The distribution of P in basic oxygen furnace steelmaking slag was investigated together with the enrichment behaviours of P in slowly cooled slag samples modified by SiO 2 from high temperature remelts at 1873 K. The slag microstructures were characterised, and the results showed that only a limited fraction of P 2 O 5 was dispersed in the matrix, whereas a large amount of P 2 O 5 was found to form solid solutions with dicalcium silicate (2CaO.SiO 2 or C 2 S) phase and/or with tricalcium silicate (3CaO.SiO 2 or C 3 S) phase in original industrial slag. It was also found that when the basicity (C/S5CaO/SiO 2 ) of slag modified by SiO 2 was close to 3, the main phase was C 2 S, and most of the P in the modified slag was precipitated from solid solution in the C 2 S. The mechanism of P enrichment is also discussed.
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