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Stabilization of Metal-in-Slag Emulsions

  • Technical Article
  • 1970 Charles H. Herty Award Pager
  • Published:
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Abstract

Iron-in-slag emulsions are shown to be created by the attachment of large silicate or phosphate anions onto the surfaces of metal droplets, thus combining the droplet within the slag structure. The most significant factors favoring emulsion stabilization are: a high concentration of anion chain forming oxides such as Si02, Al2Os, and especially P205; and a high concentration of iron oxides. The absorption of iron ions (from iron oxides) is shown to neutralize the anion droplet pairs to form highly stable iron-in-slag emulsions.

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References

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Authors and Affiliations

  1. Dept., of Metallurgy, University of the Witwatersrand, Johannesburg, S. Africa

    R. C. Urquhart (graduate student)

  2. Dept, of Metallurgical Engineering, McGill University, Montreal, Canada

    W. G. Davenport (Associate Professor)

Authors
  1. R. C. Urquhart
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  2. W. G. Davenport
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Additional information

The precise meaning of S can be seen by considering the example of an oil layer floating on water: the total surface energy of the combination being γoil/air + γwater/oil. The oil can form an emulsion droplet (of negligible surface area) leaving a water/air interface of energy γwater/air. The latter situation will be stable if γwater/air (γoil/air + γwater/oil); i.e., if S is negative.

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Urquhart, R.C., Davenport, W.G. Stabilization of Metal-in-Slag Emulsions. JOM 22, 36–39 (1970). https://doi.org/10.1007/BF03355645

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  • DOI: https://doi.org/10.1007/BF03355645

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