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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 18a
SUMMARY:The effect of oxygen potential on the phosphate capacity of slags containing multivalent species
DESCRIPTION:Phosphate capacity data has been used by steelmakers for many decades to optimize the dephosphorization praxis in various reactors, e.g. the BOF and the EAF. The data is commonly gathered in a laboratory where the partial pressure of oxygen can differ significantly from the industry. The use of this data in the industrial case requires careful consideration. For slag systems containing multivalent slag species, e.g. Fe and Cr, the slag structure will be dependent on the valence state of the ions. This will lead to a variation in the thermochemical properties with the oxygen potential. For instance, the presence of Fe+2 and Fe3+ could lead to a substantial dependence of the phosphate capacity on the oxygen potential. To illustrate the effect of oxygen potential on the phosphate capacity, experiments were carried out in a resistance heated furnace at 1873K. In the experiments, vanadium oxide was used as the multivalent species, to limit the reaction with the crucible. The phosphorus partition between liquid copper and a fully liquid, MgO-saturated, SiO2-MgO-VyOx slag was determined at different oxygen potentials in a controlled atmosphere. To set oxygen potential in the system (1.72 × 10-8 – 1.73 × 10-11 atm), CO-CO2 mixtures were used. The resulting phosphate capacity change one order of magnitude over the investigated oxygen potential range. Based on the present results, the applicability of phosphate capacity data gathered at a different oxygen potential than the prevailing in an industrial process is questionable. In effect the data could even mislead the engineer in its implementation. This is especially the case considering that the oxygen potential in the reactor slag varies with position and even time. Using phosphate capacity data for the process should as such be done cautiously even if the data is gathered at a relevant oxygen potential. 
CLASS:PUBLIC
DTSTART:20230614T094000
DTEND:20230614T100000
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