Service temperature and service life of refractory bricks

I. Service temperature of refractory bricks

The service temperature range of refractory bricks varies with different types and compositions. The following are the service temperature ranges of common refractory bricks:

Aluminosilicate brick: The maximum service temperature is usually around 1350℃.

High-alumina brick: the alumina content of the first-grade high-alumina brick is more than 75%, and it can withstand high temperature as high as 1790℃.

Silicon carbide brick: it can be used in the range of 1300℃-1500℃ and has the characteristics of high temperature resistance, wear resistance and corrosion resistance.

Zirconia brick: It can be used in extremely high temperature environment above 2000℃ and has good insulation and wear resistance.

Lightweight heat-insulating firebrick:

Diatomite thermal insulation refractory brick: applicable temperature is 1000-1200℃.

Light Mullite insulating brick: The service temperature can reach 1650-1800℃.

Calcium feldspar light insulating brick: Suitable temperature is 1100-1300℃.

II. Service life of refractory bricks

The service life of refractory bricks is influenced by many factors, including material quality, service environment, operating conditions and maintenance measures. The following are the service life in different application scenarios:

(1) Cement rotary kiln:

Sintering zone: the service life of magnesia-spinel brick is generally 1-2 years.

Transition zone: the service life of silica brick can reach 3-5 years.

Safety belt: The service life of high-strength alkali-resistant brick is 1-2 years.

The overall service life is generally 2-5 years.

(2) Steel industry:

Ladle lining: By adding impermeable coating, the service life can be increased by 30%-50%.

Ironmaking blast furnace: The service life of refractory bricks is generally 3-5 years.

(3) Glass melting furnace:

Insulating brick made of light mullite: The service life can reach more than 3 years.

(4) Other high-temperature equipment:

Gasifier: The service life of refractory bricks is generally 1-2 years.

General industrial furnaces: high-quality refractory bricks can be used for decades at around 300℃, and the service life of ordinary refractory bricks is 5-10 years.

III. Factors Affecting the Service Life of Refractory Bricks

Material quality: the service life of high-quality refractory bricks is significantly longer than that of ordinary refractory bricks.

Temperature management: avoid long-term over-temperature operation and frequent temperature fluctuations.

Chemical attack: avoid the attack of slag, molten metal or harmful gas.

Mechanical impact: reduce material impact and wear.

Maintenance measures: regularly check, repair and clean up the accumulated slag.

The service life of refractory bricks can be significantly prolonged and the replacement cost can be reduced by reasonably selecting the types of refractory bricks, optimizing the use environment and strengthening daily maintenance.