P2O5对CaO-SiO2-FetO-P2O5渣中富磷相的影响

以CaO-SiO₂-Fe_tO-P₂O₅四元渣系为研究对象，结合理论计算和热态实验综合分析 P₂O₅含量变化对该四元渣系物相组成以及富磷相的影响。应用Factsage软件equilib模块计算CaO-SiO₂-Fe_tO-P₂O₅四元渣系在400~1800℃温度区间的多相平衡，再结合SEM+EDS与XRD对热态实验结果进行分析知，随着渣中P₂O₅含量的增加，富磷相中Ca₃(PO₄)₂的含量随之增加。此外，P是以nC₂S-C₃P固溶体的形式存在于富磷相中，但当渣中P₂O₅含量达到18%时，富磷相中的P将以Ca₃(PO₄)₂的形式独立存在。热态实验的分析结果进一步验证了Factsage的理论计算结果。

Effect of P2O5 on Rich Phosphorus Phase of CaO-SiO2-FetO-P2O5 Slag

CaO-SiO₂-Fe_tO-P₂O₅ slag was set as the study object in this paper, and the effect that the content of P₂O₅ has on mineralogical morphology and phosphorus occurrence form were studied by combing theoretical calculation and the experiment. By using equilib section in Factsage software to calculate the polyphase equilibrium of CaO-SiO₂-Fe_tO-P₂O₅ slag from 400-1800℃ and analyzing the experimental results by the method of SEM+EDS and XRD, it can be known that the content of Ca₃(PO₄)₂ in the rich phosphorus phase increases as the content of P₂O₅ in the slag increases. The general existence form of P in the rich phosphorus phase of steel slag is nC₂S-C₃P, but when the P₂O₅ content in the slag is more than 18%, phosphorous in the rich phosphorus phase will exist as Ca₃(PO₄)₂ without combing with 2CaO·SiO₂. The analyzing results of the experiment verified the theoretical calculation results of Factsage further.