How ALS2 Separates Nickel-Iron Alloys from Precious Metals in Scrap
Electronic scrap rarely arrives as a neat stream of gold, silver or palladium. Printed circuit boards, connectors, relays and industrial components contain steel, copper, nickel, iron, plastics and ceramics alongside valuable metals. This mixed composition makes separation the central challenge in precious-metals recovery, especially when nickel-iron alloys are present in the same feed.
ALS2, developed by Ikoi S.p.A., approaches this challenge through acidless separation technology. Its purpose is to recover precious metals from electronic waste and WEEE while reducing dependence on aggressive acid chemistry, simplifying plant operation and supporting a cleaner recycling route. For Australian recyclers, the approach is relevant to both urban e-waste volumes and the country’s established expertise in metals processing.
| Material in the feed | Typical role in scrap | Separation objective |
|---|---|---|
| Nickel-iron alloys | Frames, pins, shielding, contacts and component parts | Remove ferrous material before precious-metal concentration |
| Copper and copper alloys | Conductors, tracks and terminals | Separate base metals from high-value fractions |
| Gold, silver and palladium | Plating, bonding wires and contact surfaces | Concentrate for final recovery |
| Plastics and ceramics | Housings, insulation and substrates | Reject or isolate non-metallic material |
| Fine composite particles | Shredded and liberated e-waste fragments | Control size, dust and particle carryover |
Why Nickel-Iron Alloys Need Careful Handling
Nickel-iron alloys are common in electrical and electronic equipment because they provide strength, conductivity, corrosion resistance or magnetic performance. They may appear in connector hardware, shielding, relay components, frames and specialist alloys. During dismantling and shredding, these parts can remain relatively coarse, break into fines or stay attached to precious-metal-bearing substrates.
Their presence creates two risks. First, nickel and iron can dilute the valuable fraction, increasing the mass that must be processed in later stages. Second, alloy particles can physically trap or carry small precious-metal fragments, causing losses when the material is screened, sorted or rejected too early.
A useful separation strategy therefore aims to liberate the alloy from the electronic component without scattering valuable coatings and particles into unsuitable streams. The exact sequence depends on feed composition, particle size and the degree of liberation achieved during preparation.
Feed Preparation Sets the Separation Quality
ALS2 begins with controlled preparation rather than treating all incoming e-waste as a uniform material. Items may be inspected, depolluted and dismantled before size reduction. Batteries, mercury-containing parts, lamps and other hazardous components require separate handling under applicable Australian requirements before the precious-metals feed enters the recovery line.
Size reduction is important because nickel-iron alloy pieces can remain attached to copper, solder or plated surfaces. A staged approach can expose these interfaces while avoiding excessive grinding. Over-grinding may generate dust, smear metals across particle surfaces or create very fine mixed particles that are harder to separate efficiently.
For an Australian operator receiving material from a council transfer station in Melbourne, a commercial dismantler in Sydney or a regional collection network in Queensland, feed variability is a practical issue. Productive plants need sampling, inspection and adjustable preparation settings rather than a single fixed recipe.
Physical Separation Removes Much of the Ferrous Load
Nickel-iron alloys often respond differently from precious metals during physical separation. Their magnetic behaviour, density, shape and particle size can be used to remove a large proportion of the ferrous fraction before targeted recovery. Magnetic separation is especially useful where the alloy remains sufficiently liberated and exhibits a strong magnetic response.
The result is a cleaner non-ferrous stream with less iron and nickel entering subsequent concentration stages. This improves process control and reduces the amount of unwanted material associated with the precious-metal-bearing fraction. However, magnetic sorting is not a complete answer: some nickel alloys have weaker responses, while fine particles may adhere to other materials or pass through with non-ferrous fragments.
ALS2 uses separation as a process sequence rather than relying on one sorting action. Screening, controlled classification and other physical steps can support the removal of alloy particles while retaining precious-metal-bearing material. Monitoring the composition of both accepted and rejected streams helps identify whether gold-plated fragments or palladium-bearing fines are being lost with the nickel-iron output.
Acidless Processing Protects Selectivity and Safety
Conventional precious-metal refining often uses strong acids or mixtures of acids to dissolve selected metals. These systems can be effective, but they may require corrosion-resistant equipment, chemical storage, ventilation, emissions management and treatment of liquid residues. They can also dissolve substantial quantities of base metal before the valuable metals are isolated.
