溶銑脱りん速度に及ぼす撹拌力,酸素供給速度の影響

抄録

Study was made on the desiliconization and dephosphorization reaction kinetics at various size equipments. Coupled reaction model was employed to analyse the rate determining step of desiliconization and dephosphorization reaction.
By model calculations, the rate determining step of desiliconization reaction is the mass transfer process in the hot metal and mass transfer both in hot metal and slag for dephosphorization reaction. The mass transfer coefficient in hot metal k_m proportionally increased with 0.7 power of parameterε d/²_c, independently on the equipment size, where, ε, d_eis the stirring energy of hot metal and the diameter of vessel, respectively.
Apparent rate constant of dephosphorization kp' =ln ([%P]_i/[%P]_f)/t_f increased from 0.10min^-1 to 0.33min^-1 when stirring energy ε' and the rate of oxygen supply Vo₂ was increased under the optimum relationship between ε' and Vo₂ which is predicted by the model calculations, where [%P]_i and [%P]_f is initial and final phosphorus content and t_f, refining time. This optimum relationship was expressed as the empirical equation, ε'=1.51 Vo₂² +3.31Vo₂ under the condition of this study.