China magnetic separator for non-ferromagnetic materials

A Chinese magnetic separator for non-ferromagnetic materials is not a paradox, but a technological solution tested at dozens of Russian enterprises. We encountered this request for the first time in 2019: a client from the Kemerovo region sent samples of quartz sand with an admixture of pyrite and hematite - weakly magnetic minerals, but critically harmful to the final product. Standard ferromagnetic separators did not catch them. Then we tested three types of equipment - and only one type, based on the principle of high-gradient magnetic separation (HGMS), gave stable purification up to 98.7%.

Why “non-ferromagnetic” is not a death sentence for magnetic separation

Many engineers automatically discard magnetic solutions when working with titanium ores, zirconium, quartz or recycled glass. Error. Non-ferromagnetic materials come in three groups: diamagnetic (water, quartz), paramagnetic (hematite, ilmenite, pyrite) and weakly ferromagnetic (some manganese oxides). Only the first group is truly “invisible” to the magnet. The second and third are removed, but require two conditions: high field strength and a sharp gradient. This is exactly what is implemented in modern Chinese magnetic separators for non-ferromagnetic materials - not through powerful permanent magnets, but through electromagnetic systems with iron matrices and cooling.

In practice, this means: - working field up to 20,000 Gauss (2 T) with a gradient of over 500 T/m; — field strength adjustment in real time — from 3000 to 20000 Gauss; — temperature control of windings — critical during long-term operation on lines with high productivity; — modular design: you can replace only the matrix or power supply without stopping the entire section.

What breaks separators - and how to avoid it

We analyzed 42 equipment failures over the past three years. 68% of cases are associated not with the quality of the magnets, but with operating errors: flow overload, ingress of large foreign inclusions, lack of pre-drying of the material. Paramagnetic particles of wet quartz stick to the matrix, clog the cells, and cause local overheating. The result is a decrease in efficiency after just 8 hours of continuous operation.

The solution is simple, but often ignored: - mandatory preliminary classification - fractions over 3 mm are removed mechanically; — humidity of the input material is not higher than 8% (for dry separators); — installation of a vibrating feeder with adjustable amplitude in front of the separator - this guarantees a uniform layer and eliminates “clogging”;

Another common mistake is choosing a model based on productivity in t/h without taking into account density and magnetic susceptibility. For example, a separator designed for 15 t/h of quartz will produce only 7 t/h when working with ilmenite-containing slag dust. We always ask clients not just “how many tons per hour”, but laboratory analysis data - magnetic susceptibility in cm³/g, distribution by fractions, Fe₂O₃ and TiO₂ content. Without this, selection becomes guesswork.

How reliability works at the production level

Reliability begins not in the workshop, but in the design bureau. Shenyang Scientific Electromagnetic Company LONJI LLC, founded in 1993, relies on three components: - in-house production of double epoxy impregnated copper windings with heat resistance up to 220 °C; — domestic iron matrices made of Fe–Si alloy with control of the gap between the plates ±0.02 mm; — water cooling system with pressure and temperature sensors on each circuit.

The LONJI plant in Fushun occupies 140,000 m², produces 4,000 units of equipment per year, more than 60% of engineers have higher technical education. This does not allow them to “assemble to order” - they have 12 basic models of VGMS separators, each with clearly defined parameters: field adjustment range, maximum productivity for quartz/hematite/slag, permissible humidity, power requirements. On the websiteljmagnet.runot just catalogs are available, but interactive comparison tables - indicating, for example, that the LJM-HGMS-1200 model at 12000 Gas provides 92% extraction of pyrite from coal, but at 18000 Gas - already 99.1%, while energy consumption increases by 37%.

Choice is not about price, but about compatibility

A Chinese magnetic separator for non-ferromagnetic materials pays off not due to its low cost, but due to its exact compliance with the task. The most expensive machine is useless if it doesn't solve your specific problem: removing 0.3% hematite from optical quartz requires different settings than cleaning zirconium concentrate from ilmenite. We recommend that you start not by requesting a quote, but by sending a trial sample - free of charge. Within 5 working days you will receive a test report: recovery percentage, residual content, recommended flow rate and field strength.

This saves time, budget and nerves. Because real reliability is not about the equipment not breaking down. The point is that it works exactly as it should - day after day, year after year, without compromise in the quality of the final product.