Recovering gold from ceramic DIP ICs with ALS2 acidless technology
Ceramic dual-inline package integrated circuits might look like relics from a bygone electronics era, yet they quietly harbour some of the richest pockets of recoverable gold found anywhere in the waste stream. Hidden beneath the alumina or beryllia lids, fine gold wire bonds and plated lead frames sit untouched long after the boards have been pulled from service. As Australia's stockpile of legacy industrial and defence electronics continues to grow, those tiny ceramic chips are drawing fresh attention from recyclers who want a cleaner path to the gold inside.
For decades, recovery meant strong mineral acids, aqua regia baths, and the kind of fume-heavy operations that no regulator loves. That approach pulls gold out efficiently, but it leaves behind acidic sludge, contaminated rinse water, and a long compliance tail. The operators running compact plants in suburban industrial estates around Sydney and Perth have felt that pressure most acutely, with local councils tightening discharge rules year on year.
ALS2 offers a different route. Developed under the European Union's Horizon 2020 research and innovation programme by Ikoi S.p.A., the process separates precious metals without relying on aggressive acid leaching. The result is a workflow that fits smaller footprints, fewer permits, and a much friendlier reception from environmental authorities.
For Australian recyclers, the timing is good. The National Television and Computer Recycling Scheme has pushed volumes higher, while state-based e-waste bans in Victoria and New South Wales are keeping more end-of-life electronics inside the country. Ceramic DIP ICs sourced from decommissioned telecommunications gear, old medical instrumentation, and aged industrial controllers are now a credible secondary feed for gold recovery operations that previously relied solely on mined doré.
Why ceramic DIP packages still matter
Ceramic dual-inline packages were the workhorses of through-hole electronics from the 1960s through the 1990s, before plastic DIPs and surface-mount packages took over consumer gear. They were specified wherever heat dissipation mattered, where hermetic sealing was required, or where long-term reliability under thermal cycling was non-negotiable. Think of mainframe peripherals, avionics, military radios, process control racks, and the early generation of Australian-built telecommunications infrastructure.
Their construction is part of the appeal for recyclers. The ceramic body is metallised, the lead frame is heavily plated, and the internal die is connected with wedge or ball bonds of nearly pure gold wire. Unlike plastic encapsulated chips, ceramic DIPs can be cracked open mechanically, exposing clean metal surfaces that respond well to physical separation techniques. That mechanical accessibility is exactly the kind of feedstock ALS2 was designed around.
There is also a nostalgia factor that should not be dismissed. Vintage computer hobbyists across Melbourne and Adelaide are already pulling these chips for component harvesting, and a growing network of repair cafés funnels unsalvageable boards into proper recycling channels. Each pathway ultimately lands ceramic DIPs at the same doorstep: a recovery plant that needs to extract value from parts most people would otherwise scrap.
Where the gold actually lives
Understanding the gold distribution inside a ceramic DIP helps explain why recovery is worth pursuing at all. The bulk of recoverable value sits in three distinct locations: the gold-plated Kovar or Alloy 42 leads, the gold bond wires running from the die to the lead frame, and the thin metallisation layer on the ceramic substrate itself. Plating thickness on premium-grade ceramic DIPs can reach several microns, which sounds small but adds up quickly when bins of these chips are processed together.
Bond wires are particularly attractive because they tend to be high-purity gold, often 99.99% or better, with no alloying elements to complicate downstream refining. Substrate metallisation is more variable, typically a gold-tin or gold-nickel blend, but it still responds to the right separation approach.
The challenge with traditional methods is selectivity. Acid leaching dissolves gold along with copper, nickel, tin, and a long list of base metals, then demands a complex precipitation and electrowinning train to pull the gold back out. Each step eats into yield and adds reagent costs. ALS2 sidesteps much of that chemistry by exploiting the mechanical and electrochemical differences between the gold-bearing phases and the surrounding ceramic matrix.
How ALS2 handles ceramic substrates
The ALS2 workflow leans on a controlled reactor vessel where the ground ceramic matrix is exposed to a tailored electrolyte under specific electrical conditions. Rather than dissolving everything indiscriminately, the process liberates gold preferentially while leaving the ceramic fines and base metals in a separate stream. The mechanical pre-processing stage is critical for ceramic DIPs because the hard alumina casing needs to be reduced to a fine, consistent particle size before the reactor can do its work.
Pre-crushing and milling of ceramic packages has to be done carefully. Aggressive hammer mills produce too many fines and contaminate downstream streams, while gentle crushers leave intact pieces that pass through unreactive. Operators running ALS2 pilots have settled on a two-stage approach that cracks the ceramic, exposes the lead frame and bond wires, then feeds the liberated material into the reactor vessel in a controlled slurry. A closer look at the reactor vessel design explains why the geometry and electrode placement matter so much when handling abrasive ceramic feedstocks.
