What are the precautions for the use of impermeable breathable bricks?

The essence outside the furnace has become an important part of the modern steelmaking process, and the argon blowing at the bottom of the ladle is also an important part of the essence outside the furnace, and the ladle breathable brick is the key component to complete this process, which steelmaking manufacturers pay special attention to. Good breathable bricks It should have the characteristics of long service life, good bottom blowing effect, no (less) purging, safety and reliability. At present, the ventilation bricks mainly include slit type and anti-seepage type. The width and distribution method of slit ventilation bricks must be Reasonable design is carried out according to the capacity of the ladle, the type of tempered steel and the required air permeability, so the production process is more complicated; the anti-seepage type air brick produces many irregularly distributed through pores by controlling the particle size ratio of the ingredients. relatively simple.

The anti-seepage type breathable brick adopts the structure of a combination of a breathable inner core and fine high-strength materials: the working range of the brick core is an anti-seepage type design, and the Anxian device adopts a slit type design. If the residual height of the brick is insufficient, the ventilation brick needs to be replaced.

In the process of transportation and installation of the breathable brick, it is necessary to ensure that the thread of the steel pipe at the end is not damaged, so as not to cause the pipeline to be loosely connected and leaked, which will affect the flow of argon blowing and the blowing rate; ensure that the tail steel pipe does not enter the dust and debris, etc.; The working surface should not be covered by fire mud or other materials, so as to avoid the failure of bottom blowing. During installation or use, ensure that the pipeline is connected tightly and does not leak, otherwise the argon pressure will be insufficient, which will affect the stirring effect and cause the blowing rate to drop. .

If the alloy is added too early when the converter is tapping, and the molten steel level in the ladle is too low, the low melting point of the alloy with strong permeability will easily lead to poor permeability of the brick core. The argon operation is not standard, and the argon gas is not turned on in time to mix after tapping, which will easily lead to the difficulty of blowing out the essence in the early stage.

The bottom of the cladding is seriously crusted, there are many online turnover ladles, the slag can be poured in time after the steel is poured, the hot repair does not blow the breathable brick, the ladle hot stop time is long, and the molten steel tapping temperature is one level lower, all of which easily lead to the appearance of the brick core. There are residual molten steel and steel slag, and the appearance is simple and crusty, which affects the ventilation function.