Can Ionic Liquids Finally Crack Rare Earth Separation? A New Study Says "Perhaps"-But Investors Should Read the Fine Print

Highlights

• Idaho National Laboratory and Wyonics conducted a techno-economic analysis of ionic-liquid-based rare earth extraction from monazite ore, finding potential cost competitiveness under optimized conditions.
• No commercial-scale ionic liquid rare earth separation facility exists anywhere in the world; the study extrapolates from laboratory data, placing the technology at a low technology readiness level.
• Key authors hold ownership interests and licensed patents in Wyonics, whose proprietary technology underpins the analysis—a material conflict of interest investors must weigh.
• A 10% improvement in ionic-liquid reuse or leaching efficiency could push production costs toward current market prices, but that threshold has not yet been demonstrated at scale.
• Major rare earth producers including Lynas, MP Materials, and Energy Fuels continue scaling proven solvent extraction, not ionic liquids, for near-term commercial separation.

Separating rare earth elements remains one of the most difficult—and expensive—steps in the entire mine-to-magnet supply chain. A new study led by Idaho National Laboratory chemical engineer Tien Le, PhD (opens in a new tab), and colleagues, published in Separation and Purification Technology, evaluates whether ionic liquids (ILs) could make that process faster, cheaper, and more selective than conventional solvent extraction. Idaho National Laboratory (INL) team members collaborated with Wyoming-based Wyonics (opens in a new tab) and the University of Wyoming; the team developed a techno-economic analysis (TEA) of a conceptual commercial-scale process using proprietary ionic-liquid chemistry to both leach and separate rare earth elements from monazite ore. Their conclusion is cautiously encouraging: the process could become economically competitive if ionic-liquid reuse and leaching efficiency improve. Investors, however, should recognize that this remains a modeling study based on laboratory-scale data, not evidence that ionic liquids are ready to replace today's commercial separation technologies.

From Laboratory to Balance Sheet

Rather than constructing a pilot or commercial plant, the researchers built an integrated economic model combining Wyonics' patented ionic-liquid technology with upstream and downstream process units developed by Idaho National Laboratory. The model estimated capital expenditures, operating costs, energy consumption, production economics, and process sensitivity for a conceptual facility processing monazite ore. The objective was not to prove commercial performance, but to determine whether scaling the technology might eventually make economic sense.

What the Study Found

The analysis suggests ionic liquids could reduce one of rare earth processing's largest capital costs: the long series of solvent-extraction stages normally required to separate individual rare earth oxides. Because ionic liquids can be engineered to exhibit higher selectivity for specific rare earth elements, fewer separation stages may be required. Sensitivity analysis further showed that a 10% improvement in ionic-liquid reuse or leaching efficiency could reduce production costs toward current market prices.

Tien Le, PhD, Idaho National Laboratory

Reality Check

The authors appropriately acknowledge that no industrial-scale ionic-liquid rare earth extraction and separation facility currently operates anywhere in the world. Their economic analysis extrapolates laboratory-scale performance to a conceptual commercial facility, introducing uncertainty typical of technologies at a low technology readiness level (TRL). The paper also discloses that several authors hold ownership interests and licensed patents in Wyonics, whose technology underpins the analysis—an important disclosure investors should consider when interpreting the conclusions.

Why This Matters

Rare Earth Exchanges® views this study as an important contribution to next-generation separation science—but not evidence that the industry's commercial direction is changing today. Nearly every major ex-China separation project now advancing—including Lynas Rare Earths, MP Materials, Energy Fuels, Carester, Solvay, Neo Performance Materials, Saskatchewan Research Council, Iluka Resources, and others—continues to scale proven hydrometallurgical solvent extraction. Other approaches include ReElement Technologies (advanced chromatographic separation and purification process). Ionic liquids may eventually improve or complement those flowsheets, but they must first cross the industry's most difficult threshold: demonstrating reliable, continuous, and economically competitive operation at commercial scale.

Study Authors

Profile

Founded in 2017 and headquartered in Laramie, Wyoming, Wyonics LLC is a research and development company focused on advancing sustainable chemical technologies for critical materials, advanced manufacturing, and environmental applications. The company specializes in ionic liquid chemistry, developing proprietary processes for extracting and separating rare earth elements and other critical minerals from conventional and unconventional feedstocks, including coal fly ash and geothermal brines. Beyond critical minerals, Wyonics is developing biodegradable filtration materials derived from natural biopolymers and precision micro- and nano-manipulation technologies for semiconductor manufacturing, nuclear forensics, and nanomedicine. The company was co-founded by Kristin R. Di Bona, Ph.D. (CEO), Gabriela Gurau, Ph.D. (COO), Caleb M. Hill, Ph.D. (CTO), and internationally recognized ionic liquids pioneer Robin D. Rogers, Ph.D. (CSO). Wyonics' mission is to commercialize innovative technologies that address strategic economic, environmental, and national security challenges through advanced materials science and sustainable process engineering.

Citation: Le, T., Gilfillan, J., Srinivas, S., et al. Scaling up rare earth element extraction and separations by ionic liquids: a techno-economic analysis. Separation and Purification Technology (2026), Journal Pre-proof. DOI: 10.1016/j.seppur.2026.139524.