EQUILIBRATING PARTITION RATIOS OFNb,Mn AND Si BETWEEN LIQUID IRON AND MgO-SiO_2-MnO SLAG MELTS

The liquid iron containing elements Nb,Mn and Si has been equilibratedwith MgO-SiO_2-MnO slag melts at 1600℃ in a Mo wire-wound resistance furnace with aduration of 4h.The oxygen activities in liquid iron were measured with oxygen sensors.Usingthe known equilibrium constants of concerning reactions and the oxygen activities in liquidiron,the activities of components in the slag melts can be calculated.It was found that the par-tition ratios of Nb.Mn and Si have a close linear relationship with α_(FeO) in logarithmicscale.The dependence of Nb partition ratio on mole fractions of the slag components was al-so obtained.