Lime Neutralization Slurry Tank Selection Mining
Lime Neutralization Slurry (Hydrated Lime Ca(OH)2 Slurry at 5-30% Solids in Water; High-Density-Sludge HDS Makedown for AMD, Tailings, Acid-Neutralization, and Hydrometallurgy at Copper, Zinc, Nickel, Coal, Uranium, Iron-Ore, and Tailings-Treatment Mining Operations from ASTM C977 Quicklime CaO and ASTM C25 Hydrated Lime Ca(OH)2 + ASTM C5 Limestone CaCO3 Pebble-Lime + Pulverized-Lime Feedstock at Lime-Plant Bulk Truck or Rail-Car Delivery) — Tank Selection at Mine-Site Lime-Makedown, HDS Reactor Recycle, AMD-Treatment, and Tailings-Neutralization Service
Lime neutralization slurry (hydrated lime Ca(OH)2; CAS 1305-62-0 hydrated lime + 1305-78-8 quicklime CaO + 1317-65-3 limestone CaCO3 + 471-34-1 calcium-carbonate; supplied at quicklime CaO pebble + pulverized + screened, hydrated-lime Ca(OH)2 dry powder + slurry, slaked-lime hot slurry from on-site quicklime hydrator, and limestone CaCO3 pebble + pulverized; slurry made at on-site lime-makedown station at 5-30% solids by mixing dry hydrated lime or quicklime with water at vortex slurry-tank or paste-makedown system; specific gravity 1.05-1.25 at typical 10-20% solids; pH 12.0-12.5 saturated lime; particle size D50 5-50 micron at hydrated-lime grade and 50-300 micron at pebble-lime grade; supplied as bulk truck pneumatic-discharge dry hydrated-lime + quicklime delivery at 25-30 ton dry-bulk pneumatic trailer + rail-car at 90-100 ton dry-bulk hopper-car + lime-slurry tanker at 10-15% solids 5000-6500 gallon DOT 412 cargo tank; ASTM C977 quicklime + C25 hydrated lime + C5 limestone + C593 lime-fly-ash specifications + AWWA B202 quicklime-and-hydrated-lime + AWWA B600 powdered-activated-carbon-and-coagulant grade) is the dominant alkaline-neutralization reagent at modern AMD-treatment + copper + zinc + nickel + coal + uranium + iron-ore mining + tailings-neutralization + tankhouse-effluent-neutralization + cement-stabilization + biosolids-stabilization + wastewater-treatment-coagulation + flue-gas-desulfurization operations across the global mining + utility + municipal + industrial market.
U.S. and Canadian lime-slurry consumption is concentrated at major mining + AMD-treatment + power + cement + paper + water-treatment + food-processing + steel + chemical operations with primary lime producers (Carmeuse Lime + Graymont + Lhoist North America + Mississippi Lime + Eastern Industries + Specialty Minerals + LafargeHolcim Lime + Pete Lien & Sons + Western Lime + United States Lime & Minerals + Coldspring Lime). Bulk lime is delivered as 25-30 ton dry-bulk pneumatic trailer + 90-100 ton dry-bulk rail-car + 5000-6500 gallon lime-slurry DOT 412 cargo tank.
The eight sections below cite OSHA Hazard Communication 29 CFR 1910.1200 + 1910.1000 calcium-hydroxide PEL + 29 CFR 1910.1450 caustic exposure + MSHA 30 CFR 56/57 surface-and-underground-mine + EPA Method 6010 + 6020 metal analytical + EPA Method 9040 pH + AWWA B202 + B600 + ASTM C25 + C977 + C5 + C593 + ANSI/AWWA B202 + B600 + Canadian CSA B65 + state-specific lime-bulk-storage code + state-specific mining permit + EPA NPDES outfall + EPA SPCC + Title V Clean Air Act fugitive-dust + 40 CFR 50 NAAQS PM10 + PM2.5 + 40 CFR 60 NSPS + state-specific lime-bulk-storage permit + DOT 49 CFR 173 (lime-slurry typically not regulated as hazardous; freezing-temperature precaution) framework at routine operating practice at North American + global mining + AMD-treatment + utility + municipal + industrial lime-slurry receipt + makedown + dosing operations.
