The main components of high alumina castables

High alumina castable is a commonly used refractory material, mainly composed of the following components:

1. High alumina aggregate

The main component of high alumina castable is high alumina aggregate. High alumina aggregates are usually made from raw materials rich in alumina (Al2O3), such as kaolin, bentonite, clay, etc. The alumina content of high alumina aggregate is usually above 50%, which can provide good fire resistance and wear resistance.

2. Binder

In order to make the high alumina castable have a certain fluidity and plasticity, a certain proportion of binder needs to be added. Common binders include water glass, silicate glue, etc. The role of the binder is to provide the cohesive force and curing ability of the castable to ensure that the castable can be firmly attached to the surface of the furnace body.

3. Additives

In order to improve the performance of high alumina castables, some special additives can be added. For example, fine powdered alumina, silicon nitride, etc. can be added to increase refractoriness and corrosion resistance; or fiber materials such as ceramic fibers, metal fibers, etc. can be added to enhance the toughness and shock resistance of the castable.

4. Water

Water is the solvent and flow medium in high alumina castables. An appropriate amount of water forms a colloid after reacting with the binder, and makes the castable easy to construct and shape by providing fluidity and plasticity.

High-alumina castables are widely used in various high-temperature industrial furnaces due to their high refractoriness, good wear resistance, and strong corrosion resistance. It plays an important role in metallurgy, chemical industry, electric power and other industries, and is often used for lining and repairing furnace drums, furnace walls, furnace bottoms, furnace roofs and other parts. By rationally adjusting the ratio of high alumina aggregate, binder and additives, high alumina castables with different properties can be obtained to meet the requirements of various process conditions and use environments.