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The molten steel was dephosphorized by high basic BaO-based slags (BaO-CaO-CaF_2) to achieve ultra low phosphorus level. The dephosphorization ability of the BaO-CaO-CaF_2 slags was tested. The phosphate capacity of this slag system at 1 620 ℃ varied from 10~(18.03) to 10~(19.11) with an activity coefficient of P_2O_5 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.
The molten steel was dephosphorized by high basic BaO-based slags (BaO-CaO-CaF 2) to achieve ultra low phosphorus level. The dephosphorization ability of the BaO-CaO-CaF 2 slags was tested. The phosphate capacity of this slag system at 1 620 ℃ varied from 10 ~ (18.03) to 10 ~ (19.11) with an activity coefficient of P_2O_5 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.