Product Description of Low Porosity Refractory Bricks Produced By Rongsheng Refractory For Blast Furnace
The furnace shaft is an essential part of the blast furnace, playing a role in heating, reducing, and slag formation of the furnace charge. It continuously endures the impact of gas flow and material flow. However, the upper and middle sections of the furnace shaft experience lower temperatures (400–800°C), where no slag formation or slag erosion occurs. This area mainly withstands the impact of the furnace charge, the abrasion from rising furnace dust, or thermal shocks (up to 50°C/min), as well as potential damage from infiltration by alkali, zinc, or carbon deposits. Therefore, this section primarily uses low-porosity clay bricks and high-alumina bricks.
The low-porosity refractory bricks produced by Rongsheng Refractory also include mullite bricks, corundum-mullite bricks, sillimanite bricks, and andalusite bricks.
| Article | 75% Mullite Brick | 70% Mullite Brick | 65% Sillimanite Brick | 60% Sillimanite Brick | 55% Sillimanite Brick | Andalusite Brick |
|---|---|---|---|---|---|---|
| Al₂O₃% | ≥75 | ≥70 | ≥65 | ≥60 | ≥55 | ≥53 |
| SiO₂% | ≤23 | ≤25 | ≤32 | ≤37 | ≤42 | – |
| Fe₂O₃% | ≤0.5 | ≤0.8 | ≤1.0 | ≤1 | ≤1.5 | ≤1.7 |
| TiO₂% | – | – | – | – | – | ≤0.6 |
| K₂O + Na₂O% | – | – | – | – | – | ≤0.6 |
| Bulk Density (g/cm³) | ≥2.7 | ≥2.6 | ≥2.5 | ≥2.3 | ≥2.3 | ≥2.4 |
| Porosité apparente (%) | ≤18 | ≤18 | ≤18 | ≤19 | ≤20 | ≤20 |
| Cold Crushing Strength (MPa) | ≥80 | ≥65 | ≥60 | ≥60 | ≥50 | ≥60 |
| Refractories Under Load (°C, 0.2MPa, 0.6%) | ≥1680 | ≥1680 | ≥1650 | ≥1600 | ≥1580 | ≥1600 |