The aluminum content of the three-level high alumina bricks currently produced is about 63%, and some have 65%. The body density is above 2.25, and the softening temperature under load is slightly lower. In terms of chemical indicators, it is only different from the second grade high alumina bricks in unit weight and load softening temperature.
The difference between three-level high alumina brick and clay brick:
The appearance color of clay bricks and third-grade high-alumina bricks is still different. Clay bricks are red-yellow, and third-grade high-alumina bricks are white and yellow.
There is a difference in weight between clay bricks and grade three high alumina bricks. The same brick type clay bricks are lighter than grade three high alumina bricks. The firing temperature is also lower by 20-30°C.
Bricks with 40-48% aluminum content are clay bricks, and the bulk density of clay bricks is between 2.1-2.15. In the case of N-1 clay bricks, some indicators are higher than third-grade high alumina bricks.
Bricks with 55% aluminum content are third-grade high-alumina bricks with a bulk density between 2.15 and 2.25. At present, due to the production area and raw materials, the aluminum content of clay bricks is about 56%. The aluminum content of the clay bricks in Xinmi, Henan is about 56%, and the body density is above 2.15, which is basically a third-grade high-alumina brick. Moreover, the firing temperature is high, and the chemical index is not lower than the third grade high alumina brick, but it is different in the load softening temperature.
