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)

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• 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)

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Loesche is an owner-managed engineering company founded in Berlin in 1906 that designs, manufactures and services vertical roller mills for grinding of dry-grind coal, cement raw materials, granulated slag, industrial minerals and ores.

Company History

In 1824, Joseph Aspdin, a mason and bricklayer from Leeds, was granted the first patent for the production of a new construction material, Portland cement. In 1845, his son William introduced the new variety of cement in the market. The first cement works were opened in Germany in the middle of the 19th century. One of the pioneers of the German market was the company Brunckhorst & Westphalen, which began producing Portland cement in Buxtehude in 1850. When constructing their first cement works, the Germans based their technology heavily on the used by the lime works, brick works, and grain mills of the day. The new construction material quickly caught on and countless new cement works sprang up all over the country. In 1877, these first companies joined forces and established the Verein Deutscher Zement-Fabrikanten (Association of German Cement Manufacturers) which changed its name to the Verein Deutscher Zementwerke (German Cement Works Association) in 1952.

In the early years, the quality of the cement produced by the German cement industry varied hugely becausethere was no standard set of criteria for cement production. For this reason, many customers considered German cement to be inferior to English cement. It was only when the Verein Deutscher Zement-Fabrikanten established its first standards in 1878 that faith in German cement began to grow. erman cement quickly overtook English cement. The period of rapid growth in cement production that followed triggered a profound crisis for the young industry in the early years of the 20th century. Supply exceeded demand and prices plummeted. Is was only with the foundation of a syndicate in 1904 that production was adjusted to suit demand, thereby leading to a stabilisation of cement prices. This in turn heralded the start of an upswing in the industry.

1919 - 1939 - Success through innovation: entrepreneur and inventor Ernst Curt Loesche

Even though the German cement industry found itself in a deep and sustained crisis after World War I, the Curt von Grueber design company managed to survive by entering a new market: in 1924 the company began supplying mills for new coal-fired power stations. In 1927 Ernst Curt Loesche developed the LOESCHE mill for the Klingenberg power station in Berlin-Rummelsburg. This mill proved to be a milestone in the history of roller grinding mill technology. The company grew rapidly thanks to the success of the LOESCHE mill. However, these positive developments suffered a setback with the world economic crisis in the early 1930s. As the global economy recovered, the company's fortunes also changed. The demand for LOESCHE mills rose and rose. During this period, the company sold mills to customers around the world. In 1937 Curt von Grueber sold his shares to Ernst Curt LOESCHE, who thus became the company's sole owner.

1939 – 1948 - Hard times: From the war economy to expropriation by the Soviets

The outbreak of World War II marked a break in the company history of Ernst Curt Loesche. Just like many other machine manufacturers, the company was also forced to produce war material for Germany: the German air force replaced the cement industry as the company's largest customer. Following its destruction during an air raid in 1943, production at the Teltow plant was practically wiped out. In 1945, at the end of the war, the soviet occupation forces insisted on dismantling the company's machinery in Teltow and shipping it back to the Soviet Union. Only a few months later, the company was back in business with antiquated machinery. When the soviet military administration expropriated the Curt von Grueber Maschinenbauanstalt without any compensation whatsoever in April 1948, Ernst Curt LOESCHE decided to leave Berlin and set up his company again in one of the three western occupation zones.

1948 – 1969 - Like a phoenix from the ashes: New beginning with Ernst Günter LOESCHE

After the expropriation of the Berlin works, Ernst Curt Loesche and a handful of his employees from Berlin began rebuilding the company under the name LOESCHE Hartzerkleinerungs- und Zementmaschinen KG in a ruined building in Düsseldorf in the summer of 1948. When Ernst Curt Loesche died unexpectedly in November that year, his son Ernst Günter took over the business. Under his management and with its own factory in Neuss, LOESCHE KG regained world market leadership between 1950 and 1970. During this period, LOESCHE engineers developed numerous new technologies of the greatest importance for developments in the hard crushing sector, such as the hydropneumatic spring assembly and the pressure mill for grinding coal.

