China dry drum magnetic separator

The dry drum magnetic separator from China is not just a budget alternative. This is a technologically mature solution that has been tested in the mines of the Urals, processing plants in Kuzbass and processing lines in Kazakhstan. We have installed more than 120 of these separators over the past five years. In each case, the key requirement was stability: no stoppages in dust, no loss of holding power at +45°C, no loss of efficiency after three shifts in a row. It is these conditions that have revealed the weaknesses of many suppliers. Butdry drum magnetic separator chinafrom LONGI Corporation showed predictable performance - even when feeding gravel containing up to 8% iron dust.

Why “dry” is not a compromise, but a strategic choice

Many customers start with the question: “Why not wet?” The answer is simple: where water is not available - or it is not economically viable to supply it - dry separation becomes the only technically viable option. These are quarries in Central Asia, crushing and screening complexes in Siberia, scrap metal recyclers in Belarus. Under these conditions, water flushing causes freezing of pipes in winter, clogging of pumps, and additional costs for wastewater treatment.

The dry drum separator operates on the principle of a “magnetic barrier”: ferromagnetic particles adhere to the rotating surface of the drum, are carried away beyond the separation zone and are discharged into a separate tray. What is important is not the power of the magnet, but its distribution. For LONGI models (for example, LJG-1200×1500) the magnetic system is made of neodymium segments with a radial field orientation. Penetration depth - up to 120 mm at a belt speed of 1.2 m/s. This allows you to catch not only large bolts and washers, but also a fraction of 0.3–1.5 mm - for example, milling chips or oxidized ore dust.

Operating temperature range is from −25°C to +60°C. The body is made of reinforced carbon steel with powder coating. No exposed contacts, no transmission belts - just direct drive from an explosion-proof motor. This design eliminates unscheduled downtime due to belt breakage or bearing overheating.

What breaks separators - and how to avoid it

In practice, 70% of failures occur not due to magnets, but due to installation and operating errors. We recorded three typical scenarios:

• Insufficient feed chute angle— the material rolls down too quickly, without having time to “feel” the field. Optimum - 22–28° for dry sandstone;
• Clogged gap between drum and brush- especially when working with wet gravel. Solution: automatic blowing with compressed air every 4 hours (built-in mode in PLC control);
• Exceeding the permissible layer thickness— when feeding more than 45mm, efficiency drops by 35%. The adjustable slot height and inlet level sensor help here.

All these parameters are configured on site. Our engineers carry out commissioning and measure residual iron in the product using XRF analysis. Goal: no lower than 98.7% recovery at loads up to 120t/h.

Real numbers, not marketing promises

LONGI Corporation is not a trading platform, but a manufacturer with its own foundry, mechanical and magnetizing shops. The Fushun plant produces 4,000 units of equipment annually. Of the 1,200 employees, 750 are engineers and technicians. More than 200 models of dry drum separators have been certified according to GOST R ISO 9001 and have permission from Rostechnadzor.

The cost depends on the design: the basic version of LJG-900 costs from 2.1 million rubles, the full package with PLC, vibration sensors and remote monitoring costs from 3.4 million. Delivery time is from 45 days. Warranty - 24 months. But the main thing is not the price, but the payback period. For one client in Magnitogorsk it was 11 months: the separator prevented the failure of two crushers that had previously broken down due to metal ingress. Savings - 8.2 million rubles per year.

Choose not the country of production, but the working conditions

The Chinese dry drum magnetic separator is not “cheap China”, but modern equipment designed for real Russian conditions. It does not require constant operator control. Does not require water treatment. Does not create sludge waste. It can be installed in a container in a quarry, in a processing plant or directly on a conveyor belt in a cement plant.

If your task is to reliably remove ferromagnetic impurities from dry bulk materials without stops and downtime, contact the manufacturer directly. Technical specialists of Shenyang Scientific Electromagnetic Company LONJI LLC will help you select a model based on granulometry, humidity and flow volume. Prepare fastening drawings. Provide staff training. And they will answer questions - not through an intermediary, but from the plant in Fushun.