Copper Electrolyte Tank Selection Tankhouse Refinery
Copper Electrolyte (Acidic Copper Sulfate Tankhouse Electrolyte at 35-50 g/L Cu + 150-180 g/L H2SO4 Free Acid with Minor Arsenic, Antimony, Bismuth, Lead, Nickel, Cobalt, Chloride, Thiourea, Glue, and Chloride-Dopant Bath-Conditioning Additive Matrix at SX-EW Solvent-Extraction-Electrowinning Tankhouse and ER Electrorefinery Tankhouse Cathode Production at Morenci, Bagdad, Sierrita, Ray, Tyrone, Chino, Bingham Canyon, Asarco Hayden, La Caridad, Cananea, Chuquicamata + El Teniente + Chagres + Andina + Salvador + Ventanas + Potrerillos, Antofagasta Centinela, Kennecott Copperton, Glencore Brunswick + Kidd Creek + CCR Montreal, KGHM Glogow, Aurubis Hamburg, Sumitomo Toyo Niihama, Korea Zinc Onsan, and Global Copper Refinery Operations) — Tank Selection at Tankhouse Process-Water, Acid-Makedown, Reagent, and Adjacency Service
Copper electrolyte (acidic copper sulfate tankhouse electrolyte; CAS 7758-99-8 copper sulfate pentahydrate + 7664-93-9 sulfuric acid + matrix of dissolved copper sulfate CuSO4-5H2O at 100-200 g/L CuSO4 + 35-50 g/L Cu metal + sulfuric acid H2SO4 at 150-180 g/L + arsenic + antimony + bismuth + lead + nickel + cobalt + iron + selenium + tellurium + chloride trace impurity at site-specific buildup; bath-conditioning additive matrix of thiourea CS(NH2)2 at 5-50 mg/L grain-refiner + animal-glue + lignin-sulfonate + Avitone + Reagent A at 10-100 mg/L leveling-additive + chloride-ion Cl- at 30-90 mg/L morphology-additive at SX-EW tankhouse and ER electrorefinery tankhouse; pH 0.5-1.5 strongly acidic; specific gravity 1.18-1.30; ORP +400 to +600 mV vs Ag/AgCl; temperature 35-50C tankhouse-warmed at electrolyte recirculation; supplied internally to the refinery at 5,000-2,000,000-gallon pregnant-electrolyte + spent-electrolyte + receiving-tank inventory between SX strip-train + electrowinning-cell + tankhouse + scavenger-cell + decopperization circuit; cathode product 99.99% copper at 220-380 A/m2 SX-EW current-density + 240-380 A/m2 ER current-density + 1.8-2.2 V SX-EW cell-voltage + 0.30-0.
U.S. Copper-cathode product internal to refinery + shipped as 99.99% Cu cathode at 200-pound bundles for downstream wire + rod + tube + sheet customer.
The eight sections below cite OSHA Hazard Communication 29 CFR 1910.1200 + 1910.1000 sulfuric-acid + acid-mist + 1910.1018 As + 1910.1025 Pb + 1910.1027 Cd PEL + MSHA 30 CFR 56/57 + EPA Method 6010 + 6020 metal analytical + 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 + State Reclamation Bond + State Aquifer Protection Permit + Title V Clean Air Act acid-mist + EPCRA 313 TRI framework at routine operating practice at North American + Latin-American + European + Asian copper SX-EW + ER tankhouse operations.
