Nickel Electrolyte Tank Selection Tankhouse Refinery
Nickel Electrolyte (Acidic Nickel Sulfate and Nickel Chloride Tankhouse Electrolyte at 60-90 g/L Ni Metal in Sulfate-Electrolyte at 5-50 g/L H2SO4 Free Acid or Chloride-Electrolyte at 60-100 g/L NaCl Sodium Chloride with Boric Acid pH-Buffer + Wetting Agent + Cobalt + Iron + Copper + Zinc + Manganese + Magnesium Trace Impurity Matrix at Diaphragm-Cell Catholyte and Anolyte Compartments for Nickel Cathode Production at Vale Long Harbour Newfoundland, Sherritt International Fort Saskatchewan Alberta + Moa Cuba, Glencore Nikkelverk Norway + Sudbury Ontario, Umicore Hoboken Belgium + Olen, Nickel West Kalgoorlie + Mt Keith + Murrin + Cawse Western Australia, KGHM Glogow Poland, Sumitomo Niihama Japan, Norilsk Nickel Severonickel + Polar Division Russia, and Global Nickel Refinery Operations) — Tank Selection at Tankhouse Process-Water, Acid-Makedown, Reagent, and Adjacency Service
Nickel electrolyte (acidic nickel sulfate or nickel chloride tankhouse electrolyte; CAS 10101-97-0 nickel sulfate hexahydrate + 7718-54-9 nickel chloride hexahydrate + 7664-93-9 sulfuric acid + 10043-35-3 boric acid + 7647-14-5 sodium chloride; matrix of dissolved nickel sulfate NiSO4-6H2O at 250-400 g/L NiSO4 + 60-90 g/L Ni metal + sulfuric acid H2SO4 at 5-50 g/L free acid in sulfate-electrolyte process or nickel chloride NiCl2-6H2O + 60-100 g/L NaCl + 60-90 g/L Ni metal in chloride-electrolyte diaphragm-cell process + boric acid H3BO3 at 25-50 g/L pH-buffer + wetting-agent + sodium-lauryl-sulfate or polyethylene-glycol additive at 50-200 mg/L + cobalt + iron + copper + zinc + manganese + magnesium + ammonium + chloride trace impurity at site-specific buildup; pH 2.5-4.5 sulfate-electrolyte or pH 1.5-3.5 chloride-electrolyte; specific gravity 1.20-1.45; ORP +400 to +600 mV vs Ag/AgCl; temperature 50-80C tankhouse-warmed at electrolyte recirculation; supplied internally to the refinery at 5,000-2,000,000-gallon catholyte + anolyte + receiving-tank inventory between solvent-extraction strip-train + electrowinning-cell + tankhouse + scavenger-cell + decopperization circuit; cathode product 99.95-99.99% nickel at 200-300 A/m2 current-density + 2.5-3.
U.S. Nickel-cathode product internal to refinery + shipped as 99.95-99.99% Ni cathode + Ni briquette + Ni round + Ni button at 1000-2000-pound bundles for downstream stainless-steel + alloy + battery-cathode-precursor pCAM + cathode-active-material CAM + plating customer.
The eight sections below cite OSHA Hazard Communication 29 CFR 1910.1200 + 1910.1000 sulfuric-acid + acid-mist + soluble-nickel + soluble-cobalt + arsenic + lead PEL + 29 CFR 1910.1018 As + 1910.1025 Pb + 1910.1027 Cd + 1910.1450 + MSHA 30 CFR 56/57 + EPA Method 6010 + 6020 metal analytical + EPA NPDES + state-specific mining-discharge permit + EPA SPCC + state-specific nickel-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 + nickel-mist + 40 CFR 63 NESHAP Primary Nickel + EPCRA 313 TRI + IARC Group 1 carcinogen nickel + soluble-Ni + EU REACH SVHC nickel-sulfate + nickel-chloride framework at routine operating practice at North American + Latin-American + European + Australian + African + Asian nickel SX + EW + ER tankhouse operations.
