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    Home > News

    Rotary kiln is the heart of cement production line and the star of building materials industry

    In building materials, metallurgy, chemical industry, environmental protection and many other production industries, rotary kiln equipment is widely used for mechanical, physical or chemical treatment of solid materials. This kind of equipment is called rotary kiln.

    The application of rotary kiln originated from cement production. In 1824, J. ASPP, a British cement worker, invented the earth shaft kiln with intermittent operation; In 1883, German Dietrich invented the multi-layer vertical kiln with continuous operation; In 1885, lansam, an Englishman, invented the rotary kiln and put it into production after obtaining patents in the United Kingdom and the United States. The invention of rotary kiln not only makes the cement industry develop rapidly, but also promotes people's research on the application of rotary kiln. Soon, rotary kiln is widely used in many industrial fields, and becomes more and more important in these production, becoming the core equipment of corresponding enterprises. Its technical performance and operation, to a large extent, determine the quality, output and cost of enterprise products“ As long as the kiln turns, there will be tens of millions. "This ballad is a vivid description of the importance of rotary kiln in production.

    In the application field of rotary kiln, there are a large number of rotary kilns in cement industry. The whole production process of cement is summarized as "two grinding and one burning", in which "one burning" is the process of burning raw meal prepared by grinding into clinker under the high temperature of rotary kiln. Therefore, rotary kiln is the main machine in cement production, commonly known as the "heart" of cement plant.

    In the building materials industry, in addition to calcining cement clinker, rotary kiln is also used for calcining clay, limestone and slag drying; In the production of refractories, the raw materials are calcined in rotary kiln to make the size stable, the strength increased and then processed. In nonferrous and ferrous metallurgy, iron, aluminum, copper, zinc, tin, nickel, tungsten, chromium, files and other metals are sintered and roasted in rotary kiln. For example: in aluminum production, it is used to calcine aluminum hydroxide into alumina; In ironmaking, it is used to produce pellets for blast furnace ironmaking; The foreign "SL / RN" and "Krupp" methods use them for indirect reduction of iron ore; It is used to extract tin and lead by chlorination volatilization roasting method. In the process of mineral processing, the lean iron ore is magnetized and roasted in a rotary kiln, so that the original weak magnetism of the ore is changed into strong magnetism, which is beneficial to magnetic separation.

    In chemical industry, soda is produced by rotary kiln, phosphate fertilizer and barium sulfide are calcined. In the 1960s, the United States and other countries invented a new process of producing phosphoric acid with rotary kiln. This method has the advantages of low energy consumption, less electricity consumption, no use of sulfuric acid and utilization of medium and low grade phosphate rock, and it will be popularized soon.

    In addition, in terms of environmental protection, developed countries in the world have used cement kilns to incinerate hazardous wastes and garbage for more than 20 years, which not only makes waste reduction and harmless, but also uses waste as fuel to save pulverized coal and make waste resources.
     
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