As the core furnace in the ironmaking process, the blast furnace has a very complex internal environment. To ensure the continuity and safety of kiln operations, the fire brick lining is of paramount importance.
1. The harsh operating conditions of blast furnaces
The internal working conditions of a blast furnace are extremely harsh. In actual operation, blast furnaces are not only in a high-temperature environment of over 1600℃ for a long time, but also have to withstand huge thermal stress impacts as well as mechanical wear caused by high-speed airflow and falling furnace charge.
In addition, the severe chemical erosion caused by alkali metal corrosion and other factors inside the furnace will also cause continuous damage to the lining material.
Therefore, only by selecting lining materials that can adapt to such extreme environments can the safety and efficiency of production be guaranteed.
2. Specific selection of different parts of the blast furnace
Different parts of a blast furnace have vastly different requirements for refractory bricks due to their varying operating conditions.
(1) Furnace throat
This part mainly bears the impact and wear of solid furnace charge. Therefore, high-alumina bricks or clay bricks with high density and good wear resistance are usually selected.
(2) Furnace belly
The furnace belly area needs to withstand the intense scouring of high-temperature molten iron and slag, so aluminosilicate fire bricks are generally selected. These types of bricks have strong resistance to slag and iron erosion and good thermal shock resistance.
(3) Furnace hearth
Since the hearth area needs to withstand the erosion of molten iron, the thermal conductivity and impermeability of the materials are of paramount importance. Therefore, high thermal conductivity carbon bricks or corundum bricks are often used here.
3. Considerations for selecting fire bricks
The selection of refractory bricks requires consideration of multiple factors.
(1) Performance indicators
When selecting refractory bricks, performance indicators are the primary consideration.
High-quality refractory bricks can significantly extend the blast furnace maintenance cycle and reduce overall costs. When purchasing refractory bricks, you should request the manufacturer to provide a complete test report, including key data such as load softening temperature, apparent porosity, and compressive strength.
(2) Refractory brick manufacturers
The technical strength of refractory brick manufacturers often determines the final quality of their products. Therefore, it is important to pay attention to whether refractory brick manufacturers have stable production capacity and quality control systems.
It is recommended to prioritize refractory brick suppliers with extensive industry experience and a good reputation. At the same time, a comprehensive evaluation should be conducted on product quality, the reasonableness of refractory brick prices, and service response speed to ensure the long-term stable operation of the blast furnace.
Henan Ruitai Lianxin Refractory Materials Co., Ltd. has 20 years of experience in refractory material production. We not only provide customers with high-quality refractory bricks that meet our standards, but also offer solutions tailored to specific kiln operating conditions.
Please feel free to contact us if you have any needs. Choosing Ruitai Lianxin means choosing strength.