Which Furnace Linings Will Alumina Bubble Bricks be Used for?

Alumina hollow ball bricks belong to the category of lightweight bricks, and the proportion of use is not very wide at present. Alumina Bubble Brick is an insulating refractory product made of alumina hollow ball as the main raw material. It is mainly used as the lining of high-temperature industrial kilns below 1800℃ and the thermal insulation layer of high-temperature thermal equipment.

Energy-Saving Thermal Insulation Alumina Bubble Bricks

Which Furnace Linings Will Alumina Bubble Bricks be Used for?

The manufacturing method of alumina hollow ball brick. First, the alumina raw material is put into a pouring electric furnace and melted into a liquid state. The furnace is then poured at an angle so that the solution flows out of the pouring trough at a certain rate. Then use a flat nozzle to blow the liquid flow with a high-speed air flow with a pressure of 0.6~0.8MPa to form an alumina hollow sphere. Alumina hollow spheres, sintered alumina fine powder, and binder are batched, shaped, dried, and fired in a certain proportion to obtain alumina hollow sphere bricks.

The aluminum content of the Alumina Bubble Brick is not less than 98%, the content of SiO2 is not more than 0.5%, and the content of Fe2O3 is not more than 0.2%. The bulk density is 1.3~1.4g/cm3, and the apparent porosity is 60~70%. The compressive strength is not less than 9.8MPa, the softening temperature under load (0.2MPa) is not less than 1700℃, and the thermal conductivity is 0.7~0.8W/(m.k).

Which Furnace Linings Will Alumina Bubble Bricks be Used for?

Which furnace linings will Alumina Bubble Bricks be used for? Now the proportion of refractory materials using heavy refractory bricks will be larger. However, in order to optimize the structure of some furnace types, it is necessary to reduce the weight of the furnace body. The bulk density of high temperature-resistant heavy refractory bricks is above 2.6g/cm, and the bulk density of alumina hollow ball bricks is only 1.1~1.5g/cm. Under the condition of the same cubic meter volume, the use of hollow ball bricks can reduce the weight of the kiln body by 1-2 tons.

From the perspective of cost, the price of heavy bricks and hollow ball bricks is similar, and the price of Alumina Bubble Bricks for special areas may be slightly higher than that of heavy bricks. However, in terms of weight, the use of hollow ball bricks can reduce 1-2 tons per cubic meter. Moreover, there is no need to make an insulating layer, which reduces the amount of use and saves fuel. Not only the use effect is good, but the cost is also reduced a lot.

Due to the good thermal insulation performance of the alumina hollow ball, the heat dissipation is reduced, the thermal efficiency is improved, and the energy-saving effect is up to 30%. Therefore, the high-temperature zone lined with some high-temperature kilns or the lining of shuttle kilns is all made of hollow ball bricks, which have a significant effect on lightweight use.

Alumina Bubble Bricks have high aluminum content, low iron content, and low bulk density. They are used as working layers in high-temperature areas of shuttle kilns and tunnel kilns, and can also be used as insulation layers in high-temperature areas. Which furnace linings will Alumina Bubble Bricks be used for? Alumina Bubble Bricks can be used for high-temperature energy saving (>30%) down-flame kiln, shuttle kiln, molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace, etc. By reducing the weight of the furnace body, transforming the structure, saving materials, and saving energy, obvious effects will be achieved.