1. Material Compatibility Matrix
Nickel electrolyte at typical 60-90 g/L Ni + 5-50 g/L H2SO4 sulfate-process or 60-100 g/L NaCl chloride-process + 50-80C + minor Co + Fe + Cu + Zn + Mn + Mg + boric-acid + wetting-agent matrix is a strongly corrosive acidic-or-chloride-bearing process electrolyte with acid-corrosion + chloride-stress-corrosion + galvanic-corrosion + acid-mist + nickel-mist-emission considerations on metallic construction. Lead-lined-steel + chemical-lead 99.99% Pb-Sb-6% antimony alloy + super-duplex 2507 + HC-22 + HC-276 alloy + titanium-grade-2 + grade-7 (Ti-Pd) at the tankhouse-cell at chloride-bearing service are the dominant cell-construction materials. HDPE + XLPE + FRP vinyl-ester + CPVC + 316L stainless are dominant at the process-water + acid-makedown + reagent-makedown + adjacency outside the tankhouse cell. Note operating-discipline considerations: chloride-corrosion discipline (chloride-electrolyte at 60-100 g/L NaCl drives stainless-steel pitting + crevice + stress-corrosion-cracking at sample station + analytical-lab + electrowinning-cell + tankhouse busbar; chloride-electrolyte calls super-duplex 2507 + HC-22 + HC-276 + titanium-grade-7 alloy at affected component), acid-mist + nickel-mist discipline (electrowinning-cell evolves H2SO4 acid mist + soluble-nickel 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 acid + 0.1 mg/m3 soluble-nickel; cell-house ventilation + acid-mist suppressant FOAM cover or HDPE bead-cover + acid-mist scrubber + supplied-air-respirator at sampling work is mandatory), nickel-carcinogen-PPE discipline (nickel + soluble nickel is IARC Group 1 carcinogen + skin-sensitizer Cat 1 + Reproductive Cat 1B; double-glove + respiratory-protection + medical-monitoring + biological-monitoring + decontamination at every Ni-area worker is mandatory under EU REACH SVHC + OSHA framework), and diaphragm-cell discipline (chloride-electrolyte process uses diaphragm-cell with porous asbestos-or-polypropylene diaphragm separating chloride-anolyte at lead-anode from sulfate-catholyte at stainless-cathode; diaphragm-cell pH + ion-transport management is mandatory at quality-cathode production).
| Material | Ni Electrolyte @ 50C | Ni Electrolyte @ 80C | Notes |
|---|---|---|---|
| HDPE rotomolded | A | C | Standard at process-water + acid-makedown + bath-conditioning-makedown + reagent + sample + adjacency service across the 1,500-10,000-gallon range; temperature-derated above 60C; opaque-pigmented for UV protection |
| XLPE rotomolded | A | B | Standard at higher-temperature electrolyte process-water service to 70C |
| Polypropylene (PP) | A | A | Standard at smaller acid-resistance specialty service to 90C |
| FRP vinyl-ester resin | A | A | STANDARD at larger catholyte + anolyte + receiving-tank service across the 50,000-2,000,000-gallon scale at temperatures to 90C |
| 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 sulfate-electrolyte service due to acid attack; pitting + stress-corrosion-cracking risk |
| 316L stainless steel | B | C | Acceptable at sulfate-electrolyte sample-station + analytical-lab service to 50C; NOT at chloride-electrolyte service |
| Duplex 2205 / 2507 | A | A | Premium at chloride-electrolyte sample-station + analytical-lab service |
| Super-duplex 2507 / 6Mo / HC-22 / HC-276 | A | A | Premium at chloride-electrolyte tankhouse-cell + busbar + diaphragm-cell anolyte service |
| Titanium grade 2 / 7 | A | A | Premium at chloride-electrolyte tankhouse + diaphragm-cell + analytical-lab service |
| 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 sulfate-electrolyte tankhouse-cell construction; chemical-lead 99.99% Pb-Sb 6% antimony alloy lining |
| Chemical-lead 99.99% | A | A | STANDARD at sulfate-electrolyte tankhouse-cell wall + bottom + anode |
| EPDM | A | B | Standard gasket + lining at electrolyte service to 70C |
| Viton (FKM) | A | A | Standard at higher-temperature electrolyte pump + valve seat |
| PVC Sch 80 | A | NR | Standard at piping at electrolyte service to 50C; NOT at 80C tankhouse |
| 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 + Australian + African + Asian nickel SX + EW + ER tankhouse operations is lead-lined-steel + chemical-lead 99.99% Pb-Sb 6% antimony alloy electrowinning-cell construction at sulfate-electrolyte process + super-duplex 2507 + HC-22 + HC-276 + titanium-grade-7 (Ti-Pd) clad construction at chloride-electrolyte diaphragm-cell process, FRP vinyl-ester resin or rubber-lined carbon-steel construction at the larger 50,000-2,000,000-gallon catholyte + anolyte + receiving-tank vessel, and HDPE rotomolded tank at the 1,500-10,000-gallon process-water + acid-makedown + boric-acid-makedown + sodium-chloride-makedown + wetting-agent + 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 nickel-tankhouse-adjacency specification across the standard envelope; primary tankhouse-cell + 50,000-2,000,000-gallon catholyte + anolyte vessel typically calls lead-lined-steel + super-duplex + titanium + FRP vinyl-ester construction outside our HDPE 5-brand scope; we refer those specifications to qualified lead-lined-steel + super-duplex + titanium + FRP tank fabricators.
