Mass Transfer Behavior of Phosphorus from the Liquid Slag Phase to Solid 2CaO center dot SiO2 in the Multiphase Dephosphorization Slag

作者：Xie, Senlin; Wang, Wanlin^*; Luo, Zhican; Huang, Daoyuan

来源：Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2016, 47(3): 1583-1593.

DOI：10.1007/s11663-016-0622-0

• MEDIUM-CARBON STEELS
• FLUORINE MOLD FLUX
• CAO-SIO2-FETO SLAGS
• DICALCIUM-SILICATE
• CALCIUM-PHOSPHATE
• P2O5
• SYSTEM
• B2O3
• MECHANISM
• GLASSES

The mass transfer behavior of phosphorus in the multiphase dephosphorization slag at 1623 K (1350 A degrees C) is investigated in this article by adding the reagent P2O5 powders into the CaO-FeOt-SiO2 slag saturated with a directly precipitated 2CaO center dot SiO2 phase. The results show that the phosphorus was first quickly dissolved and transferred from the liquid slag to the precipitated solid 2CaO center dot SiO2 particle; then it reacted with the solid 2CaO center dot SiO2 particle to form (2CaO center dot SiO2-3CaO center dot P2O5) solid solution at the edge of a large solid particle. The further diffusion of phosphorus from the formed (2CaO center dot SiO2-3CaO center dot P2O5) solid solution reaction layer into the core of the 2CaO center dot SiO2 particle is the limiting step during the enrichment-phosphorus process. It is observed that the enrichment-phosphorus process is changed when the amount of added P2O5 content is increased and the formed solid solution phase is torn and peeled off from the surface of the 2CaO center dot SiO2 particle. In addition, the study shows that the solid solution structure is changed and becomes more compacted with the addition of P2O5 content, leading to the increment of solid solution density.

• 出版日期2016-6
• 单位中南大学