How ALS2 Handles Plated Steel From Old Mobile Phone Casings
Old mobile phones contain a mixture of plastics, glass, ferrous metals, non-ferrous metals and small quantities of valuable elements. Their casings can add another layer of complexity when a steel body is covered with nickel, chromium, gold or another protective and decorative coating. Recovering value from this material requires more than simply shredding the phones and sending the output to a conventional metal refinery.
ALS2, developed by Ikoi S.p.A., is designed for precious-metal recovery from electronic waste and WEEE streams without relying on aggressive acid baths. Its acidless separation approach focuses on preparing the feed, liberating the relevant materials and concentrating precious-metal-bearing fractions in a controlled recycling process.
For plated steel from old mobile phone casings, this distinction is important. The steel substrate has a different physical and economic role from the thin surface layer. A suitable process must separate or concentrate these components while limiting cross-contamination, unnecessary chemical use and the loss of recoverable metals.
Why Plated Phone Casings Require Careful Processing
A mobile phone casing is rarely a single, uniform material. Depending on the model and manufacturing period, it may contain painted steel, stainless steel, aluminium, engineering plastic, decorative plating, adhesives and inserts. Even when the casing appears to be ordinary metal, its surface may carry a thin layer with a different composition and value.
The coating is usually much thinner than the steel underneath. This creates a recovery challenge: if the casing is handled as a bulk steel fraction, the precious or specialty metal may become diluted. If it is processed too aggressively, the coating can be smeared across other materials or lost in dust and fine residues.
The presence of steel also affects downstream sorting. Ferrous pieces respond to magnetic separation, while plated particles, mixed fines and non-ferrous fragments may behave differently. Successful WEEE treatment therefore starts with a clear understanding of particle size, coating condition, casing design and the composition of the incoming batch.
Preparing Casing Material Before Separation
The first stage is controlled preparation. Recyclers typically remove batteries, circuit boards, displays and other hazardous or high-value components before the remaining casing material enters a dedicated metal recovery line. This prevents incompatible materials from reducing separation efficiency and ensures that each stream can be managed according to its composition.
Size reduction can expose plated surfaces and create a more consistent feed. However, it must be controlled carefully. Excessive shredding can generate very fine steel particles, coating fragments and dust that are difficult to sort. A staged approach, using suitable screening and material handling, helps keep the useful fractions distinct.
ALS2’s acidless concept is relevant at this point because physical preparation can be integrated with a separation route that avoids the need to dissolve the entire casing in mineral acids. The objective is to make valuable material accessible and concentrate it, rather than chemically attacking every component in the feed.
How The Steel Substrate And Coating Are Managed
Once the material has been prepared, the ferrous character of the steel provides an important separation property. Magnetic equipment can remove or concentrate steel-rich pieces, reducing the mass that must proceed to precious-metal recovery. This improves the quality of downstream fractions and prevents large quantities of low-value iron from overwhelming the process.
Plating does not always remain attached to the steel after size reduction and mechanical treatment. Some of the coating may stay on the substrate, while some may appear as fine liberated particles. The process must therefore account for both composite pieces and detached coating residues. Screening, density differences, air classification or other physical methods may be used as part of the complete plant configuration.
The exact sequence depends on the feedstock and the target metals. ALS2 should be understood as a technology platform for acidless precious-metal separation rather than a single universal setting for every phone casing. Plant operators can adapt preparation and classification stages to the material’s physical characteristics while maintaining a cleaner recovery route.
The result is a set of more concentrated outputs: a steel-rich fraction suitable for ferrous recycling, non-ferrous and mixed-metal fractions requiring further assessment, and a precious-metal-bearing fraction that can be processed for recovery. Keeping these streams separate is essential for both yield and commercial value.
| Processing concern | Conventional risk | Acidless ALS2 approach |
|---|---|---|
| Steel substrate | Large quantities of iron dilute valuable material | Concentrate or remove ferrous material through physical separation |
| Thin plating | Coating can be lost in mixed shredder residue | Use controlled liberation, screening and fraction management |
| Acid consumption | Bulk steel and unwanted materials may consume reagents | Avoid dissolving the whole feed with aggressive acids |
| Cross-contamination | Fine particles can spread across several outputs | Design preparation and classification around feed composition |
| Residues | Liquid effluent requires treatment and monitoring | Reduce dependence on acid leaching and associated liquid waste |
| Plant operation | Recovery may rely on external refining routes | Support compact precious-metal recovery configurations |
Why Acidless Recovery Matters For WEEE
Traditional hydrometallurgical refining can be effective, but acid-based treatment often requires careful reagent control, corrosion-resistant equipment, ventilation, liquid effluent management and additional treatment of spent solutions. These requirements become especially significant when the feed contains large amounts of steel, plastics or other materials that do not contribute to the target metal yield.