1. Material Compatibility Matrix
Lime neutralization slurry at typical 5-30% solids hydrated-lime Ca(OH)2 + pH 12.0-12.5 saturated-lime + 5-50 micron particle is a moderately abrasive caustic-alkaline aqueous slurry with low chemical-corrosion risk against most polymeric construction but with pronounced operating-discipline issues. Note operating-discipline considerations: scaling discipline (calcium-carbonate scale CaCO3 from CO2 absorption + calcium-sulfate gypsum CaSO4-2H2O at acid-neutralization product drives buildup at lime-slurry transfer-pipe interior + dosing-pump impeller + flow-control valve; routine acid-cleaning at 1-3 month frequency with HCl or weak-acid soak is mandatory to maintain throughput), abrasion-wear discipline (hydrated-lime particle Mohs hardness 2-3 + pebble-lime to 4 drives accelerated abrasion-wear at pump impeller + pipe elbow + valve seat at high-velocity transfer; abrasion-resistant elastomer-lined progressive-cavity + peristaltic + rotary-lobe pump + UHMW-PE or rubber-lined pipe-liner is RECOMMENDED at long-service equipment), settling discipline (hydrated-lime slurry at 10-20% solids settles rapidly at static hold; continuous mechanical agitation at 50-150 rpm vertical impeller + bottom-recirculating-pump loop is mandatory at any storage longer than 1-4 hours), CO2-absorption discipline (open-system lime-slurry tank absorbs atmospheric CO2 + forms CaCO3 scale + reduces alkalinity reagent-strength; sealed-tank specification with vent-filter or CO2-scrubber + nitrogen-blanket is preferred at high-purity application; agitation-driven slurry refresh at 24-72 hour frequency is standard at open-tank installation), and quicklime-hydration discipline (quicklime CaO at on-site hydrator generates exothermic heat at 1200-1400 BTU/lb CaO + temperature spike to 80-95C + hydrogen-gas potential at trace + dust + caustic-mist; vented-enclosure hydrator + hot-water-jacket + insulation + supplied-air-respirator at adjacent worker is mandatory).
| Material | Lime Slurry @ 25C | Lime Slurry @ 60C | Notes |
|---|---|---|---|
| HDPE rotomolded | A | A | Standard at lime-slurry storage + makedown + day-tank service across the 1,500-10,000-gallon range; opaque-pigmented for UV protection + abrasion-resistant grade preferred |
| XLPE rotomolded | A | A | Standard at higher-temperature slaked-lime hot-slurry service to 60C |
| Polypropylene (PP) | A | A | Standard at smaller specialty + dosing service |
| FRP vinyl-ester resin | A | A | Standard at larger lime-slurry bulk + recirculation + reaction-tank service across the 50,000-2,000,000-gallon scale |
| FRP polyester resin | A | B | Standard at lower-temperature lime-slurry; not preferred at hot slaked-lime service |
| 304 stainless steel | A | A | Standard at lime-slurry pump + valve + transfer-pipe + analytical-lab service |
| 316L stainless steel | A | A | Premium at chloride-bearing application + analytical service |
| Carbon steel uncoated | A | A | Standard at primary lime-slurry storage + reaction tank at AMD treatment + tailings-neutralization 50,000-2,000,000-gallon scale; mild-steel construction is acceptable at alkaline lime service with periodic abrasion-wear inspection |
| Carbon steel rubber-lined | A | A | Premium at high-velocity transfer-pipe + reaction-tank service; natural-rubber or chlorobutyl-rubber liner |
| Aluminum 5083 / 6061 | NR | NR | NOT recommended; aluminum is rapidly attacked by alkaline lime + dissolves as aluminate |
| EPDM | A | A | Standard gasket + lining at lime-slurry service |
| Viton (FKM) | A | A | Standard at higher-temperature pump + valve seat |
| Nitrile (Buna-N) | B | B | Acceptable at brief contact only; not preferred at long-hold |
| PVC Sch 80 | A | B | Standard at piping at lime-slurry service to 50C; temperature-derated above 50C; abrasion-wear at high-velocity |
| CPVC Sch 80 | A | A | Preferred at higher-temperature lime-slurry piping |
| UHMW-PE pipe lining | A | A | Premium abrasion-resistant pipe interior at high-velocity slurry transfer |
| Rubber-lined pipe | A | A | Premium abrasion-resistant pipe at long-service high-velocity transfer |
The dominant industrial pattern at North American + global mining + AMD-treatment + utility + municipal lime-slurry handling is HDPE or XLPE rotomolded vertical bulk + makedown + day-tank in the 1,500-10,000-gallon range with continuous mechanical agitation + abrasion-resistant pump + UHMW-PE or rubber-lined pipe-liner at the receipt + makedown + dosing line. Mild-steel construction is the cost-effective specification at the larger 50,000-2,000,000-gallon AMD-treatment + tailings-neutralization reaction-tank scale. OneSource Plastics' 5-brand HDPE network (Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, Bushman) covers the typical 1,500-10,000-gallon lime-slurry-makedown + day-tank + dosing-tank specification across the standard mining + AMD-treatment + utility + municipal envelope; primary 50,000-2,000,000-gallon AMD-treatment-reaction-tank + tailings-neutralization-tank scale typically calls mild-steel or FRP construction at qualified fabricator outside our HDPE 5-brand scope.
