EXPERIMENTAL INVESTIGATION ON DISSOLVING OXYGEN IN HOT METAL PRETREATMENT

The changing law of oxygen potential was studied during hot metal pretreatment by using Fe₂O₃-CaO-CaF₂ and Na₂CO₃-Na₂SO₄ fluxes under the laboratory conditions. At the same time, the suitable range of oxygen potential for removing phosphorus and sulfur simultaneously was discussed. The results show that the oxygen potential in iron melt during dephosphorization can be reached to 5.911×10^-6~10.03×10^-6 in 5 min and then changes only in a narrow range. The final [P] content of 0.008%~0.012% and sulphur content of 0.003%~0.007% can be obtained at 1 623 K if the oxygen potential is controlled in the range 3.0×10^-6~6.5×10^-6.