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Loesche

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

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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 many 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.

02/11/2026

Controlling concrete setting time includes managing the thermal conditions inside the cement grinding plant. For concrete to remain workable long enough to be placed and compacted, gypsum is interground with clinker to regulate early hydration. How effectively it performs that role depends partly on the thermal conditions it encounters during grinding.

Inside a LOESCHE vertical roller mill, the incoming materials are dried by heat from grinding and the hot process gases. During this process, the gypsum loses some of its chemically bound water and becomes hemihydrate. When the finished cement is mixed with water, the hemihydrate dissolves more readily than gypsum. While some partial dehydration is expected, excessive or insufficient conversion is concerning because it can accelerate setting and reduce workability.

During commissioning, setting tests show whether the cement meets the required setting times. If adjustments are needed, the sulfate addition is reviewed for the clinker being used, together with the mill’s drying conditions. Changing the sulfate amount or form, or adjusting outlet temperature and gas moisture, gives the quality team several ways to correct the setting behavior.

29/10/2026

An existing mill’s throughput and product requirements deserve a fresh evaluation as production needs change. Modernization includes examining how the grinding table works with the classifier, as well as whether its operating speed offers room for adjustment.

A more efficient classifier reduces the amount of sufficiently fine material returning to the table, avoiding unnecessary further grinding. For our LSVS classifier retrofit, we recommend a table retrofit depending on the existing configuration, considering grinding and separation together when defining the work required.

On installations with compatible slip-ring motors, Smart Powertrain introduces variable motor and grinding-table speeds through the Smart Drive. This gives the mill another means of adjusting throughput to different feed materials and product requirements, with process optimization establishing suitable table speeds for the installation.

Modernization options in our Service Catalogue. ⟶ https://product-catalog.loesche.com

26/10/2026

Our colleague Jan Martens and co-authors Dr. Carsten Gerold, Rodrigo Ferrari, and Juan Jose Frausto (Metso) have been awarded the 2025 CEEC Medal for Operations & Design for their paper, “Extending the Dry Processing Route.”

Their research evaluates practical pathways to extend dry processing within mineral processing flowsheets, focusing on reducing process water consumption.

Jan received the award in person on 19 October at AusIMM’s Mill Operators Conference in Brisbane and commented, “Our industry faces significant sustainability challenges, but meaningful progress is only possible when we work together to provide the resources society needs while protecting the environment for future generations.”

Congratulations to Jan and his co-authors on this accomplishment, and thank you to CEEC International for celebrating work that contributes to sustainable mineral processing.

22/10/2026

A cement plant relies on the heat generated by clinker production to prepare the materials necessary to keep the kiln running. In the preheater tower, hot gases warm the raw meal before it reaches the burning zone. Further along the gas path, the remaining energy dries the moist feed inside the vertical roller mill.

Our GREENKEY Solutions' technologies become part of these existing connections. Producing calcined clay through C/CLAY involves heating the material to temperatures suitable for activation. Using alternative fuels with A/FUELS requires examining the combustion conditions and the gas supply used for drying.

Preparing for carbon capture extends this examination to the point where the gases are collected. Bringing process streams together for capture requires considering their heat content and the processes that still rely on them. Modernization includes tracing each proposed connection through the plant and considering the material preparation that must continue while the thermal system changes.
⟶ https://www.loesche.com/solutions/greenkey-solutions

19/10/2026

Although reducing a grinding plant’s footprint offers opportunities to save on steel and civil construction costs, bringing buildings closer together leaves less room for assembly. The space required for installing large components must be considered in relation to their final positions.

Our Variant Management concept uses standardized building modules that can be arranged to suit the site and its terrain. One documented way of keeping assembly unobstructed is by separating the electrical room, while cable routes are incorporated into the initial planning.

The same modular concept is applied to maintenance access, including arrangements that reduce the size of the mobile crane needed for maintenance work. These layout decisions affect how equipment is accessed during operation and installation.