2. Real-World Industrial Use Cases
Sulfate-Electrolyte Nickel EW Tankhouse (Dominant Use at Sulfide-Sulfate Refinery).5-3.5 V cell-voltage + 200-300 A/m2 current-density + 50-80C temperature. Catholyte at pH 2.5-4.5 + recirculated through electrowinning-cell + scavenger-cell + decopperization-cell + filter + ion-exchange + recovered to SX + autoclave feed loop. Storage envelope: lead-lined-steel + super-duplex tankhouse-cell + FRP vinyl-ester or rubber-lined-steel catholyte + receiving-tank typically OUTSIDE HDPE scope; HDPE rotomolded process-water + acid-makedown + boric-acid + reagent + sample at 1,500-10,000-gallon scale within HDPE 5-brand scope.
Chloride-Electrolyte Diaphragm-Cell Nickel Refinery (Dominant at PGM-Co Refinery). Chloride-electrolyte nickel EW diaphragm-cell process at refineries (Vale Sudbury INO + Long Harbour + Glencore Nikkelverk Norway + Sudbury INO + Eramet SLN Doniambo) electrowins nickel from chloride-electrolyte at 60-90 g/L Ni + 60-100 g/L NaCl at lead-anode chloride-anolyte + porous asbestos-or-polypropylene diaphragm + stainless-blank cathode at sulfate-catholyte at 2.5-3.5 V cell-voltage + 200-300 A/m2 current-density + 60-80C temperature. Diaphragm-cell allows separate anolyte + catholyte chemistry + anode-evolution of chlorine gas at chloride-anolyte + cathode-evolution of nickel at sulfate-catholyte. Storage envelope: super-duplex + HC-22 + HC-276 + titanium-grade-7 tankhouse-cell + FRP vinyl-ester catholyte + anolyte + receiving-tank typically OUTSIDE HDPE scope; HDPE rotomolded reagent + sample at 1,500-10,000-gallon scale.
MHP and Battery-Recycling Nickel Refining. Mixed-hydroxide-precipitate MHP from DRC + Indonesia + New Caledonia laterite + sulfide refinery + black-mass from lithium-ion battery recycling (Umicore + Li-Cycle + Redwood + Glencore Sudbury INO + Sumitomo + GEM Co Ltd + Ganzhou Tibet ShengTuo + Quzhou Huayou) is redissolved in sulfuric-acid + Cyanex + D2EHPA SX + nickel-sulfate strip-electrolyte + electrowinning to battery-grade nickel cathode + nickel-sulfate crystal NiSO4-6H2O. Storage envelope: same as primary refinery.
Carbonyl-Process and Mond-Process Nickel Refining. Carbonyl-process nickel refining (Inco Sudbury + Vale Clydach Wales + Glencore Nikkelverk Norway) volatilizes nickel as Ni(CO)4 carbonyl + decomposes to high-purity nickel pellet at 200-250C + 1 bar CO. Mond-process is an alternative high-purity refining route at smaller scale. Storage envelope: dedicated specialty CO + carbonyl handling equipment outside HDPE scope.
