Working environment of breathable bricks

(Picture) FS series impermeable 透氣磚

The steel industry is one of my country’s important industrial industries. In the process of steelmaking, permeable bricks, although occupying a very small part, play a vital role. This article will explain the working environment of breathable bricks in the steelmaking process from four points.

1 Erosion of high-speed and high-pressure airflow and high-temperature molten steel

During the refining process, the molten steel is blown with argon and stirred. The high-speed and high-pressure airflow is blown into the ladle from the permeable brick, and the stirring intensity of the molten steel is controlled by the method of controlling the gas flow. The phenomenon that people see with their eyes is that the molten steel in the ladle boils. At this time, the gas at the bottom of the ladle interacts with the molten steel to form a turbulent flow. At the same time, due to the recoil of the airflow, the breathable brick and the surrounding refractory parts will be severely affected. Scour.

2 Erosion of molten slag after pouring of molten steel

After the molten steel is poured, the working surface of the breathable brick is fully in contact with the slag, and the molten slag continuously infiltrates into the brick along the working face of the breathable brick. The oxides such as CaO, SiO2, Fe203 in the steel slag react with the breathable brick to form a low total The melt causes the ventilation brick to be eroded. To

3 When the ladle is hot repaired, an oxygen pipe is used to blow the working surface of the ventilating brick to cause melting loss

When purging the working surface of the ventilating brick, the staff uses an oxygen tube in front of the ladle to blow the residual steel slag around the ventilating brick until the ventilating brick turns black slightly.

4 The rapid cold and hot during the cycle turnover and the mechanical vibration during the hoisting process

Ladle receiving steel is carried out intermittently in turn, heavy ladle is affected by rapid heat, and empty ladle is affected by rapid cooling. At the same time, the ladle is inevitably impacted by external forces during operation, resulting in mechanical stress.

結束語

It can be seen that the working environment of breathable bricks is extremely harsh. For steel mills, it is necessary to ensure production, but also to ensure the good use of breathable bricks, and more importantly, safety. Therefore, the importance of breathable bricks in steelmaking is evident.