ALS2 for Ruthenium Recovery from Hard Disk Recording Layers

Hard disk drives are often treated as retired electronics, but their magnetic recording layers can contain ruthenium, a platinum-group metal valued for magnetic and protective properties. The drive becomes a trace-bearing waste stream with potential economic value. Ruthenium recovery from hard disk recording layers therefore depends on precise dismantling, selective layer separation and a refining route that can handle a complex mix of metals.

ALS2Project, built around Ikoi S.p.A.’s acidless separation approach, aims to make that recovery more compact and environmentally responsible than conventional acid-based refining. Backed by the European Union’s Horizon 2020 research and innovation programme, the project connects waste electrical and electronic equipment (WEEE) streams with practical plant design. For Australia, the opportunity is to recover a scarce metal while creating a traceable domestic recovery loop from specialist feedstock.

Why Hard Disk Drives Matter for Precious-Metal Recovery

Hard disk drives, or HDDs, differ from most electronic waste because the desired resource is concentrated in a thin part of the platter stack. The recording stack can include protective carbon, magnetic media and ruthenium-bearing under-layers. Once a drive reaches a recovery facility, the first challenge is opening the enclosure and separating those layers without mixing them with copper, aluminium, steel or circuit-board materials.

Concentration matters because dilution can erase the economic case for further treatment. The ruthenium-bearing fraction may be a small share of the original drive, yet it can carry disproportionate value, making this a concentrated form of urban mining. A plant handling mixed electronic scrap must identify this fraction, remove contaminants and create a consistent feed. Otherwise, sophisticated separation equipment is processing material for which no viable recovery route exists.

Retired enterprise storage also arrives in mixed condition: working drives, damaged units, stripped units and encrypted hardware may all be present. Each category needs different handling. Data-bearing devices may require verified sanitisation and chain-of-custody controls before dismantling, while opened units can move towards layer recovery more directly. Feedstock management is therefore part of the technology, not paperwork added later.

The Ruthenium Challenge Inside Recording Layers

Ruthenium combines high industrial value with specialist supply, but its presence does not make an entire HDD a ruthenium product. The metal is associated with a specific coating, and drive designs can vary in layer construction and thickness. Process developers must characterise the actual waste stream rather than assume every platter follows one recipe. Representative testing and metallurgical discipline begin here.

Mechanical pre-treatment can expose the recording stack, but crushing the drive destroys the distinction between valuable and ordinary fractions. Classification and controlled handling are needed to retain the ruthenium-bearing material. The aim is a concentrated intermediate with the best possible metal content and minimum residual electronics, ready for acidless separation, further refinement or transfer to a qualified precious-metals refiner.

Contaminants complicate every stage. Residual carbon, nickel, cobalt, iron, copper and organic cleaning materials may behave differently during treatment, while fine particles can affect separation efficiency. Fumes, dust and combustible residues also demand occupational controls. A credible route must report both recovery and loss: the percentage captured and the amount remaining in rejects are equally important.

How Acidless Separation Fits the Recovery Route

ALS2’s relevance is the separation step. By avoiding conventional acid leaching, the technology seeks to reduce reagent handling, corrosive effluent and neutralisation demand while recovering target metals from complex waste. Its commercial objective is not a chemistry-free plant, but a selective, compact route near the point where high-value electronic scrap is dismantled. More detail appears in the ALS2 project overview.

For a ruthenium application, an acidless flow sheet could accept a characterised platter-derived concentrate, separate ruthenium-bearing particles from the balance, and deliver a concentrated product for final metal recovery. The configuration must be demonstrated on real feed, including coating and contamination variations. The key questions are selectivity, recovery, product purity and residue fate, not whether one route suits every stream.

The approach also fits demand for small, modular facilities near collection and WEEE hubs. A compact plant can process batches without the scale of a traditional refinery, improving logistics for low-volume urban material and making pre-treatment easier to monitor. Modular does not mean impact-free: energy demand, maintenance, residues and certified disposal still belong in the environmental case.

