A technology for reducing the amount of steel slag in converter smelting

Abstract

The invention discloses a process for reducing steel slag quantity during converter smelting. The process comprises the steps that a 100t top-bottom combined blowing converter is adopted for smelting in a steel making process, splashing slag converter protection is conducted, liquid slags inside the converter are solidified, 5+ / -0.5 t waste steel is added, and molten iron is poured into the converter; converting dephosphorization is conducted, then deslagging is conducted, the basicity of steel slags is controlled according to R=CaO / SiO2=3, lime and light-burned magnesian limestone are added into the converter, the effective content of CaO in the lime is equal to or larger than 53.5%, and the adding amount of the light-burned magnesian limestone is determined according to the smelting process; converting decarburization is conducted; and steel tapping is conducted, and the slags are left in the converter. According to the process, the using amount of flux such as the lime is reduced, the amount of solvent, such as the lime, used for slag making is reduced, the line consumption and energy resource consumption are reduced, and the lime using amount and the slag quantity are reduced. The consumption of steel and iron materials is reduced. The amount of iron carried out through the steel slags is reduced by reducing the slag quantity.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a process for reducing the amount of steel slag in converter smelting. Background technique [0002] In the steelmaking process, the main reasons for the large amount of slag mainly include: the CaO content in the steelmaking lime is low; the activity of the steelmaking lime is low, less than 260 ml; the silicon content in the steelmaking molten iron is high, And the fluctuation range is large; the content of phosphorus and sulfur in molten iron for steelmaking is relatively high. [0003] The above reasons lead to an increase in lime consumption, steel slag, and smelting energy consumption during the steelmaking process, which prolongs the steelmaking and smelting cycle, reduces production efficiency, increases the consumption of steel materials, increases the amount of steel slag processed, and increases the amount of solid waste. increase, affecting environmental pollutio...

AI Technical Summary

Problems solved by technology

[0005] However, the cost of hot metal pretreatment is high, the temperature drop of hot metal is large, and the turnaround time from hot metal blast furnace to converter is affected. It is necessary to build a fixed hot metal pretreatment station, which produces secondary solid waste such as dephosphorization and desulfurization slag, and the production cost is high.