The service life comparison between refractory bricks and high alumina bricks needs to comprehensively consider many factors, including material characteristics, use environment, construction quality and maintenance. The following is a detailed comparison between the two:

I. Material characteristics

(1) Refractory bricks:

Composition: It is usually made of clay, silicate and other materials, and the content of alumina (Al₂O₃) is generally 30%-48%.

Fire resistance: generally at 1580℃-1750℃.

Service life: in the medium and low temperature environment (such as below 900℃), the service life is long, up to 5-6 years.

(2) High alumina brick:

Composition: Mainly made of high-alumina bauxite, the alumina content is usually above 48%, and the alumina content of some high-alumina bricks can reach above 75%.

Fire resistance: The fire resistance is high, usually above 1770℃.

Service life: in high temperature environment (such as above 1300℃), the service life is generally 2-3 years. For example, the service life of high-alumina bricks can reach more than 3 years in high-temperature areas such as cement kiln firing zone.

II. Use environment

(1) Refractory bricks:

Application scenario: it is suitable for middle and low temperature areas, such as lining, flue and heating furnace of industrial furnaces.

Corrosion resistance: it has good corrosion resistance to acidic and neutral slag, but poor alkali resistance.

(2) High alumina brick:

Application scenario: suitable for high temperature areas, such as blast furnace, hot blast stove, electric furnace top, cement kiln firing zone, etc.

Corrosion resistance: strong acid and alkaline corrosion resistance, especially in high temperature environment.

III. Construction and maintenance

(1) Refractory bricks:

Construction requirements: Pay attention to the control of brick joints during construction. Generally, the brick joints should be controlled at 1.5mm-2mm-2 mm..

Maintenance: Check and clean up the accumulated slag regularly to avoid the damage of refractory bricks caused by accumulated slag.

(2) High alumina brick:

Construction requirements: During construction, it is necessary to ensure that brick joints are tightly packed and expansion joints are properly handled.

Maintenance: In high temperature environment, special attention should be paid to the uniformity of temperature to avoid damage caused by thermal shock.

IV. Comparison of service life

(1) Refractory bricks:

Service life: in the medium and low temperature environment, the service life is long, which can reach 5-6 years.

Influencing factors: mainly affected by temperature, chemical erosion and mechanical impact.

(2) High alumina brick:

Service life: In high temperature environment, the service life is generally 2-3 years. However, under optimized conditions (such as cement kiln firing zone), the service life can reach more than 3 years.

Influencing factors: mainly affected by high temperature, thermal shock, chemical erosion and mechanical impact.

V. Summary

Refractory bricks are more suitable for medium and low temperature environment, with longer service life, but poor alkali resistance.

High alumina brick is more suitable for high temperature environment and has strong corrosion resistance, but its service life is relatively short, so attention should be paid to the maintenance of thermal shock and high temperature environment.

The specific choice of material needs to be decided according to the actual use environment and demand.