Separation (Membrane)
Next-generation enclosed-system separation using hydrophobic membrane contactors (e.g. Carester MSX) or ion-exchange chromatography (e.g. Energy Fuels). Organic solvent is confined within the membrane pore structure with near-zero open-tank exposure, eliminating raffinate discharge ponds and cutting solvent inventory to ~10 t per 100 t feed. Best-in-class ESG profile among all separation routes.
Where does the mass go?
Material flow balance — per 100 t mixed REE chloride feed — Membrane SX (MSX)
Critical Ratio
Membrane SX keeps extractant locked inside hydrophobic membrane pores — eliminating open-tank solvent exposure and cutting raffinate to ~13% of the conventional volume
Ratings
Material Flow
Key Reagents / Inputs
- Selective membrane extractants
- Hydrochloric acid (strip)
- Ion-exchange resin (IEX route)
Waste Outputs
- Minimal treated raffinate
- Spent IEX resin (IEX route)
- Membrane cleaning effluent
Technical Moat
Very HighThe moat is Membrane Materials Science and System Integration. Fabricating membranes that maintain selectivity and flux under continuous industrial REE chemistry without fouling or degradation is a deep materials engineering challenge. European IP (Carester) and US DoE-funded IEX programmes hold the leading positions outside China.
