Blow-in burdening method for blast furnace

Abstract

The invention provides a blow-in burdening method for a blast furnace. The method comprises the steps that 100 m<3>-200 m<3> of coke and 300 m<3>-1,300 m<3> of hardwood are arranged in a miscellaneous tree section of the blast furnace; 10 t-20 t of dry extinction coke is arranged in each batch of materials of a net coke section of the blast furnace; 10 t-20 t of coke, 0.5 t-1 t of fluorite and pellet ores with the mass percent not smaller than 60% are arranged in each batch of materials of a normal material section of the blast furnace; and the content of CaF2 in material slag in the normal material section is 2%-6%, the content of Si in molten iron is 2.5%-4%, and the iron charge load level is not larger than 2.5. Thus, the blow-in cost can be reduced by adopting the hardwood for blow-in operation, by adoption of a large proportion of pellet for the blow-in operation, the furnace slag generation amount can be reduced, the ventilation performance of a soft melting belt is improved, the blow-in progress is accelerated, and the direct motion state of the blast furnace is stabilized; and the number of tapping times can be reduced through few-slag or ultralow-slag ratio blow-in, the tapping time is delayed, it is guaranteed that iron in the furnace obtains the sufficient physical heat, and more qualified pig iron can be better recycled.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a batching method for starting a blast furnace. Background technique [0002] The proportion and distribution method of blast furnace start-up charge is the core technology of blast furnace start-up, and also the key to determine the smooth start-up of blast furnace. [0003] Traditional blast furnace batching to control the basicity of slag and Al in slag 2 o 3 The content of sintered ore is used as an important reference index, and the gas permeability in the furnace is ensured by reasonable matching of sinter, pellet ore, lump ore, fluorite, silica, etc., and creates conditions for the blast furnace to quickly add wind to reach production. But often in order to slow down the Al in slag 2 o 3 Due to the negative impact on the fluidity of the slag, it is forced to increase the slag ratio and improve the fluidity in the furnace through a large amo...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a batching method for blast furnace start-up, which is used to solve the problem in the prior art that when the blast furnace is started up, a large amount of slag is usually used to improve the fluidity in the furnace, This leads to large material consumption, high coke ratio, difficulty in controlling the air permeability in the furnace, and technical problems of material suspension and collapse.

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