Blast furnace banking method

Abstract

The invention discloses a blast furnace stewing process, which comprises the following steps that adding blowing-down burden material in a blast furnace, damping down when blowing-down burden material reaches to the upper edges of a furnace hearth, gradually descending stock-line to the several meters under a furnace throat, adopting the way of watering on the furnace top portion and appropriate reducing blast, controlling the temperature of the furnace top portion within 300 DEG C, instantly opening a blast pipe cover plate, plugging an air inlet with water-stem, then covering on the cover plate, starting to press coke free positive material and positive material into the blast furnace after plugged the air inlet, controlling the temperature of the furnace top portion about at 200 DEG C, wherein the furnace top portion temperature can gradually descended to 100 DEG C in 3 hours after stewing material is finished to fill. The process has excellent stewing effect, has stable temperature in the blast furnace, can shortens blow-in process after stewing, can fast recover the furnace situations after air recovery in the blast furnace, can generate iron in large amount, has stable slag basicity after stewing burden discharged, can guarantee the iron water quality, can save large amount of coke and grain slag, can improve blast furnace technical economical index and create favorable economical benefits.

Description

technical field [0001] The invention relates to a blast furnace braising method, in particular to a blast furnace braising method for lowering the top temperature of the blast furnace. The method can achieve the effect of the traditional braising method, and is beneficial to restore the furnace condition as soon as possible to increase the pig iron output and ensure the quality of molten iron. Background technique [0002] The modern ironmaking process is carried out in the blast furnace. The blast furnace is a vertical cylindrical furnace body made of refractory materials. The outer shell is reinforced and sealed with steel plates. The built-in cooler and refractory materials are protected. The furnace automatically From top to bottom, it is divided into furnace throat, furnace body, furnace waist, furnace bosh and hearth. Ironmaking is the process of smelting iron ore into metallic iron at high temperature in a blast furnace. The whole process is completed in the mutual co...

AI Technical Summary

Problems solved by technology

Due to the good sealing degree of water slag, after using water slag to stew the furnace, the furnace start-up process is longer, and it is difficult to restore the furnace condition after the blast furnace is re-aired, thus prolonging the time for the blast furnace to return to normal; while using raw ore for stewing furnace, due to Raw ore contains more acidic minerals. After the furnace is finished, a large amount of acid material from the furnace will cause low alkalinity of the slag and affect the quality of molten iron.

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