There are many factors endangering the cracking of steel-making furnace bricks, which are related to matte ore grade, refractory quality, wall building processing technology, blowing rules and regulations and operation process.

There are two 60 ton steelmaking furnaces in our factory. The concrete structure of the steelmaking furnace is: 520mm outlet hole brick, 520mm for 9 layers and 460mm for 14 layers in the upper connection area of the outlet hole, with a total area of 380mn under the outlet hole. Refractory materials are built around the furnace door, and the total area on the outlet hole is too thick to improve the corrosion resistance. N working ability.

Life practice shows that the vulnerable positions of steel furnace charge are furnace door, air hole and end wall. In the whole process of blowing, it must bear the relatively serious corrosion of mechanical equipment caused by high-temperature melting, the relatively serious corrosion of coal ash and quartz solution, and the regular fluctuation of temperature control. During the cleaning of furnace door and maintenance of air outlet, mechanical equipment is impacted and damaged. The standard in the work is very strict, especially the furnace door, air hole and end wall slag line. It is not only the perishable position of refractory materials, but also the perishable position of refractory materials. It is not only the stage lacking in concrete structure, but also a professional part of municipal road engineering. The simultaneous service life of these three components means the furnace life of the heating furnace to a very large extent.

According to living practice, when the thickness of brick in the fan hole area of steelmaking furnace is less than 90mm, it can not be used again. The excavation and maintenance must be terminated, and the maintenance must be terminated when the rest of the infilled wall is less than 150mm.

Because of the impact force of the air and the rise and surge of the cyclone, the mixing kinetic energy of the solution is very large. When the vapor-liquid two-phase mixture collides with the surface layer of the solution, the solution is sprayed onto the secondary lining of brick masonry by the vapor-liquid two-phase liquid, causing obvious impact on the secondary lining of mechanical equipment, creating a standard for organic chemical corrosion, so it is effective. Key steps to improve the service life of steelmaking furnace. Effective fan compressive strength and fan rules and regulations are beneficial to reduce the harm of solution to refractory and increase the service life of steelmaking furnace.

In the whole process of blowing, it is difficult to avoid the generation of belt magnet. During the work of blowing the air outlet, the solution supplement in the air outlet area is very easy to produce knots in the air outlet area, and the air outlet area must be continuously removed. Vibration analysis does great harm to the damage of brick lining in the air outlet area. Under the action of solution deposition, when the deterioration layer rises, the surface of the air outlet area will deteriorate. At a certain level, the brick will fall off, which will seriously endanger the furnace life.

The resistance of refractories to the damage caused by temperature change in the whole process of heating and cooling is called thermal shock resistance, which is the core index to consider the quality of refractories. Fire resistance. The thermal damage of refractories is related to the internal stress caused in the production process of refractories.