Recovering Non-Ferrous Metals from Mixed Waste: An Eddy Current Separator Application in Mexico

Eddy current separation is the established industrial method for recovering non-ferrous metals — primarily aluminum — from mixed waste streams including municipal solid waste, automotive shredder residue, and e-waste. Well-configured eddy current systems achieve recovery rates exceeding 95% with aluminum concentrate purity suitable for direct smelting. Facilities that rely on manual sorting alone typically recover 60–75% of available non-ferrous content, leaving significant revenue on the sorting room floor.

This illustrative case describes a mixed-waste processing facility in northern Mexico handling over 400 metric tons of mixed waste per day. The facility's existing recovery process relied on overband magnets for ferrous removal and manual pickers for non-ferrous — a combination that limited aluminum recovery and was sensitive to operator absenteeism and fatigue.

Requirements

• Automated non-ferrous separation processing ≥ 1 MT/hr on a single unit
• Particle size range: 5–200 mm (covering crushed aluminum cans, copper wire fragments, and small electronic components)
• Operation in dusty, variable-humidity outdoor conditions
• Minimal operator intervention during continuous production runs

Machine Deployed: Reylong JLECS-1000W

The Eddy Current Non-Ferrous Metal Separator Line (Model JLECS-1000W) combines three separation stages in one system. Key specifications:

• Capacity: 1,000 kg/h
• Separation particle size: 5–200 mm
• Working width: 1,000 mm
• Magnetic field strength: 3,000 GS
• Max rotor speed: 3,000 RPM
• Three-stage integrated system: vibratory feeder → high-intensity magnetic drum (ferrous removal) → eddy current roller (non-ferrous ejection)
• Total power: 12 kW
• Machine dimensions: 4,500 × 2,100 × 2,500 mm / Weight: 3,400 kg

The adjustable splitter plate allows operators to fine-tune the separation boundary between aluminum, other non-ferrous fractions, and residual waste — enabling optimization for different input compositions without stopping the line.

How eddy current separation actually works

The rotor spins a set of permanent magnets at up to 3,000 RPM inside a non-metallic shell. Any conductive fragment passing over it meets a rapidly alternating magnetic field, which induces circulating currents inside the fragment itself — the eddy currents. Those currents generate their own magnetic field opposing the rotor's, and the resulting repulsion throws the fragment forward, away from non-conductive material that simply falls. Because the effect scales with a material's conductivity-to-density ratio, aluminum separates most readily, copper and brass less so, and stainless steel barely at all. That is why an aluminum-dominant input stream reaches the high end of the recovery range while mixed non-ferrous fractions do not.

Outcome

• Non-ferrous recovery rate exceeded 95% on aluminum-dominant input streams, consistent with published performance benchmarks for high-intensity eddy current systems at 3,000 GS field strength
• Ferrous pre-removal via the integrated magnetic drum stage protected the eddy current rotor from magnetic contamination and extended service intervals
• Manual picking positions reduced from 4 to 1 — one operator for quality spot-checking, versus full manual sorting previously
• Throughput: 950–1,000 kg/hr achieved on shredded mixed-metal input within the rated capacity range

What limits recovery in practice

Rated recovery assumes conditions a working plant has to maintain. Fragment shape matters: flat, tumbling pieces couple with the field better than compact balled-up ones, so over-shredded input can recover worse rather than better. Moisture makes light fractions stick to heavier residue and cross the splitter together. Residual ferrous material is the most damaging — it clamps to the rotor shell, heats it, and drags recovery down until it is cleared, which is precisely why the magnetic drum stage sits upstream rather than being treated as optional. The splitter plate then needs re-checking whenever input composition shifts, since the boundary that suited crushed cans will not suit wire fragments.