U.S. Secondary Nonferrous Smelting, Refining and Alloying — NAICS 331492

1. Overview

North American Industry Classification System (NAICS) code 331492 covers U.S. facilities that recover nonferrous metals other than copper and aluminum from scrap, or alloy purchased metals, and produce forms such as ingot, billet, bar and wire.[1] Important streams include lead batteries, zinc-bearing steel dust, precious-metal scrap, spent industrial catalysts and specialty alloys.

This is not one commodity market. Lead recyclers depend on battery returns; zinc recovery follows steel production; precious-metal refiners compete on assay accuracy and trust. Public investors generally obtain diversified exposure through listed miners, materials companies and holding companies. Private investors can target individual plants, collection networks, toll refiners and environmental-services businesses more directly.

2. What it is and industry structure

A typical operator receives scrap, samples and assays it, removes contaminants, recovers the metal through thermal or chemical processes, refines it to specification and casts or returns the finished material. Actual feedstocks include spent lead-acid batteries; catalytic converters; jewelry, electronics and industrial precious-metal waste; steelmaking zinc dust and dross; nickel-bearing alloys and superalloy revert; tin-bearing scrap; and assorted specialty-metal residues.[2]

Plants first sample and assay incoming material, because payment depends on recoverable metal rather than gross weight. Feed is then broken, shredded, dried, sorted or otherwise prepared before thermal or chemical separation. Smelting uses furnaces, reductants such as coke, fluxes such as limestone or soda ash, and sometimes electric current; hydrometallurgical routes use leaching, solvent extraction and precipitation. Slag, baghouse dust, spent reagents and wastewater require separate treatment.[2]

The classification excludes:

• Secondary aluminum smelting, NAICS 331314.
• Copper recovery and alloying, NAICS 331420.
• Integrated recovery followed by rolling, drawing or extrusion, NAICS 331491.
• Scrap sorting and wholesaling without smelting, NAICS 423930.
• Commingled-material sorting without metal refining, NAICS 562920.[1]

Classification is establishment-based, so different plants owned by the same company may carry different codes.[1] Ownership is mixed but leans private. Lead assets are often held by family businesses, private-equity-backed groups or integrated battery manufacturers. Precious- and specialty-metal refining includes private specialists and subsidiaries of global public companies.

Classification boundaries matter. A battery manufacturer with captive recycling may be recorded under battery manufacturing, while a recycler that mainly sorts material may fall under waste management or wholesaling rather than NAICS 331492.

3. How big it is

The federal statistics report 187 employer establishments, 9,490 employees, first-quarter payroll of $185.3 million and annual payroll of $751.3 million in 2023.[3]

The supplied federal extract does not provide reportable industry revenue, value of shipments, firm count, concentration ratios or capacity utilization; none is estimated here. For commodity context—not total industry revenue—the U.S. Geological Survey valued U.S. secondary lead production at $2.4 billion in 2025. Recyclers produced approximately 1.0 million metric tons, equivalent to 70% of apparent domestic lead consumption.[5]

The lead subsegment is more concentrated than the code overall. EPA counted only 11 operating U.S. secondary-lead smelters in 2025, five fewer than at the time of its 2012 rulemaking; six companies owned 10 of the 11 facilities.[6] The identified operators include East Penn Manufacturing, Gopher Resource, Ecobat subsidiaries, Clarios, Sanders Lead and Doe Run's Buick Resource Recycling facility.[6] However, those plant-level figures should not be extrapolated to the broader NAICS code, which includes zinc, precious metals and specialty alloys with different structures.

For historical reference, the 2002 Economic Census reported 213 companies and $2.7 billion of shipments; the four and eight largest companies accounted for 23.8% and 36.3% of shipments, respectively.[7] Those figures are too old to infer present concentration.

County Business Patterns (CBP) covers establishments with paid employees, excluding nonemployers and most government activity.[4] Government and tiny operators are unlikely to dominate this capital-intensive industry, so that omission should be modest. The more important undercount is likely captive recycling housed inside establishments classified by another primary activity.

4. Investable universe

There is no large, listed U.S. pure-play secondary lead refiner. The closest public exposures are diversified:

Foreign-listed companies Johnson Matthey and Umicore provide diversified global precious-metal refining exposure with U.S. operations. Johnson Matthey reported fiscal-2025/26 revenue of £12.6 billion, but sales excluding precious metals of only £2.6 billion, illustrating how gross revenue can overstate underlying economics when it includes pass-through metal value.[14]

Major private-control assets include Ecobat's U.S. lead-recycling network; Gopher Resource, backed by Energy Capital Partners; Element Resources, owned by Atlas Holdings; family-owned East Penn Manufacturing; and Doe Run, controlled by The Renco Group.[15][16][17][18][19]

5. How the money works

Operators generally use one or more business models:

• Own-account refining: buy scrap and sell recovered metal and alloys. Returns depend on the spread between metal value and delivered feedstock cost.
• Toll refining: process customer-owned material for a treatment or recovery fee. This reduces direct commodity exposure but requires trusted assays and metal accounting.
• Closed-loop integration: collect used products, recycle their metals and reuse them in new batteries or materials.
• Byproduct recovery: earn additional value from silver, antimony, nickel, molybdenum, plastics or other recovered materials.

