When choosing refractory bricks, you need to consider its material, performance, application environment and other factors. The following is a detailed purchase guide:

1. Classification of refractory bricks
Silica refractory bricks:

Contains more than 93% silicon dioxide (SiO2).
It has high refractory performance and load softening temperature at high temperature.
It is suitable for high temperature environments such as kilns and glass melting furnaces.
Alumina-silica refractory bricks:

Contains alumina (Al2O3) and silicon dioxide (SiO2).
It has good refractoriness and slag resistance.
It is widely used in steel, non-ferrous metallurgy and chemical industries.
Magnesia refractory bricks:

Contains magnesium oxide (MgO) as the main component.
It is suitable for high temperature alkaline environments such as steel converters, open hearth furnaces, etc.
Carbon refractory bricks:

The main component is carbon.
It has excellent anti-oxidation and anti-slag properties.
Commonly used in blast furnace linings, electric arc furnaces, etc.
2. Performance indicators of refractory bricks
Refractory:

Indicates the ability of materials to maintain their shape and performance at high temperatures.
The refractoriness of general refractory bricks should be above 1580℃.
Load softening temperature:

Refers to the temperature at which refractory bricks begin to deform under high temperature and load.
High load softening temperature means better high temperature bearing capacity.
Thermal shock resistance:

Indicates the stability of refractory bricks under rapid temperature changes.
High thermal shock resistance can extend the service life.
Chemical corrosion resistance:

The ability of refractory bricks to resist chemical corrosion at high temperatures.
Different application environments require the selection of refractory bricks with different chemical corrosion resistance.
3. Application environment analysis
Steel smelting:

Converters, electric arc furnaces, etc. require magnesia or carbon refractory bricks with high refractoriness and high resistance to slag corrosion.
Cement kilns:

The kiln mouth, kiln head and other parts require alkali-resistant magnesia or aluminosilicate refractory bricks.
Glass melting furnace:

The glass melting pool requires siliceous refractory bricks with high refractoriness and low expansion.
Ceramic kiln:

The temperature in the kiln is uniform, and the thermal shock resistance of refractory bricks is required to be high. Alumina-silica refractory bricks are suitable.
4. Purchase precautions
Material quality:

Choose products from regular manufacturers to ensure the quality of raw materials.
Check the quality inspection report of the product to ensure compliance with relevant standards.
Product specifications:

Choose refractory bricks of appropriate specifications and shapes according to actual application requirements.
Ensure accurate dimensions and easy installation.
Supplier reputation:

Choose suppliers with good reputation and after-sales service.
Ensure that technical support and services can be provided in a timely manner.
Cost-effectiveness:

Consider price and performance comprehensively and choose products with high cost-effectiveness.
Don't blindly pursue low prices and ignore quality and performance.
5. Conclusion
Choosing suitable refractory bricks requires comprehensive consideration of factors such as material, performance and quality based on specific application environments and needs. By understanding the characteristics and applicable scope of different types of refractory bricks, combined with actual working conditions, the most suitable refractory bricks can be selected to ensure the safe and efficient operation of high-temperature equipment.