Copper Raffinate Tank Selection SX-EW Mining

Copper Raffinate (Post-Extraction Copper-Depleted Barren Raffinate at 0.05-0.5 g/L Cu and 1-5 g/L H2SO4 Free Acid with Iron, Manganese, Magnesium, Calcium, Aluminum, and Chloride Impurity Matrix Recovered from SX-EW Mixer-Settler Extraction Stage and Recirculated to Copper Heap-Leach, Dump-Leach, Tank-Leach, In-Situ-Leach, and Run-of-Mine Leach Pad Operations at Morenci, Bagdad, Sierrita, Ray, Tyrone, Chino, and Latin-American Copper Mine Hydrometallurgy) — Tank Selection at Raffinate Pond, Raffinate Tank, Acid-Makeup, and Heap-Pad Recirculation Service

Copper raffinate (post-extraction copper-depleted barren raffinate; CAS not registered as a single substance — matrix of dissolved residual copper sulfate CuSO4 + sulfuric acid H2SO4 + ferric and ferrous sulfate + manganese sulfate + magnesium sulfate + calcium sulfate + aluminum sulfate + chloride + minor metal impurities recovered from copper-extraction stage of SX mixer-settler exiting at the aqueous-phase outlet of the extraction train; typical analysis 0.05-0.5 g/L Cu residual + 1-5 g/L H2SO4 free acid + 1-5 g/L Fe + 0.05-2 g/L Mn + 1-15 g/L Mg + 0.1-1 g/L Ca + 0.1-2 g/L Cl + 0.5-3 g/L Al + minor Co + Ni + Zn at site-specific buildup; pH 1.0-2.5; specific gravity 1.02-1.10; ORP +400 to +600 mV vs Ag/AgCl; temperature 25-50C ambient or solar-warmed; recycled to heap-leach + dump-leach + tank-leach pad makeup at sulfuric-acid trim + iron-bleed + crud-control discipline; raffinate iron + manganese + magnesium + chloride buildup at recirculation cycle drives jarosite + ferric-hydroxide precipitation + calcium-sulfate gypsum scaling + chloride-corrosion at downstream stainless steel + electrowinning-cell + sample station; raffinate bleed-stream + neutralization + iron-precipitation pond is routine site impurity-management practice) is the dominant recirculating barren-aqueous process solution at modern copper hydrometallurgy SX-EW operations across Arizona (Morenci, Bagdad, Sierrita, Ray, Mission, Silver Bell, Pinto Valley, Mineral Park), New Mexico (Tyrone, Chino, Cobre), Nevada (Robinson, Yerington), Utah (Bingham Canyon), Texas (Asarco), Mexico (La Caridad, Cananea, Buenavista del Cobre), Chile (Escondida, Collahuasi, Spence, Antucoya, Lomas Bayas, Sierra Gorda, Centinela, Mantos Blancos), Peru (Cerro Verde, Toquepala, Cuajone), Argentina (Bajo de la Alumbrera), and global copper-mining hydromet, providing the closed-loop barren-aqueous makeup that returns raffinate to the heap pad after copper extraction.

U.S. Raffinate is internal to the mine + never shipped off-site. Sulfuric-acid + emulsifier + reagent + flocculant + lime + dispersant + water-makeup chemistry trim is delivered from external suppliers (PVS Chemicals + Univar Solutions + Brenntag North America + BASF + Solvay).

The eight sections below cite OSHA Hazard Communication 29 CFR 1910.1200 + 1910.1000 sulfuric-acid PEL + MSHA 30 CFR 56/57 surface-mine acid-mist + EPA Method 6010 + 6020 ICP-OES + ICP-MS metal analytical + EPA Method 9040 pH + EPA NPDES + state-specific mining-discharge permit + EPA SPCC + state-specific copper-bearing process-solution code + EPA RCRA Bevill exemption + Bureau of Land Management Mine Plan of Operations + Forest Service Plan of Operations + State Reclamation Bond + State Aquifer Protection Permit (Arizona ADEQ APP, Nevada NDEP WPCP, New Mexico NMED Discharge Permit, Utah DEQ Groundwater Protection, Mexico SEMARNAT, Chile SMA + RCA, Peru OEFA + ANA) + state mining-permit framework at routine operating practice at North American + Latin-American copper SX-EW operations.

