In the construction of hearth bottom of blast furnace, besides the reasonable match of ceramic cup and carbon brick, the choice of filler and ramming material between carbon brick and cooling fragments is also very important. If the thermal conductivity of packing, rounding material and other unshaped refractory materials is too low or pores and air gaps occur after opening the furnace, the heat lining of the hearth bottom will indirectly hinder the heat transfer to the cooling fragmentation, which becomes the restrictive link of heat transfer of the hearth bottom, thus leading to the aggravation of the corrosion of the hearth bottom.

Only three years after the furnace was opened, the galvanocouple temperature of the rapping material layer at the bottom of a certain blast furnace exceeded 400℃, which aroused the attention and alert of the blast furnace operators. Through calculation and analysis of the stop corrosion of the hearth bottom, it can be seen that two layers of ceramic pad at the bottom of the furnace had been corroded away. Identifying the furnace bottom temperature anomaly lower secondary reason is dao layer material coefficient of thermal conductivity is too low, this also and presents a practical furnace bottom mash material layer mixes up scene, indirectly affect the short-lived hearth, which hold back the water effect develop in addition, the layer of concrete is due to the bottom of the furnace blast furnace low coefficient of thermal conductivity by furnace bottom corrosion intensifies, had to pound the bed on to a new cooling water pipe device. Therefore, hearth bottom filler, ramming material coefficient of thermal conductivity should be progress as far as possible, should contact with and the phase of the thermal conductivity of the refractory material similar or differences, hearth bottom ring carbon bricks should cancel the dao of material layer between the cooling wall, indirect contact with the cooling stave make carbon brick, thermal resistance, increasing spare progress hearth lining of a composite heat transfer efficiency of cooling stave.