Criterion	Acid-based refining	ALS2 acidless route
Process	Strong-acid dissolution followed by purification	Selective separation without conventional acid leaching
Main burden	Corrosive reagents, acid-resistant equipment and neutralisation	Feed control, mechanical preparation and residue management
Waste	Liquid effluent and salts requiring treatment	Potential to reduce liquid chemical waste; solid residues still need classification
Footprint	Usually suited to larger centralised refining	Designed for compact precious-metals recovery plants
HDD fit	Effective after suitable feed preparation	Potential for segregated platter-derived concentrates
Proof needed	Mature chemistry, but safe effluent control	Recovery, selectivity, product purity and full residue treatment on representative feed

Building Compact Plants Around Concentrated Feedstock

Moving from laboratory chemistry to a plant requires a disciplined sequence. Sampling and analysis come first, followed by mechanical liberation, separation trials and mass-balance work. Each stage should produce data on grade, yield, energy use and waste. For HDD material, operators must establish whether ruthenium concentrates in one useful fraction or remains distributed across several outputs, because that evidence determines equipment sizing.

Plant design should separate high-value operations from bulk handling. Drives can be opened and de-capped near controlled pre-treatment, with only selected material travelling to precious-metals separation. Segregation limits cross-contamination and protects fragile separation performance from general WEEE. It also lets councils use conventional recycling for the bulk while a specialist handles the metal-bearing fraction.

Australians can learn from the compact-plant model without copying it unchanged. Local waste volume, transport routes, labour costs and treatment standards will shape the best configuration. Modular capacity may suit metropolitan depots, while regional hubs may need larger batches or partnerships with specialist refiners. The ALS2 concept is strongest when its benefits match local feedstock economics.

Australia’s E-Waste and Commercial Realities

Australia’s e-waste market is fragmented by state and territory arrangements, with household recycling commonly coordinated through councils, retailer take-back schemes and approved collectors. Residents in Sydney, Melbourne, Brisbane and Adelaide can often bring old electronics to designated sites or drop them off at participating collection points. The familiar instruction to “bring it in” captures a practical step: finding an approved route is part of responsible disposal.

For commercial drives, the route can differ. Large organisations often place old servers and storage through an IT asset-disposal provider, where data sanitisation, serial-number records and secure destruction are central. A recycler then separates equipment for reuse, repair or material recovery. In Australia, these chain-of-custody expectations matter to government, finance and technology customers, so a metals trial should begin after drives are cleared for dismantling.

Geography adds another layer. A depot near a capital city may receive useful batches of retired drives, whereas drives collected from mine sites, schools or regional offices can face long, carbon-intensive transport. Western Australia’s mining sector understands mineral value and responsible recovery, while urban markets offer concentrated electronic waste. The strongest site is where reliable feedstock, secure pre-treatment and a product outlet meet.

Balancing Economics, Safety and Sustainability

The business case depends on more than the spot price of ruthenium. Recovery from a thin coating is sensitive to feed concentration, value recovered from other metals, plant utilisation and disposal costs. A small gain in selectivity can matter, but so can avoiding repeated shredding or long-distance transport. Operators should model the whole route, including pre-treatment and final refining, rather than value only the ALS2 output.

Safety remains central. Acidless separation can reduce exposure to corrosive liquids, yet hard disk destruction still involves sharp edges, rotating fixtures, metal dust, possible residues and fire risks. Drives should be opened under controlled conditions, and magnets, springs and coatings handled according to their hazards. Any cleaning or polishing chemicals must be documented and managed. Cleaner chemistry does not justify weaker controls.

Sustainability claims are strongest when specific. Operators should record energy and water use, recovered metal, residue classification and downstream treatment, then compare the results with the counterfactual route. Transparency also supports responsible-sourcing expectations in Australian supply chains. If ALS2 demonstrates consistent performance across real batches, it can contribute to circular-economy goals without asking recyclers to accept an unproven environmental advantage.

A Practical Route to Closed-Loop Recovery

A sensible deployment starts with a focused feedstock study. Map where retired HDDs are generated, separate drives likely to contain ruthenium-bearing layers, document existing sanitisation and collect representative samples. Analysis should establish metal grades and physical variability before equipment is ordered. A pilot can then compare ALS2 with current downstream options on recovery, purity, operating effort and residue management.

Partners could include council e-waste depots, IT asset-disposal firms, electronics manufacturers, universities and precious-metal refiners. A pilot in Melbourne or Sydney could test logistics and throughput, while Australian laboratory support could strengthen quality control. The project’s European research background adds collaboration value, but localisation should focus on feed characteristics, energy, transport and regulatory requirements rather than importing a plant unchanged.

Organisations that control a reliable stream of retired hard disks can begin by preparing a feedstock dossier, selecting an analytical partner and inviting Ikoi and ALS2Project to assess a representative trial. Set measurable targets for ruthenium recovery, product quality, safe handling and residual waste, and require a full mass balance before scaling. That focused first step can turn hard disk layers into a traceable part of Australia’s circular metals economy.