Phosphorous partition between 2CaO•SiO2 particles and CaO-SiO2-FetO slags

The behavior of phosphorous transfer from P2O5-containing CaO-SiO2-FetO slags to 2CaO center dot SiO2 particles homogeneously dispersed in slag has been studied by using a microprobe analysis. The maximum phosphorus distribution ratio between 2CaO center dot SiO2 particle and slag is obtained at the nose composition of 2CaO center dot SiO2 primary phase region in CaO-SiO2-FetO phase diagram and the temperature dependence of this distribution ratio is small. The phosphorous transfer rate from slag to a 2CaO center dot SiO2 particle with 20 to 50 mu m is considerably fast and a 2CaO center dot SiO2 particle changes to the particle with the composition of 2CaO center dot SiO2-3CaO center dot P2O5 solid solution within 5 s. In the case of particles present in cluster, only the rim part (5 mu m) of a particle changes to the composition of 2CaO center dot SiO2 - 3CaO center dot P2O5 solid solution within 5s, but small size particles with 3 to 8 mu m completely change to the particles with the composition of 2CaO center dot SiO2 - 3CaO center dot P2O5 solid solution within 5