This system applies to both new installations and projects within existing plants, where the arrangement is adapted to the space and terrain available.

15/10/2026

New cement formulations bring a wider range of materials and more demanding fineness targets. Designing a mill with a wider stable operating range gives it greater flexibility as production requirements evolve.

A vertical roller mill configured for swing mode retains the same mechanical assembly while grinding conditions change between products.

The same grinding chamber processes materials with different grinding requirements. Each campaign needs operating conditions suited to its feed and required product fineness.

Self-excited vibrations define one physical boundary of VRM performance. As a mill approaches its dynamic limits, grinding pressure or throughput may need to be reduced to maintain stable operation.

Our Dual Module concept and revised grinding track design reduce these vibrations and extend the mill’s stable operating range. Depending on the production duty, the additional margin is available for higher grinding forces or finer products.

For each product, the required fineness has to be considered together with the throughput achieved during stable operation. Those conditions establish the production capability available for that campaign.

12/10/2026

The use of lower-carbon cement means that the design of grinding processes is more closely connected to regional geology and the materials available from local industries.

Granulated blast-furnace slag and fly ash are well-established supplementary cementitious materials. Natural pozzolans and calcined clays expand this range, and treated steel slag and recovered cement paste present additional processing challenges. These materials introduce different grinding behaviors and moisture levels to the grinding circuit.

Even within the same SCM category, materials from different sources may require different grinding conditions. Grindability informs mill sizing and operation, while moisture content affects the drying duty. We characterize the proposed feed and assess its grindability. The resulting test values are used to develop individual mill and machine layouts for the application.

Plants serving similar construction markets may use entirely different raw materials depending on the local industry. The engineering task is to configure the grinding process around those regional resources while maintaining the performance of finished cement as clinker content decreases.

08/10/2026

A limestone particle that is too coarse to meet the specification for a fine powder may still have value in mortar production. In a conventional grinding circuit, material rejected by the classifier returns to the grinding table for further comminution. A grit extraction system provides an alternative route.

In this configuration, an extraction screw diverts material collected through the classifier grit cone. Fine powder continues overhead with the gas stream, while the diverted grit exits as a distinct, coarser product stream.

Subsequent screening or classification can separate the extracted grit into fractions according to product requirements.

Configuring a grinding circuit for multiple product streams starts with those grain size targets, with specifications for different grades indicating how much grit should be extracted and which additional separation steps are required. Planning for several products begins with these requirements before the circuit is configured.

06/10/2026

Grinding trials give us a way to examine how a modified grinding surface performs with the material it processes.

At our Technikum in Neuss, pilot-scale grinding plants operate on the same principles as our industrial installations, with additional flexibility for testing and recording process data.

Material characterization and grindability tests generate the values used to develop individual mill configurations. Alongside this work, our team investigates changes to the equipment, including modified grinding-part designs and different wear-resistant materials.

The Test Center also gives us scope to investigate different processing routes. Combining the laboratory mills with cyclones, for example, makes it possible to separate an ultra-fine product for special cement applications. These trials give us a measured basis for assessing how the required product fineness can be achieved and for incorporating the appropriate processing route into the industrial plant design.

02/10/2026

Where the gas circuit meets the grinding process.

Ground material leaving the rotating table is captured by the upward gas stream and conveyed toward the classifier. The same process gas also provides the heat required for drying when moist feed is processed, while its passage through the mill creates pressure losses.

The route taken by that gas continues through the wider mill circuit. Around the louvre ring, gas distribution changes the local flow velocities around the grinding track. An optimized ring duct and revised louvre ring create a more uniform flow, reducing pressure losses while maintaining material transport toward the classifier.

The external duct system forms the continuation of that same gas path through the plant. During a Technical Audit, the grinding circuit is examined for mechanical and process-related bottlenecks, with the louvre ring and complete grinding unit forming part of that assessment.

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

Website

http://www.loesche.com/

Benachrichtigungen

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