What are the basic conditions for steelmaking dephosphorization? Write the chemical reaction formula.
Keywords: steelmaking dephosphorization
Under steelmaking conditions, P cannot be directly oxidized and removed by oxygen. Only the combination of oxides (P2O5) and (CaO) to generate stable and complex compounds can be effectively removed.
The influencing factors are:
(1) Slag basicity: Increasing R can improve the effect of P removal, but if R is too high, the slag becomes sticky, which is not conducive to P removal.
(2) The effect of (FeO): increase the FeO content in the slag and improve the P removal ability.
(3) The influence of temperature: The P removal reaction is a strong exothermic reaction. Appropriately lowering the temperature is beneficial to P removal. (4) Slag amount: increasing the amount of slag can reduce the P content in steel. (5) Slag viscosity: P removal is the interface reaction of steel slag, reducing the slag viscosity is beneficial to the progress of the P removal reaction.
2[P]＋5(FeO)＋4(CaO)=(4CaO·P2O5)＋5[Fe]
2[P]＋5(FeO)＋3(CaO)=(3CaO·P2O5)＋5[Fe]
