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In order to analyze the effect of rotation speed of impeller on the inner flow and floatation dynamics characters of mechanical floatation, a kind of floatation is investigated.The gas-solid-liquid three-phase three-dimension turbulent flow fields are analyzed numerically with the Mixture multi-phase model, K-ε turbulent model and Reynolds-Averaged Navier-Storkes equations.The void fraction test result of physical prototype is given with different rotation speed.