Abstract: The effects of rotor rotation speed and inert gas flow rate on rotary degassing efficiency are studied by using water simulation and direct aluminum melt degassing experiments and the mechanisms have been further discussed. The results show that the rotor rotation speed and gas flow rate in the rotary degassing process greatly affect the degassing efficiency. With increasing rotor rotation speed， the bubble size decreases and the affected region becomes larger， therefore the gas removal rate increases. When the gas flow rate in a certain range increases， the number of bubbles increases， corresponding to an improved gas removal efficiency. However， when the gas flow rate raises too high， the degassing efficiency decreases due to the reduce of affected region， which comes from the isolation of the gas layer formed between the rotor and melt. In the study， the appropriate parameters of the rotation speed and inert gas flow rate in the process are 550~690r/min and 1~3L/min， respectively.

Key words: 2524 aluminum alloy, rotary degassing, water simulation, rotor rotation speed, gas flow rate