The Manufacturing Process of High Alumina Insulating Brick

High alumina insulating bricks are also known as high alumina heat insulating bricks. It is a new type of lightweight insulating material which contains approximately 48% alumina, mullite and glass phase or corundum.

The manufacturing process of high alumina insulating bricks can be divided into 4 steps.

1) The preparation of foam

Prepare rosin foam with rosin soap and water glue. Mix the rosin foam and mud to make foam mud.

 

2) The preparation of mud

The capacity of mud should be determined based on the size of the container. The density of mud should be more than 1.05g/cm3. The moisture should be controlled between 35-37%.

 

3) Casting and molding

Cast the foam mud into the mold and smooth it aluminum sheet when it is filled. Then dry the mud and foam together. 

 

4) Drying and firing

Dry it at low temperature for one day and then for 2 days after removed from the mold. the products can be fired in the down draft kiln at 1300 degree. 

 

Light weight alumina insulating brick has such advantages as high porosity, small volume density, good insulation effect, high mechanical intensity, small thermal conductivity and long service life. For various industrial kilns & furnaces, it is a kind of essential refractory for energy saving and temperature preservation.