1. Material Compatibility Matrix
Copper electrolyte at typical 35-50 g/L Cu + 150-180 g/L H2SO4 + 35-50C + minor As + Sb + Bi + Pb + Ni + Co + Cl impurity is a strongly corrosive acidic process electrolyte with acid-corrosion + chloride-stress-corrosion + galvanic-corrosion + acid-mist-emission considerations on metallic construction. Lead-lined-steel + chemical-lead 99.99% Pb-Sb-6% antimony alloy at the tankhouse-cell + super-duplex + HC-22 alloy at the chloride-bearing service are the dominant cell-construction materials. HDPE + XLPE + FRP vinyl-ester + CPVC are dominant at the process-water + acid-makedown + reagent-makedown + adjacency outside the tankhouse cell. Note operating-discipline considerations: acid-mist discipline (electrowinning-cell evolves H2SO4 acid mist at 5-25 mg/m3 above the cell from oxygen-evolution at lead-anode + spray-droplet from current-density work; OSHA PEL-TWA 1 mg/m3 + ACGIH TLV-TWA 0.2 mg/m3 acid-mist; cell-house ventilation + acid-mist suppressant FOAM cover or HDPE bead-cover + acid-mist scrubber + supplied-air-respirator at sampling work is mandatory), chloride-corrosion discipline (chloride above 100 mg/L drives stainless-steel pitting + crevice + stress-corrosion-cracking at sample station + analytical-lab + electrowinning-cell + tankhouse busbar; high-chloride site — Mantos Blancos, chloride-leach Antofagasta — calls super-duplex 2507 or HC-22 + HC-276 alloy at affected component), additive-management discipline (thiourea + animal-glue + lignin-sulfonate + Avitone + chloride-dopant degrade + consume at the tankhouse cycle; routine analytical-lab assay + addition-makeup at 4-12 hour cycle is mandatory at quality-cathode production), and decopperization discipline (spent-electrolyte at scavenger-cell + decopperization-cell removes residual Cu before purge to acid-recovery or wastewater; lead-anode + 304 + 316L stainless-steel cathode-blank at scavenger-cell + 0.1-1 g/L Cu spent specification).
| Material | Cu Electrolyte @ 35C | Cu Electrolyte @ 50C | Notes |
|---|---|---|---|
| HDPE rotomolded | A | A | Standard at process-water + acid-makedown + bath-conditioning-makedown + reagent + sample + adjacency service across the 1,500-10,000-gallon range; opaque-pigmented for UV protection |
| XLPE rotomolded | A | A | Standard at higher-temperature electrolyte process-water service |
| Polypropylene (PP) | A | A | Standard at smaller acid-resistance specialty service |
| FRP vinyl-ester resin | A | A | Standard at larger pregnant-electrolyte + spent-electrolyte + receiving-tank service across the 50,000-2,000,000-gallon scale |
| FRP polyester resin | B | C | Acceptable at lower-temperature electrolyte only; not preferred at high-acid hot service |
| 304 stainless steel | C | NR | NOT recommended at electrolyte service due to acid + chloride attack; pitting + stress-corrosion-cracking risk |
| 316L stainless steel | C | NR | NOT recommended at high-chloride electrolyte site; acceptable at low-chloride sample-station only |
| Duplex 2205 / 2507 | B | B | Acceptable at higher-chloride electrolyte sample-station + analytical-lab service |
| Super-duplex / 6Mo / HC-22 / HC-276 | A | A | Premium at electrowinning-cell + tankhouse busbar + high-chloride site + chloride-bearing scavenger-cell |
| Carbon steel uncoated | NR | NR | NOT recommended; rapid acid corrosion |
| Carbon steel rubber-lined | A | A | Standard at primary electrolyte receiving + circulation tank; natural-rubber or chlorobutyl-rubber liner |
| Lead-lined steel | A | A | STANDARD at electrowinning-cell + tankhouse-cell construction; chemical-lead 99.99% Pb-Sb 6% antimony alloy lining at cell-wall + cell-bottom |
| Chemical-lead 99.99% | A | A | STANDARD at electrowinning-cell wall + bottom + anode-bag + acid-mist-cover |
| EPDM | A | A | Standard gasket + lining at electrolyte service |
| Viton (FKM) | A | A | Standard at higher-temperature electrolyte pump + valve seat |
| Nitrile (Buna-N) | B | C | Acceptable at brief contact only; not preferred at long-hold |
| PVC Sch 80 | A | B | Standard at piping at electrolyte service to 50C; temperature-derated above 50C |
| CPVC Sch 80 | A | A | Preferred at higher-temperature electrolyte piping |
| HDPE 60-mil + 80-mil geomembrane liner | A | A | STANDARD at tankhouse secondary-containment + acid-pad + bermed-pad liner |
The dominant industrial pattern at North American + Latin-American + European + Asian copper SX-EW + ER tankhouse operations is lead-lined-steel + chemical-lead 99.99% Pb-Sb 6% antimony alloy electrowinning-cell construction with super-duplex + HC-22 alloy at chloride-bearing service, FRP vinyl-ester resin or rubber-lined carbon-steel construction at the larger 50,000-2,000,000-gallon pregnant-electrolyte + spent-electrolyte + receiving-tank vessel, and HDPE rotomolded tank at the 1,500-10,000-gallon process-water + acid-makedown + bath-conditioning-makedown + reagent + 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-tankhouse-adjacency specification across the standard envelope; primary tankhouse-cell + 50,000-2,000,000-gallon pregnant-electrolyte + spent-electrolyte vessel typically calls lead-lined-steel + super-duplex + FRP vinyl-ester construction outside our HDPE 5-brand scope; we refer those specifications to qualified lead-lined-steel + super-duplex + FRP tank fabricators.
