Corundum bricks: extending the lifespan of cement rotary kilns

Corundum bricks are the core refractory material for key components of cement rotary kilns. A thorough understanding of the properties of corundum bricks and their appropriate selection is of great significance for cement rotary kilns.

1.Harsh operating conditions of cement rotary kilns

The temperature in the firing zone of a cement rotary kiln can reach over 1700℃, accompanied by intense scouring of clinker dust and chemical erosion by alkaline gases.

Ordinary refractory bricks are prone to melting and spalling under these conditions. Therefore, high-performance refractory materials are needed at this time.

In addition, the kiln rotates at high speeds, so the refractory bricks also need to have good thermal shock stability.

Therefore, the selection of refractory materials should not only consider temperature resistance, but also corrosion resistance and mechanical strength. Only in this way can the long-term stable operation requirements of cement rotary kilns be met.

2.Characteristics and advantages of corundum bricks

Corundum refractory bricks are made primarily of corundum as the main crystalline phase, and the materials used for these bricks are usually fused white corundum or tabular corundum. Therefore, it has extremely high fire resistance and high-temperature strength.

Characteristics of corundum bricks

① Excellent resistance to alkali corrosion;

② Good wear resistance;

③ Excellent thermal shock resistance.

These characteristics make it particularly suitable for the firing and transition zones of cement rotary kilns.

Meanwhile, these refractory bricks do not readily react with cement clinker at high temperatures. Therefore, it can effectively reduce kiln lining detachment and brick damage.

In addition, these fire bricks have moderate thermal conductivity, which can protect the kiln body without affecting the efficiency of heat utilization.

3.Brick type selection and price considerations

There are various types of these bricks on the market, such as AZS bricks and corundum mullite bricks. Different types of corundum bricks are suitable for different parts of a cement rotary kiln.

Therefore, users need to select the appropriate model based on the specific operating conditions of the kiln.

Generally, high-purity corundum bricks can be used in the middle of the firing zone, while corundum composite bricks can be used in the transition zones on both sides. This ensures both performance and cost control.

In addition, the price of these bricks is greatly affected by the quality of raw materials, production process and brand. Therefore, when purchasing, one should not only look at the unit price, but also take into account the service life and cost performance.

In addition, working directly with a reliable refractory brick manufacturer usually yields more reasonable prices and more consistent product quality.

When selecting a fire brick manufacturer, it is recommended to examine its production qualifications, technical strength, and after-sales service capabilities to ensure that the cement rotary kiln receives long-term and reliable protection.

Henan Ruitai Lianxin Refractory Materials Co., Ltd. has been focusing on refractory materials for 20 years. We can not only provide customers with high-quality refractory bricks that meet the required standards, but also provide the most suitable kiln operating conditions solutions.

Please feel free to contact us if you have any needs. Choosing Ruitai Lianxin means choosing strength.