The molten steel was dephosphorized by high basic BaO-based slags （BaO-CaO-CaF2） to achieve ultra low phosphorus level. The dephosphorization ability of the BaO-CaO-CaF2 slags was tested. The phosphate capacity of this slag system at 1 620 ℃ varied from 1018.03 to 1019.11 with an activity coefficient of P2O5 ranging from 10-19.47 to 10-18.09. The effect of BaO content, initial phosphorus content and oxygen potential of molten steel on dephosphorization was discussed. The phosphorus pick-up by the BaO-based slags was studied.
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