Rare-Earth Mixed Chloride Leach Solution Tank Selection
Rare-Earth Mixed Chloride Leach Solution (REECl3 Mixed Light-REE and Heavy-REE Chloride at 0.5-2.0 M Total Rare-Earth Concentration in 1-3 N Hydrochloric Acid HCl Recirculated Through Ion-Adsorption Clay Heap-Leach, Cracked-Monazite, and Cracked-Bastnaesite Acid-Leach Circuit at MP Materials Mountain Pass, Lynas Kalgoorlie and Kuantan, Energy Fuels White Mesa, Iluka Eneabba, Solvay La Rochelle, Shenghe Jiangxi, and Iridium Bayan Obo Rare-Earth Refinery Operations) — Process-Water and Adjacency Tank Selection at Rare-Earth Element Hydrometallurgy
Rare-earth mixed chloride leach solution (REECl3 mixed-rare-earth chloride; light rare-earth elements LREE La + Ce + Pr + Nd + Sm + Eu + Gd plus heavy rare-earth elements HREE Tb + Dy + Ho + Er + Tm + Yb + Lu plus yttrium Y + scandium Sc dissolved at 0.5-2.0 M total REE concentration as REECl3 trichloride in 1-3 N hydrochloric acid HCl process water; recirculated through ion-adsorption clay heap-leach circuit at South China + Myanmar + Madagascar + Brazil weathered-laterite REE deposit, through cracked-monazite acid-leach circuit at Energy Fuels White Mesa Utah + Iluka Eneabba Western Australia + IREL Manavalakurichi India + Bayan Obo Inner Mongolia operation, through cracked-bastnaesite acid-leach circuit at MP Materials Mountain Pass California + Mountain Pass-Stage-1-restart + Lynas Mt Weld + Mt Weld concentrator-LAMP Kuantan-Malaysia split + Iridium Bayan Obo + Shenghe Jiangxi-Iridium-JV operation; mixed REE chloride feed solution at 0.5-2.0 M REE + 1-3 N free HCl + Th less-than-50 ppm post-cracking + U less-than-20 ppm post-cracking + Ba + Sr + Ca + Mg less-than-5000 ppm process-water-dependent + Fe less-than-100 ppm + Al less-than-500 ppm) is the primary feed solution to subsequent REE-separation step (multi-stage countercurrent solvent-extraction with PC-88A + P507 + Cyanex 272 + Cyanex 923 + DEHPA + LIX + tributyl-phosphate TBP organic-extractant in kerosene-or-aliphatic-diluent at 30+ extraction-scrub-strip stage train, or ion-exchange chromatographic-separation with displacement-development chromatography on cation-exchange-resin Amberlite-IR-120 + Dowex-50W + Lewatit-S100 column train) at REE separation refinery worldwide.
U.S. + Australian + European + Chinese rare-earth-element hydrometallurgy supply is concentrated at major operators (MP Materials Mountain Pass California Stage-1-LREE-and-Stage-2-NdPr-restart + Lynas Rare Earths Kalgoorlie WA cracking-and-leaching + LAMP Kuantan Malaysia separation + Energy Fuels White Mesa Utah monazite-cracking + Iluka Resources Eneabba WA monazite refinery-FID + Vital Metals Saskatoon Canada monazite-feed + Ucore Rare Metals Louisiana RapidSX + Solvay La Rochelle France separation-and-oxide + Shenghe Resources Jiangxi China + Northern Minerals Browns Range WA HREE + Hastings Yangibana WA NdPr + Pensana Saltend UK NdPr-from-Longonjo-Angola). Bulk hydrochloric acid + caustic soda + soda ash + oxalic acid + sodium hydroxide + sodium carbonate + ammonium bicarbonate + lime + flocculant adjacency reagent supply at the REE refinery is conventional industrial-chemical procurement.
The eight sections below cite OSHA Hazard Communication 29 CFR 1910.1200 + 1910.1000 hydrochloric-acid + caustic + radioactive-material air-contaminant ceiling + MSHA 30 CFR 56/57 surface-and-underground-mine standard at REE-mining-and-cracking + IAEA Naturally Occurring Radioactive Material NORM + Technologically-Enhanced Naturally-Occurring Radioactive Material TENORM framework + 10 CFR 20 NRC source-material license + 40 CFR 192 EPA Uranium Mill Tailings Radiation Control Act UMTRCA + ASTM D511 Cl + ASTM D1971 metals + EPA Method 6010 + 6020 ICP-AES + ICP-MS REE analytical + EPA NPDES + state-specific mining-and-refining permit + EPA SPCC + state-specific NORM-TENORM tailings + radioactive-source-material code + EPA RCRA Subtitle C TCLP + Bevill exemption + Department of Energy 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 + Chinese REE-refinery operations.
