Effect of Cooling Condition and Oxidation of P-concentrated Slag on Phosphorus Dissolution Behavior

It is expected that phosphorus-concentrated slag produced by using the pyro-reaction between high phosphorus hot metal, which was prepared reduction of usual steelmaking with a small amount and oxidizing can become an important resource instead phosphate rock. For separating from slag, citric acid leaching method has been reported to be available. In this study, effects cooling condition oxidation treatment on dissolution behaviors other elements were discussed. Compared slow-cooled CO2 blowing-quenched did not affect but decreased iron. Oxidation increased ratio about twice iron one-sixth. confirmed microscopic analysis mineral phases in these slags concentration SiO2 FeO solid-solved 3CaO·P2O5 (C3P) phase slow cooling, they precipitated as fine Fe2O3–SiO2 compound C3P oxidation. Furthermore, behavior investigated. Experimental results showed C3P–2CaO·SiO2 dissolved easily C3P–3FeO·P2O5 hardly. From those experimental findings, it presumed change due conditions attributed phase.