Clay bricks for blast furnace refer to the clay bricks used for the lining of blast furnaces.  Blast furnace clay bricks are used for the throat, shaft, hearth and bottom of the lining of small blast furnaces. In the 1990s, clay bricks were used for large blast furnace shafts, and the rest were replaced by high alumina bricks, silicon carbide bricks and carbon bricks, and the proportion of blast furnace clay bricks gradually decreased. Physical and chemical properties of blast furnace clay bricks: Al2O3≥42%; Fe2O3≤1.7%, refractoriness greater than 1750℃.

 

The blast furnace clay brick has high compressive strength at room temperature and can resist the long-term operation wear of the charge; small volume shrinkage under high temperature and long-term operation; it is beneficial to maintain the integrity of the furnace lining; low apparent porosity and Fe2O3 content reduce carbon deposition in pores It makes the bricks expand and loose and damage during use; the formation of low melting point substances is less, so that the blast furnace clay bricks have better performance than ordinary clay bricks. It is basically the same as the production process of clay bricks. Al2O3≥38%, Fe2O3≤2% in bound clay.

Iron should be removed during raw material crushing, pulverization and mud preparation. Use mixed fine powder, mud, pulp waste liquid as binder. Using high tonnage brick press, the molding pressure is greater than 50MPa. The bulk density is greater than 2.38g/cm3. Firing temperature 1380-1400℃.

 

Blast furnace clay bricks are used for the throat, shaft, hearth and bottom of the lining of small blast furnaces. In the 1990s, clay bricks were used for the shaft of large blast furnaces, and the rest were replaced by high alumina bricks, silicon carbide bricks and carbon bricks, and the proportion of blast furnace clay bricks gradually decreased.