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June 14, 2026ISIJ InternationalOpen Access

Measurement of the Reduction Rate of Molten FeO-CaO Oxide by CO Gas Injection Through an Immersed Nozzle

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Authors

KUKentaro UrataKNKeisuke NagaseNFNaoki Fukushima

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Overview

Randomized trial measures reduction rate in molten FeO-CaO oxide using CO gas injection, suggesting novel control factors.

Key Points

  • The aim is to measure how CO gas injection affects the reduction rate of molten iron oxides with varying CaO content.
  • Reduction experiments conducted at 1723 K using pure CO gas injected through an iron nozzle.
  • Measured the size and generation cycle time of CO bubbles using the pressure pulse method.
  • Examined the reduction degree and observed precipitate formation beneath the nozzle over a 3600 s duration.
  • Dense iron particles formed beneath the nozzle, with deposited oxide containing metallic iron observed.
  • Reduction degree and rate decreased linearly with increased CaO content.
  • Extrapolated reduction rate at 100% FeO was lower than previous literature values.

Cite This Study

Urata et al. (2026) studied this question.

synapsesocial.com/papers/6a2e456cb1cc60ccdea8a941https://doi.org/10.2355/isijinternational.isijint-2025-373
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