What is the difference between refractory brick and refractory clay?
Firebrick is made by firing clay and stone powder in a 1300 degree kiln. Firebrick has a certain shape and size. According to the different production processes of refractory materials, the types of refractory bricks can be divided into fired bricks, unburned bricks, electric melting bricks (melting and casting bricks) and refractory and heat insulation bricks. According to different shapes and sizes, they can be divided into standard bricks, ordinary bricks, special bricks, etc.
Refractory bricks are high-temperature building materials and structural materials used in building kilns and various thermal equipment, and can withstand various physical and chemical changes and mechanical effects at high temperature, such as refractory clay bricks, high aluminum bricks, silica bricks, magnesia bricks, etc.
Refractory clay usually refers to the common folk point furnace, which is a kind of clay refractory soil used in the furnace. Clay refractory brick is a weakly acidic refractory material with good thermal stability. It is suitable for hot furnace, various boiler linings, flue and smoke chamber. Product specification form: standard shape, common special-shaped, special-shaped and special-shaped bricks.
The physical and chemical properties of clay refractory brick are about 1500 ℃ under the upper limit of atmospheric pressure. Silica brick and clay brick are used in large quantities. Silica brick is a silica product containing more than 93% SiO2. The raw materials used include silica, waste silica brick, etc. Refractory silica brick has strong acid resistance and slag erosion ability, but it is easy to be eroded by alkaline slag. Its load softening temperature is very high, which is close to its fire resistance. After repeated calcination, the volume does not shrink or even expand slightly, but the thermal shock resistance of refractory abrasive tools is poor. Silica brick is mainly used for thermal equipment such as coke oven, glass furnace and acid steel-making furnace. Clay brick contains 30% ~ 46% alumina. It takes refractory clay as the main raw material, with a fire resistance of 1580 ~ 1770 ℃ and good thermal shock resistance. It belongs to weak acid refractory, has corrosion resistance to acid slag and is widely used. It is a kind of refractory with the largest production at present.