2. Real-World Industrial Use Cases
SX-EW Solvent-Extraction-Electrowinning Tankhouse (Dominant Use at Hydromet Cu). SX-EW circuit extracts copper from PLS into kerosene + LIX-class oxime extractant at extraction-train (1-3 stages countercurrent) + back-extracts copper from organic into spent-electrolyte at strip-train (1-2 stages countercurrent) + electrowins copper at lead-anode + stainless-blank cathode in tankhouse at 1.8-2.2 V cell-voltage + 220-380 A/m2 current-density + 35-50C temperature + 35-50 g/L Cu + 150-180 g/L H2SO4 electrolyte. Pregnant-electrolyte + spent-electrolyte loop circulates between strip-train + tankhouse-cell at 5,000-100,000 gpm flow rate. Storage envelope: lead-lined-steel + super-duplex tankhouse-cell + FRP vinyl-ester or rubber-lined-steel pregnant-electrolyte + spent-electrolyte + receiving-tank typically OUTSIDE HDPE scope; HDPE rotomolded process-water + acid-makedown + reagent + sample at 1,500-10,000-gallon scale within HDPE 5-brand scope.
ER Electrorefinery Tankhouse (Dominant Use at Pyro Cu). ER electrorefinery dissolves anode-grade copper (98-99% Cu cast at smelter) at lead-lined cell with stainless-steel-blank cathode at 0.30-0.40 V cell-voltage + 240-380 A/m2 current-density + 35-50C electrolyte temperature + 35-50 g/L Cu + 150-180 g/L H2SO4 + thiourea + glue + chloride-additive. Anode-slime drops from anode-bag + collected at cell-bottom for downstream PGM + Au + Ag + Se + Te recovery. Storage envelope: same as SX-EW.
Anode-Slime Recovery and PGM-Au-Ag Refinery. ER anode-slime collected at cell-bottom contains Au + Ag + Pt + Pd + Rh + Se + Te + Bi + Pb + Sb + As at high-grade recovery. Storage envelope: dedicated PGM-refinery vessel typically OUTSIDE HDPE scope; HDPE adjacency at the support service.
Decopperization Scavenger-Cell. Spent-electrolyte from main tankhouse-cell at 35-50 g/L Cu + 150-180 g/L H2SO4 is decopperized at scavenger-cell to 0.1-1 g/L Cu + recycled to acid-makedown + secondary-acid-recovery for downstream zinc + nickel-cobalt-PGM smelter use. Storage envelope: same as main tankhouse.
Process-Water and Reagent Adjacency. Sulfuric-acid + thiourea + animal-glue + lignin-sulfonate + Avitone + chloride-dopant bath-conditioning + makeup-water + sample + analytical-lab adjacency at the tankhouse uses HDPE rotomolded 1,500-10,000-gallon storage in the standard refinery 5-brand network, with sulfuric-acid bulk storage at 5,000-25,000-gallon FRP vinyl-ester typically outside HDPE scope.