1. Material Compatibility Matrix

Copper raffinate at typical 0.05-0.5 g/L Cu + 1-5 g/L H2SO4 + 1-5 g/L Fe + Mn + Mg + Ca + Al + Cl impurity matrix + pH 1.0-2.5 + 25-50C is a moderately corrosive recirculating acidic barren process solution with acid-corrosion + chloride-stress-corrosion + galvanic-corrosion + gypsum-scaling considerations on metallic construction. HDPE + XLPE + FRP + PP + CPVC + PVC are the dominant polymeric construction materials at raffinate service across the SX raffinate tank + raffinate pond + heap-pad-makeup distribution + acid-makeup-tank + iron-bleed pond network. Note operating-discipline considerations: gypsum-scaling discipline (calcium-sulfate gypsum CaSO4-2H2O at saturation drives scale buildup at heap-pad distribution drip-emitter + raffinate-pond outlet + raffinate-pump impeller + sample-station + heat-exchanger surface; routine acid-cleaning or HCl-cleaning at 6-month frequency is standard at high-Ca site), chloride-corrosion discipline (chloride above 100 mg/L drives stainless-steel pitting + crevice corrosion at sample station + analytical lab; high-chloride site — Mantos Blancos, Antofagasta district — calls super-duplex 2507 or HC-22 alloy at affected component), iron-buildup discipline (raffinate iron at 1-5 g/L Fe drives jarosite + ferric-hydroxide precipitation at downstream neutralization + lime-makedown step; iron-bleed-stream + iron-precipitation pond at 50,000-500,000-gallon scale is routine site practice), and crud-control discipline (raffinate downstream of mixer-settler carries entrained organic + solid crud at 50-500 ppm; raffinate carbon-column or coalescer or filter-bed at the SX exit is routine to recover entrained organic + protect heap-pad drip-emitter).

The dominant industrial pattern at North American + Latin-American copper SX-EW operations is HDPE 60-mil or 80-mil double-liner pond at raffinate pond + iron-bleed pond + event pond, FRP vinyl-ester resin or rubber-lined carbon-steel construction at the larger 50,000-2,000,000-gallon raffinate-recycle tank + heap-pad-distribution-header vessel, and HDPE rotomolded tank at the 1,500-10,000-gallon acid-makeup + flocculant + lime-makedown + sample + analytical-lab + adjacency service. OneSource Plastics' 5-brand HDPE network (Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, Bushman) covers the typical 1,500-10,000-gallon copper-mine raffinate-adjacency specification across the standard hydromet envelope; primary 50,000-2,000,000-gallon raffinate-recycle tank + heap-pad-distribution-header vessel typically calls FRP vinyl-ester or rubber-lined carbon-steel construction outside our HDPE 5-brand scope; we refer those specifications to qualified FRP + lined-steel tank fabricators.

2. Real-World Industrial Use Cases

SX-EW Raffinate Recycle to Heap-Leach Pad (Dominant Use). Copper hydromet operations recover raffinate from the aqueous-phase outlet of the SX extraction train at 0.05-0.5 g/L Cu residual + 1-5 g/L H2SO4 + iron + manganese + magnesium + chloride buildup, and recycle to the heap-pad distribution-header at 0.005-0.015 gpm/ft2 application rate after sulfuric-acid trim makeup + iron-bleed-stream + makeup-water trim. The raffinate-recycle loop is the closed-loop barren-aqueous makeup that drives 60-365-day continuous heap-leach operation. Storage envelope: HDPE 60-mil + 80-mil double-liner raffinate pond at 5-100 million-gallon scale; FRP vinyl-ester or rubber-lined carbon-steel raffinate-recycle tank + heap-pad-distribution-header at 50,000-2,000,000-gallon scale; HDPE rotomolded tank at the acid-makeup + flocculant + lime-makedown + sample + analytical-lab + adjacency 1,500-10,000-gallon scale.

Iron-Bleed Stream and Iron-Precipitation Pond. Raffinate iron buildup at 3-10 g/L Fe drives sidestream iron-bleed at 1-10% of total raffinate flow to dedicated iron-precipitation pond + lime-neutralization reaction-tank at high-density-sludge HDS process; iron-precipitation reduces raffinate iron to 0.5-2 g/L Fe + recycled raffinate returns to main raffinate-recycle loop. Storage envelope: HDPE 60-mil + 80-mil double-liner iron-precipitation pond + 50,000-500,000-gallon FRP or rubber-lined-steel HDS reaction tank typically OUTSIDE HDPE scope; HDPE rotomolded lime-makedown + flocculant + reagent at 1,500-10,000-gallon scale within HDPE 5-brand scope.

Sulfuric-Acid Makeup Trim. Sulfuric-acid trim at 1-5 kg/m3 raffinate to maintain pH 1.0-2.5 + free-acid 1-5 g/L H2SO4 specification; acid-makeup at the raffinate recycle line uses HDPE rotomolded acid-makeup tank at 1,500-10,000-gallon scale with FRP or rubber-lined carbon-steel sulfuric-acid bulk supply at 5,000-25,000-gallon scale. Routine acid-trim discipline at the recycle-loop control system maintains heap-leach acidity.