ALS2 is designed around an acidless route. Instead of depending on aggressive acid dissolution to distinguish precious metals from nickel and iron, the technology prioritises controlled physical and process separation. Removing much of the alloy fraction before final concentration reduces the chemical burden and helps the plant focus on the material with the highest recovery value.
Acidless does not mean risk-free or chemical-free in every possible plant configuration. Dust, noise, heat, moving equipment and contaminated components still require engineering controls and trained operators. The key difference is the reduction of acid-related hazards and liquid effluent management, which can make compact precious-metals recovery plants easier to integrate into industrial recycling sites.
Keeping Precious Metals in the Correct Stream
The most valuable particles in e-waste are often extremely small or distributed as thin coatings. Gold may be present on connector edges and contact surfaces, while silver and palladium can occur in selected components, switches and ceramic or electronic assemblies. A separation system must remove nickel and iron without treating every dark or dense particle as waste.
Liberation analysis supports this balance. Operators examine particle size, alloy attachment and the composition of concentrate and reject streams. If nickel-iron pieces remain bonded to plated components, the preparation stage may need adjustment. If precious-metal fines are reporting to the ferrous fraction, the plant may need finer classification, a different separation intensity or an additional recovery pass.
This approach is particularly important for Australian feedstocks, where material can range from obsolete telecommunications equipment in Brisbane to high-grade industrial electronics from Perth’s mining and infrastructure sectors. A plant configured for one stream may perform differently when presented with mixed household WEEE or imported manufacturing scrap.
Compact Plants Suit Distributed Australian Recycling
Australia’s large distances influence recycling economics. Transporting low-value, mixed e-waste from regional areas to a distant refinery can add cost, handling and emissions. A compact recovery plant can allow valuable fractions to be concentrated closer to collection, dismantling or industrial processing activities before they move to a specialist refiner.
The model can complement the National Television and Computer Recycling Scheme, council collection programs and commercial take-back services. Material gathered through transfer stations around Adelaide or Canberra may be prepared and sorted locally, while higher-grade concentrates can move through established metal-processing networks.
Local deployment also requires attention to logistics and regulation. Operators need suitable premises, reliable power, dust control, fire prevention, trained staff and documented chain-of-custody procedures. Australia’s mining and metallurgical workforce offers relevant technical experience, but e-waste facilities still need processes tailored to mixed electronics rather than bulk ore.
Measuring Environmental and Commercial Performance
Nickel-iron alloy separation has a direct effect on resource efficiency. Recovering the alloy into a separate stream can enable further metal recycling, while concentrating precious metals reduces the mass sent to downstream treatment. The value comes from the combined outcome: higher-grade recovery, lower disposal volumes and better use of equipment capacity.
Environmental performance should be assessed across the full operation. Useful measures include precious-metal recovery rates, ferrous rejection quality, electricity consumption, dust emissions, water use, residual waste and the fate of separated nickel-iron material. These metrics help distinguish genuine resource recovery from simple movement of contamination between output streams.
For customers and regulators, transparent results are increasingly important. A recycler servicing New South Wales or Victoria may need to demonstrate responsible handling to councils, manufacturers and corporate clients. The ALS2 project’s support through the European Union’s Horizon 2020 research and innovation programme reflects the wider effort to develop recycling technologies with improved sustainability and industrial practicality.
Building a Reliable Route from Scrap to Concentrate
A successful nickel-iron separation line depends on more than equipment selection. Incoming material must be characterised, hazardous parts removed and operating conditions adjusted to the feed. Staff need to understand how alloy shape, magnetic response, plating thickness and particle size affect the destination of each fraction.
Quality control should include regular sampling of ferrous rejects, non-ferrous outputs and precious-metal concentrates. Tracking these streams provides early warning when valuable particles are being lost or when too much nickel and iron is passing into the recovery stage. It also supports commercial contracts based on measured quality rather than assumptions about the original equipment.
For Australian recyclers, ALS2 offers a pathway toward localised, acidless precious-metals recovery that can sit between dismantling and final refining. By separating nickel-iron alloys early and concentrating the valuable fraction with controlled processing, the technology helps turn complex electronic scrap into more manageable, higher-value material streams.
Explore the ALS2 approach to acidless separation and discover how Ikoi S.p.A.’s technology can support safer, cleaner precious-metals recovery from electronic waste and WEEE.