Abstract: For the gas-liquid reaction process of desulfurization of molten iron with magnesium vapor， the physical simulation method was used to study on the reaction process of desulfurization of molten iron. The high speed camera was used to obtain bubble dispersion phenomena under the conditions of different injection modes， gas flow rates and impeller immersion depth. The first order reaction of NaOH with CO₂ was used to simulate the absorption rate and utilization rate of magnesium vapor in the process of desulfurization. Results show that: under the conditions of centric bottom blowing injection mode， the gas flow rate 2.0m³/h， impeller immersion depth 250mm， the bubble refinement and dispersion in the bath was good. The gas-liquid mass transfer rate and utilization rate of CO₂ bubbles were observably improved.

Key words: bubble refinement and dispersion, desulfurization, physical simulation； absorption rate； CO₂ utilization rate