Rev. Met. Paris
Volume 89, Number 9, Septembre 1992
|763 - 772
|24 January 2017
Kinetics and morphological aspects of the dissolution and reduction of hematite pellets in oxygen steelmaking converters*
Cinétiques et aspects morphologiques de la dissolution et de la réduction de pellets hématites au convertisseur à l'oxygène
The kinetics and mechanism of hematite pellet dissolution in liquid iron containing carbon and in liquid low carbon steel have been studied both on laboratory and plant scale. Microscopy shows that hematite reduces to magnetite due to heating the pellet in the bath. Carbon from the liquid iron reduces magnetite to wüstite and FeO to Fe ; magnetite melts before complete reduction to wüstite.
The dissolution kinetics of pellets in 315 t converters are affected by temperature and carbon content in the metal. Oxygen from the pellets is used for decarburization 1 to 2 min after addition in the converter, when the pellets are added during the first 3 to 4 min of the blow ; only a part of the oxygen is used when the pellets are added after 80 % of the blow.
Subject of lecture at the ATS Steelmaking Conference 1991 (Paris, 4-5 December, 1991, Session 1).
The authors gratefully acknowledge the help from Messrs. L.F. Castricum and A.M.A. van Oudheusden for carrying out laboratory experiments. We also thank Mr. J. Trouw for his assistance with the optical microscope and fruitful discussions, and we thank Mr M. Koohvijk for his assistance with the electron microscope.
© La Revue de Métallurgie 1992
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