Selecting an eddy current separator for aluminum recovery requires matching rotor geometry to particle size. Concentric designs deliver economic recovery on coarse aluminum above 20 mm. Eccentric designs achieve superior recovery on fine aluminum below 15 mm, where conventional units lose metal to the reject stream. The correct choice depends on the particle size distribution your scrap processing line produces.
Concentric Rotors: Coarse Aluminum Efficiency
Concentric rotors center the magnetic assembly within the shell, distributing field force around the full pulley circumference. This design tolerates feed variation and handles 20–150 mm aluminum at throughputs up to 25 t/h on a 2,000 mm belt. Recovery on 20–50 mm feed reaches 93–97%—equivalent to eccentric performance. The simpler construction prices 20–30% below an equivalent eccentric unit, and maintenance access is straightforward.
The limitation is field strength at the belt surface. Because the magnetic flux must travel through the full shell clearance, fine aluminum particles receive insufficient repulsive force. On 5–10 mm feed, concentric recovery falls to 65–78%. Stray ferrous particles are also held against the belt by the full-circumference field, causing induction heating that damages the belt over time.
Eccentric Rotors: Fine Aluminum Recovery
Eccentric designs offset the magnetic rotor so field energy concentrates only in the throw quadrant. Surface flux density in this zone is substantially higher, enabling recovery of aluminum particles down to 3–5 mm. On 5–10 mm feed, recovery reaches 80–90%—a 10–15 percentage point advantage over concentric designs.
The eccentric geometry also reduces belt wear. Ferrous stragglers pass most of the pulley circumference outside the magnetic field, releasing instead of being pinned and heated. The 20–30% price premium is typically recovered within the first year through higher aluminum yield and lower belt replacement cost on fine streams.
Integration and Feed Preparation
No eddy current separator compensates for inadequate upstream preparation. Ferrous removal must precede the ECS; iron and steel are attracted to the rotor and disrupt separation. Screening into controlled size fractions ensures a monolayer feed. For shredder-based aluminum recovery, upstream equipment selection determines the particle size distribution the separator receives. Reference the Crusher and Crusher Machine options, confirm screening through the Vibrating Screen Machine, and evaluate primary shredding with the Double Shaft Shredder Machine or fine liberation with the Single Shaft Shredder.
Supplier Evaluation
A material test with representative aluminum scrap is the only reliable method to confirm recovery and purity. Request test data at your target feed rate and particle size distribution. Confirm rotor serviceability and belt access. For complete line configurations, HUATAO provides recycling equipment and shredder-related solutions; technical specifications should be confirmed through direct consultation.
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