An acidless route changes the role of the process. Instead of dissolving the casing and later separating metals from a chemical solution, the system aims to exploit differences in physical properties and material liberation. This can reduce the amount of unwanted material entering the valuable fraction and limit the generation of acid-containing wastewater.
The environmental benefit is linked to the whole process rather than to one isolated machine. Better sorting can reduce transport of low-value material, improve the efficiency of precious-metal recovery and support the return of steel and other metals to established recycling chains. It also aligns with the broader circular-economy goal of recovering resources already present in discarded electronics.
This does not mean that every residue disappears or that every casing can be processed identically. Dust, mixed fractions and non-recoverable components still require responsible management. The advantage is that the process is designed to reduce reliance on a chemical-intensive path and to make material flows more transparent.
Integrating Mobile Casings Into A Recovery Plant
A compact recovery plant must be designed around the actual feed rather than an idealized sample. Old mobile phones vary considerably by brand, age and construction. A campaign containing mostly painted aluminium will behave differently from one containing plated steel shells, stainless components and mixed electronic assemblies.
Before processing, operators should characterize the material through sampling. Useful information includes ferrous content, particle-size distribution, moisture, coating type, expected precious-metal concentration and the proportion of plastics or non-metallic material. This information supports decisions about dismantling, shredding, magnetic separation and the configuration of the ALS2 recovery stages.
Feed consistency is also important. Blending compatible batches can stabilize throughput, while keeping unusual or highly contaminated material separate can protect recovery performance. Clear fraction tracking allows operators to identify where valuable metals are concentrated and whether a stream should be recycled, reprocessed or sent to a specialist refiner.
In this setting, ALS2 technology can form part of a broader WEEE recycling system. It does not replace responsible collection, depollution or dismantling. Instead, it provides a route for recovering precious-metal value from prepared electronic waste while allowing steel and other bulk materials to follow appropriate recycling channels.
Practical Priorities For Better Results
- Remove batteries, circuit boards and hazardous components before casing treatment.
- Characterize each incoming batch for steel content, plating and particle-size distribution.
- Use controlled size reduction to expose coatings without creating excessive fines.
- Keep ferrous, non-ferrous, mixed and precious-metal-bearing fractions separately identified.
- Review recovery data regularly and adjust feed preparation to the material being processed.
Good process control begins before the first casing enters the equipment. Accurate weighing, representative sampling and documented fraction outputs make it possible to measure recovery performance rather than relying on visual inspection. They also help demonstrate the value of diverting old phones from disposal.
Operators should treat plated steel as a composite feed with several possible destinations. The steel can enter a ferrous recycling stream, while surface-related value may be concentrated for precious-metal recovery. This approach is more efficient than assuming that the entire casing belongs in either a steel furnace or a chemical refining bath.
The wider benefit is traceability. When the feed is separated into defined outputs, recyclers can report recovered metals, recycled steel and residual material more accurately. That supports compliance, commercial planning and the environmental objectives associated with modern WEEE management.
Old mobile phone casings illustrate why electronic waste recovery needs both technical precision and flexible plant design. Their steel structure can be separated using its ferrous properties, while thin plated layers require controlled liberation and concentration to avoid value dilution. ALS2’s acidless separation technology supports this model by focusing on physical recovery and reduced dependence on aggressive chemical treatment.
For recyclers, technology developers and organisations managing WEEE streams, the next step is to assess actual casing material through representative sampling and process trials. Explore the ALS2 project and Ikoi S.p.A.’s acidless recovery technology to evaluate how plated steel, electronic scrap and other precious-metal-bearing fractions can be integrated into a cleaner, compact recycling process.