🧪⚡ IonicRE × Nth Cycle: The Western rare earth recycling flowsheet just got a significant upgrade — and the chemistry tells the whole story. 🧵
Ionic Technologies' MAIL (Multifunctional Amide Ionic Liquid) platform has been operating 24/7 in Belfast since January 2024, delivering >99.9% individually separated rare earth oxides from magnet scrap.
The flowsheet works. But every hydrometallurgical rare earth process in the world — including Belfast — has had one persistent dependency: oxalic acid for the final precipitation step that converts dissolved REE ions into solid form before calcination.
Oxalic acid is consumed in every cycle, must be continuously resupplied, generates CO₂ during calcination, and — critically — China dominates its global supply. That dependency ends here.
Under a Joint Development and Licensing Agreement, US-based Nth Cycle (MIT spinout) will integrate its proprietary electro-extraction technology to replace Precipitation Step 3 in the Ionic Technologies flowsheet — the single precipitation node immediately after MAIL solvent extraction.
Nth Cycle uses electricity to generate the precipitating agent in-situ from the process solution itself, producing rare earth hydroxides RE(OH)₃ directly without any external oxalic acid addition. The result is a closed-loop system where HCl is regenerated continuously for reuse upstream, eliminating both the oxalic acid procurement dependency and its associated carbon emissions entirely.
⚗️ The chemistry — why this matters precisely:
The Three Precipitation Points in the Flowsheet
Precipitation 1 — ROW 1, top right
After: Filters (post-Digestion)
Role: Early bulk impurity removal — removing gangue, silicates, iron hydroxides from the initial digest solution before the main circuit. This is a crude scavenging step — not a REE recovery step.
Precipitation 2 — ROW 2, middle
After: Filters (second set) ← after second Digestion loop
Role: Secondary impurity cleanup — further removal of base metals, phosphates, residual iron. Still upstream of MAIL solvent extraction. Again not a REE precipitation step.
PRECIPITATION STEP 3 — BEFORE vs NOW
❌ BEFORE
⚗️ Reagent: Oxalic acid (external, consumed)
🌡️ Calcination: 800–900°C
💨 Emission: CO₂ released
🔗 Dependency: China-sourced oxalic acid
♻️ Reagent recovery: None
✅ NOW — Nth Cycle ⚡
⚡ Reagent: Generated in-situ by electricity
🌡️ Calcination: 400–500°C
💧 Emission: H₂O only
🔗 Dependency: Zero external reagents
♻️ Reagent recovery: HCl regenerated continuously
Chemistry is in the graphic. Old route: oxalate calcination at 800–900°C, emits CO₂. New Nth Cycle route: hydroxide precipitation direct, calcines at 400–500°C, releases H₂O only. Same >99.9% REO output. Half the energy. Zero Chinese reagent dependency. ⚡🧪
🔬 What doesn't change — and why that matters:
Importantly, this is not a circuit redesign. The two upstream precipitation steps (Precipitations 1 and 2) handle base metal and impurity removal using pH adjustment chemistry — they are completely unchanged. MAIL solvent extraction upstream is unchanged. The calcination oven is unchanged hardware, simply running at lower temperature with shorter dwell time. The output specification — >99.9% individual rare earth oxides — is unchanged.
What changes: one unit operation, Precipitation Step 3, is replaced with an electrochemical cell. The existing Belfast flowsheet absorbs this as a drop-in process upgrade — same capital equipment, lower opex, lower carbon, zero Chinese reagent dependency.
🎯 Why the hydroxide route is actually superior to oxalate:
Beyond eliminating the oxalic acid dependency, Nth Cycle's electrochemical approach offers something the oxalate route fundamentally cannot: voltage-tunable selectivity.
Different rare earth ions precipitate as hydroxides at different electrochemical potentials — meaning the electro-extraction step adds an additional layer of purification on top of the MAIL separation already completed. This is an extra quality assurance mechanism embedded into the process itself.
The Belfast 400 tpa scale-up facility (£12M UK Government Offer in Principle) now have a cleaner, cheaper, more resilient production pathway than any other Western rare earth recycling operation.
🧲 Two schematics attached — original Ionic Technologies flowsheet vs the upgraded circuit with Nth Cycle Electro-Extraction integrated at Precipitation Step 3. Watch the Nth Cycle technology explainer video for the full engineering picture.
The most resilient and competitive Western REO production pathway just got more resilient and more competitive. 🇬🇧🇺🇸⚡
@IONIC_RE @IONICTECH_UK @NthCycle
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