Major costs are scrap purchases, inbound freight, electricity and fuel, reagents, labor, furnace maintenance, environmental controls, waste disposal, insurance and working-capital financing.

Metal-price exposure is nonlinear. Higher prices raise the value of output but normally raise scrap purchase prices, supplier advances, inventories and hedging requirements. Falling prices can cause collectors to withhold material, reducing throughput precisely when unit margins are already pressured.

Sibanye's PGM recycling disclosures illustrate the cycle. During the first half of 2023, the operation advanced approximately $2 million per day to suppliers and carried approximately $178 million of recycling advances. Weak vehicle replacement, fewer scrapped vehicles, lower PGM prices and contraction among collection networks reduced feed volumes by 52% year over year; adjusted EBITDA fell 49% to $20 million, a 5% margin.[20] For full-year 2023, its average recycling basket price fell 24% to $2,334 per three-element ounce while recycling EBITDA declined 58% to $33 million.[21]

Mature zinc-recovery economics can look much better, although Befesa's reported segment is global and broader than U.S. NAICS 331492. In 2025 its Steel Dust Recycling Services segment recorded €799.7 million of revenue and €212.1 million of adjusted EBITDA, a 26.5% margin, versus 20.6% in 2024. Management attributed the improvement primarily to lower zinc treatment charges and hedging. Plants processed 1.215 million tonnes of electric-arc-furnace dust at approximately 70% utilization.[11]

Early-stage lithium-ion recycling presents the opposite profile. American Battery Technology Company reported $4.3 million of fiscal-2025 revenue, $14.9 million of cost of goods sold and a $10.6 million gross loss while commissioning and ramping its plant. It also wrote inventory down by $2.9 million to net realizable value.[12]

Government incentives can overwhelm underlying results. Sibanye recognized $126 million of cumulative Section 45X credits during the first half of 2025 while recycling EBITDA excluding those credits was only $4 million.[22] The credit for qualifying critical minerals is generally 10% of production costs, subject to technical purity, production and sale requirements.[23] Current law begins phasing the critical-mineral credit down in 2031 and terminates it after 2033, adding policy risk to long-dated project models.[24]

The most useful operating measures are throughput, capacity utilization, furnace uptime, recovery yield, payable metal, margin per ton excluding metal-price pass-through, contracted versus spot feedstock, energy use, inventory days, maintenance spending and environmental provisions.

Reported revenue can be misleading: high metal prices can inflate sales without improving profit, while customer-owned metal processed under tolling arrangements may not appear as revenue. Feedstock availability can also dominate demand; AMG reported that U.S. refinery shutdowns reduced spent-catalyst supply and hurt its recycling business in 2025.[10]

6. Demand drivers

Lead batteries. Lead-acid batteries represented 67% of apparent U.S. lead consumption in 2025.[5] Replacement vehicle batteries, industrial motive power and backup systems for telecommunications and data centers provide recurring demand. Replacement demand makes lead less dependent on new-vehicle production than a superficial auto-cycle analysis suggests. Battery Council International reports a 99% U.S. lead-battery recycling rate, though that is a trade-association estimate and should not be confused with smelter capacity utilization or profitability.[25]

Steel activity. Zinc recovery from electric-arc-furnace steel dust follows domestic steel output, automotive production and construction. Steel-sector decarbonization supports this stream because greater electric-arc-furnace production generates more zinc-bearing dust.[11]

Precious metals. Platinum-group metals and other valuable metals are recovered from catalytic converters, electronics, jewelry, industrial catalysts and process residues. USGS estimates that U.S. autocatalyst recycling recovered approximately 50,000 kilograms of palladium and 8,600 kilograms of platinum in 2025.[5] Vehicle scrappage supports current feed, although battery-electric vehicles will gradually reduce future autocatalyst supply. Johnson Matthey expected automotive use of both platinum and palladium to fall 5% in 2025 as battery-electric powertrains gained share.[26]

Nickel. Nickel recycling is driven more by stainless steel, superalloys and industrial scrap than by end-of-life EV batteries today. USGS estimates reported U.S. consumption of secondary nickel from purchased scrap at 130,000 metric tons in 2025, accounting for approximately 60% of apparent consumption.[5]

Lithium-ion batteries. DOE reported that U.S. facilities in 2023 could reclaim 35,500 tons of battery materials, with another 76,000 tons of announced capacity.[27] DOE has awarded $1.82 billion to 14 battery-material, manufacturing and recycling projects under a broader $3 billion grant program.[28] The investment thesis depends on delayed flows of retired EV batteries, nearer-term manufacturing scrap, chemistry mix and the ability to refine black mass into saleable battery-grade material. Low-cobalt and low-nickel chemistries reduce contained commodity value even while physical battery volume grows.

