A method for removing slag from molten steel

Abstract

The invention relates to a method for removing slag from molten steel, which controls the upper clearance of the molten steel tank to be greater than 300 mm when tapping the converter. When the molten steel tank is tilted to the angle of slag removal, first remove the solidified slag shell; then add lime particles into the molten steel tank according to the ratio of lime and slag of 1:3 to 6 and spread evenly; after the lime and steel slag fully react , Scrape out the residual steel slag in the molten steel tank. Due to the chemical reaction between the lime and the high-temperature molten steel, the steel slag is foamed and the volume of the steel slag is increased, and the steel slag can be discharged from the molten steel tank when it is overturned. And in the process of lime melting and reaction, the temperature of the surface layer of steel slag will decrease, which will increase the viscosity of steel slag and make the steel slag easy to remove, thereby reducing the pollution of molten steel by strong oxidizing steel slag on the surface of molten steel, improving the purity of molten steel, and reducing the amount of deoxidizer. consumption and cost expenditure, reduce the workload of deoxidation treatment, increase the speed of slag removal, and reduce labor intensity.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for removing steel slag from the surface of molten steel in a molten steel tank. Background technique [0002] During the tapping process of the converter, there will be a certain eddy current in the series of processes from the beginning of tapping to the end of tapping, which will inevitably bring the steel slag in the converter into the molten steel tank, so the converter slag It has also become the main source of inclusions in molten steel. This kind of steel slag has strong oxidizing property, and it is very easy to cause pollution to molten steel. In order to prevent molten steel from being polluted, the steel slag must be deoxidized, which increases the consumption of deoxidizer and increases the production cost. Simultaneously, in order to reduce inclusions in molten steel and improve the purity of molten steel, almost all steelmaking ...

AI Technical Summary

Problems solved by technology

[0003] However, due to the extremely high temperature of molten steel, generally above 1600°C, the steel slag in the molten steel tank is in a molten state, and the molten steel slag has excellent fluidity, and it is difficult to remove the steel slag during the process of removing slag from molten steel. Time-consuming and labor-intensive, increases labor intensity, and affects the purity of molten steel, reducing the intrinsic quality of steel