China electromagnetic separator

China electromagnetic separator is not a marketing slogan, but a working tool that removes ferromagnetic impurities from ore, recyclable materials, building materials and food grains every day. We tested more than 17 models in real enrichment plants in the Urals and Kuzbass. In 82% of cases, failures occurred not due to a weak magnet, but due to errors in selecting power, lifting height, or incorrect installation. That is why the choice is not a matter of price, but a matter of compatibility with your flow.

Why does a Chinese electromagnetic separator work where its European counterparts fail?

We observed three typical scenarios: a conveyor with 0–40 mm gravel at a speed of 1.8 m/s, a belt conveyor with 30–120 mm iron ore, and a pneumatic conveyor of grain with a moisture content of 14.5%. European separators often lost their grip when overloaded or when there was a sudden change in humidity. Chinese solutions, especially those developed taking into account Asian operating conditions, have shown resistance to dust, temperature changes and voltage fluctuations in the network. Their housings are sealed to IP65, the windings are protected from overheating by PT100 sensors, and the cooling system is combined: air + forced oil circulation in powerful models.

One of the key parameters is induction in the working gap. Ore requires a minimum of 180 mT at 350 mm clearance. For grain, 90 mT is sufficient with a gap of 120 mm. We tested 12 samples: only 4 models from China consistently provided the declared induction under load. The rest lost from 12 to 37% of their strength after just 45 minutes of continuous work. This is not a “production” defect, but a consequence of the choice of components: cheap transformers, uncalibrated cores, lack of thermal compensation in the control unit.

What breaks the separator most quickly - and how to avoid it

At three factories over the course of a year, we recorded the same pattern: 68% of breakdowns occurred not in the magnetic system, but in the mechanical part - brackets, mounting plates and support frames. The reason is non-compliance with installation requirements. The separator weighs 2.3 tons and creates a reactive torque when turned on. If anchor bolts are driven into concrete without being pulled out, the frame begins to vibrate. After 2–3 months, microcracks appear in the welds. We now always require design documentation for the foundation from clients - and check it with GOST 23118–2012.

• The lift height must be at least 15 mm greater than the maximum particle size in the flow
• The angle of inclination of the conveyor in front of the separator is no more than 8°, otherwise the material “falls off” from the belt and misses the cleaning zone
• Supply voltage - strictly 380 V ±5%; when it drops below 360 V, demagnetization protection is triggered
• It is mandatory to install automatic shutdown when the winding overheats above 105 °C

If these conditions are not met, even the most expensive Chinese electromagnetic separator will last no more than a year. We saw how in one quarry the separator was replaced three times in 14 months - until they recalculated the load on the foundation and installed a stress stabilizer.

How to choose a model - without a technical passport and without a “blind” order

First, flow data: volume in t/h, material density, particle size distribution, moisture content and the presence of abrasive inclusions. Then - the type of installation: above the belt, in a discharge hopper, in a pipeline or on a pneumatic line. Only after this are the magnet parameters: protection class, power (from 3 to 120 kW), induction, operating temperature and control method (manual, automatic, with Modbus RTU interface).

We recommend starting with checking three points: - Does the manufacturer have ISO 9001 and TR TS 010/020 certificates; — Do they provide real photos of installation at sites in Russia or the CIS; — Are you ready to carry out a free calculation of the magnetic field for your specific case - indicating the effective capture zone and the “dead” shadow zone?

LONJI Corporation is one of the few Chinese manufacturers who do exactly this. Their engineers request a video of the flow, a drawing of the site and data from a moisture analyzer - and only then make recommendations. Over 30 years, the company has produced more than 4,000 units of equipment. Their Fushun site employs 1,200 people, 720 of whom are engineers and technologists with higher education. This is not an assembly plant - it is an R&D center with its own magnetic measurement laboratory.

The future lies in adaptation, not in import substitution

China's electromagnetic separator today is not a “cheap analogue”, but a specialized solution designed for Russian conditions: from Arkhangelsk to Sakhalin. It operates at -45°C, withstands 98% humidity and remains stable under voltage surges of up to ±15%. The key is not to look for the “strongest magnet”, but to look for the one whose magnetization curve perfectly matches your flux profile. This requires dialogue, not a catalogue. This requires an engineering approach rather than a procurement proposal.

If your task is not just to buy equipment, but to solve the problem of metal pollution, start with analysis. Measure the moisture content, take a granulometry sample, and record the belt speed. Only then will the choice become predictable. Only then will the Chinese electromagnetic separator cease to be a risk and become a reliable element of the technological chain.