Leading High Frequency Dry Drum Magnetic Separator

High frequency dry drum magnetic separator is not just a piece of equipment. It is the intersection of physics, engineering practice and industrial economics. We installed such systems at processing plants in Kuzbass, tested them at −32°C in Yakutia and observed how they displace wet separators even in open pits with high ore moisture. The main thing is not the frequency in hertz, but the stability of the separation under real loads. That's whyleading high frequency dry drum magnetic separatorremains in demand where other solutions fail.

Why “high frequency” is not marketing, but a physical necessity

The rotational speed of the drum directly affects the force of the centrifugal ejection and the time the material remains in the magnetic field. At 120–180 rpm, weakly magnetic inclusions (magnetite, hematite with low magnetization) simply do not have time to be fixed on the surface of the drum. Our measurements show: increasing the frequency to 240–320 rpm increases the concentrate yield by 18–22% while maintaining purity up to 96.7%. But there is a condition - the magnetic system must compensate for dynamic losses. For standard solutions, the field is weakened by 35% at such speeds. The leading high frequency dry drum magnetic separator uses a combination system: permanent neodymium magnets in the capture zone and pulsed electromagnets in the discharge zone. This makes it possible to maintain an induction of 0.85–1.1 Tesla even at the maximum frequency.

Dry cleaning is not a simplification, but a calculation for fault tolerance

Wet separators require water treatment, pumping stations, settling tanks and slurry pumps. One emergency tap or clogged filter - and the whole process stops. Dry technology eliminates these points of failure. However, it places strict demands on the fraction size and feed uniformity. We have seen customers try to run the separator with material larger than 10 mm - the result is that the feed hopper slot gets clogged and the drive overheats. The operating range of the leading high-frequency dry drum magnetic separator is from 0.1 to 8 mm. In this case, the permissible humidity coefficient does not exceed 7%. If the humidity is higher, preliminary drying or installation of a ventilation module with air heating is necessary.

How to avoid three common mistakes when choosing

• Mistake #1:Compare by engine power. A 15 kW motor may be excessive for light fractions and insufficient for dense quartz sand. It is not the power that is critical, but the torque on the drum shaft - at least 420 Nm for stable operation at a load of 30–45 t/h.
• Mistake #2:Ignore the drum angle. The standard 5° only works with perfect uniformity. In practice, an adjustment of 3° to 9° is required. The leading high-frequency dry drum magnetic separator has real-time hydraulic angle correction.
• Mistake #3:Do not take into account the wear resistance of the coating. Ordinary steel wears out in 6 months when working with abrasive rocks. The solution is a multi-layer coating of tungsten carbide and nickel alloy. The resource increases to 36 months.

LONGI Corporation: an experience that cannot be imitated

Shenyang Scientific Electromagnetic Company LONJI LLC has been creating equipment since 1993. Over 31 years, we have collected a database of 2,700+ cases - from iron ore quarries in Kazakhstan to the processing of secondary aluminum in Germany. The production site in Fushun (140,000 m²) produces 4,000 units of equipment annually. More than 60% of engineers have specialized higher education and experience working at mining and processing plants. This means: each technical passport is not an abstraction, but the result of tests under specific conditions. For example, the LJ-DFM-320 model passed a 14-month life test at the Yuzhkuzbassugol processing plant - without replacing bearings, without repairing the magnetic system, with a productivity deviation of ±1.3%.

The leading high frequency dry drum magnetic separator is not a universal tool. It is effective where speed, reliability and minimal operating costs are important. Its task is not to replace all other methods, but to become a decisive link in the chain of raw material preparation. To make a decision, it is enough to answer three questions: what is the fraction of your ore, what is the percentage of moisture in the feed, and how many hours a day should the separator operate without stopping for maintenance. The answers will not determine the brand, but the physical capability. Detailed technical specifications, connection diagrams and integration recommendations are available on the websiteljmagnet.ru.