What is the principle of selection of refractory materials for cement rotary kiln?

How to choose refractory materials for cement rotary kiln?

Cement rotary kiln is the most advanced rotary kiln on the market. After years of technological innovation, breakthroughs have been made in the equipment of rotary kiln calcination system, and rich experience has been accumulated in the selection of refractory materials.

The principles for selecting refractory materials for cement kiln systems are as follows

1 Select refractory materials according to the production method and kiln type

2 Select refractory materials according to the specifications of the kiln.

3 Select refractory materials according to the properties of the raw materials and fuels used.

4. Select refractory materials according to the heat load in the dense.

5. Select refractory materials according to the stress distribution and thermal distribution in the kiln.

Advantages of silica molybdenum brick for cement rotary kiln

Silica mullite bricks, which has the homophony of "wear resistant brick", was once called HMS high wear resistant brick, and its wear-resistant coefficient is more than five times higher than that of phosphate-bonded high-alumina brick. In terms of its phase composition, it is a silicon carbide-silicon mullite product, referred to as a silica mullite brick. In recent years, silica molybdenum bricks have been widely used in cement rotary kilns, especially the emergence of new dry method and the large-scale, dense rotating speed,

The thermal stress intensity in the kiln is greatly improved, which puts forward new and higher requirements for the material and physical and chemical properties of the refractory. Therefore, the cement rotary kiln is still using magnesia-chrome bricks under the protection of the kiln skin in the firing zone, and the secondary firing zone, transition zone, and cooling zone are changed to silica molybdenum bricks, and the effect is obviously better than that of magnesia-chrome bricks.

1) The product has a dense structure and good wear resistance

The main crystalline phase of Silica mullite bricks is composed of mineral corundum (Mohs hardness 9.0~9.2), silicon carbide (Mohs hardness 9.0~9.5) and mullite (Mohs hardness 7.0~75) with high hardness. The bulk density is generally 2.7~3.0g/cm3. The normal temperature wear resistance of refractory materials depends on its strength and the compactness of the structure. Materials with high strength and compactness have better wear resistance. The lining of cement rotary kiln is subject to long-term wear resistance of materials. Rolling friction and wear are one of the main reasons for the damage of the refractory lining. The density, strength and wear resistance of Silica mullite bricks are significantly better than those of anti-stripping high-alumina bricks and magnesia-alumina spinel bricks. The secondary firing belt, filter belt and other parts have good use effect, and it can be said that good wear resistance plays a very important role.