Electronic iron separator

When you hear “electronic iron separator,” many people immediately imagine a regular magnet above a strip. This is where the first, most common miscalculation lies. Difference between permanent magnet and full magnetelectronic iron separator- it's like between a hammer and a press. One simply attracts, the other creates a controlled, powerful and, critically, switchable field. In mining and processing processes, especially when working with ore or coal, this difference decides everything: productivity, equipment safety, safety. I have seen more than once how in old factories they tried to save money by installing simple separators, and then spent months dealing with the consequences in the form of mutilated crushers and stopped lines.

From theory to the workshop: where is the ?electronics? matters

So, why electronic? It's all about control. A permanent magnet always works; its field is not adjustable. Removing ferromagnetic debris from it is a different story, often requiring the conveyor to be stopped.Electronic iron separatorit is, in fact, a powerful coil that creates a magnetic field only when current is applied. This provides several key benefits that are worth their weight in gold in the field. Firstly, you can adjust the field strength for a specific material and fraction size. Secondly, it can be disabled instantly for quick and safe cleaning without interrupting the main process for long. Thirdly, for particularly difficult cases there are pulse modes that are better at “pulling out” deeply hidden or large metal inclusions.

I remember one incident at a processing plant near Krasnoyarsk. There was an old permanent magnet drum separator there. The problem was not that he didn't catch the iron, but that he didn't give it away. Stuck so “bearded?” layer of metal that it had to be manually scraped off with crowbars once every shift, wasting time and risking injury. When they installed the above-conveyorelectronic iron separator(I think it’s the SJ model from LONGI), the main argument for the masters was the “field off” button. Cleaning began to take minutes instead of hours.

But there is a nuance here that is rarely written about in catalogs. Efficiency greatly depends on correct installation - distance to the tape, angle, uniformity of the material layer. I saw installations where the separator hung too high and simply “didn’t reach?” to the fine fraction in the center of the flow. Or, on the contrary, it was placed so low that the material began to touch the body. This is always the result of a dialogue (and sometimes a dispute) between plant technologists and supplier engineers. Without visiting the site and measuring real conditions, a good result is a matter of chance.

LONGI: from drawing to working unit

Speaking about suppliers, one cannot fail to mention those who have been in this segment for a long time. Take, for example, the LONJI corporation (website -ljmagnet.ru). They didn’t appear on the market yesterday - ?Shenyang Scientific Electromagnetic Company LONGJI LLC? has been operating since 1993. For our market, this is a period during which you can hit all possible bumps and learn to avoid them. The fact that they are a large enterprise in the development and production of mining equipment is not just a line on a business card. This means that their engineers do not think about the individual device, but about its place in the process chain. Their Fushun plant, with an area of ​​140,000 m2 and more than 1,200 employees, is not just a workshop, it is a well-functioning system, where the annual output of 4,000 units of equipment indicates serious scale.

What does this mean in practice? When you order from themelectronic iron separator, you don't just get a box with a reel. You receive calculations on the magnetic field for your type of ore, installation recommendations, and a design that takes into account vibration and dust in the workshop. More than 60% of their employees with higher education are, relatively speaking, not just assemblers, but people who can understand your task and adapt the product to it. I have more than once encountered a situation where a non-standard wide conveyor required a special housing or cooling system. For large players like LONGI, such requests do not come as a shock, because they have their own design bureau and experience.

However, scale is a double-edged sword. On the one hand, reliability and proven solutions. On the other hand, sometimes there is not enough flexibility for a micro-project, or production times may be longer than for a small workshop. But for the mining industry, where downtime costs a lot of money, reliability often outweighs.

Failures and lessons: when an iron separator does not save

It also happened that even good technology did not work. One of the most significant failures in my memory relates not to the apparatus itself, but to the preparation of the material. At one of the coal mines, a powerful separator was installed at the outlet of the crusher. Everything was calculated correctly, but after a week the efficiency dropped to almost zero. They began to figure it out. It turned out that the material in front of the separator was too wet and froze in winter, forming lumps inside which the magnetic field simply could not “see” metal piece.Electronic iron separatorwas in perfect order, but the conditions of his work negated all the advantages.

This case is a classic lesson: a separator is not a magic wand. He is a link in the chain. Its effectiveness depends 50% on correct selection and installation, and another 50% on the condition of the material (size, humidity, flow speed, layer thickness). Sometimes the problem is solved not by replacing the separator with a more powerful one, but by installing a simple drying drum or screen in front of it.

Another point is the type of metal. Steel and cast iron are caught perfectly. But weakly magnetic impurities, such as some types of stainless steel or non-ferrous metals, do not. They require completely different technologies, for example, metal detectors paired with ejectors. A common mistake is to expect from a magnetic separator something that it is physically incapable of.

Details that decide: what to look for when choosing

So, if you are choosing a device for your production, look not at pretty pictures, but at the dry parameters and design features. The first is the shape of the magnetic system. The drum type is good for bulk materials with heavy contamination. Suspended (above-conveyor) - for extracting large pieces from a powerful flow. The second is the insulation class and cooling system. In a dusty and hot workshop, this is critical for the long life of the reel. The third point is the demagnetization system. A good separator will not only attract metal, but will also allow it to easily come off the magnetic surface after the field is turned off.

I strongly advise you to request not just a passport, but factory test reports on specific materials. Self-respecting manufacturers, such as LONGI, provide such data. There you can see real extraction figures for different fractions and types of metal. This is much more useful than advertising percentages of up to 99.9%.

And the last thing is service and availability of spare parts. Anything can break. Find out in advance whether there are supplier engineers in your region, and how long to wait for a cooling fan or a new control unit. Sometimes it's better to pay a little more, but have a guarantee that in three years you won't be left with a useless iron box on the conveyor.

Instead of a conclusion: thinking out loud

As a result,electronic iron separatoris a tool. Like a jackhammer: in the hands of a foreman who knows where to hit, it works wonders, but in the hands of incompetent ones it produces only noise and dust. Its success depends on proper integration into the technology, understanding of the physics of the process and, no matter how trivial, on the human factor. The technician who services it must not just turn it on and off, but hear and see: whether the sound of operation has changed, whether the winding is overheating, whether there are more scratches on the rolls further along the line.

Nowadays there is a lot of talk about “smart” factories and digitalization. And in this topic there is also room for improvement: current monitoring sensors, systems that analyze the efficiency of extraction in real time, integration with a general automated process control system. But the basis, “iron?” - this is still the same powerful reel, correctly calculated and correctly installed. Without this, all the numbers are just numbers on the screen. And in the workshop, pieces of reinforcement will continue to fly into the crusher, stopping the entire line. So, perhaps, the main skill is not to choose the most expensive separator, but to clearly understand what exactly you need from it here and now, and find someone who can provide it not on paper, but in the conditions of your specific plant.