Common Types of Refractory Bricks

Refractory bricks are a well-known refractory material that is suitable for all walks of life, especially the construction industry, and are an indispensable raw material. Do we have a deep understanding of it because it is so close to our lives?

Refractory bricks, referred to as fire bricks, are a type of refractory material made of refractory clay or other refractory raw materials. In short, it is a type of fire-resistant and high-temperature-resistant brick. The material is light yellow or brown, mainly used to build smelting furnaces, and can withstand high temperatures of 1580℃-1770℃. It is also called fire bricks 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, fused 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. Refractory clay bricks, high-alumina bricks, silica bricks, magnesia bricks, and other high-temperature building materials and structural materials 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 a product with good density and good strength resistance. 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 the common types and characteristics of our refractory bricks.

1. High-alumina bricks: Al₂O₃ content is greater than 75, the refractory performance is higher than clay bricks, and the acid and alkali corrosion resistance is good. This product is suitable for cement kiln firing belts, etc., with a long service life but high value.

2. Dolomite bricks: have good functions and corrosion resistance, but some bricks contain f, -CaO, which is easy to hydrate, difficult to transport and store, and rarely used in production.

3. Chrome bricks: have good kiln skin and are commonly used in firing belts. Its disadvantages are poor heat resistance and high hexavalent chromium toxicity. Countries in the world that manufacture and use magnesia-chrome bricks are gradually saving. Now, the production units of refractory bricks should find substitutes quickly.

4. Spinel bricks: mostly used in excessive belts, with good anti-seismic and anti-reduction properties, but slightly poor refractory properties.

5. Anti-stripping bricks: This brick contains a small amount of ZrO, which produces martensitic phase transformation during heating, forming fine cracks, and has strong alkali resistance, anti-stripping, and slag resistance.

6. Phosphate bricks: low refractory resistance, strong phosphate bricks have good heat resistance, and are mostly used in furnace coolers and kiln head covers.

7. Silicon carbide bricks: high-temperature resistance, small thermal expansion coefficient, quenching resistance, heat resistance, and wear resistance, suitable for cooling belts and kiln mouths.

8. Silicon molybdenum bricks: have good thermal shock resistance, high strength, good wear resistance, and are suitable for excessive wear.

The above are some common classifications, each with its advantages. When choosing refractory bricks in the future, you can first know what you want, and then choose the right product through the above introduction, to avoid the trouble caused by choosing inappropriate products, which is much more convenient.