The Difference Between High Alumina Bricks and Corundum Bricks

High alumina bricks and corundum bricks are both types of refractory bricks. Generally, high alumina bricks are more widely used, and the quality and refractoriness of corundum bricks are higher than those of high alumina bricks, so they are often used on special occasions. Therefore, its application range is narrower than that of high alumina bricks. Although the application fields are different, they show their unique performance advantages in different working environments. So what are the differences between high alumina bricks and corundum bricks?

1. Composition

1. High alumina bricks are a refractory material made of high alumina bauxite as the main raw material. At present, the common ones are special high alumina bricks, first-grade high alumina bricks, second-grade high alumina bricks, and third-grade high alumina bricks.

2. Corundum bricks are refractory materials made of high-purity corundum as the main raw material. At present, the common ones are chrome corundum bricks, zirconium corundum bricks, white corundum bricks, brown corundum bricks, etc.

2. Physical and chemical indicators

1. Refractoriness

The refractoriness of high-alumina bricks is generally 1600-1780℃, while the refractoriness of corundum bricks can generally reach above 1800℃. The refractoriness of corundum bricks is higher than that of high-alumina bricks, so in some higher-temperature working environments, corundum bricks are more suitable.

2. Wear resistance

High-alumina bricks show good wear resistance under general working conditions, while corundum bricks show better wear resistance under more severe working conditions.

3. Different alumina content

The alumina content of high-alumina bricks is generally around 48%-80%, while the alumina content of corundum bricks is generally above 90%, and some high-quality corundum bricks can reach 99%.

4. Different compressive strength

The compressive strength of high-alumina bricks is generally around 50-70Mpa, while the compressive strength of corundum bricks can reach above 100Mpa.

3. Usage

High alumina bricks are often used for the lining of industrial equipment such as metallurgy and cement, while corundum bricks are more used in equipment such as glass kilns and electric arc furnaces that require higher refractoriness and wear resistance.

As a kind of refractory material, high alumina bricks and corundum bricks generally play a very important role in the construction of industrial kilns, but the price of corundum bricks is higher than that of high alumina bricks, so the choice depends on the temperature of the working environment, the nature of corrosion and the specific requirements of the equipment. Only by choosing the right one can the cost of use be reduced and the actual use needs be met at the same time.