Solution-Mining In-Situ Leach Raffinate. Florence Copper + Excelsior Gunnison + Taseko Florence-style in-situ leach operations recover raffinate from the surface SX circuit + reinject to the in-situ wellfield at 0.005-0.015 gpm/ft2 well-injection rate. Storage envelope: HDPE rotomolded acid-makeup + reagent + sample tank at 1,500-10,000-gallon scale + FRP or rubber-lined raffinate recycle tank.

Tankhouse Spent-Electrolyte Recycle. SX-EW tankhouse spent-electrolyte at 35-50 g/L Cu + 150-180 g/L H2SO4 returns to SX strip-train as the strip-stream + recovers copper from loaded organic + recycles back to electrowinning at the pregnant-electrolyte side. Storage envelope: lead-lined or rubber-lined-steel pregnant + spent-electrolyte tank typically OUTSIDE HDPE 5-brand scope; HDPE adjacency reagent + sample at the tankhouse.

3. Regulatory Framework

OSHA 29 CFR 1910.1200 + 1910.1000 Sulfuric Acid PEL. Sulfuric acid + acid-mist OSHA PEL-TWA 1 mg/m3 + ACGIH TLV-TWA 0.2 mg/m3 + IDLH 15 mg/m3. Raffinate at 1-5 g/L H2SO4 dilute matrix is classified Skin Irritant Cat 2 + Eye Irritant Cat 2 at GHS framework + worker SDS + container labeling + PPE + emergency-shower-eye-wash discipline.

MSHA 30 CFR 56/57 Surface-Mine Acid-Mist Standard. MSHA 30 CFR 56.5001 + 57.5001 acid-mist air-contaminant 1 mg/m3 + supplied-air-respirator at acid-makedown + sampling work.

EPA Method 6010 + 6020 ICP-OES + ICP-MS Metal Analytical. EPA SW-846 Method 6010 + 6020 + 7470 + 7471 + 200.7 + 200.8 metal analytical for Cu + Fe + Mn + Mg + Ca + Al + Pb + As + Cd + Cr + Ni + Co + Hg + Zn at raffinate + iron-bleed + groundwater + outfall + tailings sample collection.

EPA NPDES + State Mining Discharge Permit. Copper-bearing raffinate + iron-bleed + tailings discharge to surface water requires state-specific mining-discharge permit + NPDES outfall + tailings-impoundment + reclamation-bond framework. State-specific aquifer-protection permit (Arizona ADEQ APP, Nevada NDEP WPCP, New Mexico NMED Discharge Permit, Utah DEQ Groundwater Protection) requires double-liner + leak-detection + groundwater monitoring well + closure-plan + reclamation-bond.

EPA SPCC + State Copper-Bearing Process-Solution Code. Copper-bearing raffinate + iron-bleed solution storage requires double-liner + leak-detection + secondary-containment per state-specific process-solution code; raffinate-pond + iron-bleed-pond + event-pond + stormwater-pond inventory + closure-plan.

Bureau of Land Management + Forest Service + State Mining Permit. Federal-land copper hydromet operations require BLM Mine Plan of Operations + Forest Service Plan of Operations + state mining permit + reclamation bond + closure-plan + financial-assurance framework. State-specific reclamation bond is mandatory at Arizona AAC R11-13 + Nevada NAC 519A + New Mexico NMED MMD + Utah Mining Reclamation Plan + 1872 General Mining Law framework.

EPA RCRA Subtitle C Bevill Exemption. Copper-mine ore + tailings + raffinate + iron-bleed sludge generally qualify for Bevill exemption to RCRA Subtitle C under 40 CFR 261.4(b)(7) at most heap-leach + SX-EW operations. Iron-precipitation HDS sludge may be subject to characteristic hazardous waste classification at site-specific evaluation.

EPCRA + TRI Reporting. Copper-mine TRI-reporting threshold per EPCRA 313 + 40 CFR 372 covers Cu + Pb + As + Cd + Cr + Ni + Hg + Zn + sulfuric acid releases at the mine-site SX-EW + tankhouse + tailings facility annual reporting framework.

4. Storage System Specification

Heap-Leach Pad and Raffinate Pond HDPE Geomembrane Liner. Copper heap-leach pad + raffinate pond + iron-bleed pond + event pond + stormwater pond uses HDPE 60-mil or 80-mil double-liner construction with primary + secondary liner separated by geonet drainage layer + leak-detection sump + GCL or compacted-clay subliner per state-specific aquifer-protection permit. Liner installation by qualified geomembrane installer with electric leak-detection survey at acceptance per ASTM D7007. Heap-pad raffinate distribution piping is HDPE SDR 11 or SDR 17 with drip-emitter at the standard 0.005-0.015 gpm/ft2 application rate.