3. Regulatory Framework
OSHA 29 CFR 1910.1200 + 1910.1000 + 1910.1018 + 1910.1025 Standards. Sulfuric acid + acid-mist OSHA PEL-TWA 1 mg/m3 + ACGIH TLV-TWA 0.2 mg/m3 + IDLH 15 mg/m3. Arsenic OSHA PEL-TWA 0.010 mg/m3 + 1910.1018 inorganic-arsenic standard. Lead OSHA PEL-TWA 0.050 mg/m3 + 1910.1025 lead standard + 30 ug/dL trigger blood-lead biological-monitoring + medical-removal at 50 ug/dL. Cobalt + soluble cobalt + nickel + soluble nickel IARC carcinogen + skin-sensitizer + STOT-RE Cat 1 framework.
MSHA 30 CFR 56/57 Surface-and-Underground Mine Standards. MSHA 30 CFR 56.5001 + 57.5001 acid-mist + heavy-metal air-contaminant + supplied-air-respirator at electrowinning-cell + tankhouse + acid-makedown + sampling work above OSHA PEL.
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 + Ni + Co + As + Sb + Bi + Pb + Cd + Cr + Hg + Zn + Se + Te + minor metal at electrolyte + spent-electrolyte + cathode + anode-slime sample collection.
EPA NPDES + State Mining Discharge Permit. Copper-bearing electrolyte purge + tankhouse-effluent discharge to surface water requires state-specific mining-discharge permit + NPDES outfall + state water-quality criterion compliance + Discharge Monitoring Report DMR submission framework.
EPA SPCC + State Copper-Bearing Process-Solution Code. Copper-bearing electrolyte storage requires double-liner + leak-detection + secondary-containment per state-specific process-solution code; pregnant-electrolyte + spent-electrolyte + receiving-tank inventory + closure-plan.
EPA RCRA Subtitle C Bevill Exemption. Copper-mine ore + tailings + electrolyte generally qualify for Bevill exemption to RCRA Subtitle C under 40 CFR 261.4(b)(7) at most SX-EW operations. ER tankhouse spent-electrolyte + anode-slime + scavenger-cell discharge may be subject to characteristic hazardous waste classification at site-specific evaluation.
EPCRA + TRI Reporting. Copper-refinery TRI-reporting threshold per EPCRA 313 + 40 CFR 372 covers Cu + Pb + As + Cd + Cr + Ni + Hg + Zn + Sb + sulfuric acid releases at the SX-EW + ER tankhouse + tailings facility annual reporting framework.
Title V Clean Air Act Acid-Mist Standard + 40 CFR 63 NESHAP. Copper-refinery tankhouse fugitive acid-mist + heavy-metal-mist per Title V state air permit + 40 CFR 50 NAAQS + 40 CFR 60 NSPS + 40 CFR 63 NESHAP for Primary-Copper-Smelting + Secondary-Copper-Smelting + Primary-Copper-Smelter-Facility framework. Acid-mist scrubber + bag-house + ESP + monitoring framework.
4. Storage System Specification
Tankhouse-Cell Construction (Lead-Lined Steel + Super-Duplex; Outside HDPE Scope). Primary electrowinning-cell + electrorefinery-cell construction uses lead-lined-steel + chemical-lead 99.99% Pb-Sb 6% antimony alloy lining at cell-wall + cell-bottom + chemical-lead anode-bag + super-duplex 2507 or HC-22 alloy at chloride-bearing service + 304 + 316L stainless cathode-blank or stainless-steel-cathode + acid-mist suppressant FOAM cover or HDPE bead-cover + acid-mist scrubber. Construction at qualified lead-lined-steel + super-duplex tank fabricator. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope; we refer those specifications to qualified lead-lined-steel + super-duplex tank fabricators.
Pregnant-Electrolyte and Spent-Electrolyte Tank (Outside HDPE Scope). Primary pregnant-electrolyte + spent-electrolyte + receiving-tank 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.
Process Water, Acid-Makedown, Bath-Conditioning, and Reagent Tank (HDPE Scope). Process-water + sulfuric-acid-makedown + thiourea-makedown + animal-glue-makedown + lignin-sulfonate-makedown + Avitone-makedown + chloride-dopant-makedown + sample + analytical-lab adjacency at the tankhouse 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.