1. Material Compatibility Matrix
Rare-earth mixed chloride leach solution at typical 0.5-2.0 M REECl3 + 1-3 N HCl + 60-80 C process temperature is a moderately corrosive acidic chloride solution with chloride-induced pitting + crevice corrosion risk against austenitic stainless and corrosion-resistant-alloy construction. Note the operating-discipline controls: temperature discipline (40-80 C operating range at acid-leach circuit accelerates chloride-induced pitting + stress-corrosion-cracking on 304 + 316L stainless above 60 C; FRP vinyl-ester + PVDF + HDPE-lined steel + tantalum + zirconium-702 + Hastelloy C-276 are preferred at higher-temperature service), free-acid-strength discipline (1-3 N HCl free acid drives chloride aggression; HDPE acceptable at less-than-2 N at ambient; FRP vinyl-ester acceptable to 36% HCl at 40 C), NORM-TENORM radiation discipline (Th + U residual at greater-than-10 ppm in solution drives 10 CFR 20 + state radiation-control-license + dose-rate survey + ALARA framework; tank surfaces + scale accumulate Ra-226 + Pb-210 + Po-210 daughter activity over service life), and silica-fluoride scaling discipline (Si + F + Al + REE-fluoride coprecipitation at thermal-cycling drives scale + filter-blinding; ion-adsorption-clay LREE feed often elevated-Si + elevated-Al + low-Th + low-U; cracked-monazite + cracked-bastnaesite feed elevated-Th + elevated-U).
| Material | REE Mixed Chloride @ 25C | REE Mixed Chloride @ 60C | Notes |
|---|---|---|---|
| HDPE rotomolded | A | B | Standard at process-water + dilute-acid + reagent + adjacency 1500-10000-gal service; not at primary high-strength chloride circuit |
| XLPE rotomolded | A | B | Standard at process-water + adjacency reagent service |
| Polypropylene (PP) | A | B | Standard at smaller process-water + reagent service |
| FRP vinyl-ester resin | A | A | STANDARD at primary REE chloride leach + storage + transfer at 0.5-2.0 M REE + 1-3 N HCl service across 5,000-200,000-gallon scale |
| FRP isophthalic polyester | B | C | Acceptable at dilute service only; vinyl-ester is preferred specification |
| PVDF (Kynar) lined steel | A | A | Premium at higher-temperature concentrated-chloride service + radiation-resistant containment |
| HDPE-lined carbon steel | A | A | Standard at primary REE chloride storage + radiation-shielded containment at 50,000-500,000-gallon scale |
| 304 stainless steel | C | NR | NOT recommended; chloride-induced pitting + crevice corrosion at any service |
| 316L stainless steel | B | C | Acceptable at very-dilute ambient service; chloride pitting at concentrated + heated service |
| Hastelloy C-276 | A | A | Premium at high-temperature concentrated-chloride pipe + valve trim + electrowinning-cell |
| Tantalum lining | A | A | Premium at boiling-HCl reaction-vessel service; specialty |
| Zirconium 702 | A | A | Premium at concentrated-HCl reaction-vessel service |
| Glass-lined steel | A | A | Standard at boiling-HCl pickle + leach reactor service |
| EPDM | A | A | Standard gasket + lining material at chloride service |
| Viton (FKM) | A | A | Standard at higher-temperature pump + valve seat |
| PTFE | A | A | Premium gasket + diaphragm + valve seat at concentrated-chloride service |
| PVC Sch 80 | A | B | Standard at ambient-temperature dilute-chloride piping; not above 60 C |
| CPVC Sch 80 | A | A | Preferred at 60-95 C reagent + transfer piping |
The dominant industrial pattern at U.S. + Australian + European + Chinese REE-refinery operations is FRP vinyl-ester resin storage at 5,000-200,000-gallon scale for primary REE chloride leach + circulating + storage tank, HDPE-lined carbon-steel or PVDF-lined steel at 50,000-500,000-gallon scale for radiation-shielded primary REE chloride containment, and HDPE rotomolded tanks at the process-water + acid-makedown + caustic-makedown + flocculant + reagent + analytical-lab + adjacency 1,500-10,000-gallon scale outside the primary REE chloride circuit. OneSource Plastics' 5-brand HDPE network (Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, Bushman) covers the process-water + acid-makedown + caustic-makedown + flocculant + reagent adjacency envelope at REE refinery operations; primary REE chloride storage at 5,000-500,000-gallon scale requires FRP vinyl-ester or PVDF-lined steel or HDPE-lined steel construction OUTSIDE our HDPE 5-brand scope, and we refer those specifications to qualified FRP vinyl-ester + PVDF + HDPE-lining tank fabricators with NORM-TENORM-experience.
