During the manufacturing of the blast furnace's internal structure, the brick joints are the weakest points in the brickwork, making them the primary entry point for erosion during application. To extend the overall service life of the blast furnace and reduce damage caused by lining erosion, refractory mortar is used to modify the brick joints during filling, thus improving the lining's sealing. Since refractory mortar is an unshaped refractory material, its preparation requires careful consideration of the brick joint material, temperature adjustments, and joint matching to ensure adhesion and refractoriness. This ensures a smooth, unified blast furnace lining after filling, minimizing the reduction in high-temperature resistance caused by lining erosion.
During the blast furnace lining process, it is necessary to ensure that a cooling wall exists between the lining and the furnace shell. This cooling wall is achieved by adding filler material, allowing the insulation or adhesive between the two lining layers to form a protective film and also enabling the internal materials to function effectively. After the blast furnace has been in operation for a period of time, the waist and lower parts of the furnace body suffer severe erosion due to thermal erosion. This increases the combined energy during operation, causing damage to the cooling equipment under high temperature and pressure, resulting in bulging or cracking of the furnace shell surface. To address this, grouting is used to inject monolithic refractory material into the furnace body to extend its service life and reduce the safety risks associated with equipment damage.
When cracks appear in the blast furnace lining, surface treatment can be achieved through lining spraying. Generally, a layer of monolithic refractory material is sprayed to prevent further cracking caused by the cracks. Meanwhile, since the blast furnace itself is forged using high-quality bauxite and graphite as the main raw materials, the addition of a certain amount of silicide can ensure that it becomes a hard object after being subjected to high pressure and high temperature. It has the functions of high temperature resistance and good thermal conductivity, so it can effectively improve its service life when applied.
