Cement rotary kiln is a high-temperature calcining equipment used to produce cement clinker. Under high temperature environment, the lining material of the rotary kiln needs to have excellent refractory performance and corrosion resistance to ensure the stable operation and long life of the equipment. Commonly used refractory materials mainly include the following:

1. Magnesia-chrome brick
Magnesia-chrome brick is a refractory material made of magnesia sand and chrome ore as the main raw materials, with excellent high temperature resistance and thermal shock resistance. The main features of magnesia-chrome brick include:

High refractoriness: Its refractoriness can reach above 1900℃, which is suitable for the burning zone area of ​​cement rotary kiln.
Strong corrosion resistance: It can effectively resist the corrosion of high-temperature slag and alkaline substances and prolong the service life.
Good thermal shock resistance: It performs well in the environment of rapid cooling and heating, and is not prone to peeling and cracking.
However, due to the environmental protection issues of chromium elements, the use of magnesia-chrome bricks is restricted in some countries and regions.

2. Magnesia-calcium brick
Magnesia-calcium brick is mainly made of magnesia sand and limestone, with good high temperature performance and resistance to alkaline corrosion. Its features include:

High refractoriness: The refractoriness is similar to that of magnesia-chrome bricks, which can reach above 1900℃.

Alkaline erosion resistance: It performs well in alkaline environments and is suitable for the firing zone and transition zone of cement rotary kilns.

Good environmental protection: Compared with magnesia-chrome bricks, magnesia-calcium bricks are more environmentally friendly and meet modern environmental protection requirements.

3. Alumina-silica refractories
Alumina-silica refractories include high-alumina bricks and clay bricks, etc. The main components are alumina and silica, and are widely used in various areas of cement rotary kilns. Its features include:

Good refractory performance: The refractoriness of high-alumina bricks is above 1700℃, and the refractoriness of clay bricks is around 1600℃.

Moderate price: Compared with magnesia-chrome bricks and magnesia-calcium bricks, alumina-silica refractories have lower costs and better economy.

Abrasion resistance and erosion resistance: It is suitable for medium-temperature areas such as the preheating zone and decomposition zone of the rotary kiln, and can effectively resist the erosion of high-temperature gases and materials.
4. Silicon carbide bricks
Silicon carbide bricks are made of silicon carbide as the main component, with extremely high hardness and wear resistance, suitable for high temperature and high wear environment. Its main features include:

Extremely high hardness and wear resistance: The Mohs hardness of silicon carbide bricks can reach 9.5, and the wear resistance is excellent.
Excellent thermal conductivity: It can quickly dissipate heat, reduce the lining temperature, and improve the thermal efficiency of the equipment.
Chemical erosion resistance: It has strong resistance to both acidic and alkaline substances and prolongs the service life.
5. Magnesium aluminum spinel bricks
Magnesium aluminum spinel bricks are made of magnesia and bauxite as the main raw materials, with excellent thermal shock stability and alkaline erosion resistance. Its features include:

Good thermal shock stability: It is not easy to crack and peel off in high temperature environment, suitable for the transition zone and cooling zone of rotary kiln.
Alkaline erosion resistance: It can effectively resist the erosion of alkaline substances and prolong the service life.
Good environmental protection: It does not contain harmful elements and meets modern environmental protection requirements.
6. Silica-Mullite Brick
Silica-Mullite brick is made of silica sand and mullite as the main components, with excellent high temperature performance and thermal shock resistance. Its main features include:

High refractoriness: Its refractoriness can reach more than 1700℃, suitable for high temperature areas of rotary kilns.
Good thermal shock resistance: Excellent performance in high temperature environment, not prone to cracking and peeling.
Abrasion resistance and erosion resistance: Suitable for medium temperature areas such as preheating zone and decomposition zone of rotary kiln.
7. Insulating refractory brick
Insulating refractory brick is mainly used for the lining of cement rotary kiln to reduce heat loss and improve thermal efficiency. Common insulating refractory bricks include lightweight clay bricks and lightweight high-alumina bricks. Its features include:

Excellent thermal insulation performance: It can effectively reduce heat loss and improve the thermal efficiency of equipment.
Light weight: It can reduce the load of equipment and extend service life.
Good refractory performance: It has good refractory performance and erosion resistance in medium temperature environment.
In general, the selection of refractory materials for cement rotary kilns needs to be optimized according to specific working conditions and requirements to ensure stable operation and long life of the equipment. The performance of refractory materials directly affects the production efficiency and economic benefits of cement rotary kilns. Therefore, factors such as refractoriness, corrosion resistance, thermal shock stability and environmental protection need to be comprehensively considered during selection and use.