What refractory bricks are used in blast furnaces, what are the ingredients and how to construct them?
Release time:
2024-04-23
As the key equipment in iron and steel production, the internal environment of blast furnace is extremely harsh. High temperature, high pressure, chemical erosion and other conditions require refractory bricks to have excellent fire resistance, corrosion resistance and mechanical strength. In the construction of blast furnace, the commonly used refractory bricks mainly include the following:
1. High alumina refractory bricks: The main components are alumina and silicate, which have good refractoriness and slag resistance.
2. Clay refractory bricks: clay as the main raw material, suitable for low temperature parts.
3. Magnesia refractory brick: a refractory material containing magnesium, which has good stability and corrosion resistance at high temperature.
When selecting refractory bricks, it is necessary to choose according to the working conditions of different parts of the blast furnace. Such as blast furnace body, furnace belly and other high temperature areas, usually choose high alumina or magnesia refractory brick, and in the lower temperature area, such as the bottom of the furnace, can choose clay refractory brick.
Different refractory brick composition is different, but the main chemical composition includes silicate, alumina, iron oxide and so on. These components have good stability and corrosion resistance at high temperatures, ensuring the use of refractory bricks. In addition, some mineral raw materials and additives will be added according to demand to improve the performance of refractory bricks.
The construction technology of 3. refractory brick The construction of refractory brick is the key link in the construction of blast furnace, and its construction quality directly affects the operation safety and service life of blast furnace. The main construction steps include:
1. Foundation treatment: clean the foundation surface to ensure that there is no oil, debris, etc.
2. Masonry preparation: prepare refractory bricks of various specifications according to design requirements and check their quality.
3. Masonry construction: masonry shall be carried out according to the requirements of masonry process to ensure dense and smooth brick joints.
4. Brick joint treatment: use refractory cement or other materials to fill the brick joint to ensure no leakage.
5. Post-maintenance: After the construction is completed, a certain period of maintenance is required to ensure that the refractory bricks are closely integrated with other parts of the blast furnace.
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