Method for preventing steel ladle slag bonding in refining process

Abstract

The invention discloses a method for preventing steel ladle slag bonding in the refining process. The method comprises the steps that firstly, converter tapping is conducted, after normal smelting of a converter is finished, the tapping temperature is controlled to range from 1,600 DEG C to 1,700 DEG C, slag blocking treatment is adopted in the tapping process, and the slag thickness is smaller than 50 mm; secondly, a steel ladle is rapidly conveyed to a refining station, and the transportation time is required to be not larger than 10 min; thirdly, the steel ladle is conveyed to the refining station, electrodes are immediately lowered for the steel ladle, it is ensured that an anode makes contact with slag but does not make contact with molten steel, a cathode makes contact with a magnesia carbon brick but does not make contact with slag or molten steel, then, stable voltage is applied to the slag and the magnesia carbon brick for slag bonding preventing treatment, and bottom blowing air stirring is conducted in the treatment process; fourthly, bottom blowing air must be stopped before 3 min of elevating of the electrodes; and the fifthly, the electrodes are elevated, and after refining is finished, the steel ladle is conveyed to the next station.

Description

technical field [0001] The invention belongs to the field of steelmaking, and in particular relates to a method for preventing ladles from sticking to slag during refining outside a furnace. Background technique [0002] Ladles are containers for storing, transporting and handling molten steel. With the continuous improvement of the quality of steel grades, many steel grades require refining treatment in the ladle, such as hydrogen blowing, fine-tuning of alloy composition, vacuum treatment and powder spraying refining, etc., so that the ladle has expanded from the traditional function of receiving molten steel to a metallurgical function. Therefore, the sticky slag in the ladle lining has gradually become a serious problem affecting the normal operation of steelmaking and continuous casting. [0003] The slag lining of the ladle has an important impact on the normal operation of the ladle: ①The weight of the ladle increases after the slag is stuck, which inevitably poses ...

AI Technical Summary

Problems solved by technology

The anti-stick coatings disclosed in the above-mentioned patents all have the problem that the coating will become thinner with the increase of service time. After a certain number of furnaces are processed, the coating will be consumed and lose its original effect, and it must be sprayed again, otherwise the anti-sticking coating will be damaged. The sticking effect is difficult to guarantee, which is not conducive to continuous production

In addition, the process of spraying anti-sticking slag coating not only increases the labor intensity of workers, but also pollutes the environment and affects health

[0005] As mentioned above, there are still some problems in the current method to solve the problem of ladle sticking slag. If additional modifier is needed, the result will increase the amount of ladle slag and affect the refining operation.

Or after a certain number of furnaces are processed, the coating will be consumed and lose its original effect, and it must be sprayed again, otherwise the anti-sticking effect is difficult to guarantee, which is not conducive to continuous production

Images