Performance and application of refractory bricks and refractory clay

Refractory bricks are refractory materials made of refractory clay or other refractory materials. The color is pale yellow or brownish. It is mainly used in smelting furnaces and can withstand high temperatures of 1,580 ° C -1,770 ° C. It is a refractory material with a certain shape and size. According to the preparation process, it can be divided into baking, non-burning brick, electric melting brick (melting brick) and fire resistant insulating brick; according to the shape and size, it can be divided into standard brick, ordinary brick and special brick. It can be used as a high-temperature building material and structural material for part-time kiln and various thermal equipment, and can withstand various physical and chemical changes and mechanical effects at high temperatures. For example, refractory clay, high alumina brick, silica brick, magnesium brick, and the like.

 

Physical and chemical properties of clay refractory bricks: The upper limit is about 1500 degrees under normal pressure, and the larger amount is silica brick and clay. Silica brick is a siliceous product containing more than 93% sio2, and the raw materials used are silica, waste silicon brick, and the like. Refractory bricks and silica bricks have strong resistance to acid slag, but are easily corroded by alkaline slag. Its load softening temperature is very high, close to its refractoriness. After repeated calcination, the volume does not shrink or even slightly expands, but the refractory material Abrasives have poor thermal shock resistance. Silica bricks are mainly used in thermal equipment such as coke ovens, glass melting furnaces, and acid steelmaking furnaces. The clay brick contains 30%~46% alumina. It is made of refractory clay as the main raw material, and has a refractoriness of 1580~1770°C. 

It has good thermal shock resistance and is a weakly acidic refractory material. It has corrosion resistance to acid slag and is widely used. It is currently the largest class of refractory materials. The main crystalline phase of neutral refractory high-aluminum products is mullite and corundum. The content of corundum increases with the increase of alumina content. Corundum products containing more than 95% alumina are a kind of high-quality refractory material with wide application. The chrome brick is mainly made of chrome ore and the main crystalline phase is chromite. It has good corrosion resistance to steel slag, but has poor thermal shock resistance and low temperature deformation temperature. The chrome-magnesia bricks supported by chrome ore and magnesia in different proportions have good thermal shock resistance and are mainly used as alkaline flat roof bricks.

 

The refractory soil usually refers to a kind of soil used for folk stoves and sets of furnaces, clay refractory soil characteristics and uses: clay refractory bricks are weakly acidic refractories, which are heat stable and suitable for hot furnaces, linings and flue. , smoke room, etc.