The kiln body uses refractory bricks, such as:
1. Magnesia bricks. The magnesium oxide content of magnesia bricks is not less than 91, the calcium oxide content is not more than 3, and periclase is used as the material. Alkaline refractory products based on major minerals.
2. Magnesium-alumina spinel bricks. Magnesia-alumina spinel bricks are produced by adding alumina to the ingredients in order to improve the thermal shock stability of magnesia bricks. Mineral magnesia bricks.
3. Ordinary magnesia-chrome bricks Magnesia-chrome bricks contain MgO55-80 Cr2O3≥8. The main minerals are periclase and chromium spinel, and the silicate phases are forsterite and forsterite.
As the main insulation material of the rotary kiln, refractory castables can be properly configured to protect the normal operation of production equipment at high temperatures and effectively reduce system energy consumption.
For some large-scale rotary kilns, the heat load on the lower part of the kiln head cover is relatively high. If the general high-aluminum refractory castables are not cured and the temperature is not controlled well, they are prone to bursting and falling off; the top of the kiln head cover is close to three times At the air duct, the dust-laden airflow erosion is relatively serious. These two parts use high-strength wear-resistant castables with good high-temperature performance, strong thermal shock resistance and wear resistance.
Extended information
The quality of the refractory materials of the rotary kiln is related to the overall production quality of the rotary kiln. The quality of the refractory materials of the rotary kiln depends on the choice of raw materials. The selection of the refractory materials of the rotary kiln needs to be determined according to the temperature, chemical properties and other conditions of the calcined materials. Some substances require ultra-high temperature calcination, so choose refractory materials. Ordinary refractory materials cannot be used; some calcined materials are highly corrosive, requiring refractory materials with strong anti-corrosion properties.
In order to increase the service life of the lining, in addition to selecting appropriate refractory materials, it is also necessary to improve kiln building technology, as well as kiln lining maintenance and repair technology.
HowNet—Refractory materials for cement rotary kiln