Refinery operations. Spent petroleum catalysts supply vanadium, nickel and molybdenum recyclers. Refinery closures, maintenance schedules and changes in catalyst technology can constrain feed.

Supply security. Lead joined the federal critical-minerals list in 2025, alongside several metals handled by this industry.[29] Domestic-processing policy can support established assets, but incentives do not cure poor feedstock economics or difficult permitting.

Cyclicality varies by stream: replacement batteries are relatively defensive; steel dust, refinery catalysts, electronics scrap and industrial precious metals are more sensitive to production cycles.

7. Regulation

Secondary lead is among the most tightly regulated segments. The U.S. Environmental Protection Agency (EPA) regulates process and fugitive emissions under the Clean Air Act's National Emission Standards for Hazardous Air Pollutants (NESHAP). EPA's 2025 proposed amendments covered 11 secondary lead facilities and remained proposed rather than final as of its 2026 update.[30]

EPA estimated in its 2025 secondary-lead review that installing wet electrostatic precipitators at the eight facilities then lacking them would require $621 million upfront and $73 million annually for approximately 3.8 tons per year of additional lead-emission reduction. EPA did not propose the requirement after calculating a cost of approximately $19 million per ton, but subsequent rulemaking or litigation could revisit the issue.[6]

Other important requirements include:

• EPA New Source Performance Standards for new, reconstructed or modified secondary lead equipment.[30]
• Resource Conservation and Recovery Act (RCRA) rules for hazardous residuals, precious-metal reclamation and spent lead-acid batteries.[31]
• Occupational Safety and Health Administration rules governing workplace lead exposure, respiratory protection and medical surveillance. OSHA says secondary-lead-smelter workers experience some of the highest occupational lead exposures among lead-related industries. The federal permissible exposure limit is 50 micrograms per cubic meter over an eight-hour shift; the 30-microgram action level triggers measures including exposure monitoring and blood-lead testing.[32]
• State air, wastewater, stormwater, hazardous-waste and land-use permits.
• Transportation rules for hazardous batteries and legacy-site cleanup obligations.

A strong permit can be a competitive asset. It is also a continuing liability: emissions failures, worker exposure or historical contamination can generate shutdowns, remediation costs and tighter operating limits.

8. Competitive dynamics and consolidation

The main barriers are environmental permits, hazardous-material logistics, furnace expertise, assay credibility, customer qualification and dependable scrap collection. A functioning brownfield plant with secure feed can be worth more than a larger but unpermitted project.

Lead favors vertical integration because battery manufacturers and distributors can control core-return networks and reuse recovered lead. Independent refiners must compete on collection reach, purchase terms, yield and reliability.

Precious-metal refining has a different moat. Customers entrust processors with valuable, heterogeneous material, making sampling, security, settlement speed and assay integrity central to retention.

Consolidation is constrained by legacy environmental liabilities but remains active. Sibanye-Stillwater expanded into U.S. precious-metal recycling through Reldan and Metallix, while private sponsors assembled Gopher Resource and Element Resources.[9][16][17] The broader industry's official concentration ratio is unavailable, so it should not be inferred from the visibly concentrated secondary-lead subgroup.

9. Risks

• Environmental liability: Air emissions can include lead, cadmium, arsenic, mercury, other metal hazardous-air pollutants, hydrocarbons, acid gases and dioxins. Wastewater regulation covers residues from furnaces and filtration, wet scrubbers, rinsing and cooling.[2] Permitting delays, community opposition, legacy contamination, remediation obligations and changes in control standards can destroy otherwise attractive project returns.
• Feedstock scarcity: exports, captive return networks and competing refiners can leave plants underutilized. Scrap grade is variable, fraud and assay disputes occur, and falling prices may cause collectors to retain inventories.
• Metal-price and working-capital risk: price swings change scrap economics, inventory values and financing requirements.
• Operational risk: furnace, refractory or pollution-control failures can halt production at high-fixed-cost assets. Heat, molten metal, fires, explosions and combustible lithium-ion batteries add further recruitment, training, insurance and downtime costs.
• Assay risk: small sampling or recovery errors can be material in precious metals.
• Customer concentration: toll refiners may depend on a few large feedstock suppliers or offtakers.
• Technology substitution: changing battery chemistries may reduce some lead uses, while vehicle electrification reduces long-term catalytic-converter scrap. Lithium-iron-phosphate batteries reduce nickel and cobalt recovery value.
• Project risk: new critical-mineral plants face permitting, construction, financing and ramp-up uncertainty.
• Policy risk: Section 45X credits begin phasing down in 2031 and terminate after 2033, adding uncertainty to long-dated project models.[24]
• Public-market dilution: listed companies usually combine U.S. recycling with mining, overseas operations or downstream manufacturing.

