Quick-acting furnace repairing method of converter

Abstract

The invention relates to a quick-acting furnace repairing method of a converter. The quick-acting furnace repairing method comprises the following steps: determining a furnace repairing position; increasing the final temperature of the prior converter before furnace repairing; increasing the content of MgO in converter final slags; performing deslagging; pouring furnace repairing materials; sintering the furnace materials; reinforcing the sintered furnace materials; after furnace repairing is performed for 40 minutes, enabling about two tons of molten iron to be slowly poured into the converter; gathering the molten iron to a furnace repairing material region through a shaking furnace; performing resintering on the furnace repairing materials for 5-10 minutes through high temperature molten iron; and after furnace repairing is completed, starting to prepare the smelting of the next converter. According to the quick-acting furnace repairing method disclosed by the invention, on one side, by a method of performing heat preservation with coal gas and adding oxygen for combustion-supporting, the sintering temperature of the furnace repairing materials is increased; and on the other side, in the later stage of furnace repairing, through the high-temperature molten iron, high melting point phase of the furnace repairing materials is sintered once again, so that the sintering effect of the furnace repairing materials is guaranteed. Compared with the furnace repairing time through a conventional furnace repairing technology, the furnace repairing time of the quick-acting furnace repairing method disclosed by the invention is shortened by 10-15 minutes; and after the technology is adopted, the durable converter number of the furnace repairing materials is prolonged by 3-5 times.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a quick-acting repairing method for a converter. Background technique [0002] The lining of the converter is easily damaged due to mechanical erosion, high temperature, chemical erosion, spalling, improper operation during the smelting process, etc. The large surface before the converter is impacted by scrap steel and scoured by molten iron, and the large surface after the converter is soaked in high-temperature molten steel for a long time during the tapping process. These two large surfaces are eroded faster than other parts of the furnace lining. In order to make the furnace lining erode evenly and avoid production shutdown caused by too fast local lining damage, it is necessary to repair and maintain these two large surfaces regularly. Its maintenance method is to pour furnace filling material into the furnace, evenly spread it on the front and rear large surfaces, and ...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantage of the existing furnace repairing process is: after the furnace repairing material is sintered, it adheres to the surface of the furnace lining

The existing repairing process only relies on the temperature in the furnace to sinter the repairing material, the sintering speed is slow, and the repairing time is long, usually about 60 minutes. In addition, with the repairing time, the temperature in the furnace gradually decreases. It is difficult to meet the temperature requirements to ensure good sintering of the repairing materials. Therefore, the repairing materials are not sintered firmly and the number of durable furnaces is small. Generally, the repairing furnace can last for 5 to 7 furnaces at a time, and the repairing furnace is more frequent

Due to the above shortcomings, the existing furnace repair process reduces the utilization rate of the converter and the annual steel production of the steelmaking plant