary across secondary sources and are not fully reconciled.
- Broader 2030 capex target estimates for the rare-earths business range from over €100 million to €50–100 million in different secondary sources, distinct from the confirmed €15–20 million heavy rare-earth line investment.
- The NdPr line's tonnage output is a trade-press estimate, not a Solvay-disclosed figure.
- The heavy rare-earth line's targeted start date is described variously as "autumn 2026" and "targeted for September 2026" across sources.
- As of September 2026, a single-sourced report describes unconfirmed talks between Solvay and OneIM regarding a possible strategic partnership or investment in the La Rochelle rare-earths business; no deal has been confirmed.
Sources
- Company website — Solvay (2026-09)
How this page is sourced
Everything here comes from public sources — company filings, annual reports, exchange announcements, government releases and trade press. Every figure is linked to the document it came from and carries the date that document was published, because a capacity number without a date is not a fact, it is a rumor with a decimal point.
What is deliberately absent: material nonpublic information. I have spent more than two decades in this industry and a good deal of what I know about these companies I learned under NDA. Those obligations do not expire and they do not bend for a website. Nothing I have been told in confidence appears here in any form, and nothing on this page — or missing from it — should be read as a signal about what I know privately. I hold NDAs absolutely. It is the reason clients tell me things.
Judgment is the other thing left out on purpose. This page reports what has been published and who published it. Whether a target is credible, whether a ramp will hold, whether a capacity figure survives contact with the plant behind it — that is the work I do for clients, and it does not belong in a free reference page.
Where public sources disagree, I say so rather than picking a winner. Where a figure has not been published, the field says so rather than carrying an estimate. An empty field is information too.
Public filings tell you what a company has said. Whether it holds up is a different question, and the one I get hired to answer.
Get in touch← Back to Solvay — Special Chem (Rare Earths), La Rochelle in the atlas · the full supply chain atlas