Molten iron dephosphorization method

JPWO2026014529A1Pending Publication Date: 2026-01-15
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Patent Information

Application Number
JP2025566799
Authority / Receiving Office
JP · JP
Patent Type
Applications
Priority Date
2024-07-12
Filing Date
2025-07-11
Publication Date
2026-01-15

AI Technical Summary

Technical Problem

Conventional dephosphorization methods for molten iron face challenges in preventing solidification and ensuring dephosphorization capacity, particularly when using cold iron sources with low carbon content, which leads to increased melting temperatures and slag oxidation, causing refractory wear and reduced dephosphorization efficiency.

Method used

A method involving high-temperature treatment of molten iron (1650°C to 1750°C) with a high-basicity slag (4.0 to 6.0) and controlled oxygen and stirring gas supply to inhibit solidification and refractory wear, while maintaining dephosphorization capacity, by adjusting the gas supply rate ratio (1 to 100) and ensuring appropriate carbon and oxygen concentrations.

Benefits of technology

The method effectively prevents molten iron solidification and refractory wear, while achieving low phosphorus concentrations in the molten iron, enhancing dephosphorization efficiency and stability in steel production.

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Abstract

The present invention provides a technology for performing a dephosphorization process in which both dephosphorization ability and solidification inhibition of molten iron are ensured. This molten iron dephosphorization method is for performing a dephosphorization process on molten iron held in a container while supplying a slag-making material and an oxygen source to the molten iron and agitating the same by blowing an agitation gas into the molten iron, and is characterized in that: the temperature of the molten iron at the start of the dephosphorization process is 1650-1750°C; the basicity which is the mass ratio of CaO with respect to SiO2 contained in slag generated by melting the slag-making material in the molten iron is 4.0-6.0; and a supply gas rate ratio which, based on volume in a standard state, is the ratio of the per-unit time supply amount of oxygen in the form of a gas in the oxygen source with respect to the per-unit time supply amount of the agitation gas supplied for agitating the molten iron is adjusted.
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