Rare-Earth Sulfate Cracking Liquor Tank Selection
Rare-Earth Sulfate Cracking Liquor (Concentrated-Sulfuric-Acid Bake-Liquor at 200-220 C Monazite (Ce,La,Th)PO4 and Bastnaesite (Ce,La)CO3F Cracking with Subsequent 60-90 C Water-Leach Producing Mixed REE2(SO4)3 + Th(SO4)2 + UO2SO4 + H3PO4 Bulk Acidic Sulfate Solution at 200-500 g/L Total REE-Equivalent + 50-200 g/L Free H2SO4 at Energy Fuels White Mesa, Iluka Eneabba, IREL Manavalakurichi, Bayan Obo, MP Materials, Lynas Kalgoorlie, and Solvay La Rochelle Refinery Operations) — Process-Water and Adjacency Tank Selection at REE Cracking
Rare-earth sulfate cracking liquor (mixed REE2(SO4)3 + Th(SO4)2 + UO2SO4 + H3PO4 + free H2SO4 acidic-sulfate solution generated at concentrated-sulfuric-acid bake of monazite (Ce,La,Pr,Nd,Th)PO4 + bastnaesite (Ce,La,Pr,Nd)CO3F mineral concentrate at 200-220 C in stainless or rotary kiln; subsequent 60-90 C water-leach of bake cake produces mixed REE2(SO4)3 + Th(SO4)2 + UO2SO4 + free H2SO4 + H3PO4 cracking liquor at 200-500 g/L total REE-equivalent + 50-200 g/L free H2SO4 + 10-100 g/L Th + 1-20 g/L U + 50-300 g/L H3PO4 byproduct) is the dominant feed solution to subsequent Th-precipitation + U-recovery + REE-conversion-to-chloride step at U.S. + Australian + European + Indian + Chinese REE-refinery operations including Energy Fuels White Mesa Utah cracking-restart program + Iluka Resources Eneabba WA refinery-FID + IREL Manavalakurichi India + Iridium Bayan Obo Inner Mongolia + MP Materials Mountain Pass California + Lynas Rare Earths Kalgoorlie WA cracking-and-leaching + Solvay La Rochelle France separation. Operating temperature 60-90 C at water-leach + 200-220 C at acid-bake establish severe corrosion + radiation-control + thermal-cycling envelope; tank selection at primary cracking-liquor service requires Hastelloy C-276 + tantalum + zirconium-702 + glass-lined-steel + FRP vinyl-ester or PVDF or HDPE-lined-steel construction OUTSIDE HDPE rotomolded scope.
U.S. + Australian + European + Indian + Chinese REE cracking + acid-leach supply is concentrated at major operators with NORM-TENORM-licensed cracking facility (Energy Fuels Resources White Mesa Utah UMTRCA Title II licensed source-material disposal facility + monazite-cracking restart program + Iluka Resources Eneabba WA monazite refinery + IREL Manavalakurichi India monazite cracking + Iridium Bayan Obo Inner Mongolia integrated mine-and-cracking + MP Materials Mountain Pass California bastnaesite cracking + Lynas Rare Earths Kalgoorlie WA cracking + Lynas LAMP Kuantan Malaysia separation + Solvay La Rochelle France integrated cracking-and-separation). Bulk concentrated-sulfuric-acid supply at the cracking facility is conventional industrial-chemical procurement with rail-tank-car + ISO-tank delivery.
The eight sections below cite OSHA Hazard Communication 29 CFR 1910.1200 + 1910.1000 sulfuric-acid + radioactive-aerosol air-contaminant ceiling + MSHA 30 CFR 56/57 surface-and-underground-mine standard at REE-cracking + IAEA NORM-TENORM + 10 CFR 20 NRC source-material license + 40 CFR 192 EPA UMTRCA + ASTM D511 Cl + ASTM D1971 metals + EPA Method 6010 + 6020 + 9056 ICP-AES + ICP-MS REE + sulfate analytical + EPA NPDES + state-specific cracking-and-refining permit + EPA SPCC + state-specific NORM-TENORM tailings + radioactive-source-material code + EPA RCRA Subtitle C + Bevill exemption + DOE NDAA Sec 154 critical-mineral source + Defense Production Act Title III rare-earth + DOE Rare Earth Demonstration Plant + Defense Logistics Agency Strategic and Critical Stockpile + EXIM Bank financing framework at routine operating practice at North American + Australian + European + Indian + Chinese REE-cracking operations.
