Method for directly reducing iron through electric reduction furnace

Abstract

The invention discloses a method for directly reducing an iron through an electric reduction furnace. The method is characterized by comprising steps as follows: mixing a desulfurizing agent, a dephosphorizing agent and a reducing agent; drying until materials contain less than 3% of water; crushing dried materials until reaching granularity less than 1.5mm, so as to obtain a reducing additive; crushing an iron ore, then drying until the materials contain less than 3% of the water; heating the reducing additive and the iron ore in the electric reduction furnace, wherein iron oxide is reduced to obtain the iron; cooling the materials in the electric reduction furnace; crushing; and magnetically separating to obtain reduced iron. By adopting the method, the iron ore with any quality and any shape and proper carbon are mixed as reducing agents, which are directly reduced to obtain a sponge iron in a form of solid by the electric reduction furnace; and a metal ratio can reach over 96%.

Description

[0001] technical field [0002] The invention relates to a method for directly reducing iron in an electrothermal reduction furnace, and belongs to the technical field of direct reduction iron processing. Background technique [0003] Blast furnace ironmaking system (including coking, sintering, and blast furnace), after hundreds of years of application and development, its technology has been quite perfect, but because of its long process flow, large investment, serious environmental pollution, and poor operational flexibility, it is only suitable for Those countries with initial industrial development produce conventional products, primary steel, with very low added value. In developed countries, blast furnace ironmaking technology is facing elimination, and the living space is even smaller. [0004] After today's society has entered the era of materials, the steel required by the market is no longer a traditional material, and the electric furnace ironmaking with scrap s...

AI Technical Summary

Problems solved by technology

[0006] (1) The production scale is too small, and the method is old, the production capacity is small, the energy consumption is high, and the pollution is serious;

[0007] (2) The raw material required for direct reduced iron must be high-grade, low-gangue pure iron ore, which is very scarce in my country, so there is a lack of stable raw material supply channels;

[0008] (3) Due to the limitation of natural gas resources, the development of gas-based direct reduction is slow;

[0009] (4) Lack of unified planning and failure to build a large-scale commodity DRI (direct reduced iron) production enterprise