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The effect of Na2O on dephosphorization by CaO-based steelmaking slags

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Abstract

The effect of Na2O on the equilibrium phosphorous distribution ratio between slag and iron or iron alloys, LP, has been measured for CaO-SiO2, CaO-FeOr-SiO2 (CaO or 2CaO·SiO2 saturated), and CaO-Al2-SiO2 slags. The addition of Na2O to CaO-SiO2 slags significantly increases LP and the phosphate capacity. A 25 pct CaO-25 pct Na2O-SiO2 slag has a distribution ratio nearly two orders of magnitude greater than a comparable binary 50 pct CaO-SiO2 slag. For the CaO-saturated slags containing 40 wt pct FeOT, the addition of 6 wt pct Na2O increases LP by a factor of 5. For the 2CaO·SiO2-saturated CaO-FeOT-SiO2 slag, there is an optimum FeOr content (20 wt pct) for dephosphorization, and 10 wt pct Na2O increases LP by a factor of 2. For reducing slags typically used in ladle metallurgy for Al-killed steels (50 pct CaO-40 pct Al2O3-10 pct SiO2), as little as 3 wt pct Na2O increases LP by a factor of 100. The present results indicate that small additions of Na2O to conventional steelmaking slags can greatly improve dephosphorization.

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Authors and Affiliations

  1. RIST, Pohang Steel, Pohang, Korea

    J. J. Pak (Senior Research Engineer)

  2. Department of Metallurgical Engineering and Materials Science, Carnegie Mellon University, 15213, Pittsburgh, PA

    R. J. Fruehan (Professor)

Authors
  1. J. J. Pak
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  2. R. J. Fruehan
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Formerly Graduate Student, Department of Metallurgical Engineering and Materials Science, Carnegie Mellon University.

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Pak, J.J., Fruehan, R.J. The effect of Na2O on dephosphorization by CaO-based steelmaking slags. Metall Trans B 22, 39–46 (1991). https://doi.org/10.1007/BF02672525

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  • DOI: https://doi.org/10.1007/BF02672525

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