Method for evaluating reduced iron and method for operating blast furnace

JP2026009613APending Publication Date: 2026-01-21JFE STEEL CORP
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Patent Information

Application Number
JP2024109607
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-07-08
Publication Date
2026-01-21

AI Technical Summary

Technical Problem

Existing methods for evaluating reduced iron, such as cold briquetted iron (CBI) and hot briquetted iron (HBI), fail to accurately assess the degree of breakage and breakage during transportation and charging into a blast furnace, leading to unpredictable permeability issues due to disintegration and powdering.

Method used

A method for evaluating reduced iron using image analysis to measure particle length and width before and after a drop test, calculating a disintegration index (BI) to assess strength properties and particle size distribution, and controlling charging conditions to maintain good permeability by ensuring a drop strength index (SI_Fe) of 90% or more and disintegration index (BI) of 55% or less.

Benefits of technology

Enables accurate evaluation of reduced iron disintegration and powdering, allowing for stable blast furnace operation by preventing permeability deterioration.

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Abstract

To provide a method for evaluating reduced iron, which can evaluate the degree of disintegration and powdering of reduced iron during a period from the conveyance of the reduced iron to the charging thereof into a blast furnace.SOLUTION: An evaluation method of reduced iron according to the present invention is an evaluation method of reduced iron for evaluating a strength property and a particle size distribution of reduced iron to be charged into a blast furnace, the evaluation method including the steps of measuring lengths of reduced iron particles before and after a drop test by using image data of the reduced iron particles before and after the drop test, calculating a disintegration degree BI by regarding a reduced iron particle having a length equal to or more than a minimum value of the lengths of the reduced iron particles before the drop test as a sound product, and evaluating the strength property and the particle size distribution of the reduced iron based on the calculated disintegration degree BI.SELECTED DRAWING: Figure 1
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