China Magnetic Gravity Separator

China magnetic gravity separator is not just another type of processing equipment. This is a solution that we have seen in action at three mines over the past 18 months: in the Kemerovo region, in the Urals and in Transbaikalia. Where traditional gravity tables yielded 62–65% iron recovery from weakly magnetic quartzites, the Chinese magnetic gravity separator raised the figure to 79.3%. Not due to “magic” technology - but due to the precise balance of magnetic force, the angle of inclination of the working surface and the speed of pulp flow.

Why exactly the magnetic-gravitational principle works where individual methods fail

We often hear: “Do we need another separator? We already have magnetic drums and spiral classifiers.” The answer depends on one thing - the composition of the ore. If the charge contains particles of 0.045–0.3 mm containing both magnetite and hematite or limonite, not a single purely magnetic or purely gravitational device will cope without losses. The magnetic drum will allow weakly magnetic inclusions to pass through. A gravity machine will not hold small, dense grains in the flow.

China magnetic gravity separator solves this problem at the same time. It creates a combined field: a constant magnetic field with a strength of 0.8–1.6 Tesla (depending on the modification) and a controlled gravitational slope of up to 12°. The particles “feel” both impacts. Magnetic - stick to the surface and move up the inclined zone. Weakly magnetic - they are held by hydrodynamic resistance and their own inertia until they settle in the receiving chute. Important: this is not “mixing two technologies”, but their synchronization at the level of control of the feed speed, distributor speed and water level.

In practice this means:

• Reduction of iron losses in tailings by 14–22% compared to gravity tables;
• Reducing energy consumption per ton of processed ore - by an average of 37% compared to electromagnetic separators of similar performance;
• Possibility of working without preliminary dehydration - permissible pulp moisture content is up to 35%.

What technical data sheets hide - and why it is important to check not only numbers

One customer from the Krasnoyarsk Territory received a separator with a declared productivity of 120 t/h. In fact - 83 t/h with a solid content above 28%. Cause? The passport indicated data for pulp with 22% solid phases and a temperature of +15 °C. In reality - 31% and +4 °C in winter. The difference in viscosity and magnetic permeability has become critical.

Therefore, when choosing a Chinese magnetic-gravity separator, pay attention not to the maximum in the catalog, but to three parameters:

1. Working range of pulp moisture— for reliable models it is 18–35%, and not “up to 35%”;
2. Type of magnetic system— not just a “permanent magnet,” but specifically neodymium-boron-iron (NdFeB) with protection against demagnetization when heated above +80 °C;
3. Distributor design- must be adjustable in height and angle, with the ability to quickly replace worn elements without complete disassembly.

These are the solutions that LONGI Corporation uses. Its equipment is designed taking into account Russian conditions: from temperature changes to dust levels in the air in the workshops. We personally checked - at the plant in Fushun (Liaoning Province) we tested separators at -35 °C in a climate chamber and at a humidity of 95%.

How to avoid mistakes during implementation - from the experience of five Russian projects

The first mistake is installation without preliminary analysis of the particle size distribution. The separator is effective in the range of 0.03–1.2 mm. Particles larger than 1.5 mm require crushing; particles smaller than 0.02 mm require preliminary coagulation. Without this, the cracks become clogged and extraction decreases.

The second is ignoring water requirements. Hardness above 7 mmol/l causes salt deposition on magnetic surfaces. The solution is simple: install a fine filter before feeding it into the irrigation system.

The third is the lack of backup power. Even a short-term power failure leads to a reset of the magnetic field and the loss of all material in the work area. Minimum - UPS for 15 minutes of operation.

LONGI Corporation includes these items in its technical support. On the websiteljmagnet.runot only drawings and instructions are available, but also videos with analysis of typical emergency situations - with an emphasis on what to do *in the first 90 seconds* after a power outage.

China magnetic-gravity separator is not a replacement, but a growth point

This is not a universal “magic box”. It is a tool for a specific purpose: increasing recovery from difficult, mixed, fine-grained ores where traditional methods have exhausted their potential. Its strength lies in predictability, repeatability of the result, and the ability to scale without loss of quality.

Over the 30 years of operation, Shenyang Longji Scientific Electromagnetic Co., Ltd. has produced more than 120,000 units of equipment. But something else is more important: 78% of its clients in Russia return for the second and third separator - not because “it wasn’t enough,” but because the first one paid for itself in 11 months and allowed them to launch a new tailings processing line.

China magnetic-gravity separator is not about “cheaper”. This is about “more precisely.” About ensuring that every ton of ore works for results, and not to compensate for losses.