ALS2 for platinum recovery from glass fiber bushing tips
Platinum recovery can begin in unexpected industrial places. In glass-fibre production, molten glass is drawn through fine openings in platinum-rhodium bushing assemblies. The tips endure extreme heat, wear and chemical attack, so damaged components are periodically removed and become a valuable metal-bearing scrap stream. Applying ALS2 for platinum recovery from glass fiber bushing tips offers a way to separate that value without relying on the corrosive acid leaching traditionally associated with precious-metals refining.
For Australian operators, the challenge is turning a small, specialised stream into a dependable feedstock. Bushing tips are not accepted at ordinary household recycling facilities, and their value can be hidden beneath glass, ceramic and other residues. ALS2 Project, supported by the European Union’s Horizon 2020 research and innovation programme, develops acidless separation technology that could make compact, source-side recovery more practical for industrial wastes, including relevant fractions from electronic equipment.
Why spent bushing tips matter
A spent bushing tip is more than a damaged manufacturing component. Its platinum-rhodium alloy may contain recoverable precious metals whose value would otherwise be lost when the component is treated as industrial waste. The surrounding glass and ceramic contamination also creates a useful separation challenge: the objective is to concentrate the metal-bearing fraction while reducing the amount of low-value material sent to final refining.
The commercial case depends on more than the platinum price alone. Clean material, consistent alloys and predictable volumes make a stream easier to process. Operators should therefore establish whether bushings came from one production line or several, whether they are mostly platinum-rhodium or include other alloys, and how much contamination remains after removal from the furnace.
The practical differences between established acid routes and ALS2 can be summarised as follows:
| Consideration | Acid-based refining | ALS2 acidless separation |
|---|---|---|
| Main approach | Dissolves metal-bearing material in corrosive acid before selective recovery | Concentrates and separates valuable fractions without acid leaching as the primary separation step |
| Chemical handling | Requires acids, neutralisation and controls for corrosive liquids and salts | Reduces dependence on hazardous acid handling at the separation stage |
| Feed preparation | Generally benefits from uniform, well-characterised material | Can be adapted to heterogeneous waste streams after sorting and feed trials |
| Plant requirements | Often suited to large, centralised refineries | Designed around compact recovery units located near waste generators |
| Residues | Can include liquid effluent and chemically altered solids | Aims to reduce hazardous liquid waste, although solid residues still require appropriate treatment |
| Remaining work | Mature refining routes are widely available | Final assay, purification and metal finishing may still be required |
This comparison does not make acidless separation automatically cleaner or cheaper in every case. A credible evaluation still needs measured recovery rates, reagent requirements, residue volumes, energy use and realistic transport costs. Its strongest advantage is the possibility of shifting valuable metal away from a lengthy acid-based circuit before it reaches a full-scale refinery.
How ALS2 changes the separation route
The central idea behind ALS2 is to address the most hazardous and material-intensive part of recovery: separating metals from mixed waste without first dissolving everything in acid. Instead of making every component liquid, the process focuses on preparing and distinguishing metal-bearing fractions that can be handled more efficiently. That is particularly relevant when the feedstock contains several forms of glass, ceramics, plastics and metals.
The ALS2 separation technology is being developed by Ikoi S.p.A. with support from Horizon 2020, linking research, engineering and the needs of real waste streams. The project’s focus on safer, cleaner separation is especially relevant to compact precious-metals recovery plants, where operators may have limited space, chemical-storage capacity and specialist refining staff.
Acidless does not mean risk-free. Precious-metal concentrates may still contain hazardous components, and final metal quality must meet refinery specifications. It also does not remove the need for good sampling, assay work and downstream processing. The important distinction is that ALS2 aims to make the initial recovery stage less dependent on destructive acid chemistry, potentially leaving a smaller and more concentrated stream for specialised finishing.
An Australian market perspective
Australian recyclers usually say “e-waste” in everyday conversations, while WEEE is the more formal industry term. People often ask whether old phones or computers can be taken “through the tip”, but municipal depots have limits and generally do not accept industrial bushing tips. These components need to move through a waste contractor or specialist metals-recovery channel where their alloy identity and value can be assessed.
The opportunity is strongest around industrial corridors in Melbourne, Sydney, Newcastle and Perth, where glass-fibre, engineering and manufacturing activities coexist with established waste and logistics networks. Rather than shipping low-value contaminated tips long distances, an operator could evaluate source-side separation close to the plant. This matters in a geographically expansive market, where transport from Western Australia to eastern processing centres can quickly erode the value of a relatively small scrap stream.
Australia also has little primary platinum refining compared with its mineral and manufacturing sectors. Recovered platinum-group metals may therefore travel to specialist refineries overseas before returning to industrial users. Local separation can still create value by producing a smaller, higher-grade concentrate, reducing the mass that must be exported and improving traceability through the supply chain.
Regulatory arrangements differ across states and territories, especially for industrial waste and cross-border movement. A plant considering spent bushings should confirm classification, transport and residue-handling requirements before storing or processing them. A dedicated bushing-tip stream should also be kept separate from mixed consumer e-waste, where dilution could make the platinum content harder to recover economically.
Designing a safe, compact recovery operation
Safety planning must account for the physical hazards as well as the chemical ones. Broken glass, sharp alloy edges, ceramic dust and possible silica-containing residues require controlled handling, suitable ventilation, local extraction and appropriate personal protective equipment. Hot or furnace-contaminated material may need cooling and inspection before it enters a mechanical separation line.
A compact installation offers flexibility, but compactness should not come at the expense of containment, dust control or reliable weighing and sampling. The equipment must handle variable tip sizes, residual glass and changing feed composition without creating uncontrolled losses. Operators also need a clear route for every output fraction, including material that proves unsuitable for precious-metals recovery.
Commercial validation should begin with representative samples rather than a full plant trial. Useful information includes monthly quantities, alloy grades, existing handling costs, available assay data and transport arrangements. A trial can then establish recovery performance and identify where conventional finishing steps are needed. This staged approach limits capital exposure while giving Australian suppliers and recyclers evidence they can use in an investment decision.
Turning a scrap stream into circular value
The first stakeholders are likely to include glass-fibre manufacturers, specialist industrial waste contractors, non-ferrous metal recyclers and precious-metals refiners. Each holds part of the information needed to make recovery work: the producer understands service life and contamination, while the contractor and recycler understand logistics, equipment and downstream acceptance.
A useful initial engagement would provide a representative bushing-tip sample, its approximate weight, production history and available material information. The sample can be assessed for composition and separation potential before either side commits to a larger trial. This also helps distinguish genuine high-grade bushing scrap from material whose platinum content is too low or inconsistent to support a commercial recovery route.
Australian glass-fibre operators and recycling specialists can move from interest to evidence by submitting a representative bushing-tip lot for ALS2 evaluation. Put the material in front of the ALS2 team, document its composition and establish whether acidless separation can recover its precious-metal value at a commercially viable scale.