Using ALS2 to recover palladium from hybrid circuit substrates
Hybrid-integrated circuit substrates are small, complex components that can contain palladium alongside gold, silver, copper, nickel and other recoverable materials. Their value is easy to overlook because the precious-metal content is distributed through ceramics, resins, plated contacts and fine conductive layers rather than concentrated in a single visible part.
For Australian recyclers, these substrates represent a specialist stream within electronic waste and WEEE processing. They may arrive through telecommunications equipment, industrial controls, medical devices, automotive electronics and older computing hardware. Recovery requires careful sorting and a process that can handle mixed feedstock without creating unnecessary environmental or workplace hazards.
ALS2, developed by Ikoi S.p.A., is based on acidless separation technology for recovering precious metals from electronic waste. Its relevance to hybrid circuit substrates lies in the possibility of combining controlled preparation with a cleaner separation route, allowing palladium-bearing fractions to be treated in a compact recovery plant.
The technology should be considered as part of a complete recycling chain rather than a single machine that solves every feedstock problem. Good results depend on identification, dismantling, liberation, process control, residue management and accurate assay. When these stages work together, palladium recovery can become a practical addition to Australia’s circular-economy infrastructure.
Why palladium in hybrid substrates matters
Palladium is used in electronic components because it provides useful electrical, thermal and corrosion-resistant properties. In hybrid-integrated circuit substrates, it may occur in plated surfaces, conductive pastes, connector finishes or multilayer ceramic elements. The quantity in each item can be small, yet a consistent industrial feed can make recovery commercially meaningful.
The challenge is material complexity. A substrate can combine ceramic bodies, epoxy or polymer compounds, copper tracks, nickel barriers and precious-metal coatings. Mechanical treatment must expose the valuable fraction without turning the entire feed into a difficult-to-classify dust. Excessive shredding can reduce particle size, increase handling risks and make downstream separation less selective.
Palladium recovery also supports supply diversification. Australia has strong mining and refining capabilities, but urban stocks in discarded electronics are becoming increasingly relevant. Recovering metals from end-of-life equipment reduces pressure on primary extraction and keeps valuable elements in productive use for longer.
Preparing hybrid-integrated circuit feedstock
The process begins with a clear feed specification. Whole devices should be inspected and dismantled so that batteries, displays, cables, large aluminium parts, plastics and hazardous components are removed before the precious-metal-bearing substrate fraction reaches the treatment line. This improves safety and prevents low-value material from diluting the concentrate.
Sorting can be manual, sensor-assisted or supported by purchasing specifications from suppliers. Assemblies from telecommunications, industrial automation and defence-related equipment may differ significantly from consumer electronics. Keeping batches separated by product family can improve assay accuracy and help operators establish reliable palladium yields over time.
Size reduction should be controlled rather than aggressive. The objective is to liberate coated particles and expose relevant surfaces while limiting dust formation and cross-contamination. Enclosed equipment, extraction systems and appropriate personal protective equipment are important because electronic assemblies may contain fine particulates, brominated materials, lead-bearing components or other substances requiring controlled handling.
Australia’s collection geography adds a logistical consideration. Material aggregated in Sydney, Melbourne, Brisbane or Perth may travel long distances before processing, while regional loads can be less consistent. A pre-sorting model close to collection points can reduce freight of low-value material and send a denser, better-characterised fraction to a compact ALS2 installation.
How acidless separation supports palladium recovery
ALS2 is intended to provide an alternative to conventional acid-based precious-metal refining. In broad terms, acidless separation uses controlled process stages to separate valuable metals from prepared electronic feed without relying on the conventional sequence of strong mineral-acid dissolution and associated neutralisation. The exact operating configuration depends on the feed, target metals and required product quality.
For hybrid substrates, the key benefit is process selectivity combined with a potentially simpler environmental profile. Palladium-bearing particles can be concentrated after dismantling and size classification, then directed through the relevant ALS2 stages. Copper, nickel, ceramic and polymer components still need to be managed, but they do not necessarily have to follow the same recovery route as the precious-metal fraction.
“Acidless” should not be interpreted as meaning that the plant has no process controls, consumables or residues. Operators still need documented inputs, ventilation, filtration, wastewater prevention, spill response and residue classification. The advantage is the opportunity to avoid the hazards and infrastructure burden associated with large volumes of aggressive acids.
