Blast furnace is an important equipment for iron making. Small blast furnaces used to be hoisted and built with high alumina cement and high alumina phosphate refractory castable prefabricated blocks. Now resin-bonded aluminum carbon unburned bricks are commonly used for masonry. Large blast furnace water walls The SiC castable is used for ramming, and the furnace bottom cushion and the surrounding brick joints are made of refractory castable and silicon nitride filler. A development trend of the refractory material for the furnace wall is to use castable. Japan Steel Pipe Company Fukuyama Plant No. 2 The blast furnace uses a high-density castable of Al2O350% and SiO245% on the top of the furnace body. After 6 years of use, it is found that spalling rarely occurs.
At present, the unshaped refractories used for blast furnace tapping trenches at home and abroad are mainly Al2-O3-SiC-C (ASC for short), in addition to mullite-SiC-C, Al2O3-C, magnesium-aluminum spinel Corundum-SiC castables are mainly used in my country. In Japan, most blast furnace taps use ASC castables and repair gunning materials, and some small blast furnace taps use bauxite or synthetic mullite- SiC-C quality ramming material. ASC quality ramming material is generally used in the blast furnace tapping trenches in Germany and France. France has developed a self-flowing castable, which improves the working life of the main tapping trench.