The lining materials for blast furnaces have evolved from brick masonry to monolithic refractory materials.Monolithic castables are widely used in various industrial furnaces.The rapid development of silica sol materi...The lining materials for blast furnaces have evolved from brick masonry to monolithic refractory materials.Monolithic castables are widely used in various industrial furnaces.The rapid development of silica sol materials,combined with the commonly used construction methods of casting and spraying,offers greater flexibility,efficiency,environmental friendliness,and a longer lifespan.Typical monolithic refractory technologies,such as the integral casting technique for the furnace hearth,the pre-applied slag coating technique for the furnace belly and waist,and the inner lining gunning technique,are grounded in scientific theory and practice,thereby advancing the development of refractory materials and enhancing the operational quality of blast furnaces.展开更多
Al_(2)O_(3)-SiC castables,for the relining of BF hearths in mid-campaign repair,were sampled and investigated after two years’service.The chemical and mineralogical characteristics of the residual castables were anal...Al_(2)O_(3)-SiC castables,for the relining of BF hearths in mid-campaign repair,were sampled and investigated after two years’service.The chemical and mineralogical characteristics of the residual castables were analyzed by X-ray diffraction,scanning electron microscopy,and energy dispersive X-ray spectrometry to study the erosion mechanism.The results show that as gaseous K diffuses in the castables,leucite(KAlSi_(2)O_(8))and multiple cracks are formed.Molten iron and slag penetrate through the cracks to form anorthite([Ca,Na][Al,Si]_(4)O_(8))and iron,which will not form an embrittlement layer similar to carbon bricks.The entire repair of the hearth with Al_(2)O_(3)-SiC castables combined with the design of thin-wall lining hearth eliminates“elephant foot shaped”erosion,greatly prolonging the service life of the hearth lining.展开更多
文摘The lining materials for blast furnaces have evolved from brick masonry to monolithic refractory materials.Monolithic castables are widely used in various industrial furnaces.The rapid development of silica sol materials,combined with the commonly used construction methods of casting and spraying,offers greater flexibility,efficiency,environmental friendliness,and a longer lifespan.Typical monolithic refractory technologies,such as the integral casting technique for the furnace hearth,the pre-applied slag coating technique for the furnace belly and waist,and the inner lining gunning technique,are grounded in scientific theory and practice,thereby advancing the development of refractory materials and enhancing the operational quality of blast furnaces.
文摘Al_(2)O_(3)-SiC castables,for the relining of BF hearths in mid-campaign repair,were sampled and investigated after two years’service.The chemical and mineralogical characteristics of the residual castables were analyzed by X-ray diffraction,scanning electron microscopy,and energy dispersive X-ray spectrometry to study the erosion mechanism.The results show that as gaseous K diffuses in the castables,leucite(KAlSi_(2)O_(8))and multiple cracks are formed.Molten iron and slag penetrate through the cracks to form anorthite([Ca,Na][Al,Si]_(4)O_(8))and iron,which will not form an embrittlement layer similar to carbon bricks.The entire repair of the hearth with Al_(2)O_(3)-SiC castables combined with the design of thin-wall lining hearth eliminates“elephant foot shaped”erosion,greatly prolonging the service life of the hearth lining.
