Abstract:The oxygen-enriched side blown smelting technology for lead concentrate has many advantages, such as a wide range of raw materials, long service life of the furnace body, and high utilization rate of waste heat and materials. It plays an important role in the lead smelting process. The VOF multiphase flow model coupled with the realizable k-ε turbulence model were performed to numerically simulate the multiphase turbulent flow in a industrial side blown smelting furnace, and the reliability of the simulation was verified by cold physical model. The simulations focused on the mixing effect of the molten bath under different operating conditions, including the gas injection velocity, nozzle arranged structure, and slag layer height. It is determined that under the original lance arranged structure, a gas velocity of 100-150 m/s and a liquid level height of 1.6-1.7 meters can achieve good mixing effect.