The output is a gold-bearing concentrate that can be melted, sampled, and sold directly, rather than a dirty pregnant solution that needs stripping, precipitation, and smelting. For an operator used to managing acid baths, the change in daily routine is significant, and so is the change in regulatory reporting.
Reactor design that fits the feed
A reactor vessel that handles ceramic-loaded slurries has to manage abrasion, electrical contact, and consistent mass transfer all at once. The engineers behind ALS2 paid particular attention to electrode durability, because gold-bearing ceramic fines are unforgiving on surfaces that are not built for them. Internal geometry is shaped to keep solids suspended without creating dead zones where gold particles can settle and become unrecoverable.
Anyone wanting to understand the engineering choices in detail can read this deep dive into the reactor vessel design behind ALS2. It walks through how the vessel was iterated to handle abrasive feedstocks and how electrode materials were selected for long service life under continuous duty cycles.
For Australian operators weighing whether to retrofit an existing bench or commission a new line, those design decisions translate directly into maintenance intervals, downtime costs, and the realistic payback period on capital. A vessel that runs for months between electrode changes is a very different proposition from one that needs weekly attention in a remote site near Kalgoorlie or Mount Isa.
Australia's e-waste backdrop
Australia generated more than 600,000 tonnes of e-waste in the most recent reporting year, and the trajectory is still climbing as households upgrade phones, laptops, and whitegoods. Ceramic DIPs are a small slice of that total by weight, but a disproportionately valuable slice by contained metal. Recovering them efficiently requires plants that can run on niche feedstocks without bleeding money during slow weeks.
State-level regulations are reshaping how material flows. New South Wales, Victoria, and most recently Western Australia have introduced e-waste bans from landfill, which means more end-of-life electronics is being channelled toward accredited recyclers. Councils from Brisbane to Hobart have set up drop-off days, and operators like MRI e-cycle and TES have expanded their processing footprints. The result is a steady, traceable stream of legacy electronics that increasingly includes ceramic DIPs pulled out of industrial decommissioning projects.
Plenty of Australian e-waste operators started out tinkering with small-batch chemistry in the shed, the kind of person who would mix up DIY cleaning solutions on a Sunday arvo and then scale that same instinct into a licensed recovery business. That grassroots origin explains some of the can-do attitude in the sector, but regulators have spent years pushing the industry toward formal safety systems and audited processes. A shift supervisor at a Brisbane plant summed it up by saying the team just wants something that works, does not choke on them, and keeps the council from breathing down their necks.
Comparing ALS2 with traditional acid leaching
The table below sets out the main operational differences between a conventional acid leach line and an ALS2 plant working ceramic DIP feedstocks. It draws on the published performance figures from the Horizon 2020 project and on field observations from early adopters in Europe.
| Parameter | Conventional acid leach | ALS2 acidless separation |
|---|---|---|
| Primary reagents | Aqua regia, nitric acid, sulfuric acid | Tailored aqueous electrolyte, recycled in loop |
| Waste stream output | Acidic sludge, contaminated rinse water | Ceramic fines, base metal cake, dry gold concentrate |
| Regulatory complexity | High, often EPA-licensed discharge | Lower, dry outputs easier to classify |
| Plant footprint | Medium-large, separate wet benches | Compact, single integrated line |
| Suitable for ceramic DIPs | Yes, but aggressive on components | Yes, designed around abrasive ceramic feedstocks |
| Yield variability | Moderate, depends on acid strength and contact time | High consistency, mechanical pre-processing controls feed |
| Operator skill profile | Wet chemistry trained | Process control and electrical monitoring |
| Suitability for suburban sites | Restricted by trade waste rules | More permissive under typical council discharge limits |
The numbers tell a clear story. For an operator sitting in a light-industrial zone in western Sydney or the northern suburbs of Perth, the trade waste agreement is often the binding constraint on growth, rather than the metal market itself.
Taking the next step
Operators in Australia who are staring at pallets of ceramic DIPs and wondering whether the contained gold justifies a dedicated recovery line now have a credible technology pathway to evaluate. ALS2's acidless approach lines up with the country's tightening e-waste rules, its push toward circular economy targets, and the practical reality of running a compact plant in a suburban industrial estate. Before commissioning any new system, it pays to run a feedstock audit, weigh the contents of a representative batch of ceramic DIPs, and confirm that the contained gold supports the capital case. Engineers at Ikoi S.p.A. and the ALS2 project partners are available to walk Australian recyclers through pilot trials, vessel sizing, and integration with existing shredding and sorting lines. Reaching out early helps align site preparation, electrical supply, and licensing timelines so the plant can come online without unnecessary hold-ups.