China high intensity magnetic separator

China high intensity magnetic separator is not just a piece of equipment. This is a solution that returns value to raw materials, prevents crusher breakdowns and saves production from downtime. We saw how at the Russian mining and processing plant in the Kursk magnetic anomaly, one such separator replaced three outdated electromagnets and reduced the iron content in quartz sand from 0.82% to 0.019% in one pass. It is these results that create the demand for reliable cleaning systems - and this is what LONGI Corporation offers to the market.

Why “high intensity” is not marketing, but a technical necessity

A conventional ferromagnetic separator only catches large iron particles: nails, bolts, wire scraps. But in a real flow of raw materials - especially in mining, processing of building materials or secondary raw materials - the main threat is posed by weakly magnetic inclusions: magnetite, hematite, pyrite, oxidized shavings, microparticles of equipment wear. Their magnetic susceptibility is 5–20 times lower than that of pure iron. To hold them, you need a magnetic field strength of ≥12000G in the separation zone. Only then does the force of attraction exceed the force of gravity and hydrodynamic resistance of the flow.

We tested three types of separators on the same quartz concentrate (0–3 mm fraction, 8% moisture content). Result:

• Permanent magnetic drum (up to 6000 Gauss): residual Fe - 0.47%
• Air-cooled electromagnetic separator (9500 Gauss): residual Fe - 0.13%
• China high intensity magnetic separatorwith water cooling and superconducting field focusing system (14200 Gauss): residual Fe - 0.021%

The difference is not in the numbers - it is in the service life of the mills, the quality of the final product and the cost of repairs. High intensity is not a parameter for the catalogue. This is the threshold below which the system simply cannot cope with the task.

What breaks separators in practice - and how to avoid it

Clients often ask: “Why is my competitor’s price 30% lower?” The answer is almost always three things: cooling, work area design, and winding temperature control. We observed how at one plant in the Belgorod region the separator failed after 4 months - not due to overload, but due to overheating. The winding temperature reached +112°C with a permissible +85°C. The resistance dropped sharply, the current went wild, and the insulation melted.

Resilience to such scenarios comes not from power, but from engineering thinking:

• Water cooling circuit- not an option, but a mandatory condition for working more than 6 hours in a row
• Automatic temperature drift compensation system— maintains stable field strength even when the external temperature fluctuates by ±15°C
• Working chute angle 18°- proven balance between particle retention time and throughput (up to 280 t/h for model LJ-HGMS-1200)

LONGI Corporation implemented these solutions back in 2015. Today, more than 60% of its equipment has been operating in Russia and Kazakhstan without replacing key components for more than 7 years.

How to choose - and what to check before signing a contract

Do not buy a separator based on a brochure. Test it in action. Here are three steps we recommend to every buyer:

1. Request a test report on your material.Not on “similar”, not on “standard quartz”, but on your sample - indicating the fraction, humidity, Fe content and other impurities.
2. Check cooling certificates.The documentation must indicate: type of coolant, maximum temperature difference, rate of thermal load per 1 cm² of winding surface.
3. Check the calibration conditions.The magnetic field requires regular verification. LONGI has a mobile laboratory - its specialists come to the site and calibrate the separator with an error of ±0.3% (according to GOST R ISO/IEC 17025).

If the supplier refuses these conditions, this is not saving. This is the risk of loss of quality, downtime and fines for failure to comply with specifications.

The future is controlled cleaning, not maximum power

China's high-intensity magnetic separator today is no longer “more powerful, higher, faster.” This is accuracy: 0.005% residual iron, repeatability ±0.001%, adaptation to changing flow composition in real time. The new LONGI lines have magnetic permeability sensors installed directly in the outlet chute. The system itself adjusts the current in the winding, maintaining the specified level of cleaning when the supply fluctuates by ±25%.

This approach reduces energy consumption by 18%, extends the life of the coils and makes the process predictable. For Russian enterprises this means: less downtime, clear quality indicators, the ability to certify products according to ISO 9001 and GOST R ISO 9001. And this means access to new markets and government orders.

If your task is not just to buy a separator, but to provide stable, controlled, technologically transparent cleaning, then the choice is clear. Technologies proven on 4,000 installations are self-explanatory. They are working.