High alumina brick is a type of refractory brick product made from bauxite as raw material, mainly composed of AL2O3 as the main crystal form. It is made by selecting materials, batching, making green bodies, and high-temperature sintering between 1550 ℃ and 1700 ℃.
The chemical composition and physical properties of bauxite, as a raw material for high alumina bricks, vary greatly due to its colloidal mixture of iron containing substances and aluminum hydroxide in the early stages of forming the ore structure.
Is the molecular formula of monohydrate alumina Al2O3? H2O is a white flake shaped rhombic crystal with a hardness of 7 and a density of 3.5g/cm3. The main mineral of Chinese bauxite is a mixture of diaspore and kaolinite. Other secondary minerals include boehmite, dickite, aluminite, rutile, and iron containing minerals, with generally high Al2O3 content and low Fe2O3 content, resulting in a decrease of about 14% in ignition. The ore is very hard and not easily broken.
Is the molecular formula of alumina Al2O3? 3H2O, which is more pronounced in crystallization than monohydrate alumina. Usually forming blocky nodules with smooth cross-sections and a density of 2.4g/cm3. There is a heating shrinkage similar to that of ball clay. Pure alumina has a melting point of 2035 ℃ and is also a good refractory raw material.
[Introduce some professional knowledge on porosity of high alumina bricks]
What is the porosity of high alumina bricks? The apparent porosity of high alumina bricks is also known as the open porosity. The percentage of the volume of open pores in refractory products to the total volume of the product. Unless otherwise specified, the porosity referred to in the Chinese refractory industry usually refers to the apparent porosity.
The apparent porosity is an important indicator for evaluating the quality of refractory raw materials or products, which not only reflects the density of refractory materials, but also characterizes whether their manufacturing process is reasonable. Except for lightweight refractory products, low porosity raw materials or products are beneficial for improving product quality, enhancing mechanical strength, reducing surface area in contact with slag, and improving service life
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