Iron notch pretreatment method used during blowing in of blast furnace

Abstract

The invention discloses an iron notch pretreatment method used during blowing in of a blast furnace. The iron notch pretreatment method comprises the following steps: preboring an iron notch, flatly putting an oxygen pipe while enabling the oxygen pipe to directly face the iron notch, feeding oxygen, enabling the oxygen pipe to burn inwards and melt cold iron slag in an iron notch channel, when the inward movement distance of the oxygen pipe is approximate to the normal thickness of a furnace wall, upwards bending the oxygen pipe, meanwhile swinging the oxygen pipe, and enabling the oxygen pipe to spirally advance so as to burn upwards and melt cold iron slag in the furnace; meanwhile, feeding oxygen, enabling the oxygen pipe to burn from air ports at the two sides of the iron notch to the direction of the iron notch so as to melt cold iron slag in the iron notch channel and an air port channel, after hot iron slag outflows, continuing feeding oxygen so as to heat iron slag for draining, and after the iron notch channel and the air port channel is burned through, plugging and thus completing iron notch pretreatment. According to the iron notch pretreatment method, the iron notch channel and the air port channel are quickly and effectively communicated with each other by doing various preparatory work well such as butt welding and lengthening the oxygen pipe in advance and swinging the oxygen pipe during burning the iron notch, the rapid blowing in and the designed capacity achievement are realized, and good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of blast furnace front operation, and more specifically relates to a method for pretreatment of a tap hole when a blast furnace is restarted. Background technique [0002] When the blast furnace is shut down for a long time or restarted after the furnace hearth freezes, due to the low temperature in the furnace and the extremely poor fluidity of slag and iron, it is often difficult to discharge the cold slag and iron out of the furnace in time, which is not conducive to the recovery of the blast furnace condition. Therefore, the pretreatment of the taphole before the furnace is very important. It is necessary to fully prepare for the passage between the taphole and the tuyere and quickly discharge the cold slag iron to create favorable conditions for the rapid recovery of the blast furnace. [0003] The traditional method of firing iron outlets is to use the oxygen pipes to be placed flat or even downward, r...

AI Technical Summary

Problems solved by technology

[0003] The traditional method of firing iron outlets is to use the oxygen tube to be kept flat or even tilted downwards, resulting in that the tuyere and the iron outlet cannot be quickly and effectively connected, and there are disadvantages such as narrow iron outlet passages and time-consuming frequent replacement of the oxygen tube.