Recovering Platinum from Spark Plug Electrodes with ALS2 Acidless Separation
Old spark plugs accumulate in remarkable volumes across Australia. Workshops in Sydney and Melbourne, mining service depots near Kalgoorlie, fleet garages around Brisbane, and rural mechanics throughout regional Queensland all generate a steady flow of used plugs as part of normal vehicle servicing. Each plug carries a small but real deposit of platinum fused into its electrodes, and that metal has traditionally been locked inside the plug until a refining house could process it.
ALS2 changes that picture. Developed by the Italian engineering firm Ikoi S.p.A. with the support of the European Union's Horizon 2020 research and innovation programme, the technology separates platinum and other precious metals from electronic waste using an acidless process. Where older refineries relied on aqua regia, cyanide leaching, and aggressive acid baths, ALS2 leans on a sequence of physical and selective chemical steps that produce far fewer hazardous by-products. For Australian operators working under tightening state and federal e-waste rules, that difference translates into lower compliance overhead and a smaller environmental footprint on the workshop floor.
Why platinum from spark plugs matters in Australia
Australia produces a great deal of mineral wealth, yet the country remains a net importer of platinum-group metals. Most of the platinum used in local manufacturing, catalytic converters, and laboratory equipment arrives from overseas refiners, which leaves domestic users exposed to currency swings, shipping delays, and fluctuating benchmark prices quoted in United States dollars. Recovering platinum from locally generated waste streams therefore offers a quiet but meaningful contribution to supply security.
Spark plugs are a particularly attractive source. Australian vehicles often stay on the road for fifteen years or more, and the heavy-duty trucks that service mining operations in the Pilbara, the Hunter Valley, and the Bowen Basin burn through plugs at a steady rate. A single plug typically holds between half a gram and one gram of platinum distributed across its centre and ground electrodes. Multiply that by the millions of plugs replaced or scrapped each year and the volume of recoverable metal becomes significant, even if each individual plug seems unremarkable.
Inside the ALS2 separation process
The ALS2 platform is built around a mechanical and selective-chemical workflow that avoids the bulk acid baths used in traditional refineries. Used spark plug electrodes are first cleaned, sized, and conditioned so that the metallic fraction can be separated from the ceramic insulator and steel shell. The conditioned material then moves through a controlled thermal stage that prepares the platinum-bearing alloy for selective extraction, followed by a wet step that uses mild, recyclable reagents rather than concentrated hydrochloric or nitric acid.
Because the system relies on sequenced modular units rather than large volumes of standing corrosive liquor, it fits comfortably into compact recovery plants. Operators in Brisbane or Perth can place an ALS2 line next to existing WEEE sorting equipment without rebuilding the surrounding facility. The modular design also simplifies maintenance, since individual stages can be serviced while the rest of the line continues to operate, lifting overall availability compared with traditional batch refining.
What makes spark plug electrodes a valuable feedstock
Spark plug electrodes are engineered to survive extreme heat, vibration, and corrosion. The platinum alloy on the electrode tips is therefore tightly bonded to a nickel-based core, which is exactly why the metal is so durable in service and so tricky to recover once the plug reaches end of life. That same bonding also means that, when the plug is finally processed, the platinum is concentrated in a small, predictable fraction of the original mass.
Feedstock quality is consistent across brands and vehicle types, which matters for operators designing a recovery line. Whether the plugs come from passenger cars in suburban Adelaide, taxis in central Sydney, or diesel generators on remote Western Australian cattle stations, the platinum-bearing fraction behaves in much the same way. Predictable inputs make it easier to plan throughput, calculate yields, and price the recovered metal on the local market in Australian dollars once it is refined to accepted bullion purity.
Environmental and safety gains for Australian operators
Acid-based refining carries well-known risks. Aqua regia fumes attack respiratory tissue, storage tanks demand bunding and ventilation, and the neutralised effluent must be treated before discharge under the Australian National Pollutant Inventory thresholds. Even a small spill in a workshop yard can trigger reporting obligations under state environment protection authorities such as the New South Wales Environment Protection Authority or Victoria's Environment Protection Authority.