2. Real-World Industrial Use Cases
AMD-Treatment Lime Neutralization (Dominant Use). AMD-treatment plants neutralize 100-50000 gpm AMD feed at lime-slurry-dosed reaction tank to pH 8.5-10 + ferric-iron oxidation by aeration + ferrous-to-ferric oxidation + clarifier sedimentation + HDS sludge recycle + filtered + discharged at NPDES outfall. Lime dose 0.5-15 g/L hydrated-lime Ca(OH)2 depending on AMD acidity + iron + manganese + aluminum content. Storage envelope: HDPE rotomolded lime-makedown + day-tank + dosing-tank at 1,500-10,000-gallon scale within HDPE 5-brand scope; mild-steel + FRP HDS reaction tank + clarifier at 50,000-2,000,000-gallon scale typically OUTSIDE HDPE scope.
Tailings-Impoundment Lime Neutralization. Acidic tailings + tailings-thickener-overflow neutralization with lime-slurry to pH 8-10 at the tailings-disposal-area + tailings-decant-pond is routine at copper + zinc + nickel + uranium + coal + iron-ore tailings facility. Lime dose 0.5-5 g/L tailings depending on tailings acid generation + neutralization potential. Storage envelope: same as AMD-treatment.
SX-EW Iron-Bleed High-Density-Sludge HDS. Copper SX-EW raffinate iron-bleed at 1-10% of total raffinate flow is neutralized in HDS reaction tank with lime-slurry to pH 4-5 to precipitate iron as ferric-hydroxide + jarosite at recycled-sludge ratio 5-10:1 to maximize sludge density to 30-50% solids. Storage envelope: same as AMD-treatment.
Municipal Water + Wastewater Treatment. Municipal water-treatment plants use lime-slurry for softening + pH adjustment + coagulation aid; wastewater-treatment plants use lime-slurry for biosolids-stabilization (Class B + Class A under 40 CFR 503 biosolids rule) + phosphorus-precipitation + heavy-metal-precipitation. Lime dose 50-300 mg/L softening + 100-1000 mg/L stabilization. Storage envelope: 1,500-10,000-gallon HDPE makedown + dosing tank + 50,000-500,000-gallon mild-steel + FRP reaction tank.
Flue-Gas-Desulfurization FGD. Coal-fired power plant FGD scrubbers use lime + limestone slurry for SO2 + SO3 + HCl absorption; wet-scrubber + spray-dryer-absorber + circulating-dry-scrubber configurations consume 2000-20000 ton/year hydrated-lime per 500 MW unit. Storage envelope: 5,000-25,000-gallon HDPE or FRP lime-makedown tank within HDPE 5-brand scope at smaller sites + 50,000-1,000,000-gallon mild-steel + FRP reaction tank at major utility.
Pulp-and-Paper Mill Lime Cycle. Kraft pulp-mill recovery cycle uses lime-slaker + lime-mud-washer + lime-kiln to regenerate calcium-carbonate-to-quicklime to recausticize green-liquor to white-liquor for pulping. Storage envelope: lime-slaker + lime-mud-washer specialty equipment outside HDPE scope; HDPE rotomolded reagent + sample tank at adjacency 1,500-10,000-gallon scale.
3. Regulatory Framework
OSHA 29 CFR 1910.1200 + 1910.1000 Calcium-Hydroxide PEL. Calcium-hydroxide + calcium-oxide + calcium-carbonate OSHA PEL-TWA 5 mg/m3 respirable + 15 mg/m3 total + ACGIH TLV-TWA 5 mg/m3 + IDLH 25 mg/m3 (calcium-oxide). GHS classification: Skin Irritant Cat 2 + Eye Damage Cat 1 (causes serious eye damage) + STOT-RE Cat 3 respiratory-irritation. Worker SDS + container labeling + PPE + emergency-shower-eye-wash discipline.
