Composite air brick for steel ladle and preparation method thereof

Abstract

A composite air-permeable brick for a ladle and a preparation method thereof, relating to a composite air-permeable brick for a steel ladle, comprising a diffused air-permeable block, a diffused brick base and an outer layer protective castable, and a trapezoidal trapezoid is arranged on the upper part of the outer protective castable The diffused air-permeable block has a hole in the middle of the bottom surface of the diffused air-permeable block, a diffused brick base is provided at the lower part inside the outer protective castable, and a downwardly recessed step is provided at the middle of the upper part of the diffused brick base, and the diffused air-permeable block is set On the steps above the diffuse brick base, there are base ventilation slits on both sides of the middle of the diffuse brick base; the prepared diffuse breathable block and diffuse brick base are installed, and the outer layer of protective castable is added to form brick adobe. After curing, drying, cladding and welding, it can be packaged and transported; the invention achieves the goals of not easy to generate faults, high air permeability and high yield.

Description

technical field [0001] The invention relates to a composite air-permeable brick, in particular to a composite air-permeable brick for a ladle and a preparation method thereof. Background technique [0002] It is well known that the existence of inclusions is one of the main factors that endanger the quality of steel, and removing as many inclusions in molten steel as possible is a main purpose in the refining process of molten steel. At the same time, in order to homogenize the temperature and composition of the molten steel, the current smelting process basically adopts the smelting process of installing a permeable brick at the bottom of the ladle for gas injection. The implementation of this process is simple and easy to implement, and the effect is remarkable. The system has been used on a large scale. [0003] In the production process of slit-type ventilation bricks, organic combustibles are pre-embedded in the interior. After high-temperature firing, the organic comb...

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Problems solved by technology

[0003] In the production process of slit-type ventilation bricks, organic combustibles are pre-embedded in the interior. After high-temperature firing, the organic combustibles are burned and volatilized to leave a ventilation channel. The flow rate of the ventilation bricks can be adjusted in a large range. At the same time, it has the characteristics of simple production; but the slit-type permeable bricks are prone to faults and steel penetration in the ventilation channels during use, which will affect the air permeability of the permeable bricks.

[0004] The emergence of diffused air bricks can effectively solve the shortcomings of slit type air bricks, such as easy faults and steel penetration in air channels. The diffuse air bricks are based on the apparent porosity of the air channels. Because the pores are evenly distributed and the pore size is small, The blown air bubbles have the advantages of small diameter and large number, so they have excellent de-inclusion effect, especially in the current situation that the number of inclusions in steel is getting lower and lower, the de-inclusion effect of diffused air-permeable bricks is even better. It has incomparable advantages; but at the same time, at the later stage of use, the working surface of the permeable brick may be covered with more residual steel and residue, which may affect the air permeability of the permeable brick after condensation; if the number of times of oxygen burning increases, it is not conducive to ventilation Increased service life of bricks

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