1. Material Compatibility Matrix
Rare-earth sulfate cracking liquor at typical 200-500 g/L REE2(SO4)3 + 50-200 g/L free H2SO4 + 60-90 C water-leach process temperature is a strongly corrosive concentrated-sulfuric-acid solution with severe thermal + chloride + sulfate + radiation-aerosol + scaling envelope against ordinary stainless and corrosion-resistant-alloy construction. Operating-discipline controls: temperature discipline (60-90 C operating range at water-leach + 200-220 C at acid-bake step accelerates sulfuric-acid attack on 304 + 316L stainless above 50 C and on FRP vinyl-ester above 80 C), free-acid-strength discipline (50-200 g/L free H2SO4 drives concentrated-sulfuric-acid aggression; HDPE acceptable only at less-than-50 C dilute service), NORM-TENORM radiation discipline (Th + U residual at 10-100 g/L drives 10 CFR 20 + state radiation-control-license + dose-rate survey + ALARA framework; tank surfaces accumulate Ra-226 + Pb-210 + Po-210 daughter activity heavily), and Th-phosphate + REE-phosphate scaling discipline (concurrent H3PO4 byproduct drives REE-phosphate + Th-phosphate scale + filter-blinding at thermal-cycling).
| Material | REE Sulfate Cracking Liquor @ 25C | REE Sulfate Cracking Liquor @ 80C | Notes |
|---|---|---|---|
| HDPE rotomolded | B | NR | NOT recommended at primary cracking liquor; acceptable at process-water + dilute reagent adjacency only |
| XLPE rotomolded | B | NR | Same as HDPE; adjacency only |
| FRP vinyl-ester resin | A | B | STANDARD at primary cracking-liquor leach + storage at 60-90 C; thermal-cycling-rated lay-up |
| FRP isophthalic polyester | C | NR | NOT recommended; vinyl-ester or premium-resin only |
| PVDF (Kynar) lined steel | A | A | Premium at concentrated + heated cracking-liquor service |
| Hastelloy C-276 | A | A | STANDARD at primary cracking-liquor reactor + transfer at 200-220 C bake step; specialty |
| Tantalum lining | A | A | Premium at boiling-acid bake-and-leach reactor; specialty |
| Zirconium 702 | A | A | Premium at concentrated-acid reaction-vessel; specialty |
| Glass-lined steel | A | A | STANDARD at acid-bake + water-leach reactor + storage at 200-220 C bake-cake water-leach |
| HDPE-lined carbon steel | B | NR | Acceptable only at ambient-temperature cracking-liquor pre-process |
| 304 stainless steel | NR | NR | NOT recommended; sulfuric-acid pitting + radiation-aerosol attack at any service |
| 316L stainless steel | C | NR | Acceptable only at very-dilute ambient pre-process; not at cracking liquor |
| EPDM | A | B | Standard gasket at sulfuric-acid service to 80 C |
| Viton (FKM) | A | A | Standard at higher-temperature pump + valve seat at sulfuric-acid service |
| PTFE | A | A | Premium gasket + diaphragm + valve seat at concentrated-acid service |
| PVC Sch 80 | B | NR | Acceptable only at ambient-temperature dilute service |
| CPVC Sch 80 | A | B | Preferred at 60-95 C reagent + transfer piping at adjacency |
The dominant industrial pattern at U.S. + Australian + European + Indian + Chinese REE-cracking operations is glass-lined-steel + Hastelloy C-276 + tantalum at primary acid-bake + water-leach reactor at 200-220 C bake + 60-90 C leach service, with FRP vinyl-ester or PVDF-lined-steel storage at 5,000-200,000-gallon scale for cracked-liquor circulating + storage tank, and HDPE rotomolded tanks at the process-water + caustic-makedown + lime-makedown + flocculant + reagent + analytical-lab + adjacency 1,500-10,000-gallon scale outside the primary cracking-liquor circuit. OneSource Plastics' 5-brand HDPE network (Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, Bushman) covers the process-water + caustic-makedown + lime-makedown + flocculant + reagent adjacency envelope at REE refinery operations; primary cracking-liquor service at 5,000-500,000-gallon scale requires glass-lined-steel + Hastelloy C-276 + tantalum + FRP vinyl-ester + PVDF-lined-steel construction OUTSIDE our HDPE 5-brand scope, and we refer those specifications to qualified premium-alloy + glass-lined + FRP vinyl-ester + PVDF-lining tank fabricators with NORM-TENORM-experience.
