Refractory materials for blast furnace
Refractory materials for blast furnace masonry provide a basic guarantee for the modernization of blast furnaces. The blast furnace body structure (furnace wall) is composed of three parts: the furnace shell, the cooler and the refractory lining. The main function of the inner lining is to directly resist mechanical, thermal and chemical erosion during the smelting process to protect the furnace shell and other metal structures, reduce heat loss, and form a certain smelting space, that is, the furnace type. The furnace shell plays the role of sealing slag, iron, and gas, and undertakes certain building structure tasks. The cooler is used to protect the inner lining and the furnace shell, and its layout determines the furnace type to a large extent.
There are many factors that affect the life of the blast furnace, and the damage degree of the inner lining is the fundamental factor. Practice shows that the life of the furnace lining varies with the smelting conditions. The belly, waist and lower part of the furnace body are the most severely corroded parts of the blast furnace lining, especially the furnace waist and the lower part of the furnace body, which are difficult to form a protective layer, which have become the weakest link of the blast furnace lining. The furnace throat is mainly affected by the erosion of the solid charge sassafras and the blast furnace gas flow entrained with furnace dust, as well as the sharp change in temperature when the charge is loaded.
1). Refractory materials for blast furnace lining
Modern large and medium-sized blast furnaces require a generation of furnace life of more than 10 years, and blast furnace is a continuous production of metallurgical equipment under high temperature and high pressure, so the quality of refractory materials has a direct impact on the service life of the blast furnace.
2). A blast furnace lining requirements for the use of refractory materials
During the smelting process, extremely complex physical and chemical reactions occur inside the blast furnace, the temperature can be as high as 2000 ℃, and the temperature distribution in the furnace is uneven from top to bottom. In order to keep the reaction in the furnace physically and chemically stable, Refractories for blast furnaces should generally meet the following requirements: at high temperatures, they should not melt, soften, and volatile: at the same time, they should have the strength to maintain the integrity of the furnace structure under high temperature and high pressure conditions: they must be able to withstand temperature changes in the furnace. Thermal shock and wear caused by material drop and gas rise: At the same time, it must have chemical stability to molten iron, slag and gas in the furnace. Since most modern blast furnaces use water-cooled wall technology, it is required that the refractory materials in some parts should have appropriate The thermal conductivity without affecting the cooling effect.