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The reaction behaviour of solid 2CaO·SiO 2  (C 2 S) in steel slag is of great interest during the hot-metal dephosphorization process. In the present work, C 2 S samples were prepared and interfaced with steel slag to investigate the phosphorus diffusion behaviour at the interface of C 2 S at 1723K at the onset of the slag melting. The results showed that the phosphorus diffusion from the slag to C 2 S was very rapid with a significant diffusion coefficient of 4.44 × 10 −9  m 2 ·s −1 . Phosphorus-enriched phases were formed continuously with increasing reaction time. As the reaction time increases, the composition of the diffusion layer becomes closer to 3CaO·P 2 O 5  (C 3 P) and farther away from the C 2 S. The results indicate that a hot-metal dephosphorization process with much higher efficiency can be achieved by the careful selection of the interface characteristics between the C 2 S and steel slag.

Phosphorus diffusion at the interface between 2CaO·SiO 2 and CaO–SiO 2 –FeO–P 2 O 5 slag