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Influence of Metallurgical Conditions on the Lining Wear in the Kaldo Process

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Abstract

The influence of different metallurgical conditions on the lining wear in the Kaldo process when refining high phosphorus iron has been systematically investigated revealing the following main features

The lining is protected by a lime-saturated layer of slag during the main part of the first blowing period.

The lining wear starts in connection with the melting of this protective layer which occurs at the end of the first period. After that, the wear rate increases rapidly.

The rapid increase of the lining wear is caused by direct combustion in a strongly oxidizing atmosphere of liquid iron which has been dragged up on the lining surface.

By decreasing the oxygen activity in the furnace atmosphere at the end of the oxygen-blowing period the wear can be decreased considerably. In practice this has been solved by directing the oxygen jet with high impulse steeply into the bath during this period of the blowing. In this way the lining life in Domnarvet’s 30 ton Kaldo furnace has been increased by about 75% without reducing the steel yield. Blowing time and consumption of oxygen have at the same time decreased by about 10%.

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References

  1. S. Bergh, H. Sandberg and N. Stahl, Continuous Measurements of the Lining Wear in Steel Furnace by Use of Radioactive Isotopes, Journal of Metals, 1969, Vol. 21, no. 2, p. 19–22; and Jernkontorets Annaler, Vol. 152, 1968, no. 9.

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  4. K. Carr, J. L. Evans, L. A. Leonard and H. M. Richardson, Transactions British Ceramic Society, Vol. 66 (1967), p. 493.

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Authors and Affiliations

  1. Stora Kopparberg, Domnarvets Jernverk, Borlange, Sweden

    Hans Sandberg, Sten Bergh & Erik Bengtsson

Authors
  1. Hans Sandberg
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  2. Sten Bergh
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  3. Erik Bengtsson
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Sandberg, H., Bergh, S. & Bengtsson, E. Influence of Metallurgical Conditions on the Lining Wear in the Kaldo Process. JOM 21, 33–39 (1969). https://doi.org/10.1007/BF03378795

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  • DOI: https://doi.org/10.1007/BF03378795

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