Loesche

• Comment: All sources used are non-reliable sources. It also reads like an advert. Please see the pink boxes to find links on how to remedy this. Thanks! SarahStierch (talk) 00:44, 3 June 2013 (UTC)

---

• Comment: This is a notable company, presumably. Howevere, the submission set forth is highly promotional and needs independent and reliable sources. FoCuSandLeArN (talk) 15:45, 1 June 2013 (UTC)

Loesche is an owner-managed engineering company founded in Berlin in 1906 and currently based in Düsseldorf, Germany that designs, manufactures and services vertical roller mills for grinding of coal, cement raw materials, granulated slag, industrial minerals and ores. At present, more than 400 people are working for Loesche in Germany, around 850 are employed worldwide.

Products

Mills for cement raw material

Since the second half of the 20th century, cement raw material has been ground almost entirely in grinding mills (vertical air-swept mills). Hundreds of thecompany's mills are now used by the cement industry around the world. They have two, three, four and six rollers. In the 1930s these mill was used for the first time to grind cement raw material.

The great breakthrough came in the early 1960s with the introduction of rotary kilns with heat exchangers (drying process).

Mills for cement clinker and blast furnace slag

The grinding of cement clinker and granulated slag in grinding mills (vertical air-swept mills) is a technology introduced by the company. The first use of one of the company's mills with a grinding-track diameter of just 1.1 m for grinding cement clinker had already been recorded back in 1935. However, the roller grinding mill experienced a breakthrough for grinding such materials only in the early 1990s, The company introduced the spring-loaded roller grinding mill for comminuting coal in the 1920s

Since the end of the 1930s the company's mill has also been used to grind cement raw material. The great breakthrough in this field of application came in the 1960s. Soon the cement industry was expressing a desire to produce the end product of cement by means of roller comminution due to its lower energy requirements. The first field tests in Asia to grind cement with Loesche mills were characterised by erratic mill operation. The reason for this was inadequate grinding-bed formation.

This discovery gave rise to the patented solution of a modified Loesche mill for fine grinding: LM – CS (Cement / Slag). Preparation rollers (support rollers) prepare the grinding bed, while the grinding rollers (master rollers) perform the actual comminution. The entire cement production process was optimised in the 20th century. The energy-intensive clinker grinding process remained inapplicable for a long time. The quality demands on the wide range of cement products delayed the introduction of the state of the art in this sector, too.

LOESCHE mills for solid fuels

Since 1925 LOESCHE has been involved in the processing and grinding of solid fuels, with the main emphasis being on coal, and experience in other fuels such as: bituminous coals, anthracite coals, petroleum coke of varying qualities, hard lignite, pre-dried lignite, pre-dried and pre-ground timber (wood pellets), turf pellets and turf briquettes, straw pellets and sewage sludge

mills for ores and minerals

The firm has more than 100 years of experience in the comminution of cement and raw material, clinker, coal, slag and minerals. Their mill has been used in the ore industry since 1961.

mills for industrial minerals

LOESCHE also has experience in the grinding of various industrial minerals such as limestone, dolomite, marble, chalk, quick lime, barite, bentonite, colemanite, phosphate rock, anhydrite, talc, manganese oxide, magnesite, etc.

These are grounds using LOESCHE mills in a wide range of industries such as steel, fertilizers, chemical, feedstuff, paper, glass, plastics, paint, building material, power plants, food industry, road construction and crude oil.

Industry requires such mineral materials mainly in throughput rates of between 5 t/h and 80 t/h. The main flow rate lies between 5 t/h and 25 t/h with product finenesses of 1% R 25 µm to 1% R 300 µm. For these special requirements the company has developed a special series of mills for industrial minerals.

dynamic classifiers

The firm's efficient Classifier can be used in its grinding mills and all air-swept grinding plants. The classifiers are designed for central or non-central material feed and can be used for all materials to be ground.

This classifier can separate particle sizes of up to 1 µm (and output products with residues of 1% R 10 µm). The mechanical components in combination with process influencing parameters can produce various particle size distributions.

hot gas generators

The firm's hot gas generator is available in two models:

Heater

In the mid 1960s the firm developed the perforated jacket heater - a heat resistant steel chamber with burner muffle. It is marketed under the name LOMA Heater. The LOMA Heater has been deployed for decades around the world to optimise a wide range of thermal processes.

