Andalusite Brick

Andalusite bricks are made of kaolin, serpentine and other refractory materials as the main raw materials, which are mixed, molded and fired at high temperature. The main varieties include banshangshi andalusite refractory bricks, fire-cutting class andalusite refractory bricks, banshang andalusite refractory bricks, angle rotation andalusite refractory bricks, 1900 class andalusite refractory bricks for boilers, etc.

Andalusite brick generally have a low thermal expansion rate during the conversion process, and there are two types, one is fired andalusite refractory bricks, and the other is unfired andalusite  refractory bricks.

Andalusite refractory bricks use corundum, andalusite as the main raw materials and strictly control the particle size of the raw materials. It adopts a new process, adopts multi-stage ingredients, matrix homogenization, and determines the best calcination temperature, etc., and has excellent performance andalusite brick. It can fully meet the use of different parts of blast furnace and hot blast stove and different working environments

Product parameters:

1.Bulk density: ≥2.3g/cm³

2. Compressive strength: ≥40MPa

3.Refractoriness: ≥1750℃

4. Thermal conductivity: ≤1.3W/(m·K)

5. Weight: 2.6kg/piece

Andalusite refractory bricks will be converted into mullite by heating, and after conversion, they will have higher fire resistance. The refractoriness can reach above 1800℃, and the andalusite brick contains few impurities, and the high temperature strength decreases very little. It is also resistant to rapid cold and rapid heat, high mechanical strength, strong thermal shock resistance, strong slag resistance, high load conversion point, and has extremely high chemical stability (even insoluble in hydrofluoric acid) and strong resistance to chemical corrosion sex.

Andalusite is used in industry mainly for its high temperature resistance. After andalusite is heated to 1350°C under normal pressure, it begins to transform into acicular mullite. Mullite crystals are the only stable form of aluminosilicate under the action of high temperature.

During the production process, the application of andalusite raw materials is also very important. In order to prevent the product from shrinking at high temperatures, a certain amount of andalusite is added during the batching to make andalusite appear stable in volume at high temperatures.
During the use of andalusite, such as the constant observation of the iron ladle, it can completely resist extremely cold and extremely hot temperature changes. Especially when it penetrates into molten iron, it can prevent cracks and peeling. Ensure that the volume is stable during use and improve the performance of non-shrinkage.

Andalusite brick can be used in key parts such as hot blast stoves and hot blast towers, as well as various auxiliary pouring and operating equipment, and can also be used to make furnace facilities, high-temperature aluminosilicate insulators, and sand moulding fabrics.

Because andalusite refractory bricks have good high temperature, acid and alkali resistance, thermal conductivity and other advantages, they are widely used in steel, chemical, construction and other industries. For example, in steel plants and aluminum plants, it is used as a material for the walls of high-temperature equipment and the structure of furnace bodies;
In petrochemical, coal chemical and other industries, it is used as the lining and furnace of reactors, furnaces, hydrogenation catalytic separation systems and other equipment;
Andalusite refractory bricks are also widely used in various boilers, heat treatment furnaces and other equipment, becoming an indispensable building material in these industries.

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