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Loesche

Name: Loesche
Address: Hansaallee 243, Düsseldorf, 40549, DE
Telephone: +4921153530

Engineering solutions for the design, installation and upgrade of state-of-the-art vertical mills.

Loesche is an owner-managed, export-oriented company, which was founded in Berlin in 1906. Today, the company operates from its head office in Düsseldorf and has subsidiaries, representatives and agencies around the world. It was in 1928 that Loesche built the first spring-loaded air-flow mills, which even today are still known as Loesche mills. Nowadays, Loesche vertical mills form the core of ma

ny plants used to dry-grind coal, cement raw materials, granulated slag, industrial minerals and ores. Thanks to its grinding plants with throughputs of 2 to 1000 t/h for the cement industry and self-inert, central coal-grinding plants for hard and brown coal power stations, Loesche is the global market leader for vertical mills and turnkey grinding mills. Loesche supplies turnkey plants, which are individually planned and built for the required process steps. This includes plants for processing, material storage, transportation and delivery, vertical mills, hot-gas generators, filter and separator systems, complete automation technology, plants for all aspects of construction above and below ground, steel construction and piping systems. The company has EN ISO 9001 certification and the grinding plants themselves are compliant with national and international safety regulations. At present, more than 400 people are working for Loesche in Germany, around 850 are employed worldwide.

04/06/2026

The adoption of alternative energy sources usually depends on how materials react inside the kiln. However, the greatest potential for improvement lies in the grinding circuit. When processing diverse, irregular inputs, a plant's equipment must maintain its integrity over the long term. This opens up new ways to make the process more stable from the very beginning.

We design every vertical roller mill with adaptability in mind, making them open and scalable, ready to evolve. Because of this strong foundation, as input conditions change, the internal components are ready for targeted upgrades and field retrofits. This removes the need to redesign the whole system.

When the main grinding parts maintain their original specifications, the entire system operates at its best. Accurate component geometries help lower energy use and keep the material bed balanced, even as loads change. We achieve process reliability by using advanced metallurgy, such as our PRONAMIC® weldable structural core layered with high abrasion resistance, to keep the internal mechanisms performing like new.

Because these special parts can be refurbished on-site with our service packages, plants can keep grinding efficiently year after year. Only minor wear is replenished during routine maintenance, eliminating the need to cast entirely new parts. By returning the grinding components to their exact original profiles right on the production floor, routine maintenance becomes a way to permanently protect the equilibrium of the plant.

01/06/2026

Many operating habits in cement plants began as practical answers to changing process conditions. Water injection is one of them. It can help manage temperature, support the grinding bed, and keep the mill steady when material behavior changes.

A useful measure of any grinding circuit is the amount of intervention required to maintain stability.

In a vertical roller mill, stability comes from the balance between grinding pressure, airflow, material retention, classifier performance, and process control. When these elements work together, the process relies less on water as an operating aid and more on the consistency of the grinding system. In many applications, less than 1% water injection is enough to maintain stable operating conditions.

This is where mature grinding technology shows its value. A stable mill provides a predictable process window, supports consistent product quality, and keeps resource consumption under control.

Grinding circuits today operate under different conditions than they did twenty years ago. Lower clinker factors, a growing range of supplementary cementitious materials, and new cement formulations have increased the complexity of the finished product. At the same time, the demands for strength development, consistency, and performance remain high. The grinding circuit must therefore produce consistent cement from increasingly diverse material combinations.

27/05/2026

When a plant introduces granulated blast furnace slag to reduce reliance on traditional clinker, evaluating true system capability becomes a matter of mechanical and thermal integration. Historically, incorporating this secondary material meant balancing an environmental choice with a compromise on early strength development.

The vertical roller mill combines comminution, high-efficiency classification, and drying within a single compact footprint. Managing these stages within a unified housing optimizes thermal utilization and material flow, allowing the system to dry wet slag feeds through direct contact with the hot gas stream while simplifying installation within existing plant configurations.

More importantly, this simultaneous milling, drying, and high-efficiency classification allows the system to achieve the ultra-fine specific surface needed to counteract the early strength limitation. Through the design of internal aerodynamics and thermal distribution, the technology treats variable moisture and fluctuating grindability as standard operational parameters. Responsive hydropneumatic roller tensioning controls fluctuating forces to maintain stability, supporting the production of high-performance composite cements.

25/05/2026

Because heavy industrial assets are designed to operate for decades, the path to lower emissions typically runs through existing infrastructure.

Most of the global grinding capacity for the next generation has already been invested in foundational machinery built for long operational lifecycles. The real value of these assets lies in their structural longevity and their ability to adapt to new process needs by retrofitting internal mechanisms.

This adaptability is most evident in the grinding circuit, where upgrading the internal mechanics requires balancing separation efficiency and bed stability. At the top of the mill, retrofitting a high-efficiency classifier prepares the internal aerodynamics to suit modern material requirements. Isolating finished particles early prevents overgrinding, so the system spends less energy reprocessing material that already meets the target specification. This reduction in internal circulation stabilizes the material bed under load, lowering pressure drops across the mill housing and cutting specific energy consumption.

This balance is reinforced on the grinding table through an S-Roller retrofit, which introduces hydropneumatic operation to the existing support rollers and actively engages them in the grinding cycle to manage the forces of new material streams. Working in tandem with the optimized airflow above, this mechanical upgrade smooths vibrations and creates a uniform material bed for the mill to sustain significantly higher product fineness and throughput within its existing footprint.

