A quick-effect repairing method for converter

Abstract

The invention relates to a quick-effect repairing method for a converter, which comprises the following steps: determining the repairing position, increasing the end point temperature of the converter of the previous furnace, increasing the content of MgO in the final slag of the converter, pouring slag, repairing the furnace charge, sintering the furnace charge, strengthening For sintering charge, after 40 minutes of repairing the furnace, slowly pour about 2 tons of molten iron into the furnace, make the molten iron gather in the repairing charge area through the shaking furnace, and use high-temperature molten iron to re-sinter the repairing charge for 5 to 10 minutes, and repair the furnace After that, start preparing for the next furnace of smelting. On the one hand, the present invention improves the sintering temperature of the repair charge through the combustion-supporting method of gas and oxygen, and on the other hand re-sinters the high-melting-point phase of the repair charge through high-temperature molten iron in the later stage of repair to ensure the sintering effect of the repair charge. The furnace repairing time of the invention is shortened by 10-15 minutes compared with the conventional furnace repairing process, and the number of durable furnaces of the repairing charge is extended by 3-5 furnaces after the process is adopted.

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