Method for preventing slag bonding of blast furnace refractory lining

Abstract

The invention relates to the field of iron and steel smelting, in particular to a method for preventing slag bonding of a blast furnace refractory lining. The method comprises the following steps that S1, river sand and coke powder are uniformly mixed and aired to obtain a protective material; S2, impurities on the surface of the refractory lining are removed, and a damaged position of the surface of the refractory lining is repaired; S3, a heat preservation layer with a height of 3 cm to 15 cm and a width of 35 cm to 60 cm is laid on the periphery of the refractory lining by means of a subpackaged heat preservation agent; S4, a protective layer with a lower end width of 25 cm to 45 cm and an upper end width of 5 cm to 25 cm is laid on the heat preservation layer in S3 by means of the protective material obtained through mixing in S1, the lower end of the protective layer makes contact with the heat preservation layer, and the top end of the protective layer is flush with the center line of an iron notch hole channel; and S5, an iron notch is drilled and then plugging operation is conducted. The method can effectively reduce risk hidden dangers of mortar leakage during plugging and incapability of plugging a notch, meanwhile reduces the damage of slag iron to the refractory lining, prolongs the service life of the refractory lining, saves the cost, and also reduces the workload of a furnace front iron notch worker.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a method for preventing slagging of blast furnace mud. [0002] technical background [0003] At present, the slag and iron produced by blast furnace smelting are all discharged from the blast furnace taphole, so as to realize the purpose of continuous production of blast furnace. Blast furnace taphole operation is a very important link in blast furnace production. The quality of blast furnace taphole maintenance directly affects the discharge of slag and iron and the smooth operation of the furnace. The plugging operation, the maintenance of the iron mouth mud sleeve, and the formation and maintenance of the iron mouth mud bag. Among them, the maintenance of iron mouth mud sleeve is an important part. [0004] The slag formation of the iron-hole mud sleeve is the main factor affecting the maintenance of the iron-hole mud sleeve. The slagging part of the taphole mud sleev...

AI Technical Summary

Problems solved by technology

The slagging part of the taphole mud jacket is mainly under the taphole mud jacket. During tapping, high-temperature slag iron drips below the taphole, and part of the slag iron contacts the lower surface of the taphole, and is bonded to the surface of the mud jacket under high temperature. After cooling, a hard bonded body is formed, which is difficult to clean up, resulting in uneven surface of the iron hole mud sleeve, mud running out of the plug, serious failure of the plug, overflow of molten iron after the molten iron tank is full, and other major safety accidents

[0005] The treatment method of the existing iron hole mud sleeve slagging: first use a steel drill to poke off the slagging, and deal with the large slagging, but the high temperature in the iron hole area, and the light at the iron hole is strong, so it is difficult to deal with, especially the tightly bonded slag iron Difficult to poke off, the mud sleeve may be poked or slag cannot be poked off

Then use compressed air or oxygen to purge, because oxygen is easy to damage the mud sleeve, and the safety risk of burning oxygen at high temperature slag and iron is high, generally use compressed air to purge the surface of the mud sleeve before plugging, if the slag and iron stick If it is too tight, the blowing will not be clean, the mud casing material will be blown off together, or the surface of the mud casing will be damaged by blowing for a long time. There is no quick and effective method for slagging on the surface of the mud casing

Images