2. Real-World Industrial Use Cases
Cracked-Monazite Acid-Bake Refinery (Dominant Use). Monazite mineral concentrate ((Ce,La,Th)PO4 mixed-LREE-phosphate at 50-65 wt% REE2O3 + 4-10 wt% ThO2 + 0.1-1 wt% U3O8) is cracked at 96-98% concentrated-sulfuric-acid bake at 200-220 C in glass-lined or Hastelloy or specialty rotary-kiln reactor for 2-4 hour residence time. Bake cake is water-leached at 60-90 C in glass-lined or Hastelloy or FRP-vinyl-ester reactor to mixed REE sulfate + Th sulfate + U sulfate + H3PO4 byproduct + free H2SO4 cracking liquor at 200-500 g/L total REE-equivalent + 50-200 g/L free H2SO4 + 10-100 g/L Th + 1-20 g/L U + 50-300 g/L H3PO4 byproduct. Energy Fuels White Mesa Utah + Iluka Resources Eneabba WA + IREL Manavalakurichi India + Iridium Bayan Obo China are dominant operators. Storage envelope: 5,000-500,000-gallon FRP vinyl-ester or PVDF-lined-steel cracking-liquor circulating + storage tank.
Cracked-Bastnaesite Acid-Bake Refinery. Bastnaesite mineral concentrate ((Ce,La,Pr,Nd)CO3F LREE-fluoro-carbonate at 60-70 wt% REE2O3 + low-Th + low-U) is roasted at 600-700 C to oxidize Ce(III) to Ce(IV) + drive off CO2 + F, then cracked at concentrated-sulfuric-acid bake at 200-220 C, water-leached at 60-90 C with Ce(IV) precipitation as cerium-oxide-cake + remaining REE-sulfate cracking-liquor at 200-500 g/L total REE-equivalent + 50-200 g/L free H2SO4. MP Materials Mountain Pass California + Lynas Mt Weld WA + LAMP Kuantan Malaysia are dominant operators. Storage envelope: 5,000-500,000-gallon FRP vinyl-ester or PVDF-lined-steel cracking-liquor tank.
Th-Phosphate and U-Oxide Precipitation Step. Cracking liquor is processed through Th-phosphate precipitation at pH 1-2 with phosphoric acid + Th(NaPO3)2 precipitate + U-oxide precipitation at pH 4-5 + REE-conversion to chloride form at downstream HCl-conversion step. Storage envelope: 5,000-200,000-gallon FRP vinyl-ester or HDPE-lined-steel reaction tank.
Phosphoric-Acid Byproduct Recovery. H3PO4 byproduct at 50-300 g/L in cracking liquor is recovered as fertilizer-grade phosphoric-acid + sodium-phosphate + ammonium-phosphate at downstream separation step. Storage envelope: 5,000-500,000-gallon FRP vinyl-ester or HDPE-lined-steel byproduct tank.
Process Water and Reagent Adjacency. Process water + caustic-makedown + lime-makedown + soda-ash + flocculant adjacency at the cracking + leach + Th-precipitation + U-precipitation step uses HDPE rotomolded 1,500-10,000-gallon storage in the standard chemical-process 5-brand network.
3. Regulatory Framework
OSHA 29 CFR 1910.1200 + 1910.1000 + 1910.1450 Hazard Communication. Sulfuric-acid + thorium-bearing-monazite + uranium-bearing-tailings + radioactive-aerosol handling at REE cracking facility requires OSHA Hazard Communication SDS + container labeling + PPE specification (chemical splash goggles + face shield + chemical splash suit + chemical-resistant glove + steel-toe boots + supplied-air or air-purifying respirator with sulfuric-acid + NORM-aerosol P100 cartridge + eye-wash + emergency shower per 1910.151 within 10 seconds of work area + designated trained operator + radiation-area-worker dosimetry + bioassay framework at TENORM-impacted area).
