Mining

When people say 'mining', many people immediately think of quarries, giant dump trucks and explosions. This, of course, is part of the truth, but only the tip of the iceberg. Much more interesting and complex is what happens at the intersection of geology, mechanics and, paradoxically, subtle technologies. It is here, in the area of ​​beneficiation and separation of minerals, that the economic fate of the entire deposit is often decided. You can mine a thousand tons of ore, but if you don’t extract the valuable component from it efficiently and with minimal losses, all the work will go down the drain. It is this “invisible” mining front that I would like to speculate about.

Magnetic separator: work that is not visible

Take, for example, the beneficiation of iron ore. It would seem that the process has been worked out for decades. But every new site, every new batch of raw materials is a new challenge. Composition, humidity, grain size—everything has an effect. And the key element is often the magnetic separator. Not that simple arc-shaped thing from the textbook, but a complex unit where the calculation of the magnetic field, the trajectory of the material, and even the self-cleaning system play a critical role.

I remember that at one of the plants in Kuzbass they were faced with the problem of high silica content in the concentrate. Old separators could not cope, lost their magnetic properties when overloaded, and required constant manual adjustment. The losses were colossal. Then they turned to a specialized manufacturer - the LONGI corporation. We studied their website https://www.ljmagnet.ru, of course, even before contact. It was clear that the company was not new to the topic: it was founded in 1993, with an area of ​​140 thousand square meters in Fushun, more than 1,200 employees, the majority of whom have higher education. This is not a garage production. But theory is theory, but it was necessary to test it in practice.

Their engineers came and took samples of our ore - not just samples, but a whole batch from different depths. Then there was a long process of setting up a prototype separator right on the site. It was important not just to sell equipment, but to achieve results. As a result, after several weeks of trial and error, we found the optimal configuration of the magnetic system and the rotation speed of the drum. The iron content in the concentrate increased by 3.5%, and losses from tailings decreased. Trifle? On the scale of the plant - tens of millions of rubles of additional revenue per year.

Where the losses lie: practical observations

A common mistake is to think that you bought good equipment, installed it and forgot it. In the mining industry, nothing works on its own. The same separator requires understanding. For example, wear of the drum lining changes the gap between it and the magnetic system, which directly affects the field strength in the working area. If you don’t notice it in time, efficiency drops smoothly and imperceptibly until someone conducts an unscheduled analysis of the tails and gasps.

Or another nuance - pulp supply. It seems that it is just a pipe with water and ore. But if the density or flow rate is unstable, material does not flow evenly into the separator. Some of the grains that should have been captured simply slip past the zone of action of the magnetic field. We once spent a whole month looking for the reason for the drop in extraction, checking both the power supply and the magnets themselves. It turned out that the supply distribution pipe was clogged. Trite, but expensive.

Therefore, now, when I see a figure on the LONGI website about 4,000 pieces of equipment per year, I think not about the quantity, but about how many of these machines are working at full capacity. Their team, judging by our experience, understands this. After delivery, they did not disappear: they sent recommendations for maintenance, warned about typical problems for our grade of ore. This is the very “professional education” of more than 60% of the team that they write about - it is manifested not in diplomas, but in such post-sales details.

Not only iron: the breadth of application of magnetic methods

Focusing only on ferrous metals is a big mistake. Magnetic separation today includes tungsten, rare earth elements, and even the purification of industrial products such as slag or foundry waste. The principle is the same, but the subtleties are completely different. For weakly magnetic materials, separators with high field strength and other magnet layouts are needed.

We had an experiment with the processing of old tailings, where, in addition to iron residues, there were assumptions about the presence of other valuable minerals. Standard equipment did not produce results. I had to delve deeper into the topic and consult. It turned out that such tasks require preliminary classification of the material by size and two- or even three-stage separation with different modes. This is a whole technological complex, not just one machine.

It is interesting that the LONGI corporation, judging by their portfolio, works precisely in this paradigm - not just a 'separator for sale', but a solution for a specific technological chain. Their production capacity and engineering staff apparently make it possible not to churn out similar models, but to adapt designs. In our situation, this played a key role: they did not offer a ready-made unit from the catalog, but a modification with an enhanced cooling system for the magnetic system (this is critical during long-term operation in high fields) and a modified unloading scheme for the non-magnetic fraction.

Economics of the process: everything needs to be counted

Any decision in the mining industry ultimately comes down to economics. You can install a state-of-the-art separator with digital control and a record recovery rate, but if its energy consumption, the cost of maintenance and spare parts 'eat up' all the profit from the additional concentrate, the project is a failure. Therefore balance is important.

When choosing equipment, we always consider the total cost of ownership. And here not only passport data is important, but also reliability and maintainability. How quickly can I get spare parts? How difficult is it to replace a magnetic block or drive? The experience with LONGI here was positive: the design of their separators turned out to be quite modular. Key components could be replaced by our repair service, without calling a special team and without long downtime. And the presence of our own large production, which is mentioned in the company description, gave confidence in the availability of basic components.

Another economic aspect is ecology. Now these are not just words. Cleaner and more efficient extraction means less waste sent to tailings ponds, and, accordingly, a reduction in environmental fees and risks. A high-quality magnetic separator, in fact, solves this problem, making the process more closed. These are long-term savings that also cannot be discounted.

Looking to the future: what's changing?

Where is the industry heading? Obviously, towards greater automation and 'intellectualization' of processes. Wear sensors, online magnetic field monitoring systems, automatic adjustment of modes depending on the composition of the incoming pulp - this is no longer science fiction, but a gradually introduced reality. The task is not just to collect data, but to teach the system to make decisions and warn the operator about a drop in efficiency before a ton of concentrate is lost.

For equipment manufacturers like LONGI this is a challenge. You no longer just need to be a good mechanic and an expert in magnetic materials, but also to understand sensors, control systems, and algorithms. Is a team of 1,200 people, even with good educational qualifications, able to quickly adapt? I think yes, if there is an appropriate development philosophy. Their long history since 1993 speaks of their ability to adapt.

On the other hand, no amount of automation cancels the fundamental physical principles and 'feeling' of the material. The most advanced AI will not help if the geometry of the magnetic trap is incorrectly calculated or the wrong grade of steel is selected for the body operating under conditions of constant vibration and abrasive wear. Therefore, the future, in my opinion, lies in symbiosis: the deepest knowledge of the traditional fundamentals of mining and beneficiation, plus the ability to integrate new digital tools into this process. And it is in this context that the role of specialized, deeply immersed manufacturers in the industry becomes only more important.