Refractory

High Aluminum Refractory Castable

  • Tuesday, 09 August 2022
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High Aluminum Refractory Castable

High aluminum refractory castable is a type of refractory material made from high-alumina aggregates. It is composed of aluminum oxide, bauxite powder, and silica fume. High-alumina refractory is widely used as the lining for various types of kilns. The high-alumina content makes the material suitable for use in extreme conditions.

The process for producing high aluminum refractory castable consists of melting temperatures over 1400 degrees, reducing the production of low melts, and increasing the refractory's thermal stability. High aluminum castable is produced from aluminum-rich bauxite clinker or refractory clay. The process for manufacturing high aluminum refractory castable uses water that is half that required for ordinary concrete.

The process for manufacturing high aluminum refractory castable differs from that for general refractory. Unlike general refractory castable, the low-alumina castable uses superfine powder as the cultivation substrate. It also combines a late-acting coagulant and microanalysis dispersant. Besides being easy to use, high-alumina refractory castable has excellent thermal shock and corrosion resistance.

During the production process of high aluminum refractory castable, alumina mud must be stirred properly. Manual mixing is prohibited. The resulting slurry must be used within 30 minutes. Any castable with condensation must be disposed of immediately. The casting body must not be too thick or too thin. It is important to check the heating rate and baking time of the high aluminum refractory mud before pouring.

Rongsheng refractory bricks manufacturer can deliver finished castables to your desired location. It can be produced through liquid mixing, vibration forming, and curing. This refractory manufacturer has a 20-year history of quality assurance. The company also has two professional refractory brick production lines. Its amorphous refractory brick production lines are renowned worldwide.

In addition to the refractory cement, high-alumina cement contains a small amount of calcium. Because high-alumina cement contains a large portion of aluminum, it has a low effect and has a low calcium content. Low-alumina cements have lower calcium content and have better strength. Both types of cement contain different amounts of alumina in the raw materials. This means that they are better for early use than high-alumina cement.

The working property of high alumina bricks depends on its content in AL2O3. The higher the percentage of AL2O3 in a mullite-corundum product, the higher the softening temperature under load. While high-alumina bricks with an Al2O3 content of 70 to 90% don't change significantly, the composition of Fe2O3 and TiO2 in the raw material changes. This changes the properties of the high-temperature liquid phase.

The phase composition of high-alumina bricks is closely related to its thermal shock resistance. It can be enhanced through production measures. The particle composition of the mud can be adjusted and the product's particle structure can be improved. Zircon micro powder and synthetic cordierite can be added to the ingredients. By using these methods, high-alumina products can achieve a high thermal shock stability. These high-alumina bricks are made of highly-alumina bauxite.

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