What is refractory brick
2024-06-06 09:12:55
Refractory bricks are a kind of building and industrial materials with excellent performance in high temperature environment. They are mainly used for the lining and insulation layer of various high temperature furnaces. The following is a detailed introduction to refractory bricks, including its definition, characteristics, classification, production process, application field and future development.
1. Definition
Refractory bricks are a special refractory material, usually made of refractory clay or other refractory raw materials through molding and firing. They have high refractoriness, generally not less than 1580℃, can maintain their shape and performance in high temperature environment, and are not easily corroded by slag, molten metal or acid and alkali.
2. Characteristics
High refractoriness: The refractoriness of refractory bricks usually reaches above 1580℃, and can work stably for a long time in high temperature environment.
Good thermal stability: At high temperature, the volume change of refractory bricks is small, and it is not easy to crack or deform.
Good slag resistance: Refractory bricks have strong resistance to slag and can maintain their structure and performance under slag erosion.
Resistance to acid and alkali: Refractory bricks have strong resistance to acid and alkali and are not easily corroded by acid and alkali.
Good thermal conductivity and thermal shock stability: Refractory bricks have good thermal conductivity and can quickly transfer heat; at the same time, their thermal shock stability is also good, and they can maintain their structural integrity under rapid temperature changes.
3. Classification
According to the composition and performance of refractory bricks, they can be divided into the following categories:
Silica refractory bricks: With SiO2 as the main component, they have good acid resistance, slag resistance and high refractoriness.
Clay refractory bricks: With Al2O3 and SiO2 as the main components, they have high refractoriness and good thermal stability.
High alumina refractory bricks: With a high Al2O3 content, they have high refractoriness, load softening temperature and slag resistance.
Magnesia refractory bricks: With MgO as the main component, they have high refractoriness and resistance to alkaline slag erosion.
Zirconium refractory bricks: With ZrO2 as the main component, they have extremely high refractoriness and erosion resistance.
4. Manufacturing process
The manufacturing process of refractory bricks mainly includes the following steps:
Raw material processing: Mix the refractory raw materials in a certain proportion and add an appropriate amount of binder and additives.
Molding: Put the mixed raw materials into the molding mold and shape them by pressing or vibration.
Drying: Dry the molded refractory bricks to remove excess moisture.
Firing: Put the dried refractory bricks into the kiln for firing, and control the parameters such as firing temperature and time to achieve the required performance requirements.
5. Application field
Refractory bricks are widely used in industrial fields such as metallurgy, chemical industry, petroleum, machinery manufacturing, silicate, and power. In steel smelting, refractory bricks are the main material for blast furnaces, hot blast furnaces and other kilns; in the glass industry, refractory bricks are used for the masonry of glass melting furnaces; in the cement industry, refractory bricks are used for the masonry of cement rotary kilns. In addition, refractory bricks are also used in various high-temperature equipment and containers in the fields of chemical industry, machinery, etc.
6. Future development
With the continuous development of industrial technology, the performance requirements for refractory bricks are getting higher and higher. In the future, the research and development of refractory bricks will focus more on improving their refractoriness, slag resistance, thermal shock stability and other properties, while reducing their production costs and environmental pollution. In addition, with the continuous emergence of new refractory materials, the application field of refractory bricks will be further broadened.
1. Definition
Refractory bricks are a special refractory material, usually made of refractory clay or other refractory raw materials through molding and firing. They have high refractoriness, generally not less than 1580℃, can maintain their shape and performance in high temperature environment, and are not easily corroded by slag, molten metal or acid and alkali.
2. Characteristics
High refractoriness: The refractoriness of refractory bricks usually reaches above 1580℃, and can work stably for a long time in high temperature environment.
Good thermal stability: At high temperature, the volume change of refractory bricks is small, and it is not easy to crack or deform.
Good slag resistance: Refractory bricks have strong resistance to slag and can maintain their structure and performance under slag erosion.
Resistance to acid and alkali: Refractory bricks have strong resistance to acid and alkali and are not easily corroded by acid and alkali.
Good thermal conductivity and thermal shock stability: Refractory bricks have good thermal conductivity and can quickly transfer heat; at the same time, their thermal shock stability is also good, and they can maintain their structural integrity under rapid temperature changes.
3. Classification
According to the composition and performance of refractory bricks, they can be divided into the following categories:
Silica refractory bricks: With SiO2 as the main component, they have good acid resistance, slag resistance and high refractoriness.
Clay refractory bricks: With Al2O3 and SiO2 as the main components, they have high refractoriness and good thermal stability.
High alumina refractory bricks: With a high Al2O3 content, they have high refractoriness, load softening temperature and slag resistance.
Magnesia refractory bricks: With MgO as the main component, they have high refractoriness and resistance to alkaline slag erosion.
Zirconium refractory bricks: With ZrO2 as the main component, they have extremely high refractoriness and erosion resistance.
4. Manufacturing process
The manufacturing process of refractory bricks mainly includes the following steps:
Raw material processing: Mix the refractory raw materials in a certain proportion and add an appropriate amount of binder and additives.
Molding: Put the mixed raw materials into the molding mold and shape them by pressing or vibration.
Drying: Dry the molded refractory bricks to remove excess moisture.
Firing: Put the dried refractory bricks into the kiln for firing, and control the parameters such as firing temperature and time to achieve the required performance requirements.
5. Application field
Refractory bricks are widely used in industrial fields such as metallurgy, chemical industry, petroleum, machinery manufacturing, silicate, and power. In steel smelting, refractory bricks are the main material for blast furnaces, hot blast furnaces and other kilns; in the glass industry, refractory bricks are used for the masonry of glass melting furnaces; in the cement industry, refractory bricks are used for the masonry of cement rotary kilns. In addition, refractory bricks are also used in various high-temperature equipment and containers in the fields of chemical industry, machinery, etc.
6. Future development
With the continuous development of industrial technology, the performance requirements for refractory bricks are getting higher and higher. In the future, the research and development of refractory bricks will focus more on improving their refractoriness, slag resistance, thermal shock stability and other properties, while reducing their production costs and environmental pollution. In addition, with the continuous emergence of new refractory materials, the application field of refractory bricks will be further broadened.