High alumina brick
High alumina barick usually refers to the firebrick with Al2O3 content above 48%, the main raw material is natural bauxite, in the high aluminum clinker to add soft or semi-soft clay as a binding agent to start mixing ingredients, then through molding and drying, and finally fired. The refractoriness of high alumina bricks is around 1770, and the load-softening temperature is 1420-1550. Common high alumina bricks include sk36,sk38,sk40,etc.
High Alumina Brick Application
The inner lining of metallurgical kilns such as blast furnaces, hot blast stove, ladle.
Physical and chemical indexes of high alumina brick：
| Item | High alumina brick | |||
| SK36 | SK37 | SK38 | SK40 | |
| Al2O3，% ≥ | 55 | 65 | 70 | 82 |
| Fe2O3，%≤ | 2 | 2 | 2 | 2 |
| Max Serivice Temperature,℃ | 1350 | 1350 | 1400 | 1450 |
| Softening Temperature under load，0.2Mpa | 1450 | 1480 | 1530 | 1600 |
| Apparent Porosity，% ≤ | 20-23 | 20-23 | 20-22 | 18-20 |
| Bulk density，g/cm3 | 2.25-2.4 | 2.3-2.5 | 2.4-2.6 | 2.5-2.7 |
| Cold crushing strength，Mpa ≥ | 45 | 50 | 60 | 70 |
