There are many types of raw materials for fired bricks, and due to the different physical properties of different materials, the properties of the bricks produced are also different. Therefore, it is important to judge the material properties. After a large number of experiments, it has been found that when judging the performance of raw materials, it is usually determined whether they contain chemical components such as silicon dioxide, aluminum oxide, iron oxide, calcium oxide, etc. The following is a detailed content:
SiO2 (silicon dioxide) is the main component in fired brick raw materials, with a content between 55-70%. When the content exceeds this range, the plasticity of the raw materials greatly reduces the strength limit of the product.
The content of Al2O3 (aluminum oxide) in the raw materials of the product should be 10-20%. When it is less than 10%, the mechanical strength of the product decreases. When it is higher than 20%, although the strength of the product is high, the firing temperature is also high, the coal consumption is increased, and the color of the product becomes lighter.
Fe2O3 (iron oxide) is a coloring agent in brick raw materials, with a recommended content of 3-10%. If the content is too high, it will reduce the fire resistance of the product.
The formation of CaO (calcium oxide) in limestone (CaCO3) in raw materials should not exceed 10%. When the content of calcium oxide is greater than 15%, the sintering range will be reduced by 25 ℃, which makes the roasting operation difficult. When the particle size is larger than 2mm, it is more likely to form crispy bricks or cause product cracking, which can lead to severe deformation of the body, such as moisture absorption, loosening, pulverization, etc. The content of MgO (magnesium oxide) raw material should not exceed 3%, the less the better. Its compounds such as magnesium sulfate will produce a white frost in the product, which affects the quality of the product.
From the above content, we can see that the different main components and contents in fired bricks have an impact on the quality of brick products. Therefore, the editor reminds everyone to choose products from large brands with quality assurance to ensure product quality.