Abstract: Aiming at the problem that the flotation index of a copper concentrator in Heilongjiang Prov⁃ ince is not ideal，the flotation kinetic performance test and analysis were carried out. The JJF-320 and KYF-320 flotation machines of series I roughing operations were taken as the research objects. The key ki⁃ netic parameters such as air volume，air dispersion，gas holdup，slurry suspension capacity and bubble loading rate were systematically tested. The results show that the air dispersion effect in the flotation ma⁃ chine is good. Compared to the JJF-320，the KYF-320 exhibited a slightly higher aeration rate，which could be moderately reduced based on actual production needs.The gas holdup in the two flotation machines is within a reasonable range and evenly distributed. The ore particles in the two flotation machines are fully suspended. The bubbles in the two flotation machines have strong ore carrying capacity，and there is no obvi⁃ ous desorption phenomenon during the rising process，and the mineralization effect is excellent. The re⁃ search provide a theoretical basis for the optimization of the operation parameters of flotation equipment， which is helpful to improve the separation efficiency and process adaptability.

Key words: copper mine, flotation machine, air dispersion rate, slurry suspension capacity, bubble loading rate