Acid-Mist Scrubber and Cell-House Ventilation. Cell-house ventilation at 50-200 air-changes-per-hour + acid-mist suppressant FOAM cover + HDPE bead-cover or expanded-PE bead-cover + acid-mist scrubber at the cell-house exhaust uses FRP vinyl-ester scrubber + super-duplex demister + acid-mist HEPA-grade filter + heat-exchanger outside HDPE scope.
Containment and Spill Pad. All copper-electrolyte storage requires secondary containment per EPA SPCC + state-specific code; concrete-bermed pad with HDPE primary + secondary liner + leak-detection sump + acid-resistant epoxy or polyurea topcoat.
5. Field Handling Reality
Handler PPE. Copper-tankhouse handling: chemical-resistant Tyvek or equivalent suit at any open-system electrolyte work, double nitrile chemical-resistant glove at any contact, chemical splash goggles + face shield at any open-system handling, supplied-air respirator at electrowinning-cell + tankhouse + acid-makedown work above OSHA acid-mist PEL, half-mask air-purifying respirator with acid-gas-cartridge at routine open-system work, FRC + acid-suit at the cell-house, steel-toe boots with chemical-resistant overshoe, eye-wash + emergency shower per OSHA 29 CFR 1910.151 within 10 seconds of work area, designated-trained tankhouse worker per OSHA 29 CFR 1910.1450 + MSHA Part 46 + Part 48 + OSHA 1910.1018 As + 1910.1025 Pb biological-monitoring framework at affected work zone.
Acid-Mist Discipline at Cell-House. Electrowinning + electrorefinery cell evolves H2SO4 acid mist at 5-25 mg/m3 above the cell from oxygen-evolution at lead-anode + spray-droplet from current-density work. Cell-house ventilation at 50-200 air-changes-per-hour + acid-mist suppressant FOAM cover + HDPE bead-cover or expanded-PE bead-cover at every cell + acid-mist scrubber at the cell-house exhaust + supplied-air-respirator at sampling + cell-cleaning + cathode-stripping work is mandatory.
Heavy-Metal Worker Discipline. Lead + arsenic + cobalt + nickel air-contaminant + skin-sensitization + biological-monitoring per OSHA 29 CFR 1910.1018 As + 1910.1025 Pb + 1910.1027 Cd standards. Annual medical-surveillance + blood-lead + urine-arsenic + urine-cobalt + urine-nickel monitoring at every cell-house worker.
Additive-Management Discipline. Thiourea + animal-glue + lignin-sulfonate + Avitone + chloride-dopant degrade + consume at the tankhouse cycle; routine analytical-lab assay + addition-makeup at 4-12 hour cycle is mandatory at quality-cathode production. Excess-additive drives nodulation + cathode-rejection + cell-stoppage; under-additive drives rough-cathode + lead-contamination from anode-cake.
Chloride-Corrosion Discipline. Chloride above 100 mg/L drives stainless-steel pitting + crevice + stress-corrosion-cracking at sample station + analytical-lab + electrowinning-cell + tankhouse busbar. 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.
Decopperization Discipline. Spent-electrolyte at scavenger-cell + decopperization-cell removes residual Cu before purge to acid-recovery or wastewater; lead-anode + 304 + 316L stainless-steel cathode-blank at scavenger-cell + 0.1-1 g/L Cu spent specification at the routine cycle.
Cargo-Tank Receipt of Sulfuric Acid and Bath Additive. Sulfuric-acid bulk receipt at 5,000-25,000-gallon FRP vinyl-ester storage + thiourea + glue + lignin-sulfonate + Avitone + chloride-dopant receipt at 250-330-gallon poly tote or 5,000-15,000-gallon HDPE makedown. PPE + transfer-rate-monitoring + secondary-containment + emergency-deluge framework.
QC Sampling and Verification. Each pregnant-electrolyte + spent-electrolyte + cathode + anode-slime sample collection: Cu + Fe + Ni + Co + As + Sb + Bi + Pb + Cd + Cr + Hg + Zn + Se + Te + Cl + acid + thiourea + glue + lignin-sulfonate per EPA Method 6010 + 6020 ICP + analytical-lab additive titration + spectrophotometry, pH continuous + grab confirmation, ORP, conductivity, density, organic-entrainment by phase-disengagement test, current-density + cell-voltage continuous + Hall-cell rating monthly.
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