Recovering Gold From Ceramic IoT Antenna Substrates With ALS2
Connected devices are becoming smaller, smarter and more numerous, from tracking tags and smart meters to industrial sensors and home automation equipment. Many use ceramic antenna substrates with thin metallised layers that can contain gold, silver, copper and nickel. Individually, these parts hold little precious metal; together, they can represent a useful secondary resource when recovered from large electronic waste streams.
ALS2 offers a pathway for treating these difficult, compact components without relying on conventional acid-based refining. Its acidless separation approach is designed for precious-metal recovery from WEEE and electronic scrap, supporting compact plants that can operate closer to collection, dismantling and pre-processing centres.
| Recovery approach | Treatment of ceramic antenna substrates | Main advantage | Main consideration |
|---|---|---|---|
| Manual sorting | Identifies selected boards or modules | Simple starting point for high-value fractions | Labour-intensive and inconsistent |
| Conventional acid refining | Dissolves targeted metals chemically | Well-established industrial route | Requires hazardous reagents, controls and effluent management |
| Thermal processing | Concentrates metals through heating | Can handle mixed feed | Energy use and emissions must be managed |
| ALS2 acidless separation | Uses controlled physical and process separation | Lower chemical burden and suitable for compact recovery plants | Feed preparation and validation remain essential |
Why ceramic antenna substrates matter
Ceramic antenna components are used where dimensional stability, high-frequency performance and resistance to heat are important. Alumina and other engineered ceramics can carry printed or plated conductive tracks, terminals and contact pads. A very thin gold finish may protect an underlying nickel or copper layer from corrosion and preserve reliable electrical contact.
The gold content is generally too low to justify treating each antenna as a separate product. The commercial opportunity appears when manufacturers, repairers, contract assemblers and recyclers collect thousands of similar components. Production rejects, obsolete gateways, wireless modules and end-of-life sensors can then be combined into a consistent feedstock rather than lost in mixed shred.
The ceramic body also makes separation more complex. It is brittle, non-metallic and often bonded to plastics, solder, circuit boards or shielding. A recovery plant needs to liberate the valuable fraction while avoiding excessive fines that can complicate handling, sampling and dust control.
Preparing IoT scrap for separation
Good feed preparation begins before the material reaches an ALS2 line. Reuse and refurbishment should remove functioning devices, while dismantling can separate batteries, displays, cables, large steel parts and hazardous components. Boards and antenna modules can then be sorted into a more predictable fraction for size reduction and concentration.
Controlled crushing or granulation may expose plated surfaces, but aggressive comminution can create ceramic dust and smear ductile metals across other particles. The correct settings depend on substrate design, adhesives, solder content and the proportion of plastic in the feed. Enclosed equipment, extraction and appropriate personal protective equipment are fundamental rather than optional.
Sampling is equally important. A small handful of antenna parts cannot represent a truckload of mixed IoT equipment. Operators should record source, product type, batch size and preparation method, then use repeatable sampling and laboratory assays to estimate gold, silver, copper and nickel grades.
How ALS2 supports precious-metal recovery
ALS2 is intended to separate and recover valuable metals through an acidless process architecture. That distinction matters for ceramic antenna substrates because the feed can contain a mixture of inert mineral material, base metals, polymer residues and precious-metal-bearing surfaces. A process that reduces dependence on strong acids may simplify reagent storage, liquid effluent management and workplace controls.
The technology should be assessed as part of a complete flowsheet rather than as a standalone answer to every feed problem. Upstream sorting, liberation and classification influence the grade presented to the recovery stage. Downstream concentrate handling, metal finishing and residue verification determine whether the operation achieves a commercially useful recovery rate.
Teams evaluating the process can review the ALS2 project technology alongside their own feed data. Useful questions include how the equipment responds to ceramic fines, how gold-bearing concentrates are sampled, what residue specifications apply and which operating parameters are validated for a particular antenna design.
Building a compact recovery plant
A compact plant can be attractive when feed is generated by several regional sources rather than one massive electronics factory. A modular arrangement may include receiving and inspection, safe dismantling, size reduction, separation, concentrate collection and quality control. This can reduce transport of low-value mixed material and keep the higher-value fraction under closer control.
For an IoT recycler, the most efficient layout is unlikely to process every incoming item in the same way. A high-grade stream of ceramic antenna substrates can be directed to a dedicated preparation route, while ordinary mixed printed circuit boards follow another pathway. Clear material identification helps prevent dilution and makes production records easier to audit.
Automation can improve consistency, though it does not remove the need for skilled operators. Sensors, weighing systems, dust monitoring and batch tracking help identify changes in feed quality. In a smaller facility, practical housekeeping and reliable maintenance may deliver greater value than an overly complex line that is difficult to service.
An Australian operating context
Australia has strong reasons to consider local treatment. Electronic waste is generated across Sydney, Melbourne, Brisbane, Perth and Adelaide, yet the country’s long transport distances can make it costly to move low-grade mixed scrap. A recycler near a metropolitan dismantling hub could pre-process IoT equipment locally and send a concentrated precious-metal fraction to a specialist recovery stage.
The market also includes regional councils, transfer stations, business technology refresh programmes and national product-stewardship networks. Kerbside collection is not a universal solution for electronics, so commercial take-back, council drop-off sites and e-waste contractors all contribute to the supply chain. State rules differ, and operators must check requirements for storage, transport, batteries, dust and residues before setting up a plant.
Perth and Western Australia offer a particularly relevant conversation between urban e-waste collection and a mining-aware processing economy. In New South Wales and Victoria, dense business and consumer markets can support steady volumes of retired connected equipment. The practical Aussie rule is simple: account for freight, seasonal collection changes and site access before relying on a feedstock model that looks attractive on paper.
Safety, sustainability and recovered value
Removing acid from the core separation route can reduce risks associated with corrosive chemicals and liquid waste, but it does not make the process risk-free. Ceramic dust, fine metal particles, noise, moving machinery and contaminated incoming equipment still require engineering controls, procedures and training. Batteries and damaged devices must be isolated before mechanical treatment.
Environmental performance should be measured across the whole operation. Relevant indicators include electricity consumption, water use, reagent use, transport distance, recovery yield and the fate of non-metallic residues. A process that recovers gold efficiently but sends poorly characterised ceramic or polymer residue to disposal may leave part of the sustainability opportunity unrealised.
Recovered gold also needs a credible chain of custody. Batch records, assay results and documented transfer to an approved refiner help demonstrate that the output is genuine secondary metal. For manufacturers, recyclers and public-sector procurement teams, traceability can be as important as the headline recovery percentage.
Moving from trials to regular production
A sensible evaluation starts with representative ceramic antenna substrates from actual Australian IoT streams. Separate samples by device family, manufacturer, age and construction, then test liberation behaviour, concentrate grade, recovery, residue quality and operating cost. Pilot work should include enough material to reveal variability rather than relying on a polished laboratory sample.
Commercial decisions can then compare the value of recovered gold and other metals with labour, transport, energy, maintenance, compliance and residue costs. Copper and silver may contribute substantially to the economics, while cleaner feed preparation can improve performance across the entire recovery line. The best result is often a stable, well-characterised feed rather than the highest possible grade from occasional hand sorting.
Recyclers, equipment developers and IoT manufacturers can now map their local supply, prepare representative samples and assess an ALS2-based route for ceramic antenna recovery. Explore the project’s technology, sustainability objectives and research background at the ALS2 Project website, then use verified feed data to plan a safer and more resource-efficient precious-metal recovery operation.