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首页> 中文期刊> 《矿物冶金与材料学报：英文版》 >Phosphate enrichment mechanism in CaO–SiO_2–FeO–Fe_2O_3–P_2O_5 steelmaking slags with lower binary basicity

Phosphate enrichment mechanism in CaO–SiO_2–FeO–Fe_2O_3–P_2O_5 steelmaking slags with lower binary basicity

         
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The addition of silica to steelmaking slags to decrease the binary basicity can promote phosphate enrichment in quenched slag samples. In this study, we experimentally investigated phosphate enrichment behavior in CaO–SiO_2–FeO–Fe_2O_3–P_2O_5 slags with a P_2O_5 content of 5.00% and the binary basicity B ranging from 1.0 to 2.0, where the(%FetO)/(%Ca O) mass percentage ratio was maintained at 0.955. The experimental results are explained by the defined enrichment degree 2 3C S C PR- of solid solution 2CaO·SiO_2–3CaO·P_2O_5(C_2S–C_3P), where 2 3C S C PR- is a component of the developed ion and molecule coexistence theory(IMCT)–Ni model for calculating the mass action concentrations Ni of structural units in the slags on the basis of the IMCT. The asymmetrically inverse V-shaped relation between phosphate enrichment and binary basicity B was observed to be correlated in the slags under applied two-stage cooling conditions. The maximum content of P_2O_5 in the C_2S–C_3P solid solution reached approximately 30.0% when the binary basicity B was controlled at 1.3.

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