Reduction steel-making method and reduction steel-marking device

Abstract

The invention relates to a reduction steel-making method. The reduction steel-making method comprises the following steps of: (1) carrying out initial reduction reaction on iron ore materials entering a prereduction zone in a furnace; (2) carrying out a reduction reaction simultaneously when heating and smelting the mixture entering a high temperature zone in the furnace by an electric arc or a plasma arc; (3) carrying out depth reduction reaction on molten steel entering a molten pool in the furnace to form qualified molten steel; and (4) periodically discharging the molten steel and slag from a tap hole and a slag hole. The invention further provides a reduction steel-making device. According to the reduction steel-making method and the reduction steel-making device, the production flow is short, the overall land occupation is small, ore to finished product metal yield is high, the energy consumption is low, carbon coke and a large amount of oxygen are not used, iron alloy is not needed or a small amount of iron alloy is needed except that a special steel grade is made, the carbon emission and the exhaust emission in a smelting process are reduced, and energy saving and emission reduction are facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a reduction steelmaking method and device. Background technique [0002] The metallurgical principle of the current oxidation steelmaking process represented by the long process of blast furnace-oxygen top-blown converter is to use coke to reduce the metal oxides in iron ore into molten iron in the blast furnace, and carbon is infiltrated during the reduction process. , and at the same time reduce alloy elements such as Mn and Si and harmful impurities such as P and S and dissolve them in molten iron. Therefore, excess C and harmful impurities in molten iron must be removed by oxidation and adding flux during the steelmaking process. Due to chemical thermodynamic reasons, when removing these impurity elements, alloying elements such as Si, Mn, V, and Ti will be oxidized preferentially, so during the tapping process, additional alloying elements such as ferrosilico...

AI Technical Summary

Problems solved by technology

[0004] 2) Si, Mn, V, Ti and other alloying elements in iron ore will be oxidized into slag and not fully utilized, so a large amount of ferroalloy needs to be added in the process of steelmaking and tapping; Larger, resulting in a waste of resources

[0005] 3) The repeated process of carbon addition and decarbonization in the smelting process not only increases energy consumption and oxygen consumption, but also increases the greenhouse gas CO 2 emissions

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