Removal of phosphorus from synthetic oxide melts

The behavior of phosphorus in FeO-Fe 2 O 3 -CaO-MgO-SiO 2 -Al 2 O 3 -P 2 O 5 oxide melts is experimentally studied. To determine the factors affecting the removal of phosphorus from the oxide melt to the gas phase, experiments are conducted with different melt basicity (CaO/SiO 2 ) and with differen...

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Published inSteel in translation Vol. 44; no. 7; pp. 477 - 480
Main Authors Krasnyanskaya, I. A., Podgorodetskii, G. S., Paderin, S. N.
Format Journal Article
LanguageEnglish
Published Heidelberg Allerton Press 01.07.2014
Springer Nature B.V
Subjects
Basicity
Chemistry and Materials Science
Diffusion
Liquid phases
Mass transfer
Materials Science
Melts
Oxides
Phosphorus
dephosphorization
kinetic equation
limiting stage
apparent activation energy
acidic slag
Arrhenius equation
oxide melt
liquid-phase diffusion
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Summary:The behavior of phosphorus in FeO-Fe 2 O 3 -CaO-MgO-SiO 2 -Al 2 O 3 -P 2 O 5 oxide melts is experimentally studied. To determine the factors affecting the removal of phosphorus from the oxide melt to the gas phase, experiments are conducted with different melt basicity (CaO/SiO 2 ) and with different CO/CO 2 ratios in injection. The removal of phosphorus is greatest when the basicity is 0.5. At higher basicity, thermodynamic factors hinder the removal of phosphorus; at lower basicity, the viscosity of the melt is a hindrance. In kinetic calculations, the apparent activation energy of the process is found to be E = 140 ± 56 kJ/mol. That suggests that the process is limited by the diffusional mass transfer of phosphorus pentoxide in the liquid phase.
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ISSN:0967-0912
1935-0988
DOI:10.3103/S0967091214070134