MSHA 30 CFR 56/57 Surface-and-Underground Mine Standard. MSHA 30 CFR 56.5001 + 57.5001 lime + caustic-dust air-contaminant 5 mg/m3 + supplied-air-respirator at lime-bulk-receipt + slaker + makedown work.
ASTM C977 Quicklime + ASTM C25 Hydrated Lime + ASTM C5 Limestone Standards. ASTM C977 quicklime + C25 hydrated lime + C5 limestone + C593 lime-fly-ash + C50 sampling-and-testing of lime + AWWA B202 quicklime + AWWA B600 powdered-activated-carbon-and-coagulant + ANSI/NSF 60 drinking-water-treatment-chemical specifications cover the full mining + utility + water-treatment + cement + ironmaking + chemical industrial lime market.
40 CFR 503 Biosolids Class A and Class B. Lime-stabilized biosolids meet Class B pathogen-reduction at 12 hour exposure to pH 12 minimum or Class A pathogen + Vector-Attraction-Reduction at extended exposure to higher pH + temperature. Lime-dose discipline + retention-time + monitoring per 40 CFR 503.32 + 503.33 framework.
EPA NPDES + State Mining Discharge Permit. Lime-treated AMD + tailings effluent discharge to surface water requires state-specific mining-discharge permit + NPDES outfall + state water-quality criterion compliance + Discharge Monitoring Report DMR submission framework.
Title V Clean Air Act Fugitive-Dust + 40 CFR 50 + 60. Lime-bulk-storage silo + truck-receipt + slaker fugitive-dust per Title V state air permit + 40 CFR 50 NAAQS PM10 + PM2.5 + 40 CFR 60 NSPS + 40 CFR 63 NESHAP + state-specific lime-handling permit. Bag-house + ESP + wet-scrubber dust-control.
EPA SPCC + State Lime-Bulk-Storage Code. Lime-slurry storage requires double-liner + leak-detection + secondary-containment per state-specific bulk-storage code; lime-slurry + makedown-tank + day-tank inventory + closure-plan.
DOT 49 CFR 173. Hydrated-lime + quicklime dry-bulk pneumatic shipping + lime-slurry cargo-tank shipping is generally not regulated as hazardous; quicklime UN 1910 Calcium-oxide Class 8 PG III at packaged + bulk shipping specification + freezing-temperature precaution at lime-slurry winter delivery + dust-control at dry-bulk pneumatic transfer.
4. Storage System Specification
Bulk Lime Receiving Silo and Slaker (Outside HDPE Scope). Primary bulk-lime-receiving silo at 50-200 ton capacity uses welded-carbon-steel construction with bag-house + dust-collector + truck-pneumatic-receipt connection + slide-gate + screw-conveyor or pneumatic-conveyor to slaker or makedown station. On-site quicklime-slaker uses welded-carbon-steel + stainless-steel hot-water-jacket vessel with paddle agitator + temperature-monitoring at 80-95C + grit-removal hydrocyclone. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope; we refer those specifications to qualified silo + slaker fabricators.
Lime-Slurry Bulk Storage and Day-Tank (HDPE Scope). Lime-slurry bulk-storage + day-tank + dosing-tank at the mine site or treatment-plant 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 with cargo-tank cam-lock or slaker-discharge connection + atmospheric vent with filter; 2-3 inch flanged bottom outlet with full-bore PVC ball valve + abrasion-resistant valve trim; 18-24 inch top manway for inspection + cleaning; ultrasonic + radar level transmitter; sample valve at 12 inches above bottom outlet; gentle continuous mechanical agitator (top-mounted with bottom impeller at 50-150 rpm) OR continuous low-shear recirculating-pump loop (bottom outlet to top return at 50-300 gpm with abrasion-resistant progressive-cavity or hose pump) is MANDATORY at long-hold storage to prevent lime settling; insulated jacket + heat-trace at outdoor or cool-climate installation to maintain temperature 5-30C target; opaque-pigmented HDPE for UV protection at outdoor service.
HDS Reaction Tank and Sludge-Recycle Loop. AMD-treatment + tailings-neutralization HDS reaction tank at 50,000-2,000,000-gallon scale uses welded-carbon-steel or FRP vinyl-ester construction with 304 + 316L stainless-steel mixer impeller at 50-150 rpm + lime-slurry-dosing-pump + recycled-sludge-pump at 5-10:1 recycle ratio + clarifier sedimentation + sludge-thickener + sand-filter. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope.