MSHA 30 CFR 56/57 Surface-and-Underground Mine Standard. MSHA 30 CFR 56.5001 + 57.5001 air-contaminant ceiling-limit + radioactive-aerosol exposure limit + escape-respirator + emergency-evacuation + ventilation + dust-suppression + radon-monitoring per 30 CFR 57.5037 at REE-cracking + acid-leach operation. Annual MSHA Part 46 + Part 48 worker refresher training.
IAEA NORM-TENORM and 10 CFR 20 NRC Source Material License. Cracking liquor at 10-100 g/L Th + 1-20 g/L U is regulated as NORM + TENORM under 10 CFR 20 NRC source-material license framework + 40 CFR 192 UMTRCA + state-specific radiation-control-program (Texas DSHS Bureau of Radiation Control + Utah Division of Waste Management and Radiation Control + Western Australia DMIRS Radiation Safety + Malaysia AELB Atomic Energy Licensing Board + ASNO Australian Safeguards and Non-Proliferation Office). Operator dose-rate survey + ALARA program + bioassay + dosimetry + annual dose limit 50 mSv occupational + 1 mSv public + radwaste-handling-specific + final-status-survey at decommissioning is mandatory. Energy Fuels White Mesa Utah operates as licensed UMTRCA Title II source-material disposal facility.
EPA RCRA Subtitle C + Bevill Exemption. REE-cracking residue + Th-bearing tailings + U-bearing tailings classify as TENORM under state-specific radiation-control-program + 40 CFR 192. Bevill exemption applies to mining-extracted ore + tailings under 40 CFR 261.4(b)(7).
EPA Method 6010 + 6020 + 9056 ICP-AES + ICP-MS + IC Sulfate Analytical. EPA SW-846 Method 6010C ICP-AES + 6020B ICP-MS + 9056 ion chromatography for sulfate at every NPDES + RCRA + state radiation-control compliance sample for total-REE quantification + Th + U + Ra-226 + Pb-210 + Po-210 + radium-equivalent + sulfate. ASTM D1971 metals analytical framework.
EPA NPDES + State Cracking-and-Refining Discharge Permit. REE-cracking discharge to surface water requires state-specific cracking-and-refining permit + EPA NPDES outfall + tailings-impoundment + radiation-monitoring + reclamation-bond framework.
EPA SPCC + State NORM-TENORM Tailings Code. Acidic cracking-liquor storage requires double-liner + leak-detection + secondary-containment + radiation-shielded-containment per state-specific NORM-TENORM tailings + radioactive-source-material code + UMTRCA Title II framework.
DOE NDAA Sec 154 Critical-Mineral Source and Defense Production Act Title III. Rare earth elements are designated critical mineral under DOE NDAA Sec 154 + USGS critical-minerals list + Defense Production Act Title III; U.S. DOD Industrial Base + DLA Strategic and Critical Stockpile + EXIM Bank financing + DOE Rare Earth Demonstration Plant Wheat Ridge Colorado provides domestic-REE-cracking support framework.
4. Storage System Specification
Primary REE Sulfate Cracking-Liquor Reactor and Tank (OUTSIDE OneSource HDPE Scope). Primary cracking-liquor acid-bake reactor at 200-220 C uses glass-lined-steel + Hastelloy C-276 + tantalum-lining specialty construction; water-leach reactor at 60-90 C uses glass-lined-steel + Hastelloy C-276 + FRP vinyl-ester resin + PVDF-lined-steel construction with C-veil chemical-resistant interior corrosion-barrier + structural-laminate + UV-resistant exterior gel-coat per ASTM D3299 + D4097 specification at 5,000-500,000-gallon storage scale. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope; we refer those specifications to qualified premium-alloy + glass-lined + FRP vinyl-ester + PVDF-lining tank fabricators.
Process Water and Reagent-Makedown Tank (HDPE Scope). Process-water + caustic-makedown + lime-makedown + soda-ash-makedown + flocculant-makedown + reagent makedown at the cracking facility uses 1,500-10,000-gallon HDPE or XLPE rotomolded vertical flat-bottom or shallow-cone-bottom atmospheric tank, 1.85 specific-gravity rated, mounted on level reinforced-concrete pad with secondary containment via integral catch-basin or external concrete-bermed pad sized to 110% of largest-tank volume; 3-4 inch flanged top fill + atmospheric vent; 2-3 inch flanged bottom outlet with full-bore PVC ball valve; 18-24 inch top manway; ultrasonic level transmitter; sample valve; opaque-pigmented HDPE for UV protection at outdoor service; freeze-protection insulation + heat-trace at northern-state operation.
