Reaction Behavior of P_2O_5 at the Interface between Solid 2CaO・SiO_2 and Liquid CaO-SiO_2-FeO_x-P_2O_5 Slags Saturated with Solid 5CaO・SiO_2・P_2O_5 at 1573K

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It is important to understand the role of solid phases such as solid CaO or 2CaO·SiO2 in hot metal dephosphorization. In the present study, the reaction behavior of P2O5 at the interface between solid 2CaO·SiO2 and liquid CaO–SiO2–FeOx–P2O5 slags saturated with solid 5CaO·SiO2·P2O5 at 1573 K was investigated.The result shows that the solid 2CaO·SiO2 reacts with the liquid phase in the two phase mixture to form the P2O5 condensed phases. Compared with the results by using the homogeneous slag as reported in the previous papers, the formation of P2O5 condensed phases is more evident and the back dissolution of P2O5 condensed phases into the surrounding slag is restrained in this study. These results indicate that the dissolution of P2O5 condensed phases can be considerably restrained in the case that the bulk slag is saturated with solid 5CaO·SiO2·P2O5 before reaction.
社団法人日本鉄鋼協会の論文
2010-05-15