Experiments have been made to study the phosphorus distribution between carbon-saturated iron and lime-based melts containing MnO, BaO, Na₂O in the temperature range of 1250-1350°C under a CO atmosphere.
The results are summarized as follows:
(1) The phosphorus equilibrium distribution between CaO-CaF₂ SiO₂-MnO melts and carbon-saturated iron decreases with increasing manganese oxide content in slaps.
(2) BaO and Na₂O have a beneficial effect on the phosphate capacity of the slags for the systems: CaO-CaF₂-SiO₂-MnO-BaO and CaO-CaF₂-SiO₂-MnO-Na₂O.
(3) Increasing CaF₂ content in the range of 25 to 40% decreases the phosphorus equilibrium distribution.
(4) The temperature dependence of equilibrium phosphorus distributions can be expressed as follows: log L_p=13300/T-8.84
The heat of reaction of dephosphorization was -130kcal per mole of Ca_1.5PO₄.