China eddy current separator

China eddy current separator is not a marketing phrase, but a working tool that we see every day at processing plants from Krasnoyarsk to Bashkortostan. Over the past five years, we have tested 17 models of such installations: from compact modules for laboratories to industrial lines with a capacity of 30 t/h. Most failures were not due to a weak magnet - but due to a lack of understanding of how the eddy current effect interacts with a real bulk mixture. That is why “China eddy current separator” today is not about the country of origin, but about the correct choice of parameters for your material, and not for the catalog. How an eddy current separator works - and why 60% of orders require modification An eddy current separator separates non-ferrous metals (aluminium, copper, zinc, brass) from non-magnetic impurities due to an electromagnetic pulse. When a conducting particle enters an alternating magnetic field, eddy currents arise in it. They create a secondary field that repels the particle from the source and throws it into a separate bunker. But the key point: this effect depends not only on the material, but also on the shape, size, feed speed and even humidity. We observed three typical failure scenarios: The client purchased a plant with a stated productivity of 15 t/h - but when feeding crushed aluminum scrap with paint and plastic residues, the efficiency dropped by 40%. The reason is that a dirty surface reduces conductivity, and therefore the repulsive force. At one plant, a separator was used to sort cable shavings. The result is a high copper yield, but with 8–12% copper foil inclusions. It turned out that thin foil fragments do not generate sufficient eddy current - there are simply not enough of them in the field. The third case: the separator worked perfectly on dry aluminum, but when the humidity increased above 8%, it began to “let” particles through. Water creates a surface film that disrupts contact with the field. The conclusion is simple: an eddy current separator is not a universal “vacuum cleaner for metals.” It requires preliminary trial sorting of samples. We do this for free - with measurement of electrical resistivity, analysis of granular composition and modeling of particle trajectories. What distinguishes a reliable Chinese eddy current separator from a “budget” analogue The difference is not in price - in control over four parameters: frequency of field generation, penetration depth, conveyor speed and deflection angle. Reliable settings allow each of these values ​​to be adjusted manually or via a PLC interface. Cheap ones - they fix everything “at the factory” and give only one “high/low performance” switch. Specific numbers tested in practice: The optimal frequency for aluminum is 25–35 kHz. For copper - 15–22 kHz. Installations without frequency tuning lose up to 27% of the purity of the output. The field penetration depth must be at least 12 mm under load - otherwise particles below this level will not “see” the field. The belt speed is 1.2–2.4 m/s - the range in which the particle has time to “react”, but does not fly out of the separation zone. Another important point is cooling. The eddy current coils become hot. Inexpensive systems use air cooling with thermal protection. In professional ones - forced oil circulation with real-time temperature sensors. We saw how the installation showed 99.2% purity in the first two days of operation, and by the end of the week - 93.7% due to overheating of the coils and drift of parameters. Implementation practice: from design to commissioning Installation of China eddy current separator - not “plug and play”. Precise integration into the existing line is required. We always start with three steps:Input Stream Analysis: we take at least 5 samples of 5 kg each, measure the content of non-ferrous metals, humidity, the presence of films and oxides.Configuration selection: select the type of belt (rubber, polyurethane), angle of inclination, width of the working area and method of waste removal - depending on the location.Checking power consumption: A standard installation consumes between 12 and 28 kW. If there is no power reserve at the site, we offer solutions with reduced peak load or energy recovery. The average installation time is 3–5 days. Commissioning includes not only setting parameters, but also training the operator: how to recognize the first signs of field degradation, how to adjust the speed when the composition of raw materials changes, when it is necessary to clean the coils from dust. LONJI Corporation: experience, not a catalog Shenyang Scientific Electromagnetic Company LONJI LLC has been operating since 1993. The production site in Fushun produces more than 4,000 pieces of equipment per year. But something else is more important for us: 60% of engineers have specialized higher education, and each project goes through a three-level check - from calculating the magnetic field to modeling the movement of particles in the EDEM software package. We do not sell “China eddy current separator” as a product. We sell a solution with a guarantee of yield purity of at least 98.5% for aluminum and 99.1% for copper, subject to operating conditions. All technical data, connection diagrams, service instructions and videos from real launches are available on the websiteljmagnet.ruThe future of separation lies not in stronger magnets, but in smarter field control. The next generation of installations is already being tested: with an adaptive frequency that adjusts to the flow composition in real time. The first results are +14% yield of pure metal at the same productivity. This is not a forecast. This is what already works - and what we are ready to show you on your site.