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Refractory bricks are a well-known refractory material that is suitable for all walks of life, especially the construction industry and is an indispensable raw material. Do we understand it deeply because it is so close to our lives?
Refractory bricks, referred to as refractory bricks, are refractory materials made of refractory clay or other refractory raw materials. In short, they are fire-resistant and high-temperature-resistant bricks. This material is light yellow or brown and is mainly used to build smelting furnaces. It can withstand high temperatures of 1580℃-1770℃. It is also called fire brick and is a refractory material with a certain shape and size. Bricks for different purposes can be made according to the raw materials used, and bricks of different shapes can be made according to the parts used.
According to the preparation process, it can be divided into sintered bricks, unsintered bricks, sintered bricks (electrically fused bricks), and refractory insulation bricks. According to the shape and size of refractory bricks, they can be divided into standard bricks, ordinary bricks, and special bricks. High-temperature building materials and structural materials such as refractory clay bricks, high-alumina bricks, silica bricks, and magnesia bricks can be used as building kilns and various thermal equipment and can withstand various physical and chemical changes and mechanical functions at high temperatures.
Refractory bricks are products with good density and strength. They are also widely used molding materials in the refractory industry, so there are dozens of types, specifications, and models. Today, the editor will tell you about our common types and their characteristics.
1. High alumina bricks: Al2O3 content is greater than 75, fire resistance is higher than clay bricks, and acid and alkali corrosion resistance is good. This product is suitable for cement kiln firing belts, etc. It has a long service life but high value.
2. Dolomite bricks: have good functions and anti-corrosion properties, but some bricks contain calcium oxide, which is easy to hydrate, difficult to transport and store, and is rarely used in production.
3. Chrome brick: It has a good kiln skin and is a commonly used firing belt. Its disadvantages are poor heat resistance and high toxicity of hexavalent chromium. Countries in the world that manufacture and use magnesia chromium bricks are gradually saving. Now, the production units of refractory bricks should find alternatives soon.
4. Spinel bricks: mostly used in multi-layer belts, with good earthquake resistance and reduction resistance, but slightly poor fire resistance.
5. Anti-flaking brick: This brick contains a small amount of ZrO, which produces martensitic phase transformation during the heating process and forms fine cracks. It has strong alkali resistance, spalling resistance, and slag resistance.
6. Phosphate bricks: Low fire resistance, strong phosphate bricks have good heat resistance, and are mostly used in furnace coolers and kiln head covers.
7. Silicon carbide bricks: resistant to high temperatures, small thermal expansion coefficient, are resistant to rapid cooling, heat, and wear, and are suitable for cooling zones and kiln mouths.
8. Silicon-molybdenum brick: It has good thermal shock resistance, high strength, good wear resistance, and is suitable for excessive wear.
The above are some common classifications, each with its own merits. When choosing refractory bricks in the future, you can first know what you want, and then choose the appropriate product through the above introduction. This can avoid the trouble caused by choosing inappropriate products and is much more convenient.
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