Raffinate-Recycle Tank and Heap-Pad-Distribution-Header (Outside HDPE Scope). Primary raffinate-recycle tank + heap-pad-distribution-header + iron-bleed reaction vessel at 50,000-2,000,000-gallon scale uses FRP vinyl-ester resin construction or rubber-lined carbon-steel construction with natural-rubber or chlorobutyl-rubber liner. Construction at qualified FRP or lined-steel tank fabricator with NDE inspection + holiday-test on liner. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope; we refer those specifications to qualified FRP + lined-steel tank fabricators.

Acid-Makeup, Lime-Makedown, and Reagent Tank (HDPE Scope). Sulfuric-acid trim makeup tank + lime-makedown + flocculant-makedown + emulsifier-makedown + LIX-reagent-storage + sample + analytical-lab adjacency at the mine site 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.

Iron-Precipitation HDS Reactor. Iron-precipitation high-density-sludge reaction tank at 50,000-500,000-gallon scale uses FRP vinyl-ester or rubber-lined carbon-steel construction with EPDM or chlorobutyl gasket + 304 + 316L stainless-steel mixer impeller + lime-slurry-dosing-pump + recycled-sludge-pump. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope.

Containment and Spill Pad. All copper-bearing raffinate + iron-bleed storage requires secondary containment per EPA SPCC + state-specific aquifer-protection permit; concrete-bermed pad with HDPE primary + secondary liner + leak-detection sump + acid-resistant epoxy or polyurea topcoat.

5. Field Handling Reality

Handler PPE. Copper-mine raffinate handling: chemical-resistant Tyvek or equivalent suit at any open-system raffinate work, double nitrile chemical-resistant glove at any contact, chemical splash goggles + face shield at any open-system handling, half-mask air-purifying respirator with acid-gas-cartridge at routine open-system work, supplied-air respirator at acid-makedown + iron-bleed-reaction work above OSHA acid-mist PEL, steel-toe boots with chemical-resistant overshoe, eye-wash station + emergency shower per OSHA 29 CFR 1910.151 within 10 seconds of work area, designated-trained acid-area worker per OSHA 29 CFR 1910.1450 + MSHA Part 46 + Part 48 framework.

Gypsum-Scaling Discipline at Heap-Pad Distribution. Calcium-sulfate gypsum CaSO4-2H2O at saturation drives scale buildup at heap-pad distribution drip-emitter + raffinate-pond outlet + raffinate-pump impeller + sample-station + heat-exchanger surface; routine acid-cleaning at HCl + nitric acid soak + mechanical-rod descaling at 6-month frequency is standard at high-Ca site (Mantos Blancos + Cu-Au porphyry districts with high-Ca mineralogy).

Chloride-Corrosion Discipline at Stainless Steel. Chloride above 100 mg/L in raffinate drives stainless-steel pitting + crevice + stress-corrosion-cracking at sample-station + analytical-lab + downstream electrowinning-cell. Site chloride budget management via raffinate iron precipitation + bleed-stream + ion-exchange treatment is routine; high-chloride site (Mantos Blancos + chloride-leach Antofagasta) calls super-duplex 2507 or HC-22 + HC-276 alloy at affected component.

Iron-Buildup Discipline. Raffinate iron at 3-10 g/L Fe drives sidestream iron-bleed at 1-10% of total raffinate flow to dedicated iron-precipitation pond. Iron-precipitation reduces raffinate iron to 0.5-2 g/L Fe + recycled raffinate returns to main raffinate-recycle loop. Routine iron-bleed-rate management at the SX raffinate exit + impurity-budget tracking is mandatory for stable extraction-stage performance.

Crud-Control Discipline at Raffinate Exit. Raffinate downstream of mixer-settler carries entrained organic + solid crud at 50-500 ppm; raffinate carbon-column or coalescer or filter-bed at the SX exit recovers entrained organic + protects heap-pad drip-emitter + raffinate-pump from blockage + extraction-stage organic-loss.

Cargo-Tank Receipt of Sulfuric Acid and Reagent. Sulfuric-acid bulk receipt at 5,000-25,000-gallon FRP vinyl-ester storage + LIX-class reagent receipt at 250-330-gallon poly tote + lime-slurry receipt at 5,000-25,000-gallon HDPE storage. PPE + transfer-rate-monitoring + secondary-containment + emergency-deluge framework.

QC Sampling and Verification. Each raffinate + iron-bleed + acid-makeup sample collection: Cu + Fe + Mn + Mg + Ca + Al + Cl + acid + impurity per EPA Method 6010 + 6020 ICP, pH continuous + grab confirmation, ORP, conductivity, density, organic-entrainment by phase-disengagement test, crud-content by gravimetric.

Spill Response. Raffinate + iron-bleed spill response: small-volume spill is contained at secondary-containment + neutralized in place with lime + sodium-hydroxide to pH 8-10 + transferred via vacuum-truck to event-pond. Large-volume spill triggers state-agency notification + downstream water-quality sampling + remediation per state aquifer-protection permit.

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