Abstract:The fluctuating behavior in the settling region influences the slag-metal separation after the reaction in the bottom-blowing bath smelting furnace,. Researching and adjusting the fluctuation behavior of the sedimentation zone is beneficial to improve the direct metal yield. The cold model experiment setup was designed to investigate the fluctuation of liquid surface in the bottom-blowing bath smelting furnace. According to the analysis of the single factor experimental results, appropriately increasing diameter and inclination angle of oxygen lance, reducing the gas flow rate and liquid surface height, can effectively slow down the violent level of liquid level in the settlement area. An excessively large inclination angle of the oxygen lance will cause the position of the settlement zone to move backward, which is not conducive to slag-metal separation and affects metallurgical efficiency.