Refractory brick in the kiln was infringed reason

 Refractory brick life, to discuss the cause of firebrick victims is very important. Refractory bricks often encountered in the kiln effect of the following:

      (1) High temperature corrosion

      When the calcination temperature is too high, it will constitute a brick refractory brick body softening, strength decline, the volume is unstable, and even gradually being burned, was eroded.

      (2) chemical corrosion effect

      Normal calcination, clinker temperature above 1450 ℃, about 25% of the liquid phase appears, the liquid phase is overbased, adhering to the exposed refractory bricks and refractory brick chemical reaction. The firebrick corrosion damage from the effect.

      (3) Rapid cooling, rapid corrosion

       Because of various reasons, open kiln, stop kiln, fast kiln, slow kiln, large material, small powder, low humidity, high temperature conditions are inevitable, so the hot and cold changes in the kiln also often exist. Refractory bricks are subject to temperature changes are particularly frequent, because in the calcination, refractory bricks were covered by the material, the temperature dropped out when exposed, it is subject to high temperature flame and hot air heating heating. In general, this temperature fluctuates at least once per minute, about 500,000 times a year or more. Under such circumstances, if the composition of refractory bricks is deficient, refractory bricks are easy to burst and explode. The service life is greatly shortened.

      (4) Mechanical effects of damage

      Refractory bricks are often subjected to the shock generated when the coal is burned, especially when pulverized coal is fired aggressively. In addition, the deformation of the kiln body, the center line is not positive, by rotating the gravitational effect, so that the cylinder becomes oval, causing pressure, folding, shear and other stress effects, constitute refractory brick was crushed broken or falling phenomenon.

      (5) material wear and tear damage

      Because the materials are continuously sliding and tumbling in the kiln, the collision between the material and the refractory bricks, and the dust mixed with the air flow on the refractory bricks will cause the bricks to be severely damaged and thus reduce continuously.

      Therefore, based on the damage suffered by refractory bricks in the kiln, refractory bricks for cement kilns should meet the following requirements: ① high temperature resistance, high refractoriness; ② thermal shock resistance and good stability; ③ good slag resistance, also Called strong resistance to chemical corrosion; ④ have a higher strength to resist mechanical damage; ⑤ wear-resistant function; ⑥ shape rules, refractory bricks standard and accurate scale, easy to mosaic; ⑦ fire bricks with easy hanging kiln skin Function