Th-Precipitation and U-Precipitation Reaction Tank (Outside HDPE Scope). Th-phosphate + U-oxide precipitation reactor at 50,000-500,000-gallon scale uses FRP vinyl-ester + HDPE-lined-steel + glass-lined-steel construction with radiation-shielded secondary-containment.
Radiation-Area Containment. All cracking-liquor + Th-precipitate + U-precipitate storage at TENORM-impacted area requires radiation-shielded secondary containment + leak-detection + double-liner + concrete-bermed-pad with epoxy or polyurea topcoat + dose-rate monitoring + final-status-survey at decommissioning per 10 CFR 20 + 40 CFR 192 + state-specific radiation-control-program + UMTRCA Title II framework.
Containment and Spill Pad. All cracking-liquor + radioactive-bearing storage requires secondary containment per EPA SPCC + state-specific NORM-TENORM tailings + chemical-storage code; concrete-bermed pad with HDPE primary + secondary liner + leak-detection sump + acid-resistant epoxy or polyurea topcoat + radiation-survey at access.
5. Field Handling Reality
Handler PPE. Cracking-liquor + radiation-area entry: full-face supplied-air or air-purifying respirator with sulfuric-acid + NORM-aerosol P100 cartridge for routine open-system handling, chemical splash suit + chemical-resistant apron at any open-system handling, double nitrile or neoprene chemical-resistant glove at any contact, chemical splash goggles + face shield, steel-toe boots with chemical-resistant overshoe, eye-wash + emergency shower per OSHA 29 CFR 1910.151 within 10 seconds of work area, dosimetry-badge + bioassay framework at TENORM-impacted-area worker, designated trained-operator + ALARA-program + radiation-safety-officer oversight at every TENORM-impacted task.
Radiation-Area Discipline. TENORM-impacted-area access requires dose-rate-survey-meter + alpha-beta-contamination-survey at exit + dose-rate-restricted access at greater-than-0.5 mSv/hour zone + ALARA-program + bioassay at quarterly frequency + dosimetry at every worker. Dose-rate measurement at tank surface + scale buildup + filter-cake at routine 30/60/90-day inspection cycle. Cracking-area particularly impacted by Ra-226 + Pb-210 + Po-210 daughter activity from Th-decay-chain.
Acid-Spill Response. Cracking-liquor spill response: small-volume spill is contained at secondary-containment + neutralized in place with soda-ash or lime + sampled to less-than-50 g/L free acid + transferred via vacuum-truck to event-pond or process recycle. Large-volume spill triggers state-agency notification + radiation-survey + downstream water-quality + dose-rate sampling.
Cargo-Tank Receipt and Concentrated-Sulfuric-Acid Off-Loading. Concentrated-sulfuric-acid at 96-98% bulk tanker delivery: tanker pre-transfer site-survey + chemical-suit + supplied-air-respirator + Buddy-system + transfer-rate-monitoring + leak-detection + emergency-deluge per OSHA 1910.120 HAZWOPER. Rail-tank-car ISO-tank delivery is dominant format.
Process-Water Impurity Management. Si + Al + Fe + Ba + Sr + Ca + Mg + Pb + Th + U cation impurity in cracking liquor drives downstream Th + U + REE recovery selectivity; raw-water + recycled-water analysis at quarterly frequency with ICP-MS metal-impurity budget management is routine.
QC Sampling and Verification. Each bake-cake + leach-feed + leach-discharge + Th-precipitate + U-precipitate + REE-product sample collection: total-REE per ICP-MS + ICP-AES; individual REE distribution per ICP-MS at every stage; free-H2SO4 per acid-base titration; Th + U + Ra-226 + Pb-210 per gamma-spec + alpha-spec; sulfate per IC + ICP-AES; phosphate per ICP-AES; pH continuous + grab confirmation; specific-gravity + temperature continuous.
Scale and Sludge Management. REE-phosphate + Th-phosphate + Ba-Sr-Ca-sulfate + Ra-bearing-scale accumulates at tank surface + filter cake + transfer pipeline; routine 30-90-day inspection + descaling + radiation-survey + scale-disposal as TENORM waste under state radiation-control-program + UMTRCA framework is required.
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