What are the differences between different grades of alumina lining brick?

Alumina lining brick is a common refractory material, mainly made of high-purity alumina as the main raw material, with the appropriate amount of other additives added, and formed, dried, and sintered at high temperatures. According to different alumina content and physical properties, cărămizi înalte de alumină can be divided into different grades. High alumina bricks include first-grade high alumina bricks, second-grade high alumina bricks, and third-grade high alumina bricks. What is the difference between them?

Differences between different grades of alumina lining brick

Different alumina content

The alumina content of the first-grade high alumina brick is greater than 75%, the alumina content of the second-grade high alumina brick is between 60%-75%, and the alumina content of the third-grade high alumina brick is between 48%-60%.

Different compressive strength

Due to the different alumina contents, the first-grade high alumina bricks are relatively hard and have a greater compressive strength, which can reach 100-150MPa; the second-grade high alumina bricks have a lower compressive strength, which is about 80-100MPa; the third-grade high alumina bricks have the lowest compressive strength, which is generally below 70MPa.

Different refractoriness

Due to different alumina contents, the first-grade alumina lining brick has the highest refractoriness, which can reach above 1790℃; the second-grade alumina lining brick has the second highest refractoriness, which can reach above 1750℃; the third-grade aluminum oxide bricks have the lowest refractoriness, which is generally below 1700℃.

Different uses

Due to the differences in alumina content and physical properties, different grades of high-alumina bricks are also different in use. Grade one high-alumina bricks are mainly used in high-temperature industrial equipment such as high-temperature furnace linings, electrolytic cells, desulfurization equipment, etc.; Grade two high-alumina bricks are widely used in various crucibles, glass kilns, cement kilns and other fields; Grade three high-alumina bricks are mainly used in industrial equipment with lower temperatures.