Abstract
Removal of chromium from molten steel is investigated with (CaO-MgO-MnO2)-(SiO2-Al2O3)-Fe2O3 flux in a laboratory scale test.
By using the flux of about 50 kg/t, chromium 60 to 75% is removed from molten steel by oxidation refining, if (1)FeO activity is high, (2)slag basicity, (CaO + MgO + MnO)/(SiO2+ Al2O3) is 1.5 to 2.0, and (3)MgO is added to the flux as a component for accelerating removal of chromium.
In addition, manganese loss in this treatment is suppressed, if (1)MnO2 is added to the flux or (2)carbon is added to the slag after removal of chromium.
