Spent automotive catalysts concentrate platinum, palladium and rhodium into a small high-value object. That creates a recovery facility where legal provenance, representative sampling and precious-metal accounting are just as important as cutting, milling and chemical extraction. Once a converter is de-canned and milled, its physical identity disappears, so the facility must establish trust before it destroys recognisability.
Canonical owner boundary. This article begins after a catalytic converter has been lawfully removed from a vehicle. TPW-0276 remains the end-of-life vehicle dismantling owner. This hub owns secure receiving, provenance, de-canning, lot formation, assay, PGM recovery/refining, acids and water, product release, security, residuals and closure.
1. Verify lawful provenance before processing
Supplier identity, ownership records and required legal evidence should close before de-canning. Suspicious material belongs in secure quarantine, not a blending hopper.
2. Preserve converter identity until receiving closes
Serials, markings, photos and source records can be lost permanently once a shell is cut. Verification must occur first.
3. De-can under captured dust conditions
Ceramic fines can carry valuable PGMs. Local extraction protects both workers and product mass balance.
4. Separate steel shell from PGM-bearing substrate
Ferrous recovery should have its own mass balance and should not be used to inflate precious-metal recovery performance.
5. Create representative lots before assay
PGMs are not distributed evenly enough for casual grab samples. Milling, homogenisation and statistically defensible sampling are core infrastructure.
6. Retain umpire samples
Buyer and seller assays can differ. Secure retained samples preserve a route for independent dispute resolution.
7. Track platinum, palladium and rhodium separately
A combined PGM number can hide poor rhodium performance or a changing feed mix.
8. Choose smelting and hydrometallurgy as distinct facility classes
High-temperature and wet-chemical routes create different air, energy, acid, slag and wastewater systems.
9. Capture every PGM-bearing dust stream
Floor dust, filter fines and sample-preparation residues are both economic loss and environmental liability.
10. Manage acids and solvents by compatibility
Hydrometallurgy can use aggressive chloride and oxidising chemistry. Tank farms, bunds and emergency routes should match actual reagents.
11. Recover PGMs before neutralisation
Poor sequence can trap precious metals in mixed wastewater sludge and make both accounting and disposal harder.
12. Assay wastewater solids before disposal
Sludge and spent media can retain significant PGM value and should remain traceable until their route is justified.
13. Release product to a named purity
Refined metal, salts and intermediate concentrates are different products and should not be described interchangeably.
14. Protect high-value product storage
Small containers can hold very high value. Access control, dual custody and dispatch procedures are part of site planning.
15. Cap inventory by safety, security and assay capacity
Rising metal prices should not turn the plant into a speculative warehouse. Maximum stock must follow approved security and fire controls.
16. Keep enforcement policy outside this owner
The hub complies with provenance and reporting requirements but does not become the owner of vehicle-theft or registration policy.
17. Plan firewater containment
A fire involving dust collectors, solvents or reagents can mobilise PGMs and chemicals into runoff. Emergency drainage must retain it.
18. Close the lot-by-lot mass balance
Incoming assay, product, recycle, solution inventory, dust and residue should reconcile closely enough to reveal abnormal loss.
19. Plan closure around disputed lots and chemical inventory first
Customer-owned material, acid solutions, loaded resins and dusty filters are harder closure inventory than clean refined metal.
The deepest test
The facility succeeds when value, legality and mass remain traceable after the converter itself disappears.
Sources and further reading
- Lifezone Metals — 2026 PGM pilot production from spent autocatalysts.
- ENEA — CHemPGM secondary-source PGM recovery programme.
- Current research on decentralized automotive-catalyst PGM recovery.
- APA, UN-Habitat, World Bank and OECD circular-economy planning resources.
Continue the series: Town Planning Series Index · Advanced Town Planning Reading Routes — TPW-0196–0363