Process optimization views the mill as an adaptable platform designed to sustain peak efficiency throughout its operational lifetime. Our retrofits ⟶ https://product-catalog.loesche.com

21/05/2026

There are two sides to every ton of cement: one is strength, infrastructure, and progress. The other is carbon.

Vertical roller mills are just the beginning of how these two aspects come together, where steel slag re-enters production after leaving the furnace, demolished concrete returns as processed mineral feed, and clay changes chemically through calcination before returning to the grinding circuit again. Cement production is gradually moving from extraction toward reprocessing, with materials once treated as industrial residue being reintroduced into the process, bringing with them different thermal histories, mineral phases, and grinding behavior than conventional raw materials.

Inside the vertical roller mill, grinding does more than change particle size. Traditional clinker grinding relied on predictable behavior, but modern inputs introduce variability to the process. Changes in moisture content and particle resistance can cause sudden bed instability or uneven pressure drops within the mill housing. Achieving process continuity requires an active circuit that dynamically balances these behaviors, absorbing the variations before they affect the quality of the final product.

19/05/2026

A chemistry report might show that two kaolinitic clays look alike, but one can fluidize easily under high gas flow while the other clumps into a sticky bed. Inside a vertical roller mill, moisture, grain size, and stickiness each affect the equipment differently.

This unpredictable behavior under load demonstrates the operational realities when transitioning away from standard Portland clinker toward alternative binders.

At our Test Center, we track how these changing inputs react to table speed and gas velocity. This helps us turn complex material behaviors into clear process changes that guide production. Because industrial circuits run continuously, this real-time feedback allows us to design systems that become more stable over time. Materials change as they absorb heat, face repeated stress, and mix with byproducts during long cycles. Through automated testing, we replicate these recycling loops on a pilot scale, and observe how the process settles over several days, and adjust full-scale settings such as moisture control and dry grit recirculation.

This ongoing dataset also serves as a predictive tool for controlling operational settings during testing in new territories, such as with alternative binders like calcined clay or recycled concrete aggregates. We can simulate real industrial conditions with new materials before building a full-scale plant. Doing so gives us the precise processing parameters required to transform operational ambiguity into highly predictable performance metrics, giving producers total clarity for a successful industrial scale-up.

15/05/2026

Different materials require different strategies. So do the controls that guide them.

Being flexible in grinding means more than just working with different products. It also involves using the right control strategies as process conditions change and making adjustments that keep production steady, efficient, and reliable.

LMcontrol+ uses targeted step tests to find the best settings for an optimized operating point. The system slowly increases material feed within set limits, watching both dynamic and static process variables. If any limit is crossed, it automatically reduces the feed to keep things safe and stable. Product quality is managed with a priority circle, and polygon control lets the system set automatic targets when it detects certain process patterns.

LMcontrol+ monitors key process dynamics and automatically adjusts critical parameters. Its optimization modules for throughput, hydraulic pressure, drive speed, temperature, and gas flow help the grinding process adapt to changing needs. This way, process optimization is built into the system. The process improves not just because it is monitored, but also because it can respond precisely when conditions change.

For a closer look at LMcontrol+ and its technical capabilities, download the brochures here ⟶ https://www.loesche.com/media/brochures

13/05/2026

Moving the lever beyond the mill.

The transformation of cement production is increasingly happening between systems, in the interaction between grinding technology, alternative fuels, calcined clays, recycled concrete, ultra-fine grinding, and future CO₂ capture processes. At the same time, plants are working with less predictable fuel streams and changing material behaviour, placing greater pressure on process stability across the entire line.

Within GREENKEY Solutions, current work ranges from LC3 and slag grinding to biomass gasification, AI-supported flame analysis, and Dynamic Assistant process support for grinding efficiency, with the focus placed on maintaining stable operation as inputs continue to change. The process no longer adapts around fixed conditions. The conditions themselves are becoming variable.
⟶ https://www.loesche.com/sustainability-loesche

11/05/2026

As clinker substitution, material availability and energy demand continue to influence the design of plants and their operating conditions, supplementary cementitious materials (SCMs) are becoming increasingly important in cement production strategies.

With a new slag grinding plant for Ferro Duo in Duisburg, LOESCHE is contributing to one of the first industrial milestones in the development of a large-scale SCM platform for CO₂-reduced construction materials in Europe. The project combines superfine slag grinding with an electrical heating system and is designed for the processing of slag and additional mineral feed materials using a LOESCHE vertical roller mill with dynamic classification. Commissioning is scheduled for mid-2027.
⟶ https://www.loesche.com/news/loesche-contributes-set-industrial-scm-site-delivery-slag-grinding-plant-ferro-duo

📷 Reference image of a LOESCHE LM 46.2+2 CS vertical roller mill installation in Dunkerque, France.

04/05/2026

A grinding circuit runs through continuous variation, where the grinding bed is marked by the wear of the previous days, the current feed introduces different behaviour, and upcoming targets already push the limits of the setup. Before any trend appears in the data, internal circulation adjusts to these conditions.

The LOESCHE Service Catalog is part of this cycle, following the same sequence the mill moves through. It tracks these adjustments and offers interventions that stabilize the process as it evolves toward its next operating state.
⟶ https://product-catalog.loesche.com

Adresse

Hansaallee 243
Düsseldorf
40549

Öffnungszeiten

Montag	09:00 - 17:00
Dienstag	09:00 - 17:00
Mittwoch	09:00 - 17:00
Donnerstag	09:00 - 17:00
Freitag	09:00 - 17:00

Telefon

+4921153530

Webseite

http://www.loesche.com/

Benachrichtigungen

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