Refractory
High Alumina Refractory Bricks
High Alumina Refractory Bricks
High alumina refractory bricks are bricks that contain at least 50% of alumina. They are made by using a moist refractory starting material and adding finely divided alumina as a binder. These bricks may also contain slaked lime, magnesia, or silicon dioxide. These bricks can then be subjected to hydrothermal treatment to form boehmite.
High alumina bricks have different mechanical properties and are used in applications that use corrosive or abrasive chemicals. They are ideal for industrial plants and laboratories because they last longer and are more energy efficient than conventional bricks. These bricks can withstand temperatures up to 1,200 °F and are suitable for a range of processes. For this reason, high alumina bricks are highly valued in the refractory industry.
In the past, refractory bricks were almost exclusively made from silica or fireclay shapes. However, this has changed in recent years. Today, high alumina bricks are made from materials with higher purity alumina, such as Missouri diaspore clays.
High alumina bricks can crack if they are not fired properly. This can happen for several reasons, including insufficient heating time, insufficient holding time, or cold air leaching from the combustion chamber. High alumina bricks that are under-fired also have a low mechanical strength and low apparent porosity. Cracks can also occur in a high-alumina brick that is over-fired. When this occurs, the bricks lose their high temperature performance, and they can also experience volume expansion and shrinkage.
Compression strength of three commercial aluminasilicate bricks was measured at different temperatures. These results were used to determine their Young's modulus in compression. The data was then used in numerical modelling of a hot rotary kiln lined with bricks. Using a finite element method, the brick lining was modeled at various load states. The objective was to assess the reliability of the model and to provide insight into the levels of stress.
High alumina refractory bricks have different ingredients. The primary raw material is diaspore clay, which is mined in the South Central Missouri district. These deposits are limited in size and will soon be exhausted. Other alternatives, such as bauxite, kyanite, and Georgia kaolin, have been proposed.
High alumina refractory bricks are a common material used in blast furnaces. They contain high alumina content and have good thermal stability. High alumina bricks are commonly used in the blast furnace, cement revolver, and masonry steel-making industry. In addition, these bricks also exhibit good thermal shock resistance.
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