1969 – 1983 - The 4-roller mill as key to global success: The company's international expansion

In the early 1970s LOESCHE was confronted with a new challenge: improvements in cement kiln technology necessitated the construction of ever larger mills. LOESCHE responded to this challenge by inventing the 4-roller mill and introducing a modular mill system. The 4-roller mill rapidly became a huge success in the international market. In order to provide its customers around the world with better local support, LOESCHE founded subsidiaries in Spain and South Africa. In the late 1970s, the LOESCHE engineers adapted the modular system for use in coal mills. After 35 successful years at the head of the company, Ernst Günter LOESCHE retired at the end of 1983.

1983 – 1992 - The third generation: Dr. Thomas Loesche and the globalization challenges

With Dr. Thomas Loesche at the helm, the third generation of the Loesche family began running the company. The young engineer not only continued where his father had left off, but also developed promising new business activities such as support for and construction of mills for the iron and steel industry. Other innovations included the development of an improved hot gas generator and the use of LOESCHE mills for grinding coal and peat briquettes. The company continued to expand and in 1992 relocated to a new, larger office building in Hansaallee.

1992 – 2006 - Technology for the 21th century: Laying the foundations for leadership in the international market

In the early 1990s, LOESCHE introduced another innovative mill design in the form of the 2+2 cement clinker mill. Just like earlier LOESCHE inventions, this mill enjoyed outstanding global success. In the years that followed, LOESCHE GmbH expanded its range of products and services and invested heavily in the development of new technologies. The 1997 economic collapse in South-East Asia plunged the company into a deep crisis. However, new ideas and a number of rationalisation measures put the company back on an upward path,. Two inventions of this period are the slide-in procedure and the introduction of ‘redundancy operation". Demand began to pick up again, and 2003 saw LOESCHE with an impressive product range including leading-edge mills. Very quickly the company was once again the worldwide market leader in its field.

2006 – 2010 - International market leadership

On 1 August 2008, LOESCHE GmbH Düsseldorf established LOESCHE Automation GmbH, a 100% subsidiary.

LOESCHE attaches great importance to quality. Since 1998, continuous process development and quality management have been audited every three years. In May 2009, their certificate was prolonged by the internationally renowned certification institute Lloyd’s Register Quality Assurance (LRQA) until 2012. This certification is based on ISO 9001:2008, valid since December 2008.

The world's largest mills, the LOESCHE mill LM 69.4 and LM 69.6 for cement raw material with throughputs of up to 1200 t/h were sold 14 times around the world. In addition, the world's largest grinding mills for clinker and granulated slag were developed, manufactured and supplied. Worldwide, the 100th LOESCHE mill for grinding cement and granulated slag was sold.

Products

LOESCHE 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 LOESCHE mills are now used by the cement industry around the world. They have two, three, four and six rollers. In the 1930s the LOESCHE 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).

LOESCHE 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 LOESCHE. Also active in this field at the time were companies such as Japan-based ONODA. The first use of a LOESCHE mill 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 the breakthrough in grinding such materials only in the early 1990s. Loesche introduced the spring-loaded roller grinding mill for comminuting coal in the 1920s.

Since the end of the 1930s the LOESCHE 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

LOESCHE mills for ores and minerals

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

LOESCHE 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 LOESCHE has developed a special series of mills for industrial minerals.

LOESCHE dynamic classifiers

The efficient LOESCHE Classifier can be used in LOESCHE 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.

LOESCHE hot gas generators

The LOESCHE hot gas generator is available in two models:

LOMA Heater

In the mid 1960s LOESCHE 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.

LOESCHE 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. LOMA Heaters are continuously improved and meet the current technical standards. By 2009 more than 600 of these hot gas generator 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 LOESCHE 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 LOESCHE 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.

