A kind of hot-filling material for exterior air-permeable seat brick and preparation method thereof

Abstract

The invention relates to a hot mending material for an externally-mounted breathable seat brick and a preparation method thereof. The preparation method comprises the steps of weighing the following raw materials in percentage by weight: 46-78% of corundum, 4-12% of sintered magnesite, 1-2% of sintering aid, 8-20% of binding agent, 2-8% of solid water glass and 3-12% of alumina micropowder, uniformly mixing corundum, sintered magnesite, solid water glass and alumina micropowder in a stirrer, then, adding the sintering aid and the binding agent in the mixed mixture, mixing uniformly again, discharging and packaging, wherein both corundum and sintered magnesite consist of granular materials and powdery materials. According to the hot mending material and the preparation method thereof, dry construction can be carried out, water added stirring is not required, furnace shutdown is not required, the construction is simple and convenient, the hot mending material can be directly thrown into a hot ladle and is sintered by means of heat in the ladle, the sintering is safe and environment-friendly, and the externally-mounted breathable seat brick can be subjected to quick hot mending; and the hot mending material has the advantages of good slag erosion resistance, liquid steel scouring resistance and heat shock stability.

Description

technical field [0001] The invention relates to the field of unshaped refractory materials, in particular to a hot-filling material for exterior air-permeable seat bricks and a preparation method thereof. Background technique [0002] In the iron and steel metallurgical industry, after the molten steel smelted in the steelmaking furnace enters the ladle, the breathable brick installed at the bottom of the ladle is used to blow argon gas into the molten steel to stir the molten steel, which can accelerate the realization of the metallurgical process, homogenize the temperature and chemical composition of the molten steel, and promote inclusions. To remove or control the shape of inclusions and shorten the refining time of molten steel, the breathable brick needs to be used in conjunction with the breathable brick seat. During the turnover process of the ladle, it will undergo multiple cycles of cold and heat with the ladle. Therefore, in actual use, it will be stable due to it...

AI Technical Summary

Problems solved by technology

[0002] In the iron and steel metallurgical industry, after the molten steel smelted in the steelmaking furnace enters the ladle, the breathable brick installed at the bottom of the ladle is used to blow argon gas into the molten steel to stir the molten steel, which can accelerate the realization of the metallurgical process, homogenize the temperature and chemical composition of the molten steel, and promote inclusions. To remove or control the shape of inclusions and shorten the refining time of molten steel, the breathable brick needs to be used in conjunction with the breathable brick seat. During the turnover process of the ladle, it will experience multiple cycles of cold and heat with the ladle. Therefore, in actual use, it will be stable due to its own thermal shock. Poor performance, peeling, falling blocks, or even cracking problems

If the breathable seat brick peels off or falls off, the effective height of the seat brick is likely to be lower than the height of the brick core, resulting in a decrease in the protective effect of the seat brick on the brick core, thereby shortening the service life of the breathable brick; if the breathable seat brick cracks , the molten steel goes down along the cracks of the seat bricks, and steel leakage accidents may occur in severe cases