2. Real-World Industrial Use Cases
Ion-Adsorption Clay Heap-Leach REE Production (Dominant Asia-Pacific Use). Weathered-laterite ion-adsorption-clay deposit at South China Jiangxi + Guangdong + Fujian + Myanmar Kachin + Madagascar Tantalus + Brazil Serra Verde is leached in-situ or on-pad with ammonium-sulfate or sodium-chloride or magnesium-sulfate solution at 1-3 wt% concentration + ambient temperature; LREE preferentially desorbs from clay surface as ion-exchange equivalent at pregnant solution at 0.05-0.3 M total REE chloride or sulfate; mixed REE chloride feed solution at 1-2 M REE + 1-3 N HCl is generated at downstream concentration + acid-conversion step. Storage envelope: 5,000-200,000-gallon FRP vinyl-ester REE chloride feed tank.
Cracked-Monazite Acid-Leach Refinery. 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 concentrated-sulfuric-acid bake at 200-220 C, water-leached at 60-90 C to mixed REE sulfate + Th sulfate + U sulfate solution, Th + U precipitated as phosphate or oxide, and remaining REE solution is converted to chloride form at 1-3 N HCl + 0.5-2.0 M REE feed for downstream solvent-extraction. Energy Fuels White Mesa Utah + Iluka Resources Eneabba WA + IREL Manavalakurichi India + Bayan Obo China are dominant operators. Storage envelope: 5,000-500,000-gallon FRP vinyl-ester or HDPE-lined steel REE chloride feed tank.
Cracked-Bastnaesite Acid-Leach 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 leached at HCl at 60-90 C with Ce(IV) precipitation as cerium-oxide-cake + remaining REE solution converted to mixed-chloride feed. 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 REE chloride feed tank.
Solvent-Extraction REE Separation Train. Multi-stage countercurrent solvent-extraction with PC-88A or P507 (2-ethylhexyl-2-ethylhexyl-phosphonate) + Cyanex 272 (di-2,4,4-trimethylpentyl-phosphinic-acid) + DEHPA (di-2-ethylhexyl-phosphoric-acid) + Cyanex 923 (trialkyl-phosphine-oxide) + tributyl-phosphate TBP organic-extractant in kerosene-or-aliphatic-diluent at 30-100+ extraction-scrub-strip stage trains separates Ce + La + Pr + Nd + Sm + Eu + Gd + Tb + Dy + Ho + Er + Tm + Yb + Lu + Y into individual REE chloride solution at greater-than-99.99% purity. Mixer-settler + pulsed-column + centrifugal-contactor stage geometry. Storage envelope: 5,000-50,000-gallon FRP vinyl-ester or HDPE-lined steel feed + raffinate + scrub + strip tank.
Process Water and Reagent Adjacency. Process water + hydrochloric acid makedown + sodium hydroxide makedown + soda ash + oxalic acid + sodium carbonate + ammonium bicarbonate + lime + flocculant adjacency at the REE refinery 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. Hydrochloric-acid + caustic-soda + sodium-carbonate + oxalic-acid + thorium-bearing-monazite + uranium-bearing-tailings handling at REE refinery requires OSHA Hazard Communication SDS + container labeling + PPE specification (chemical splash goggles + face shield + chemical splash suit + double nitrile or neoprene chemical-resistant glove + steel-toe boots with chemical-resistant overshoe + supplied-air or air-purifying respirator with HCl + NORM-aerosol 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-mining + cracking + leaching operation. Annual MSHA Part 46 + Part 48 worker refresher training.
IAEA NORM-TENORM and 10 CFR 20 NRC Source Material License. Monazite + bastnaesite + xenotime + mineral concentrate + cracking liquor + REE chloride leach feed at greater-than-0.05 wt% Th + greater-than-0.05 wt% U is regulated as Naturally-Occurring Radioactive Material NORM + Technologically-Enhanced Naturally-Occurring Radioactive Material TENORM under 10 CFR 20 NRC source-material license framework + 40 CFR 192 EPA Uranium Mill Tailings Radiation Control Act UMTRCA + state-specific radiation-control-program (Texas Department of State Health Services Bureau of Radiation Control + Utah Division of Waste Management and Radiation Control + Australian ARPANSA + Malaysia AELB Atomic Energy Licensing Board + Western Australia DMIRS Radiation Safety + 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.
EPA RCRA Subtitle C + Bevill Exemption. REE-cracking residue + Th-bearing tailings + U-bearing tailings discharge classification: mining-extracted ore + tailings benefit from Bevill exemption to RCRA Subtitle C at most REE-cracking + leaching operations under 40 CFR 261.4(b)(7); but post-cracking tailings classify as TENORM under state-specific radiation-control-program + 40 CFR 192. Energy Fuels White Mesa Utah operates as licensed UMTRCA Title II source-material disposal facility.