10. How to invest and outlook

Public investors should first choose the desired metal exposure, then examine segment throughput, utilization, recovery yields, treatment fees, hedging, working capital and environmental provisions. Consolidated revenue and commodity prices alone are weak guides to recycling profitability.

Private investors should prioritize permits, environmental history, feedstock contracts, collection density, customer settlement records, realistic sustaining capital and downside-tested metal spreads. Environmental diligence should cover both current compliance and inherited contamination. The absence of a defensible current industry multiple means transactions must be valued plant by plant.

The most persistent misreporting is to label every scrap handler or "urban miner" as a secondary smelter. Another error is aggregating copper and aluminum recycling into this code. "Secondary" describes the source of the metal, not inferior product quality: the output can be specification-grade metal in the same primary forms sold by ore-based refiners.

Forward-looking judgment: the outlook is cautiously constructive. The United States had no primary refined-lead production in 2025, and recycling supplied most apparent consumption; permitted domestic assets therefore have strategic value.[5] However, future returns are more likely to come from secure feedstock, reliable operations and disciplined metal-risk management than from simple commodity-price exposure. Existing permitted plants appear better positioned than speculative greenfield capacity.

Sources

1. U.S. Census Bureau, "North American Industry Classification System United States, 2022," 2022.
2. U.S. Environmental Protection Agency, "Nonferrous Metals Manufacturing Effluent Guidelines," accessed 2026.
3. U.S. Census Bureau, "County Business Patterns: 2023," 2025.
4. U.S. Census Bureau, "County Business Patterns Methodology," 2025.
5. U.S. Geological Survey, "Mineral Commodity Summaries 2026: Lead," 2026.
6. U.S. Environmental Protection Agency, "Secondary Lead Smelting NESHAP Proposed Rule," Federal Register, 2025.
7. U.S. Census Bureau, "2002 Economic Census: Concentration Ratios in Manufacturing," 2005.
8. Brookfield Business Corporation, "Fourth-Quarter 2025 Letter to Shareholders," 2026.
9. Sibanye-Stillwater Limited, "Form 20-F for 2025," 2026.
10. AMG Critical Materials N.V., "Annual Report 2025," 2026.
11. Befesa S.A., "Annual Report 2025," 2026.
12. American Battery Technology Company, "Form 10-K for Fiscal 2025," 2025.
13. United States Antimony Corporation, "Form 10-K for 2025," 2026.
14. Johnson Matthey, "Annual Report 2025/26," 2026.
15. Ecobat, "Our Locations," accessed 2026.
16. Gopher Resource, "Gopher Resource Announces Capital Raise to Refinance Existing Debt," 2024.
17. Atlas Holdings, "Atlas Establishes Stryten Manufacturing and Element Resources," 2020.
18. East Penn Manufacturing, "Sustainability in Design and Manufacturing," accessed 2026.
19. The Doe Run Company, "Sustainability Report 2022," 2023.
20. Sibanye-Stillwater Limited, "Form 6-K, First Half 2023," 2023.
21. Sibanye-Stillwater Limited, "Form 6-K, Second Half 2023," 2024.
22. Sibanye-Stillwater Limited, "Form 6-K, First Half 2025," 2025.
23. Internal Revenue Service, "Section 45X Final Regulations," 2024.
24. Congressional Research Service, "Section 45X Advanced Manufacturing Production Credit," 2025.
25. Battery Council International, "Sources," accessed 2026.
26. Johnson Matthey, "PGM Market Report 2025," 2025.
27. U.S. Department of Energy, "FOTW #1350: 2023 U.S. Battery Recycling Facilities," 2024.
28. U.S. Department of Energy, "Battery Manufacturing and Recycling Grants," accessed 2026.
29. U.S. Geological Survey, "Interior Department Releases Final 2025 List of Critical Minerals," 2025.
30. U.S. Environmental Protection Agency, "Secondary Lead Smelting: National Emission Standards for Hazardous Air Pollutants," updated 2026.
31. U.S. Environmental Protection Agency, "Regulatory Exclusions and Alternative Standards for the Recycling of Materials, Solid Wastes and Hazardous Wastes," accessed 2026.
32. Occupational Safety and Health Administration, "Lead," accessed 2026.