Cheap Magnetic Gravity Separator

A cheap magnetic-gravity separator is not a marketing gimmick, but a real tool for processors, where every thousand rubles in capital costs affects the profitability of the quarter. We saw how at two plants in the Kemerovo region, replacing outdated drum magnets with compact magnetic-gravity separators reduced downtime by 37% and reduced maintenance costs by 2.4 times. The main thing is that “cheap” does not mean “weak” here. This is the result of optimization of the design, rejection of redundant automation and accurate calculation of the magnetic field for a specific fraction.

Why “cheap” works - without loss of efficiency

Many buyers mistakenly believe: low price = low induction or poor resistance to abrasive wear. In practice, everything is different. In the LONGI Corporation line, models such as LJ-GMS-800 and LJ-GMS-1200 passed 18-month tests at the processing plants of the Urals. Their key advantages:

• Gradient magnetic field up to 1.8 Tesla— achieved through a combination of N52 neodymium magnets and ferromagnetic pole pieces, and not through bulky electromagnets;
• The angle of inclination of the working surface is manually adjustable from 5° to 22°— this allows you to quickly adapt the separator to the humidity, size and density of the material (for example, when switching from brown coal to ferruginous quartzites);
• No moving parts in separation zone- only gravitational drain and magnetic trap. The average service life of the main module is 12 years without replacing magnets;
• Weight - from 38 to 92 kg, and not from 300 kg, like analogues with electric drive. Installation is possible without a crane, on a standard frame made of channel No. 10.

A client from the Rostov region ordered an LJ-GMS-1000 for cleaning recycled sand after crushing construction waste. Three weeks later, he reported: “The separator caught 94% of ferromagnetic inclusions as small as 0.3 mm - even the worm nails that previously passed through the vibrating sieve. At the same time, energy consumption is zero. Only a lifting mechanism for loading.”

When “cheap” turns into a loss - typical mistakes

One of the most frequent requests to LONGI technical support is: “Why doesn’t the separator remove all the glands?” In 7 out of 10 cases, the reason is not the equipment, but a violation of operating conditions. Here are three critical points:

1. Feed rate is higher than 1.2 t/h for model LJ-GMS-800. When overloaded, the material “washes away” small particles from the magnetic surface. The real solution is not to increase the power, but to add a pre-dispersion of 8–10 mm;
2. Humidity over 12%. Moisture creates a film that screens magnetic interaction. What helps here is not a “stronger magnet”, but pre-drying - even a simple air shower at +60 °C increases the yield of pure product by 22%;
3. Lack of regular cleaning of the magnetic plate. Once per shift is a mandatory procedure. We supply special scrapers made of UHMW-PE polymer that do not scratch the coating and do not require lubrication.

If your task is to clean crushed stone, recyclable materials, coal, mineral powder or construction sand, and the budget is limited, but the requirements for cleanliness are strict, the “cheap magnetic-gravity separator” from LONGI solves exactly this dilemma. It does not replace electromagnetic installations in complex multicomponent mixtures, but in 85% of typical cases it works more reliably and cheaper.

How to choose a model - without overpayment and oversights

The choice begins not with price, but with three parameters:

• Maximum inlet particle size— if there are pieces >25 mm, you need a model with a reinforced guide plate (LJ-GMS-1200 or LJ-GMS-1500);
• Bulk density of material— for light fractions (ash, wood shavings) LJ-GMS-600 is enough; for ore or crushed granite - only LJ-GMS-1200 and higher;
• Installation type— on a conveyor (with flange mounting), in a free-fall flow (with a support stand) or in a hopper design (with an adjustable tray).

An online selection calculator is available on the website ljmagnet.ru: enter the fraction, humidity, productivity - the system offers 2-3 suitable options with a payback calculation. The average payback period for a “cheap magnetic-gravity separator” is 5–8 months due to a reduction in scrap and savings on crusher repairs.

LONGI Corporation has been producing such separators since 1993. During this time, their design has gone through 11 iterations - from the first samples with ceramic magnets to modern models with corrosion protection according to the ISO 12944 C5-M standard. Today, a “cheap magnetic-gravity separator” is not a compromise. This is a technologically proven choice for those who value predictability, simplicity and real savings. And not just a number in the estimate.