Microscopic reaction mechanism between homogeneous CaO–SiO₂–FeO–P₂O₅ slag and solid CaO at 1573 K

Abstract

In order to clarify the reaction behaviour systemically between CaO and dephosphorisation slag, the solid CaO piece was dipped into the liquid slag and reacted for 5–300 seconds at 1573 K, the reaction mechanism between homogeneous CaO–SiO₂–FeO–P₂O₅ slag and CaO was investigated in the present study. The results shows that 2CaO·SiO₂ and 3FeO·P₂O₅ are the main phases in dephosphorisation slag, the enrichment phase of phosphorus were formed very fast in <5 seconds. Compared with the results in the previous study, the contents of P₂O₅ in the 2CaO·SiO₂–3CaO·P₂O₅ solid solution increased in this study.

Keywords:

• Homogeneous CaO–SiO₂–FeO–P₂O₅ slag
• Phosphorus enrichment phase
• Solid CaO
• Dephosphorisation