Development of a Refractory Brick Resistive to Soda Ash

抄録

The Al₂O₃-SiC-C brick (the AGS brick) is the most appropriate for the wear lining of a torpedo car for desiliconizing and dephosphorizing hot metal in the car with caustic lime and iron oxide.
When desulphurization with soda ash is further added, the Al₂O₃-SiC-C brick containing superfine silicon carbide (the AGS-UF brick) exhibits even better durability. The reason is that fine silicon carbide on the brick surface is oxidized by soda ash to silica, which very quickly reacts with materials such as alumina to form a fine-textured vitreous layer, preventing Na₂O from penetrating into the brick lining.
Of all types of refractory bricks except the AGS-UF brick, the unburnt basic brick performed best in laboratory test, but was later found unusable as it developed a deteriorated structure in field test.