1994 Volume 80 Issue 3 Pages 207-212
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 km proportionally increased with 0.7 power of parameterε d/2c, independently on the equipment size, where, ε, deis the stirring energy of hot metal and the diameter of vessel, respectively.
Apparent rate constant of dephosphorization kp' =ln ([%P]i/[%P]f)/tf 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 tf, refining time. This optimum relationship was expressed as the empirical equation, ε'=1.51 Vo22 +3.31Vo2 under the condition of this study.