Process for smelting converter steelmaking molten iron by using hydrogen-based shaft furnace direct reduced iron

By using hydrogen-based vertical shaft furnace direct reduced iron smelting process in converter steelmaking, and using direct reduced iron as the main raw material, and by controlling the height of the stacking area, micro-positive pressure smelting, and periodic discharge, the problem of converter temperature drop caused by hydrogen-based vertical shaft furnace reduced iron was solved, and efficient and stable converter steelmaking production was achieved.

WO2026129183A1PCT designated stage Publication Date: 2026-06-25ANSTEEL ENG TECH CORP
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ANSTEEL ENG TECH CORP
Filing Date
2024-12-18
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Adding large amounts of hydrogen-based direct reduced iron to the converter leads to excessive temperature drop inside the converter, increasing costs and reducing the quality of molten steel, which is detrimental to subsequent production.

Method used

The converter steelmaking process using hydrogen-based vertical shaft furnace direct reduced iron smelting uses direct reduced iron as the main raw material. The smelting raw material is added through the top charging system of the electric furnace. The height and distance of the accumulation area between the electrode and the furnace lining are controlled. Smelting is carried out under slight positive pressure. Molten iron and slag are discharged regularly. Pressure detection and exhaust systems are set up to ensure stable pressure inside the furnace.

Benefits of technology

This has enabled the large-scale application of hydrogen-based reduced iron in converter steelmaking, reducing costs, improving steel quality, and ensuring production stability and safety.

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Abstract

The present invention relates to a process for smelting converter steelmaking molten iron by using hydrogen-based shaft furnace direct reduced iron. The process comprises: 1) smelting raw materials comprising direct reduced iron, coke powder and lime; 2) after the smelting raw materials are fed into a furnace, forming a material accumulation area between an electrode and a furnace lining, wherein the height of the accumulation area is greater than the length of an electric arc generated by the electrode, and the distance between the bottom of the electrode and the liquid level of molten iron is kept at 200-300 mm; 3) continuously supplying power to the electrode, successively melting the smelting raw materials, and forming, from bottom to top, a molten iron layer, a slag layer and a raw material layer at the bottom of the furnace; 4) controlling the pressure in the furnace within 0-100 pa; and 5) regularly discharging molten iron and slag produced by the electric furnace by means of combined slag-and-iron tapping. In the present invention, a blast furnace ironmaking process is not involved, and direct reduced iron produced by hydrogen-based shaft furnace smelting is directly used as a main raw material for smelting molten iron, which makes it possible to use hydrogen-based reduced iron for converter steelmaking on a large scale.
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