Process-Water and Reagent Adjacency. Sulfuric-acid + nickel-sulfate-makeup + boric-acid-makeup + sodium-chloride-makeup + wetting-agent 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. Nickel + soluble nickel OSHA PEL-TWA 1 mg/m3 + ACGIH TLV-TWA 0.05 mg/m3 + IDLH 10 mg/m3 + IARC Group 1 carcinogen nickel + soluble nickel + Skin Sensitizer Cat 1. Cobalt + soluble cobalt OSHA PEL-TWA 0.1 mg/m3 + ACGIH TLV-TWA 0.02 mg/m3 + IDLH 20 mg/m3 + IARC Group 2A carcinogen. Arsenic OSHA PEL-TWA 0.010 mg/m3. Lead OSHA PEL-TWA 0.050 mg/m3. Worker SDS + medical + biological-monitoring + double-glove + respiratory-protection + decontamination at every Ni-Co-area worker.
EU REACH SVHC Nickel and Cobalt. Nickel-sulfate NiSO4 + nickel-chloride NiCl2 + nickel-carbonate are EU REACH SVHC Carcinogen Cat 1A + Reproductive Cat 1B + Skin Sensitizer Cat 1 + STOT-RE Cat 1. Cobalt-sulfate + cobalt-chloride + cobalt-dichloride + cobalt-dinitrate + cobalt-acetate + cobalt-carbonate + cobalt-oxide are EU REACH SVHC Substances of Very High Concern (Reproductive Cat 1B + Carcinogen Cat 1B + STOT-RE Cat 1) + Authorisation List Annex XIV. Refinery worker exposure + product labeling + downstream notification + Authorisation Application framework.
MSHA 30 CFR 56/57 Surface-and-Underground Mine Standards. MSHA 30 CFR 56.5001 + 57.5001 acid-mist + nickel-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 Ni + Co + Cu + Zn + Fe + Mn + As + Sb + Bi + Pb + Cd + Cr + Hg + Se + Te + minor metal at electrolyte + spent-electrolyte + cathode + anode-slime sample collection.
EPA NPDES + State Mining Discharge Permit. Nickel-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.
Title V Clean Air Act Acid-Mist + Nickel-Mist + 40 CFR 63 NESHAP. Nickel-refinery tankhouse fugitive acid-mist + nickel-mist + heavy-metal-mist per Title V state air permit + 40 CFR 50 NAAQS + 40 CFR 60 NSPS + 40 CFR 63 NESHAP for Primary-Nickel-Smelting + Secondary-Nickel-Smelting + Nickel-Refinery framework. Acid-mist scrubber + bag-house + ESP + monitoring framework.
EPA SPCC + EPCRA TRI Reporting. Nickel-bearing electrolyte storage requires double-liner + leak-detection + secondary-containment per state-specific code; EPCRA 313 TRI threshold per 40 CFR 372 covers Ni + Co + Cu + Pb + As + Cd + Cr + Hg + Zn + Sb + sulfuric acid + chlorine releases at the SX-EW + ER tankhouse + tailings facility annual reporting framework.
Diaphragm-Cell Asbestos Discipline (Phaseout). Historical chloride-electrolyte diaphragm-cell asbestos diaphragm is being phased out under EPA TSCA + state-specific asbestos-removal program; replacement with polypropylene + PTFE + ion-exchange-membrane diaphragm is the routine modernization at most contemporary nickel chloride-electrolyte refinery.
4. Storage System Specification
Tankhouse-Cell Construction (Lead-Lined Steel + Super-Duplex + Titanium; Outside HDPE Scope). Primary electrowinning-cell + electrorefinery-cell + chloride-diaphragm-cell construction uses lead-lined-steel + chemical-lead 99.99% Pb-Sb 6% antimony alloy lining at sulfate-electrolyte cell + super-duplex 2507 + HC-22 + HC-276 + titanium-grade-7 (Ti-Pd) clad construction at chloride-electrolyte cell + 304 + 316L + 25Cr-7Ni-Mo cathode-blank + porous polypropylene + PTFE + ion-exchange-membrane diaphragm + acid-mist suppressant FOAM cover or HDPE bead-cover + acid-mist scrubber. Construction at qualified lead-lined-steel + super-duplex + titanium tank fabricator. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope; we refer those specifications to qualified specialty fabricators.