ALS2 removes most of those hazards from the daily routine. Operators no longer need to store large volumes of concentrated acids, the reagent inventory is lower and easier to handle, and the effluent profile is reduced enough to simplify on-site treatment. For facilities located near residential areas in Melbourne or on constrained industrial sites in inner Brisbane, the smaller chemical footprint also makes it easier to obtain and renew operating consents. Workers benefit from a less hostile environment, which reduces the cost of personal protective equipment and the training burden placed on supervisors.
Building compact recovery plants with ALS2
The ALS2 design philosophy treats precious-metals recovery as something that can sit alongside other waste streams rather than requiring a dedicated, large-scale refinery. The core line occupies a footprint that fits into existing sheds and industrial units, and the supporting equipment for feedstock handling, gas treatment, and water recycling is sized for a single site rather than a regional hub.
That scale is well matched to the way Australia's e-waste network is developing. Collection points in Sydney, Melbourne, and Perth already sort WEEE into material categories, and a compact ALS2 module can be co-located with those operations to capture value before scrap is shipped overseas. Smaller regional centres, such as Townsville or Newcastle, can also host a line without the massive capital outlay of a traditional refinery, opening the door to distributed urban mining across the country.
Comparing ALS2 with traditional refining methods
The differences between acidless and acid-based recovery become clear when the major options are laid side by side. The summary below shows how ALS2 compares with conventional aqua regia refining and straight pyrometallurgical smelting for a typical spark plug feedstock.
| Criterion | ALS2 acidless separation | Aqua regia refining | Pyrometallurgical smelting |
|---|---|---|---|
| Primary reagents | Mild, recyclable selective chemicals | Concentrated hydrochloric and nitric acid | Fluxes, lead or copper collectors |
| Workplace hazards | Low acid inventory, moderate heat | High acid fumes, strong oxidisers | High temperatures, metal fumes |
| Effluent treatment | Reduced volume, easier neutralisation | Large volumes of acidic wastewater | Slag handling, possible heavy metal leach |
| Plant footprint | Compact, modular | Medium to large | Large, often off-site |
| Recovery rate for platinum | High, selective on PGMs | High, but losses in liquor | Moderate, depends on collector metal |
| Suitability for urban sites | Strong | Limited by acid storage | Limited by emissions and permits |
| Alignment with circular economy goals | Strong | Weakens with acid waste streams | Mixed, depends on energy source |
For Australian operators weighing capital cost against environmental performance, the comparison helps explain why acidless separation is gaining ground in regions with strict environment protection rules.
Regulatory alignment for Australian e-waste operators
Australia's regulatory landscape for e-waste and end-of-life vehicles has tightened steadily over the past decade. The federal Product Stewardship Act 2011 provides the framework for voluntary and mandatory schemes, while state-level regulations in New South Wales, Victoria, and Queensland already restrict certain categories of e-waste from landfill. The National Waste Policy Action Plan sets a national target of eighty per cent resource recovery by 2030, and product stewardship arrangements covering automotive components continue to expand.
An ALS2-based facility supports those goals in a way that is easy to document. The reduced acid inventory simplifies reporting under state environment protection policies, the smaller effluent load eases compliance with trade-waste agreements for industrial tenants, and the higher recovery rate contributes directly to national recovery targets. For operators planning to participate in the federal Product Stewardship scheme for automotive oils, filters, and related components, or for those aligning with state-based e-waste product stewardship programs, the technology offers a defensible technical foundation.
Get in touch with the ALS2Project team
If you are running an automotive service network in Australia, operating a WEEE sorting facility in Brisbane or Perth, or planning a compact precious-metals recovery line near an existing scrap hub, the ALS2Project team can help you evaluate deployment options. Technical datasheets, pilot data, and integration guidance are available on request, and the project welcomes expressions of interest from operators across Sydney, Melbourne, Adelaide, and regional centres. Contact the ALS2Project today to discuss how acidless separation can fit into your recovery roadmap.