Introduction To Mullite Grid Brick

Introduction to Mullite Grid Brick
Mullite lattice brick is a high-performance refractory material and belongs to a type of lattice brick. Grid bricks are widely used as heat storage materials in industrial kilns such as blast furnaces and hot stoves. By regularly opening transparent grid holes on the brick body, efficient heat storage and exchange functions are achieved.
1. Core functions and applications
Its core mission is to absorb and store heat during the "burning period" of the hot blast stove, and then transfer the heat to the cold air flowing through during the "blowing period", thereby heating the cold air into thousands of degrees of hot air required for blast furnace smelting. This process can significantly reduce the energy consumption of the ironmaking process. Mullite lattice bricks are commonly used in high-temperature areas with wind temperatures above 900 ℃.
Why choose mullite material
The reason for choosing mullite as the main material is because it has excellent high-temperature performance. Compared with ordinary clay bricks, it has a higher load softening temperature (a typical specification above 1540 ℃), better high-temperature creep performance (not easily deformed at high temperatures), and stronger resistance to chemical erosion, which can meet the strict requirements of modern large blast furnaces for wind temperature. The key physical and chemical indicators of typical mullite lattice bricks are usually shown in the following table:
Typical specification values of indicator projects
Al ₂ O ∝ content 48-55%
Visible porosity ≤ 18%
Volume density ≥ 2.3 g/cm ³
Room temperature compressive strength ≥ 45 MPa
Starting temperature of load softening ≥ 1480 ℃
Fire resistance ≥ 1760 ℃
3. Structure and Design
Structurally, the design of mullite lattice bricks is exquisite. Bricks are usually equipped with multiple parallel transparent grid holes, and have positioning protrusions and grooves on the surface, which facilitate orderly and stable stacking in the heat storage chamber, forming efficient and smooth airflow channels. The aperture design of modern grid bricks is constantly optimized to pursue larger heat storage area and heat transfer efficiency.