Methods to improve the effectiveness of gas blowing at the bottom of the ladle (2)

(Picture) DW series slit type breathable brick

Regarding the process of argon blowing at the bottom of the ladle and the requirements for the air-permeable bricks, we have already conducted an analysis. This article focuses on the techniques to improve the efficiency of blowing gas at the bottom of the ladle and to extend the life of the breathable brick.

1. Skills for using breathable bricks

By comparing the use and damage of the air-permeable bricks in different positions, the following conclusions are drawn: when the air-permeable bricks are placed between the bottom radius of the bag and multiplied by 0.37-0.5, the mixing effect is relatively good and the damage of the wall lining is more uniform. To

Install two air-permeable bricks at the symmetrical part of the bottom of the bag, which can make the mixing more uniform and improve the effect of the bottom blowing process.

To

2. Skills to improve bottom blowing process and extend the life of breathable bricks

In the process of using air-permeable bricks, the deposition of steel slag after the completion of the pouring will often cause slag blockage, resulting in poor bottom blowing or even bottom blowing. In order to ensure the implementation of the bottom blowing process, the method of blowing and burning off the slag layer with strong oxygen is often used in the production, but this method is extremely serious to the damage of the breathable brick. The following methods can relatively prolong the service life of air-permeable bricks and better ensure the implementation of the bottom blowing process.

1. Strictly control the amount of slag, which not only ensures that the ladle multifunctional covering agent is fully in contact with molten steel, but also improves the yield of the alloy. At the same time, the melting point and viscosity of the slag phase are purposefully controlled to ensure the implementation of the bottom blowing gas process. .

2. Install a one-way valve on the quick connector of the bottom blowing gas pipeline. After blowing, ensure that the pipeline air pressure does not leak, so that the molten steel will not penetrate into the slit of the breathable brick.

3. It is inevitable that the slit-type ventilating brick cannot be blown, especially when the ventilating brick reaches the end of its life. Therefore, the introduction of impermeable air-permeable bricks can completely solve this problem. There are also individual steel mills that use bottom-blowing venting cores outside to address the situation where the venting bricks are blocked and refining cannot be carried out. When the air-permeable core is blocked or severely corroded, the air-permeable core is quickly replaced from the outside of the bottom of the bag. However, this sacrifices the safety of the breathable brick and the integrity of the bottom of the bag, and increases the risk of use.

in conclusion

In order to improve the effect of blowing gas at the bottom of the ladle, it can be achieved by the following methods: 1. Placing the air-permeable bricks in a reasonable position can improve the effect of argon blowing. 2. Choosing a more technically advantageous breathable brick can increase the service life of the breathable brick and the bottom blowing rate of the ladle. 3. Reasonably determine the blowing process parameters to achieve the best bottom blowing effect.