Abstract: In order to realize the efficient desliming of lepidolite ore before flotation，improve the flo⁃ tation index of lepidolite and the overall economic benefits of the beneficiation process，the application of hydrocyclone in the desliming process of lepidoliteis systematically studied in view of the high slime con⁃ tent in lepidolite ore，the poor suitability of desliming process before flotation，and the difficulty in balanc⁃ ing desliming efficiency and useful mineral recovery.The technical characteristics and application scenarios of three mainstream processes of single-stage cyclone desliming，two-stage overflow series desliming and two-stage grit series desliming are analyzed. The desliming performance test and industrial application veri⁃ fication of cyclones with different specifications are completed.The core desliming indexes under different process modes are obtained. The single-stage FX250 and FX150 cyclones have the highest desliming rate of -71.12% for -0.038 mm grain size，the two-stage overflow series desliming process has the highest des⁃ liming rate of 94.37%，and the two-stage desliming series process has the highest desliming rate of 84.36% for -0.038 mm grain size. The hydrocyclone can accurately adapt to the desliming requirements of different types of lepidolite ore. By optimizing the desliming process and matching the cyclone specifica⁃ tions，the desliming efficiency and the recovery rate of useful minerals can be taken into account to maxi⁃ mize the economic benefits of the lepidolite beneficiation process.

Key words: lithium mica, hydrocyclone, desliming process, series desliming