The project’s research background is part of the wider European effort to improve resource efficiency in electronic-waste treatment. Information about related European innovation activity is available through the European research network, which helps place acidless separation within a broader conversation about cleaner recovery technologies.
| Recovery route | Fit for hybrid substrates | Main strengths | Key considerations |
|---|---|---|---|
| Manual sorting and resale | High for identifiable reusable modules | Preserves equipment value and avoids processing | Requires testing, traceability and a resale market |
| Mechanical concentration | Useful as a preparation stage | Separates size and material classes at scale | Can create dust and mixed fines if poorly controlled |
| Conventional acid refining | Technically established for some concentrates | Can achieve high metal dissolution | Requires corrosive-chemical controls, effluent management and specialised facilities |
| ALS2 acidless separation | Suited to prepared precious-metal fractions | Designed to reduce dependence on acid-based refining | Requires feed characterisation, process tuning and trained operators |
| Export to an external refiner | Practical for irregular volumes | Avoids local plant investment | Adds freight, compliance, minimum-volume and chain-of-custody requirements |
Comparing recovery routes for Australian recyclers
The right route depends on feed volume, metal grade, labour costs, licensing, transport distance and the value of recovered products. A small operator receiving occasional hybrid assemblies may achieve better economics by aggregating material for a specialist refiner. A larger dismantler with a steady supply can investigate on-site concentration and compact recovery.
ALS2 becomes more attractive when the business wants greater control over its material stream. Local treatment can shorten the chain between collection and recovery, provide faster feedback on feed quality and reduce dependence on overseas processing. It may also support a clearer sustainability claim when input weights, recovered palladium and residual outputs are measured consistently.
Australian operators should also account for the difference between state and territory requirements. Environmental approvals, waste transport rules and workplace controls can vary between New South Wales, Victoria, Queensland, Western Australia and other jurisdictions. The federal Recycling and Waste Reduction Act 2020 and the National Television and Computer Recycling Scheme form part of the national context, although a specific hybrid-substrate stream may sit outside the scheme’s direct scope.
Designing a compact recovery plant
A compact ALS2 plant should be designed around the real feed rather than an assumed laboratory sample. A practical layout may include receiving and quarantine, manual dismantling, depollution, size reduction, classification, precious-metal separation, product collection and residue storage. Each stage needs defined material flows so that palladium-bearing fines do not become mixed with general scrap.
Sampling is especially important. Palladium can be unevenly distributed across batches, and a handful of visually attractive boards may not represent a full shipment. Composite sampling, duplicate assays and documented weighing help establish an accurate balance between input material, recovered product and residual fractions.
Site conditions also influence plant operation. Australian facilities may face high summer temperatures, dust, bushfire planning requirements or limited water availability, particularly outside the major metropolitan corridors. A process that minimises liquid effluent can simplify site design, but it does not remove the need for fire protection, ventilation, dust control and emergency procedures.
Water and energy consumption should be assessed alongside metal yield. A lower-grade feed may appear attractive because it is plentiful, yet the cost of transport and preparation can outweigh its recoverable value. Concentrating high-grade hybrid substrates before treatment generally gives operators a clearer route to stable performance.
Measuring compliance and circular value
A responsible palladium-recovery programme needs traceability from supplier to final product. Records should identify the source of each batch, the dismantling method, weights before and after processing, assay results, recovered metal quantities and the destination of residues. This information supports commercial settlement and helps demonstrate that material has been managed through an authorised recycling pathway.
Work health and safety controls should cover heavy-metal exposure, dust, noise, moving machinery, manual handling and any proprietary process inputs. Staff training must match the actual plant, with clear procedures for shutdowns, spills, abnormal material and equipment maintenance. Contractors who collect or transport electronic waste should receive compatible instructions.
Product quality is another consideration. Recovered palladium may require refining or further upgrading before it reaches a market specification. An operator should agree in advance whether the output will be sold as a concentrate, intermediate product or refined metal, and how assay differences will affect payment. Transparent specifications reduce disputes and make the business case easier to evaluate.
Sustainability reporting can include avoided disposal, recovered metal mass, reduced acid use, energy consumption, transport distance and the proportion of feed diverted from landfill or export. These measures are more credible when supported by weighbridge data, batch records and independent testing rather than broad claims about green recycling.
For Australian e-waste businesses, ALS2 offers a pathway to investigate local palladium recovery without automatically adopting the infrastructure associated with acid refining. The strongest projects will combine disciplined feed preparation, sound engineering, regulatory review and realistic commercial modelling. Ikoi’s technology can then be assessed against the specific composition and volume of hybrid-integrated circuit substrates available to the operator.
Build the business case around representative samples, verified assays and a complete material-flow plan. Engage qualified environmental, safety and process specialists before commissioning, and use pilot results to set recovery targets for palladium and associated metals. With that foundation, ALS2 can help turn difficult electronic assemblies into a more controlled source of secondary precious metals for Australia’s recycling market.