Mechanism of Phosphorus Enrichment in Dephosphorization Slag Produced Using the Technology of Integrating Dephosphorization and Decarburization

In order to better understand and develop the technology of integrating dephosphorization decarburization in a single converter (abbreviated as IDDSC), relevant thermodynamic issues were discussed by calculation. Based on calculation, bridges between phosphorus distribution ratio, temperature, slag composition constructed. Besides, connections behavior microstructure also established investigating four heats hot metal smelt using IDDSC technology. As result, mechanism enrichment was revealed. Also, results show that efficiency increases gradually with increasing basicity. While first then decreases increase FeO content slag. There is competition relationship P2O5 reacting CaO SiO2. When CaO/FeO relatively high, not enough provided. Thus priority react SiO2 through [3n + 2](CaO) 2SiO2 n(P2O5) = n(3CaO·P2O5)-2CaO·SiO2(s), generating P2O5-rich nC2S-C3P solid solution which promotes removal [P] from metal. low, competes over a(CaO) b(SiO2) c(FeO) aCaO·bSiO2·cFeO(s), CaFeSiO4 instead solution. consequence, low shows poor ability.