In order to clarify the reaction behavior of phosphorus in the multi phase flux, the solid 2CaO·SiO
2 piece was reacted with the CaO–SiO
2–FeO
x–P
2O
5 slag for 1 to 180 s at 1573 or 1673 K. The interfaces between the original solid and liquid phases were observed and compositions of both phases were analyzed by SEM/EDS.
The result shows that P
2O
5 is condensed at the rim layer of 2CaO·SiO
2 piece very fast in less than 1 s. The P
2O
5 condensed phases are identified as the mixture of 2CaO·SiO
2–3CaO·P
2O
5 solid solution and the surrounding liquid slag. After reaction for longer time, the reaction behavior of P
2O
5 depends on the reaction temperature and initial slag composition. Reaction temperature and mole ratio of CaO/SiO
2 in the initial slag influence the stability of P
2O
5 condensed phases. Higher temperature induces the dissolution of P
2O
5 condensed phases while larger mole ratio of CaO/SiO
2 has the opposite effect.
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