Abstract:Large-scale bottom-blowing furnace is an important development trend of current oxygen bottom-blowing copper smelting technology, but stirring status of large-scale bottom-blowing furnace is not clear. Taking a large-scale oxygen bottom-blowing furnace as research object, an equivalent simplified model of large-scale bottom-blowing furnace was established. The "quasi-steady state" process of large-scale bottom-blowing furnace was analyzed, flow conditions of large-scale bottom-blowing furnace was explored, and bath gas holdup, average melt velocity and turbulent kinetic energy were selected as evaluation indicators of large-scale oxygen bottom-blowing molten pool. Influence of thickness of slag layer, injection flow rate and angle of oxygen lance on flow of molten pool were studied. The results show that stirring of molten pool is better under the conditions including thickness of slag layer of 65—70 cm, injection flow rate of 0.60—0.65 kg/s, and angle of oxygen lance of 30°—40°.