Dosing-Pump and Transfer Equipment. Lime-slurry dosing at the AMD reaction tank + tailings discharge uses abrasion-resistant progressive-cavity + peristaltic + rotary-lobe pump with hardened-steel rotor + EPDM stator + variable-frequency drive at 0.5-50 gpm dosing rate + magnetic + Coriolis flow meter + pH-trim closed-loop control. Pipe construction is HDPE SDR 11 + UHMW-PE-lined or rubber-lined carbon-steel at high-velocity transfer.
Containment and Spill Pad. All lime-slurry bulk storage requires secondary containment per EPA SPCC + state-specific code; concrete-bermed pad with epoxy or polyurea liner; spill-collection sump with HDPE or PVDF transfer pump.
5. Field Handling Reality
Handler PPE. Lime-slurry bulk handling: nitrile or neoprene chemical-resistant glove specification at any contact, chemical splash goggles + face shield at any open-system handling, chemical-resistant Tyvek or equivalent suit at extended exposure, dust mask or P100 respirator at any open-system dry-pigment + slaker work, supplied-air respirator at quicklime-hydrator + bulk-pneumatic-receipt work above OSHA dust PEL, closed-toe steel-toe footwear with chemical-resistant overshoe, eye-wash station + emergency shower per OSHA 29 CFR 1910.151 within 10 seconds of work area.
Cargo-Tank Dry-Bulk Pneumatic Receipt and Slurry Tanker Receipt. Hydrated-lime + quicklime dry-bulk pneumatic-trailer receipt: 25-30 ton dry-bulk pneumatic trailer + 90-100 ton dry-bulk rail-car with bottom-discharge + top-fill pneumatic-conveyor connection + bag-house + dust-collector at silo. Lime-slurry tanker receipt: 5000-6500 gallon DOT 412 cargo tank with bottom-discharge + cam-lock + facility-side air-operated diaphragm pump or abrasion-resistant progressive-cavity pump.
Settling Discipline at Lime-Slurry Storage. Hydrated-lime slurry at 10-20% solids settles rapidly at static hold; continuous mechanical agitation at 50-150 rpm vertical impeller + bottom-recirculating-pump loop is mandatory at any storage longer than 1-4 hours. Static-hold tank requires 15-30-minute pre-use re-agitation + first-draw dump-to-recovery at any extended idle.
Scaling and Abrasion-Wear Discipline. Calcium-carbonate scale CaCO3 from CO2 absorption + calcium-sulfate gypsum CaSO4-2H2O at acid-neutralization product drives buildup at lime-slurry transfer-pipe interior + dosing-pump impeller + flow-control valve; routine acid-cleaning at 1-3 month frequency with HCl or weak-acid soak is mandatory. Hydrated-lime particle Mohs hardness 2-3 + pebble-lime to 4 drives accelerated abrasion-wear at pump impeller + pipe elbow + valve seat at high-velocity transfer; abrasion-resistant pump + UHMW-PE or rubber-lined pipe-liner is RECOMMENDED at long-service equipment; pipe-elbow inspection every 6-12 months.
Quicklime-Hydration Discipline. Quicklime CaO at on-site hydrator generates exothermic heat at 1200-1400 BTU/lb CaO + temperature spike to 80-95C + hydrogen-gas potential at trace + dust + caustic-mist; vented-enclosure hydrator + hot-water-jacket + insulation + supplied-air-respirator at adjacent worker is mandatory.
CO2-Absorption Discipline. Open-system lime-slurry tank absorbs atmospheric CO2 + forms CaCO3 scale + reduces alkalinity reagent-strength; sealed-tank specification with vent-filter or CO2-scrubber + nitrogen-blanket is preferred at high-purity application; agitation-driven slurry refresh at 24-72 hour frequency is standard at open-tank installation.
Cold-Weather-Freeze Discipline. Lime-slurry at 5-10C winter ground-water temperature is freeze-vulnerable + freezes at sub-zero-Celsius; insulated jacket + heat-trace + freeze-protection-recirculation at every outdoor tank + transfer-pipe is mandatory at northern installation. Freezing destroys slurry uniformity + drives caking + agglomeration.
QC Sampling and Verification. Each lime-slurry batch + dosing-tank + reaction-tank sample collection: total-solids by gravimetric oven-dry per ASTM C25 + AWWA B202, available-CaO + Ca(OH)2 by titration + neutralization-equivalent, particle-size by sieve + laser-diffraction, settled-volume by graduated-cylinder, pH continuous + grab confirmation.
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