Catholyte and Anolyte Tank (Outside HDPE Scope). Primary catholyte + anolyte + 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, Boric-Acid, NaCl, Wetting-Agent, and Reagent Tank (HDPE Scope). Process-water + sulfuric-acid-makedown + boric-acid-makedown + sodium-chloride-makedown + wetting-agent-makedown + nickel-sulfate-makeup + nickel-chloride-makeup + 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 + Nickel-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 + nickel-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 nickel-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. Nickel-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 + soluble-nickel PEL, half-mask air-purifying respirator with acid-gas-cartridge + HEPA 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 + IARC Group 1 nickel carcinogen + EU REACH SVHC nickel + cobalt framework at every Ni-Co-area worker.
Nickel-Carcinogen Discipline. Nickel + soluble nickel is IARC Group 1 carcinogen + skin-sensitizer Cat 1 + Reproductive Cat 1B + STOT-RE Cat 1; double-glove + respiratory-protection + medical-monitoring + biological-monitoring + decontamination + work-area-segregation at every Ni-area worker is mandatory under EU REACH SVHC + OSHA + ACGIH framework. Annual medical-surveillance exam + urine-nickel + urine-cobalt biological-monitoring at every worker.
Acid-Mist + Nickel-Mist Discipline at Cell-House. Electrowinning + electrorefinery cell evolves H2SO4 acid mist + soluble-nickel mist at 5-25 mg/m3 above the cell. 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 + nickel-mist scrubber at the cell-house exhaust + supplied-air-respirator at sampling + cell-cleaning + cathode-stripping work is mandatory.
Chloride-Corrosion Discipline at Diaphragm-Cell Anolyte. Chloride-electrolyte at 60-100 g/L NaCl drives stainless-steel pitting + crevice + stress-corrosion-cracking; chloride-electrolyte process calls super-duplex 2507 + HC-22 + HC-276 + titanium-grade-7 alloy at affected component. Chlorine-gas evolution at chloride-anolyte requires chlorine-mist scrubber + chlorine-gas detector + emergency-evacuation plan.
Boric-Acid pH-Buffer Discipline. Sulfate-electrolyte process boric-acid at 25-50 g/L H3BO3 buffers pH at cathode-region during electrowinning + reduces hydrogen-evolution + improves cathode-quality. Routine boric-acid assay + makeup-addition at the tankhouse cycle is mandatory.
Diaphragm-Cell Operation Discipline. Chloride-electrolyte diaphragm-cell process uses porous polypropylene + PTFE + ion-exchange-membrane diaphragm separating chloride-anolyte + sulfate-catholyte at the cell-housing; routine diaphragm inspection + replacement at 1-3 year frequency + diaphragm-cell pH + ion-transport management is mandatory at quality-cathode production. Historical asbestos diaphragm is being phased out per EPA TSCA + state-specific asbestos-removal program.
Cargo-Tank Receipt of Sulfuric Acid and Bath Reagent. Sulfuric-acid bulk receipt at 5,000-25,000-gallon FRP vinyl-ester storage + boric-acid + sodium-chloride + wetting-agent receipt at 1,500-10,000-gallon HDPE makedown + nickel-sulfate + nickel-chloride makeup-salt at supersack delivery. PPE + transfer-rate-monitoring + secondary-containment + emergency-deluge framework.
QC Sampling and Verification. Each catholyte + anolyte + cathode + anode-slime sample collection: Ni + Co + Cu + Zn + Fe + Mn + As + Sb + Bi + Pb + Cd + Cr + Hg + Se + Te + Cl + acid + boric-acid + wetting-agent per EPA Method 6010 + 6020 ICP + analytical-lab additive titration + spectrophotometry, pH continuous + grab confirmation, ORP, conductivity, density, current-density + cell-voltage continuous + Hall-cell rating monthly. Battery-grade nickel-sulfate purity at 99.95-99.99% Ni + impurity to less-than-50 ppm Co + Mn + Cu + Zn + Fe specification per battery-customer pCAM + CAM specification.
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