Furnace body is an important part of the blast furnace, the burden of the heating, reduction and slagging effect. From beginning to end under the gas flow scour and the impact of the material. But the furnace body of low and middle temperature (400 ~ 800 ℃), no harm of slag slag formation and erosion. The impact mainly bear burden and furnace dust rising wear or thermal shock (up to 50 ℃ / min) or invaded by alkali, zinc and carbon deposition and destruction. So this part mainly adopts high quality clay brick of low porosity and high alumina bricks. Especially in the variety of refractory products increased and quality improve, under the condition of blast furnace lining life are greatly extended.
But with large and medium blast furnace harsh operating conditions and the establishment of greatly extend the service life of blast furnace, the parts require the use of in the spalling resistance and abrasion resistance are all very excellent refractory materials. Therefore, the combination of phosphate is also used in the furnace body department of clay brick, the upper and middle also use silicon line stone brick and spalling resistance of high aluminum refractory brick.
This area of the furnace under high temperature, heat exchange is more area, a large number of eutectic formation, there is hot burden falls friction role, the gas rises dust scouring and alkali metal vapor erosion. Therefore, this area vulnerable to erosion, serious cooler eroded all light, only to maintain by steel shell. So, require the use of good slag resistance, alkali resistance and high temperature strength and wear resistance of high quality clay brick, high alumina brick, corundum brick, aluminum carbon bricks or carborundum brick, for cooling plate lining structure is use of graphite bricks.
