- Time:Jul 28, 2023
Refractories for blast furnaces can be divided into various types according to their different uses and locations. The following is a detailed introduction of some common types of refractories for blast furnaces:
1. High-alumina refractories
High-alumina refractories are characterized by high alumina (Al2O3) content, and have high refractoriness and slag erosion resistance. They are commonly used in the hearth area, high temperature zone and riser and throat areas of blast furnaces. High alumina refractories can be divided into different grades, such as AL60, AL70 and AL80, etc., representing the percentage of alumina content.
2. Magnesium-aluminum refractories
Magnesia-aluminum refractories are mainly composed of magnesium oxide (MgO) and alumina, and have good refractoriness and alkali resistance. They are usually used in the hearth area and high temperature zone of blast furnaces. Magnesium-aluminum refractories can be divided into different grades, such as MA80, MA85 and MA90.
3. Silicate refractories
Silicate refractories are mainly composed of silicate minerals, usually made of kaolin, bentonite and quartz. They have good refractoriness and slag resistance, and are suitable for the top area and some special parts of blast furnaces.
4. Chromium refractory material
Chromium refractory material mainly consists of chromium oxide (Cr2O3), which has excellent refractoriness and corrosion resistance. They are commonly used in the riser and throat areas of blast furnaces and can effectively resist alkaline corrosion in molten iron.
5. Carbonaceous refractories
Carbonaceous refractories usually use graphite and coke as the main components, and have good thermal conductivity and wear resistance. They are widely used in locations such as the top area and tapholes of blast furnaces, where they are resistant to high temperatures and shocks.
In addition, there are other types of refractories for blast furnaces such as quality rare earth refractories, refractory castables, ceramic fiber products, etc. These refractories play different roles in the blast furnace smelting process, protecting the inner wall of the blast furnace, strengthening the structure, and resisting high temperature and corrosion. The selection of specific refractory materials will be determined according to the design requirements of the blast furnace, furnace conditions and economic considerations.
