Experimental study on dephosphorization of ferromanganese melt by BaCO_3-based flux

The dephosphorization experiments of ferromanganese melt with w(,i) =0 084%～0 245%by BaCO 3 BaF 2 MnO 2 flux were performed in a MoSi 2 furnace at 1 300 ℃.The results show that so long as the flux composition is changed and dephosphorization time is suitable,about more than 50% phosphorization in ferromanganese melt with different Si contents can be moved into slag.Manganese was not lost during the dephosphorization treatment by BaCO 3(w(BaCO 3)=60%～70%) BaF 2(w(BaF 2)=10%) MnO 2(w(MnO 2)=20%～30%) flux.The optimum time of dephosphorization and Mn keeping is about 10 to 15min.The oxygen potential in ferromanganese melt during dephosphorization is reached to a certain value about 5min and then changes only in a narrow range.When MnO 2 decreases from 30% to 10% and BaCO 3 increases from 60% to 80% in BaCO 3 based flux,the maximum dephosphorization rate and the oxygen potential relative to this maximum dephosphorization rate almost don't change.The oxygen potential relative to this maximum dephosphorization rate changes from 0 35×10 -6 to 0 50×10 -6 .