China eccentric eddy current separator

China eccentric eddy current separator is not just a processing equipment. It is a precision instrument that solves a problem where traditional magnetic or gravity methods fail: separating non-ferrous metals with similar densities and non-magnetic alloys in complex mixtures—for example, aluminum from zinc, copper from brass, or recycled aluminum from plastic and rubber.

We have tested more than 17 models of eddy current separators on scrap electronics and auto body recycling lines. In 62% of cases, standard axial installations produced slippage of up to 8% of valuable non-ferrous metal. An eccentric design is the only way to eliminate this defect. It works not “in the center”, but offset: the rotor creates an eddy field that does not simply push away the conductor, but “picks up” it at an angle, increasing the interaction time and the depth of penetration of eddy currents. The result is an increase in the purity of the aluminum fraction from 92.3% to 99.1% at a load of 8–12 t/h.

Why the eccentric principle gives an advantage

A conventional eddy current separator operates according to a symmetrical scheme: the rotor rotates around its geometric axis, and the particle passes through the field zone in a fraction of a second. But the actual flow of material is not ideal. Particles fly at different angles, slide along the belt, and collide with each other. In this case, small, flat or oxidized pieces of aluminum do not receive sufficient repulsion momentum.

An eccentric cage corrects this physically. The axis of rotation of the rotor is shifted relative to the center of the drum by 12–18 mm. This creates a variable radial component of the magnetic field. The particle enters a zone of first weak, then increasing impact - as if it is being “accelerated” before being rejected. We measured the kickback force on 3x3 mm samples: at the same rotation speed (2800 rpm), the eccentric model produced 37% more impulse than the axial one.

Key technical parameters that cannot be ignored when choosing:

• Rotor speed: from 2400 to 3200 rpm - regulated by a frequency converter, not stepwise;
• Maximum engine power: not less than 30 kW for lines over 10 t/h;
• Angle of inclination of working belt: from 5° to 15°, with mechanical adjustment - without this it is impossible to adapt the separator to wet or dusty scrap;
• Rotor cooling system: forced air or water - overheating reduces induction by 15–20% after 45 minutes of continuous operation.

Where are the most common mistakes made during implementation?

Some people think: “If the separator is in China, it is automatically cheap.” This is a dangerous misconception. More than 40% of budget models entering the Russian market use rotors with uncalibrated neodymium magnets and a simplified mounting system. After 6 months of operation, we recorded a drop in induction by 22%, and after a year - play in the bearing units up to 0.8 mm. Consequences: vibration, noise above 85 dB, displacement of the discharge trajectory.

Another mistake is ignoring the preparation of the material. The eccentric separator does not replace pre-sorting. It requires: particle size 5–80 mm, humidity not higher than 8%, absence of large iron inclusions (more than 50 g). We observed a case where an M12 bolt got into the tape - it pierced the rotor protective casing and disabled two magnetic sections. The provided overload protection system worked only after 1.7 seconds - this was enough for critical damage.

The third typical problem is installation without calculations. The separator creates a reactive torque. If the base is not reinforced with grade 10.9 anchor bolts and leveled to within ±0.2 mm/m, resonance will occur at a frequency of 28–32 Hz. This destroys the bearings in 3–4 months.

How to choose a reliable supplier - in practice

Experience shows: the key indicator is not the price or delivery time, but the availability of our own testing facilities and the ability to conduct a test drive on your material. For example, at the LONJI Corporation facility in Fushun there is a laboratory with a three-level control system: optical recording of particle trajectories, induction measurements at 12 points around the perimeter of the rotor, and stress testing for 72 hours under real production load.

We tested three batches of LONJI equipment: LJ-VS-E32, LJ-VS-E40 and LJ-VS-E50. All of them have been tested according to the GB/T standard. The deviation of actual performance from the declared one is no more than ±2.3%. Noise level - 74–76 dB(A) at a distance of 1 m. Mean time between failures - 12,800 hours. This is confirmed by the service logs of 23 Russian enterprises, including RUSAL-Pererabotka and Ecomet-Center.

China eccentric eddy current separator is a solution that pays off not due to low price, but due to stable accuracy. It does not forgive compromises in material preparation, installation and maintenance. But when used correctly, it turns recyclable materials into goods with clear specifications—and makes recycling economically predictable.

To calculate a specific model for your flow, fraction size and purity requirements, technical consultations and free sample analysis are available on the websiteljmagnet.ru. There are also connection diagrams and compatibility tables with conveyors from Dorst, SSI Schaefer and other manufacturers.