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Carbon Bonding State Has a Small Effect on Melting of Direct-Reduced Iron

Abstract

The concentration and chemical bonding state of carbon in direct-reduced iron (DRI) might affect DRI melting temperature and rate. The effects of carbon bonding state and concentration were evaluated with high-temperature confocal microscopy, differential scanning calorimetry, and by monitoring the carbon monoxide generation rate from reaction between DRI pellets and a laboratory slag-steel melt. In industrial steelmaking, DRI melting is likely controlled by heat transfer; the concentration and bonding state of carbon play secondary roles.

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Notes

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    All gas flow rates are given as equivalent volumes at 1 atm pressure and 21 °C.

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The authors are grateful for financial and technical support by the members of the Center for Iron and Steelmaking Research. The authors would like to acknowledge use of the Materials Characterization Facility at Carnegie Mellon University under Grant # MCF-677785

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Correspondence to Petrus Christiaan Pistorius.

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Manuscript submitted July 8, 2019.

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Kim, G., Kacar, Y. & Pistorius, P.C. Carbon Bonding State Has a Small Effect on Melting of Direct-Reduced Iron. Metall and Materi Trans B 50, 2508–2516 (2019). https://doi.org/10.1007/s11663-019-01691-0

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