Views: 0 Author: Site Editor Publish Time: 2022-05-16 Origin: Site
Rotary kiln refers to rotary calcining kiln (commonly known as rotary kiln), which belongs to building materials and equipment. Rotary kiln can be divided into cement kiln, metallurgical and chemical kiln and lime kiln according to different materials. Cement kilns are mainly used to calcine cement clinker, which are divided into dry cement kilns and wet cement kilns. Metallurgical and chemical kilns are mainly used for magnetization roasting of lean iron ore in iron and steel plants in metallurgical industry; Oxidation roasting of chromite and nickel iron ore; Roasting high alumina vanadium earth ore in refractory plant and roasting clinker and aluminum hydroxide in aluminum plant; The chemical plant roasts chromium ore sand, chromium ore powder and other minerals. Lime kiln (i.e. active lime kiln) is used to roast active lime and light burned dolomite used in iron and steel plants and ferroalloy plants. Rotary kilns are divided into variable diameter rotary kilns and full diameter rotary kilns according to their appearance. They can be divided into cement rotary kilns, ceramsite sand rotary kilns, kaolin rotary kilns, lime rotary kilns, etc. according to different energy supply effects, they can be divided into gas rotary kilns, coal rotary kilns and mixed fuel rotary kilns.
Rotary kiln is widely used in many production industries such as building materials, metallurgy, chemical industry and environmental protection to mechanically, physically or chemically treat solid materials. This kind of equipment is called rotary kiln. The application of rotary kiln originated from cement production. In 1824, British cement worker J asper invented the earth shaft kiln with intermittent operation; In 1883, Deutsch invented the multi-layer shaft kiln with continuous operation; In 1885, the British eransome invented the rotary kiln and put it into production after obtaining patents in Britain and the United States, which soon achieved considerable economic benefits. 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. In the application field of rotary kiln, the cement industry has the largest number.
In nonferrous and ferrous metallurgy, iron, aluminum, copper, zinc, tin, nickel, tungsten, chromium, file and other metals take rotary kiln as smelting equipment to sinter and roast ores, concentrates and intermediates. For example, it is used to roast aluminum hydroxide into alumina in aluminum production; In ironmaking, it is used to produce pellets for blast furnace ironmaking; Foreign "SL / RN method" and "Krupp method" use it for direct reduction of iron ore; It is used to extract tin and lead by chlorination volatilization roasting method. Weak magnetism is used in rotary kiln to change the original magnetization of iron ore during beneficiation. In the chemical industry, the rotary kiln is used to produce soda, calcine phosphate fertilizer, barium sulfide, etc. In the 1960s, lapple and others in the United States invented a new process for producing phosphoric acid in rotary kiln. This method has the advantages of low energy consumption, less power consumption, no sulfuric acid and the use of medium and low-grade phosphate rock. It is soon popularized. Ring formation often occurs in the production of rotary kiln. Most of them use the method of shutdown and manual cleaning, but it affects the production and increases the production cost. The newly developed rotary kiln ring cleaning machine avoids this phenomenon. It can deal with the phenomenon of ring formation well.