Hot gas generators are used where hot gases are needed for direct drying, for example in the cement, steel, stone and earth, ore, wood, feedstuff and chemicals industries. . By 2009 more than 600 of the company's hot gas generators for heat flows of 100 kW to 64,000 kW had been supplied for industrial use.

Muffle heating

Muffle heating is suitable for maximum hot gas temperatures of up to 1,200 °C. The combustion chamber is fully lined with refractory material.

Fuels

A wide range of fuels can be used for the firm's hot gas generators such as: natural gas, biogas, coke, blast furnace, low calorific, synthetic, liquid, light oil, heavy oil, diesel oil, wood dust, lignite duast and coal dust.

Process integration

The firm's hot gas generator is deployed in combination with a wide range of grind-drying plants and also in thermal plant such as drum driers, fluidised-bed furnaces, flash driers, spheroidizers.

Automation

The firm has developed and built the largest and most powerful grinding mills in the world. Their grinding mills for dry grinding form the heart of the product portfolio. The mills are planned specifically for the required process stages and equipped with the corresponding technology.

It is the integrator of leading-edge machine technology and intelligent process control for optimum and efficient plant operation. The firm offer tailored engineering services for process, hardware and software development. This encompasses all disciplines, from process control engineering and the entire electrical equipment on site through to service, maintenance and customer training.

External links

Official Website

Bibliography "Mills for the World" 100 Years Loesche, 1906 - 2006

Brundiek, Horst. Die Geschichte der Loesche-Mühle, manuscript.
Brundiek, Horst, Kohlenmühlen un mittlere Lesitungen (Problemstellungen und Problemlösungen an Fallbeidpielen), paper given at the conference "Technik im Gespräch" in Düsseldorf, 17 March, 1982
Brundiek, Horst, "Horst Brundiek - The Father of the 4-Roller-Mill", special edition Zement-Kalk-Gips, 2000
Curt von Grueber Maschinenbau Aktiengesellschaft Berlin, Special print-out from the Deutsches Wirtschaftarchiv, date unknown.
Publication commemorating the 75th anniversary of the foundation of the company, Düsseldorf, 1981
Fischer, Wolfram (publisher), Die Geschichte der Stromversorgung, Frankfurt a.M., 1992
Loesche E.G. and Frommelt, G, "Das moderne Schachtofenwerk Semen Kupang auf der Insel Timor /Indonesien", special edition of ZKG, year 37 (1984) no. 12, p. 3-7
Verein Deutscher Zementwerke e.V. (publisher), 125 Jahre Forschung für Qualität und Fortschritt, Düsseldorf, 2002

Other References

Lexikon der Weltmarktführer
Verlag: Deutsche Standards EDITIONEN

Zement und Kalk: Der Baustoff als Werkstoff (Baupraxis)
Jochen Stark, Bernd Wicht
F. A. Finger-Institut für Baustoffkunde der Bauhaus-Universität Weimar (Herausgeber) Birkhäuser Verlag, November 1999, ISBN-13: 9783764362164

Zement-Taschenbuch 2009
Verein deutscher Zementwerke e. V. (Herausgeber)
Vbt Verlag Bau U. Technik; Auflage: 51., veränd. Ausg. (Mai 2008), ISBN-10: 3764004991, ISBN-13: 978-3764004996

Zement. Grundlagen der Herstellung und Verwendung
Friedrich W. Locher (Author)
Vbt Verlag Bau U. Technik (2000), ISBN-13: 978-3764004002

Cement Data Book, Volume One: International Process Engineering in the Cement Industry
Duda, Dipl. Ing. Walter H.
Bauverlag GmbH Wiesbaden und Berlin ISBN 10: 3762521379

Cement Data Book - Internationale Verfahrenstechniken der Zementindustrie
Duda, Dipl. Ing. Walter H.
Bauverlag GmbH Wiesbaden und Berlin ISBN 10: 3762521379