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Main requirements of Rotary Kiln for Kiln Brick

 
1. The firing condition of high temperature resistant pipe in kiln is above 1000 ℃, which requires that refractory brick can not be melted at high temperature, and the strength should be maintained at the melting point. At the same time also have long exposure to high temperature still have fixed volume and other characteristics.
 
2. Good thermal stability, that is, resistance to drastic changes in kiln temperature without being destroyed. Under the condition of unstable operation condition of stop kiln, open kiln and rotary kiln, the temperature change in kiln is relatively large, which requires that the kiln brick can not be cracked or spalling under the condition of drastic change of temperature. This also requires that the kiln temperature in operation as much as possible to stabilize some.
 
3. When the chemical erosion resistance is strong in the rotary kiln, the ash, slag and steam will cause great erosion to the kiln brick.
 
4. The sliding of the feed in the kiln with good wear resistance and mechanical strength and the friction of the dust in the air flow can cause great wear on the kiln brick. especially in the early stage of the opening kiln. The kiln brick is also subjected to the expansion stress at high temperature and the stress caused by the elliptical deformation of the kiln shell. The kiln brick is required to have a certain mechanical strength.
 
5. Kiln brick has good performance of hanging kiln skin. If the kiln brick has good property of hanging the kiln skin and the kiln skin can be maintained for a long time, the kiln brick will not be eroded and worn.
 
6. Low porosity, if the porosity is high, can cause a corrosive kiln gas to penetrate into the kiln brick to be condensed, and the kiln brick, in particular the alkaline gas, is destroyed.
 
7. Thermal expansion is better for stability. The thermal expansion coefficient of kiln shell is larger than that of kiln brick. However, the kiln shell temperature is generally about 280-450 ℃, while the kiln brick temperature is generally above 800 ℃, and the temperature in the firing zone is more than 1300 ℃. In this way, the thermal expansion of kiln bricks is larger than kiln shells. Kiln bricks are easy to be peeled off by compressive stress.
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