LOESCHE Automation

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

LOESCHE Automation is the integrator of leading-edge machine technology and intelligent process control for optimum and efficient plant operation. LOESCHE 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.

The decades of experience enables LOESCHE to meet the often complex specific requirements with intelligent, process and control engineering solutions.

LOESCHE Service

Modernising existing plant

Some of the improvements and developments, which are continuously integrated in new LOESCHE mills, can also be used for modernising existing LOESCHE mills. An existing plant is a candidate for such optimisation even if it contains units from different manufacturers.

Subsidiaries

Brazil
Loesche Equipamentos Ltda.[1]
Rua México 119 sl. 1908
20031-145 Rio de Janeiro, Brazil
Tel. +55 - 21 - 22 40 79 00 / Fax +55 - 21 - 35 53 26 63
Email: loesche@terra.com.br

Great Britain
Loesche Energy Systems Ltd.[2]
2, Horsham Gates
North Street, Horsham, RH135PJ, United Kingdom
Tel. +44 - 1403 - 223 101 / Fax +44 - 1403 - 223 102
Email: loesche@loesche.co.uk

India
Loesche India Pvt. Ltd.[3]
D - 83, Sector - 2
Noida - 201301, U.P., India
Tel. +91 - 120 - 40 18,500 / Fax +91 - 120 - 40 18,590 - 92
Email: loesche@loescheindia.com
www.loescheindia.com

Iran
Loesche Middle East FZE TB[4]
Unit 10, 3rd Floor, Building No. 12
4th Alley, Ghaem Magham Ave
Upper Mottahari Street, Tehran, Iran
Tel. +98 - 21 - 887,420 28 / Fax +98 - 21 - 887 320 03
Email: info@loesche.ir
www.loesche.ir

Russia
OOO Loesche[5]
Berezhkovskaya Naberezhnaya 16a/2
P.O. Box 97
121059 Moscow, Russian Federation
Tel. +7 - 495 - 988 50 81 / Fax +7 - 495 - 988 60 86
Email: info@loesche.ru
www.loesche.ru

Spain
Loesche Latinoamericana S.A.U.[6]
Condesa de Venadito 1, Planta 4
28027 Madrid, Spain
Tel. +34 - 91 - 458 99 80 / Fax +34 - 91 - 457 10 17
Email: loesche@loesche.es
www.loesche.es

South Africa
Loesche South Africa (Pty.) Ltd.[7]
55 Empire Road, Empire Park, Block C
2193 Parktown, South Africa
Tel. +27 - 11 - 482 29 33 / Fax +27 - 11 - 482 29 40
Email: loesche4@global.co.za

USA
Loesche America, Inc.[8]
20170 Pines Boulevard, Suite 301
Pembroke Pines, Florida 33029, USA
Tel. +1 - 954 - 602 14 24 / Fax +1 - 954 - 602 14 23
Email: webmaster@loescheamerica.com
www.loescheamerica.com

United Arab Emirates
Loesche Middle East FZE[9]
P.O. Box 262 622
Jebel Ali, Dubai, U.A.E.
Tel. +971 - 4 - 886 59 11
Fax +971 - 4 - 886 59 22
Email: info@loesche.ae

People's Republic of China
Loesche Mills (Shanghai) Co., Ltd.[10]
18 Mid-Xizang Road
Room 901–902, Harbour Ring Plaza, Huangpu District
200001 Shanghai, P. R. China
Tel. +86 - 21 - 5385 - 3366 / Fax +86 - 21 - 5385 - 3386 Email: info@loesche.cn

People's Republic of China
Loesche Mills (Shanghai) Co., Ltd.[11]
5 Dongzhimen South Street
Room 817-818, CYTS Plaza
Dongcheng District, 100007 Beijing, P. R. China
Tel. +86 - 10 - 5815 - 6205 / Fax +86 - 10 - 5815 - 6220
Email: info@loesche.cn

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