The brick is made from sintered special grade clay, pressed by high pressure and sintered at high temperature, with excellent spalling resistance, alkali,sodium,sulfur,chlorine and alkalic salt corrosion. Low thermal conductivity, a better and ideal choice for steel industry.
The high alumina brick feature:
high alumina bricks for steel making is made from special grade of bauxite as main raw material, added with little amount of white fused alumina and a alumina powder, shaped by high pressure and sintered at high temperature. The main mineral constituent includes mullite and corundum, with excellent high temperature physical performance and chemical resistance.
Features:
High alumina brick has the advantages of small high temperature creep, strong corrosion resistance, good thermal shock stability, etc. It is suitable for large and medium-sized hot blast stoves.
Application:
High alumina bricks are mainly used for masonry blast furnace, hot blast stove, electric furnace roof, blast furnace, rotary kiln lining. In addition, high alumina bricks are also widely used as open hearth regenerative checker bricks, plugs for pouring systems, nozzle bricks, etc.
| Items | High alumina brick | |||
| Al2O3,% ≥ | 55 | 65 | 70 | 82 |
| Fe2O3,%≤ | 2 | 2 | 2 | 2 |
| Refractoriness,SK | 36 | 37 | 38 | 40 |
| Refractoriness,ºC | 1790 | 1820 | 1850 | 1920 |
| Refractiriness 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 |