EPA Method 6010 + 6020 ICP-AES and ICP-MS REE Analytical. EPA SW-846 Method 6010C ICP-AES + 6020B ICP-MS at every NPDES + RCRA + state radiation-control compliance sample for total-REE quantification + Th + U + Ra-226 + Pb-210 + Po-210 + radium-equivalent activity-concentration + Ge gamma-spec activity. ASTM D1971 metals + ASTM D511 Cl analytical framework.
EPA NPDES + State Mining-and-Refining Discharge Permit. REE-refinery discharge to surface water requires state-specific mining-discharge permit + EPA NPDES outfall + tailings-impoundment + radiation-monitoring + reclamation-bond framework at every operating REE refinery.
EPA SPCC + State NORM-TENORM Tailings Code. Acidic REE chloride leach solution storage requires double-liner + leak-detection + secondary-containment + radiation-shielded-containment per state-specific NORM-TENORM tailings + radioactive-source-material code (Utah Division of Waste Management and Radiation Control + Texas DSHS Bureau of Radiation Control + Western Australia DMIRS Radiation Safety + Malaysia AELB).
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. Department of Defense Industrial Base Analysis and Sustainment + Defense Logistics Agency Strategic and Critical Stockpile + EXIM Bank financing + DOE Rare Earth Demonstration Plant Wheat Ridge Colorado provides domestic-REE-refinery support framework.
4. Storage System Specification
Primary REE Chloride Leach and Storage Tank (OUTSIDE OneSource HDPE Scope). Primary REE mixed-chloride leach feed + circulating + storage tank at 5,000-500,000-gallon scale uses FRP vinyl-ester resin construction with C-veil chemical-resistant interior corrosion-barrier + structural-laminate + UV-resistant exterior gel-coat per ASTM D3299 + D4097 specification, or HDPE-lined carbon-steel construction with 250-mil rotational-molded HDPE liner + radiation-shielded secondary-containment + leak-detection per state-specific NORM-TENORM code, or PVDF-lined carbon-steel construction at higher-temperature service. Construction at qualified FRP fabricator (Belding Tank Technologies, Justin Tanks, ZCL Composites, Belco Manufacturing) or HDPE-lining + PVDF-lining specialist with NORM-TENORM-experience. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope; we refer those specifications to qualified FRP vinyl-ester + HDPE-lining + PVDF-lining tank fabricators.
Process Water and Acid-Makedown Tank (HDPE Scope). Process-water + hydrochloric-acid-makedown + caustic-makedown + sodium-carbonate-makedown + oxalic-acid-makedown + flocculant-makedown + reagent makedown at the REE refinery 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.
Solvent-Extraction Mixer-Settler Train (Mixed Scope). SX mixer-settler train at 1,000-50,000-gallon stage volume uses FRP vinyl-ester or HDPE-lined steel construction at primary aqueous + organic phase contact, with HDPE 5-brand scope at adjacent reagent-makedown + scrubber-makedown + strip-acid-makedown 1,500-10,000-gallon service.
Radiation-Area Containment. All cracking-liquor + REE chloride leach solution 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.
Containment and Spill Pad. All REE chloride leach 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. REE-refinery + cracking-area entry: full-face supplied-air or air-purifying respirator with HCl + 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.
Acid-Spill Response. Acidic REE chloride leach spill response: small-volume spill is contained at secondary-containment + neutralized in place with soda-ash or lime + sampled to less-than-2 N 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 Reagent Off-Loading. Hydrochloric-acid + caustic-soda + soda-ash + oxalic-acid 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. ICMI is NOT applicable; standard chemical-handling framework.
Process-Water Impurity Management. Si + Al + Fe + Ba + Sr + Ca + Mg + Pb + Th + U cation impurity in REE chloride solution drives downstream solvent-extraction + ion-exchange selectivity + impurity-budget management; raw-water + recycled-water analysis at quarterly frequency with ICP-MS metal-impurity budget management is routine. Th + U is removed at upstream cracking + Th-phosphate + U-oxide precipitation step.
QC Sampling and Verification. Each cracked-liquor + leach-feed + solvent-extraction-stage + product-strip-solution sample collection: total-REE per ICP-MS + ICP-AES at quarterly + by-stage; individual REE distribution per ICP-MS at every stage; free-HCl per acid-base titration; Th + U + Ra-226 + Pb-210 per gamma-spec + alpha-spec at TENORM-impacted-stream; pH continuous + grab confirmation; Cl per ASTM D511; specific-gravity + temperature continuous.
Scale and Sludge Management. REE-fluoride + REE-phosphate + Ba-Sr-Ca-sulfate + Ra-bearing-scale accumulates at tank surface + filter cake + transfer pipeline; routine 90-180-day inspection + descaling + radiation-survey + scale-disposal as TENORM waste under state radiation-control-program is required.
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