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Removal of phosphorus from CaO-SiO2-MgO-Al2O3-P2O5 melts to the gas phase

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Abstract

The behavior of phosphorus in CaO-SiO2-MgO-Al2O3-P2O5 melts is studied experimentally, so as to determine the potential for the removal of phosphorus from oxide melts to the gas phase. To identify the factors that affect the removal of phosphorus from oxide melts to the gas phase, experiments are conducted with different basicity CaO/SiO2 and with the injection of N2, Ar, and CO + CO2 mixture (with different CO/CO2 ratios). It is established that the basicity is the main factor affecting the transfer of phosphorus from the oxide melt to the gas. When the basicity is 1.0 or less, phosphorus is removed from oxide melts. At higher basicity, no transfer of phosphorus from the oxide melt to the gas is observed. These findings are confirmed by calculations based on the theory of regular ionic solutions for acidic slag, at different basicity values. Calculations show that, when the basicity is 1.05 or less, the activity of SiO2 exceeds that of CaO, and correspondingly SiO2 displaces P2O5 from its strong compound with CaO. That creates favorable conditions for the transfer of phosphorus from the oxide melt to the gas.

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Authors and Affiliations

  1. Moscow Institute of Steel and Alloys, Moscow, Russia

    I. A. Krasnyanskaya & G. S. Podgorodetskii

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  1. I. A. Krasnyanskaya
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  2. G. S. Podgorodetskii
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Correspondence to I. A. Krasnyanskaya.

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Original Russian Text © I.A. Krasnyanskaya, G.S. Podgorodetskii, 2014, published in “Izvestiya VUZ. Chernaya Metallurgiya,” 2014, No. 5, pp. 41–46.

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Krasnyanskaya, I.A., Podgorodetskii, G.S. Removal of phosphorus from CaO-SiO2-MgO-Al2O3-P2O5 melts to the gas phase. Steel Transl. 44, 345–349 (2014). https://doi.org/10.3103/S0967091214050076

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  • DOI: https://doi.org/10.3103/S0967091214050076

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