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Some observations on the draining of CaO-SiO2-Al2O3 slag bubble films

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Abstract

Fundamentals of slag foaming were investigated by withdrawing slag bubble films from pools of CaO-SiO2-Al2O3 slags using platinum wire frames in order to measure their draining rate and lifetime before rupture. Studies were carried out using a series of developed gravimetric and optical techniques. The results showed that increasing the temperature increased the rate of draining of the slag films; however, the influence of SiO2 concentration for a given slag temperature appears rather complicated. Measurements of the thickness of bubble film plateau borders as a function of time showed slag temperature to be very important in influencing their draining behavior, i.e., the activation energy for the plateau-border thinning was found to be ∼ 150 kJ/mol, very close to that required for viscous flow in the system studied (∼60 kJ/mol). A lowering of the slag surface tension by addition of surface-active oxides (such as P2O5 and Na2O) profoundly decreased the rate of draining of the films, irrespective of the slag temperature.

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Authors and Affiliations

  1. the G.K. Williams Cooperative Research Centre for Extractive Metallurgy, CSIRO Minerals, 3169, Victoria, Australia

    C. Nexhip (Research Scientist), S. Sun (Principal Research Scientist) & S. Jahanshahi (Research Manager and Senior Principal Research Scientist)

Authors
  1. C. Nexhip
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  2. S. Sun
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  3. S. Jahanshahi
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Additional information

This article is based on a presentation made in the “Geoffrey Belton Memorial Symposium,” held in January 2000, in Sydney, Australia, under the joint sponsorship of ISS and TMS.

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Nexhip, C., Sun, S. & Jahanshahi, S. Some observations on the draining of CaO-SiO2-Al2O3 slag bubble films. Metall Mater Trans B 31, 1105–1115 (2000). https://doi.org/10.1007/s11663-000-0086-z

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