Method for controlling rising of cinder surface in tapped steel ladle from converter

Abstract

The invention provides a method for controlling the rising of a cinder surface in a tapped steel ladle from a converter. The method comprises the following steps of: controlling the total loading amount in the converter to the degree that the free space height of the tapped steel ladle is more than or equal to 400mm; correspondingly preparing an aluminum deoxidant according to the difference of the [C] content at blowing end point of the converter; when the tapping of the converter is carried out to be one third, starting sequentially adding a first batch of aluminum deoxidant and recarburizing agent into the steel ladle; meanwhile, starting blowing argon at the flow of 30-50Nm<3> / h; when the clearance of the steel ladle is 600-800mm, adding the aluminum deoxidant into the steel ladle according to the adding amount of 0.6-0.8kg / t of steel; and stopping blowing bottom argon to the steel ladle in one minute before the tapping is ended. According to the method disclosed by the invention, the problem of the rising of the cinder surface in the tapped steel ladle from the converter is effectively solved and the rising ratio of the cinder surface is reduced from 30 percent to 1 percent, thereby the cinder overflow of the steel ladle is avoided, the hoisting speed of the ladle is increased, the accidents of hurting people by splashing of molten steel are avoided and the steel remained in the converter is reduced.

Description

technical field [0001] The invention belongs to the field of steelmaking process control, and in particular relates to a method for preventing the slag surface in a ladle from rising after tapping when the carbon content of the molten steel is increased to 0.05% or more during the tapping process when the carbon content of the converter is below 0.05%. Background technique [0002] Due to the high level of automation of large-scale converters, they are equipped with rich and powerful systems to assist in the control of the smelting process. Generally, the carbon content (weight percentage, the same below) at the end of converter smelting is controlled between 0.03 and 0.05%, and the slag and molten steel at the end of the converter are highly oxidizable. When producing weakly deoxidized steel grades with specification carbon above 0.12%, a certain amount of recarburizer should be added to the converter. Since the converter adopts a weak deoxidation process, the molten steel ...

AI Technical Summary

Problems solved by technology

After the slag surface rises, the slag will overflow the edge of the ladle, which not only affects the lifting of the ladle, but also easily splashes the slag in the ladle during the lifting of the ladle, causing injury accidents

At the same time, once the slag level rises, it will affect the furnace director's accurate judgment of the height of the free space in the ladle, which will easily cause the phenomenon of steel remaining in the converter