Method for repairing steel tapping face furnace lining through final slag of rotating furnace

Abstract

The invention discloses a method for repairing a steel tapping face furnace lining through final slag of a rotating furnace. According to the method, in the furnace repairing process, at first, when smelting and slagging are carried out, metallurgy lime and light burnt dolomite are added to molten steel according to the weight proportion of 3:2; when slag is poured, the left slag amount is controlled to account for 7%-8% of the total charge weight of the rotating furnace; after the molten steel is discharged completely, the residual slag is treated for 1-2 min, the temperature of the furnace slag is reduced properly, viscosity of the furnace slag is increased, then the rotating furnace inclines, the final slag of the rotating furnace is flatly laid to cover the corrosion portion of the steel tapping face furnace lining, power of the rotating furnace is off, and the final slag is cooled statically for over 8 h. According to the method, the corrosion portion of the steel tapping face furnace lining is directly repaired through the slag of the rotating furnace, the high-temperature furnace slag has good mobility and can be laid on the corrosion portion of the furnace lining flatly, high-melting-point substances such as 2CaO, SiO2, MgO, 3CaO and SiO2 in the furnace slag are mutually dispersed, mineral of the same kind is recrystallized, the high-temperature furnace slag is cooled and solidified on the corrosion portion of the furnace lining, the effect of maintaining the furnace lining is achieved, the cost investment of repairing mass is not needed, the frequency of furnace repairing is effectively reduced, the operation rate of the rotating furnace is increased, the furnace repairing effect is good, the furnace repairing cost is low, and use is safe and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a method for repairing the furnace lining on the tapping surface with final slag of the converter. Background technique [0002] At present, the lining maintenance of the tapping surface of the converter is usually mainly based on repairing the repair charge, and assisting oxygen baking and sintering. The sintering time of the repair charge depends on the amount of the repair charge, and the sintering time of each ton of the repair charge is more than 20 minutes. If the sintering time is too short during the furnace lining repairing process, the repairing material may collapse due to impervious sintering during the temperature measurement and sampling process of the converter, causing the slag to splash and burn the workers, and the safety risk is great; if the sintering time is too long, the It will seriously affect the improvement of converter operation rate. Alt...

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Problems solved by technology

[0004] In order to solve the above existing problems, the present invention proposes a method for repairing the lining of the tapping surface with the final slag of the converter. In this method, the eroded part of the lining of the tapping surface is directly repaired by the converter slag, and the high melting point substance 2CaO·SiO in the slag after tapping is used. 2 , MgO, 3CaO SiO 2 The interdiffusion and recrystallization of similar minerals make the high-temperature slag cool and solidify on the eroded part of the furnace lining, which plays a role in maintaining the furnace lining. Under the premise of ensuring the safety of operation and the effect of repairing the furnace, there is no need to invest in the cost of repairing materials, avoiding the disadvantages of sintering time length and Environmental pollution problems can effectively reduce the frequency of refurbishment, improve the operation rate of the converter, the effect of refurbishment is good, the cost of refurbishment is low, and it is safe and environmentally friendly

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