Invention and Applications of the Rotary Kiln
The invention of the rotary kiln :
Rotary Kiln originated in cement production,in 1824, mason J Asp invented
the earthen vertical kiln intermittent operation; in 1883, Dietz world
invented the continuous operation of the multi-storey shaft kiln; in 1885 ,
Britons Lan Samu ( ERansome) invented the rotary kiln, it got patent in Britain,
and put into production in the United States , which has soon obtained
considerable economic benefits.
The application of the rotary kiln :
The invention of the rotary kiln
makes the cement industry develops rapidly, while also promoted the rotary kiln
applications research, the rotary kiln is widely applied to many industrial
areas soon, and more and more important in the production, gradually becomes the
corresponding core production equipment. Its technical performance and
functioning determine the quality, productivity and cost of enterprise products
to a large extent . "As long as the large kiln turn, there are thousands and
thousands" this ballad is the vivid description on the production of rotary kiln
importance .
Application of the rotary kiln :
① In the application field of the
rotary kiln, the largest number occupied is the cement industry. The entire
production process of cement can be summarized as "two grinding burn", "burn" is
good raw material grinding preparation, the role of the high temperature of the
rotary kiln burning process clinker. Therefore, the rotary kiln is the host of
cement production , which also commonly known as the "heart" of the cement
factory.
② in the building materials industry, besides the calcination of
cement clinker,the rotary kil is also used the calcined clay, limestone and slag
drying; rotary kiln calcination of raw materials in the production of refractory
materials, its dimensional stability, strength increase, reprocessing
molding.
③ ferrous and ferrous metallurgy, iron, aluminum, copper, zinc, tin,
nickel, tungsten, chromium, filing a metal such as a rotary kiln smelting
equipment, such as ores, concentrates, intermediate sintering, calcination. Such
as: aluminum hydroxide aluminum production with it calcination into alumina;
ironmaking with the production of pellets for blast furnace ironmaking; the
foreign "SL / RN Act", "Krupp law with its iron ore direct reduction;
chlorinated volatile roasting tin and lead it extracts.
④ in the
beneficiation process , use the rotary kiln to magnetization roast the lean ore,
makes the weak magnetic ore becomes the strong magnetic ore, for the convenience
of magnetic selecting
⑤ in the chemical industry, the rotary kiln is utilized
to produce soda, calcined phosphate, barium sulfide and so on. in the 1960s, the
United States LapPle invented the new process rotary kiln production of
phosphoric acid. The method has low energy consumption, less electricity,
without sulfuric acid and can be used in low-grade phosphate rock these
advantsges, so it was quickly getten promotion. In addition,in the
environmental aspects , the world's developed countries use cement kilns to
burn hazardous waste, garbage more than 20 years, which not only makes waste
minimize, harmless and waste, the waste can also be used as fuel to save coal ,
thus achieve the purpose of protecting enviroment.
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