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• Pioneer & Pacemaker in Grinding
• Cement Raw Materials
• Cement Clincker & Blast Furnace Slag
• Rocks, Clays, Earths, Minerals & Ores
• Coal Mills

Products by Loesche America:

Dry-Grinding Plants

Pioneer and Pacemaker in Grinding
The patent for the roller grinding mill in 1928 was a milestone for the company and this branch of industry, because based on its design principles, the roller grinding mill possesses an operational flexibility unsurpassed to this day.

Loesche roller grinding mills are applied with great success to the most varied raw materials. These include:

• Cement raw materials, Cement Clinker, Cement blends, Pozzolane, Limestone, Burnt lime and Blast Furnace Slag,
• Hard Coal, Brown Coal, Lignite, Anthracite, Petroleum and other Coke types,
• Phosphate, Feldspar, Talcum, Clay, Kaolin, Bentonite, Barite, Graphite, Colemanite, Titanium Dioxide, Titanium Slag, Minerals and Ores.

Loesche roller grinding mills are the most efficient mills in the world and achieve very high throughputs. They are also extremely maintenance friendly. Service tasks can be carried out quickly. Downtimes are therefore reduced to a minimum.

The use of ball media grinding was further developed in 1959 for use in cascade mills. In these mills ferrous and non-ferrous ores are milled; or refuse and sewage sludge combined to produce a homogenous ground product.

The cascade mill finds an equally successful application when drying and grinding chalks in an autogenous process.

As an experienced supplier of process systems - having started with shaft kiln technology - we today concentrate our efforts on further core technologies in the cement industry.

Cement Raw Materials
More than 100 years we have been concerned with comminution. Loesche roller grinding mills remain the heart of our dry-grinding installations in the cement industry worldwide.

The Loesche grinding principle combines a horizontal grinding table with large tapered roller under hydropneumatic loading - the best possible compromise between output and wear. We supply 2-, 3-, 4- and 6-roller mills to suit the required output; the product quality can be varied during operation by altering the classifier speed. All Loesche mills can be started with grinding rollers raised. Metal-to-metal contact between the grinding parts does not occur. Their quiet, ‘smooth’, operation is appreciated.

The great flexibility of Loesche mills:
A 6-roller mill can be operated as a 4-roller mill with a capacity of around 80 %. A 4-roller mill can be operated as a 2-roller mill with a capacity of 60%.

Our roller grinding mills are supplied for pressure or suction operation, with internal or external circulation, with rotary or static classifiers as well as with vertical or side raw material feed.

The cost advantages of Loesche roller grinding mills in comparison with other systems of grinding with regard to building expenditure, energy consumption and wear behavior have been verified and published.

For more information please read our latest article “Redundancy and Interchangeability – large vertical roller mills for grinding cement raw material” or contact our Sales Department directly.

Cement Clinker and Blast Furnace Slag
Loesche's 2+2 and 3+3 Technology for Clinker and Slag Grinding

Loesche introduced the 2+2 technology for clinker and slag grinding in 1994 into the market. The first mill of this kind started up in 1994 in the Pu-Shin plant of Lucky Cement, Taiwan, R.O.C.. It produces 500.000 t/y of a 3.400 cm²/g OPC and 250.000 t/y of ground granulated blast furnace slag (GGBS) of 4.300 cm²/g. The second mill started up early 1995 for GGBS only.

Since then the 2+2 system became a widespread reliable technology for clinker and slag grinding. Until the end of 2002 36 mills have been installed with a total power of approx. 110.000 kW and a production capacity in total of approx. 5.500 t/h.

It was not until 2003 that demand for mills in the cement industry began to pick up slowly. Now, however, customers were looking for bigger and more powerful mills. Loesche received orders from Orissa Cement and Dalmia Cement in India for what was at the time the largest cement mill in the world, the LM 56.3+3. The mill has the capability of producing over 300 t/h. In the first 20 hours of operation, the plant OCL in Rajgangpur produced an astonishing 6.300 tonnes of cement.

The mills produce OPC as well as cements with interground additives like blast furnace slag, limestone, pozzolana and fly ash. The excellent drying capability of the mills allow the use of moist additives. In many plants the high flexibility of the system is utilized and between 2 and 6 different types of cement are produced in the same mill. Switching from one product to the other can be done within minutes.

GGBS can be produced in Loesche mills with the 2+2 and 3+3 technology highly energy efficient. The drying capability of the Loesche mill allows the use of slag with moisture contents of 15 % and more. Surface areas of more than 6.000 cm²/g (BLAINE) have been reached. Power savings of 50 % and more in comparison to ball mills can be achieved.

For more detailed information please ask for our brochures or contact us here.

Rocks, Clays Earths, Minerals and Ores
For the basic raw materials industries and other industrial sectors LOESCHE supplies roller grinding mills for the maximum production capacity of:

barite kaolin bentonite limestone burnt lime magnesite colemanite manganese dioxide

dolomite phosphate feldspar titanium dioxide gypsum titanium slag etc. graphite minerals and ores

We supply all necessary equipment: from storage of raw materials in blending beds and bunkers to grinding, drying, classifying, intermediate storage of finalized products and dispatch equipment.

Either rocks, clays or earths - you only need to tell us the quality of the source material and the finished product. We plan and build a plant that is tailor-made for your purpose for grinding, preparation and drying or pyro-processing plants.

For grinding and interparticle comminution of minerals and ores Loesche vertical roller mills are also very efficient. Plants can be designed with airswept or overflow mills.

The use of ball media grinding was further developed in 1959 for use in Loesche cascade mills. In these mills ferrous and non-ferrous ores are milled. Our cascade mill finds an equally successful application when drying and grinding chalks in an autogenous process.

Coal Mills
Since 1925 - for over 80 years - we have been concerned with pulverized fuel for kiln and boiler firing. For all grades - hard coal, woody lignite and lignite as well as anthracite coal and petroleum coke - we design and build, on turnkey basis, safe and reliable dry-grinding installations for pressure, suction or inert operation, equipped with Loesche pressure-shock-resistant grinding mills.

The Loesche coal mill is a modular and flexible design. The modular design allows a 2, 3 or 4 roller mill to be custom built to suit the required output. This saves time and money from the design to the erection stage.

The ground product quality is consistently high irrespective of plant capacity. During start, stop and full or partial-load operation, no contact takes place between the grinding elements to disturb the vibration free running. A flat grinding track - individually guided - adjustable rollers and a roller swing-out device for servicing ensure that the Loesche coal mill achieves almost 100% availability. The service for the mill is easy to maintain.


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