The recoverability of phosphorus oxide from steelmaking slag was investigated using a mechanical approach involving capillary action. It was found that P2O5 was concentrated in the 2CaO·SiO2 phase. To separate the P2O5-enriched solid 2CaO·SiO2 phase and FeO-rich liquid phase in steelmaking slag, capillary action was used to facilitate penetration into absorbers such as sintered CaO, Fe2O3, and CaCO3 tablet. Once the liquid phase had penetrated the absorber, it was found that the solid 2CaO·SiO2 phase and FeO-rich phase could be effectively separated. When CaCO3 was used as an absorber, 91 % of phosphorus oxide in the steelmaking slag was recovered in solid 2CaO·SiO2 phase. The recovered absorber, which includes a FeO-rich liquid phase, may be used as Fe source, and the 2CaO·SiO2 phase, which includes P2O5, may be used as P source.
ASJC Scopus subject areas
- Environmental Science (miscellaneous)
- Mechanics of Materials
- Metals and Alloys