耐火材料应用（Application of refractory material）.docVIP

耐火材料应用（Application of refractory material） 1. refractory material is used in each part of blast furnace body Answer: furnace throat generally use high-density aluminum bricks, but also wear wear-resistant cast steel protective plate protection. The upper and middle shaft with clay brick, high alumina brick or sillimanite brick. Bosh, belly and the lower part of the shaft with carbonaceous products such as silicon carbide, corundum brick. Hearth with sillimanite brick, corundum castable and graphite filler, silicon carbide refractory materials and more. Al2O3-Sic-C brick or carbon block is used at the taphole. Bottom with high density, graphite brick and microporous carbon brick with good thermal conductivity and good erosion resistance. Silicon carbide articles for use in blast furnace tuyere areas and corundum articles bonded with Sialon. 2. Damage mechanism of refractory material in blast furnace body How to repair blast furnace? Answer: (1) furnace throat is affected by the drop in charge of direct impact and friction parts. The upper and middle shaft bearing the main burden impact wear and increased invasion of dust gas, carbon deposition and destruction. The lower part of the shaft temperature is higher, with the formation of a large number of slag, friction burden decline, erosion and erosion of alkali metal vapor dust of furnace gas rises. Bosh slag, serious erosion; potassium sodium vapor erosion; dust generated by steam erosion and corrosion of large coke material friction lining. Bosh, slag of lining erosion, air scour, friction lining of furnace, alkali vapor erosion and carbon deposition and climate fluctuation and so on lining damage will be further intensified. Coke burning at hearth makes high temperature and the corrosion of lining is the most serious. The furnace bottom is mainly affected by molten iron infiltration and molten iron erosion and damage to carbon brick. The blast furnace tuyere area is at a high temperature of 2000 degrees C and is sub