The manufacturing process of high alumina brick mainly includes the following key steps:

I. Preparation of raw materials

The main raw materials of high-alumina brick include high-alumina bauxite and high-purity alumina powder. These raw materials need to be calcined at high temperature to form clinker. Clinker should be strictly sorted and screened to remove iron before crushing, so as to remove impurities and ensure the purity of raw materials.

II. Ingredients and mixing

Mix the processed clinker with other auxiliary raw materials (such as bonded clay, wetting agent, etc.) in a certain proportion to ensure uniform mixing and control particle size distribution. This process is very important to ensure the quality of high alumina bricks.

III. Molding

The mixed raw materials are pressed by a hydraulic forming machine to obtain a green brick with a certain shape and size. In the molding process, the proportion of clinker can be as high as 90% ~ 95%, which is helpful to improve the strength and fire resistance of brick blank.

IV. Drying

The formed brick needs to be dried to remove the internal moisture and improve the strength of the brick. The drying process is usually carried out in the low-temperature preheating section of tunnel kiln.

V. Firing

The dried green bricks are sent to a kiln for high-temperature firing. The firing temperature is generally 1500℃ ~ 1600℃. In the sintering process, the gradient sintering process ensures the complete development of mullite crystal phase and forms a stable three-dimensional network skeleton.

VI. Inspection and packaging

After firing, the high alumina brick needs strict quality inspection to ensure its performance meets the standard. The qualified products will be packaged and ready to leave the factory.

The whole manufacturing process of high-alumina brick needs to strictly control each link to ensure the quality and performance of the final product.