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Determination and Prediction of Water Vapor Solubilities in CaO-MgO-SiO2 Slags

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Abstract

A thermogravimetric technique has been used to obtain accurate measurements of water vapor dissolution in molten CaO-MgO-SiO2 slags. These measurements indicate that the solubility of water vapor is independent of temperature over a 200 °C range (1375 to 1575 °C) and varies directly with the square root of the water vapor partial pressure. Water vapor was observed to be amphoteric in nature with respect to dissolution in liquid silicates. A minimum in solubility was observed at approximately the metasilicate composition. Results obtained during the present study indicate that the empirically defined basicity index(N Cao + NMgo)/Nsio2 is inadequate to describe the dissolution of water vapor in silicate melts. The activity of silica has been identified as a more accurate indicator. Based on this approach, ambiguous results from previous studies in the CaO-MgO-SiO2 slag system have been rationalized. From a statistical evaluation of the data, a relationship in terms of the activity of silica has been obtained which permits calculation of water vapor contents in CaO-MgO-SiO2 slags.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, University of Toronto, M5S 1A4, Toronto, ON, Canada

    D. J. Sosinsky (Graduate Student) & A. McLean (AISI Distinguished Professor)

  2. Institute of Industrial Science, University of Tokyo, 22-1, Roppongi 7 Chome, Minato-ku, 106, Tokyo, Japan

    M. Maeda (Assistant Professor)

Authors
  1. D. J. Sosinsky
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  2. M. Maeda
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  3. A. McLean
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Additional information

M. Maeda, formerly Postdoctorate Fellow in Metallurgy and Materials Science, University of Toronto.

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Sosinsky, D.J., Maeda, M. & McLean, A. Determination and Prediction of Water Vapor Solubilities in CaO-MgO-SiO2 Slags. Metall Trans B 16, 61–66 (1985). https://doi.org/10.1007/BF02657489

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  • DOI: https://doi.org/10.1007/BF02657489

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