Carbon Reduction Rate of Phosphorus in Oxide Melt

Abstract

The reduction rate of P₂O₅ in a 50mass%CaO-50mass%Al₂O₃ melt and a dephosphorization slag by carbon was investigated. The apparent rate constant of the reduction reaction of P₂O₅ in the 50mass%CaO-50mass%Al₂O₃ melt by carbon is determined. The activation energy for the reduction reaction of phosphorus in dephosphorization slag is calculated to be E=473 kJ/mol, and the chemical reaction is considered to be the rate-limiting step. Because the FeO content of the dephosphorization slag is much lower than that of the converter slag, the phosphorus is removed by the gasification, and it is expected that the separation and recovery of the phosphorus is possible.