Method for reducing tapping frequency of blast furnace

Abstract

The invention discloses a method for reducing the tapping frequency of a blast furnace. The method comprises the following steps that a clay gun is beaten to a tapping hole of the blast furnace through a clay beater, and the blast furnace is controlled to conduct closing operation for at least 50 minutes; gun clay comprises the components of, by mass, more than 25% of Al2O3, 25%-30% of SiO2, and more than 15% of SiC and 15%-20% of C; and a tapping machine is used for opening an iron notch of the blast furnace, molten iron in the blast furnace is discharged, in the first tapping stage, the interval time range of two adjacent times of molten iron discharging is 70-90 minutes, in the second tapping stage, the interval time range of two adjacent times of molten iron discharging is 80-100 minutes, in the third tapping stage, the interval time range of two adjacent times of molten iron discharging is 90-110 minutes, in the fourth tapping stage, the interval time range of two adjacent times of molten iron discharging is 100-120 minutes, and in the fifth tapping stage, the interval time range of two adjacent times of molten iron discharging is 110-130 minutes. According to the method, thetapping frequency of the blast furnace can be reduced, and the gun clay consumption can also be reduced.

Description

technical field [0001] The invention relates to the technical field of blast furnace ironmaking, in particular to a method for reducing the tapping times of the blast furnace. Background technique [0002] For today's modern large-scale blast furnaces, tapping before the furnace plays a vital role in blast furnace production. The blast furnace taphole is composed of the taphole frame, the furnace wall, and the mud bag near the taphole in the hearth. The taphole has been in the environment of high-temperature slag and molten iron corrosion and flow erosion for a long time, and is also eroded by alkali metals and damaged by thermal stress. . When the discharge of slag and iron is not clean, the liquid level of slag and iron in the hearth rises, the buoyancy of slag and iron to the material column increases, the descending space of the furnace charge decreases, the material speed slows down, the air permeability and liquid permeability of the lower area decrease, and the press...

AI Technical Summary

Problems solved by technology

The number of tapping times can increase the following hazards: the amount of iron accumulated in the hearth decreases, and the heat compensation for the hearth is less, which will easily cause the activity of the hearth to decrease; Increase; insufficient sintering time of blasting mud will affect the depth of furnace door and clean slag iron, and the splashing of iron at the wet iron outlet will affect the life of equipment; reduce the service life of blasting mud and opening machine; the consumption of mud material, ditch material, and large and small rods will increase

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