Abstract: The carbon content of a flaky graphite flotation concentrate in Yichang was 93.72%，-200 mesh accounted for 83.27%.Main impurity compositions were quartz，kaolin and illite.Mixed acid leaching process condition research was performed in order to obtain high purity graphite.The results indicated that the molar ratio of HCl to HF was 1∶4，the volume to mass ratio of mixed acid to graphite was 3∶1 and leaching at 60 ℃ for 6 h，the removal effect of impurities was the best and high purity graphite with fixed carbon content of 99.1% could be obtained.The analysis results of XRD and SEM indicated that acid leaching process could efficiently dissolve the impurities without destroy the component and structure of graphite，thus can be an important method to obtain high purity graphite.

Key words: Flaky graphite, Deimpurity, Mixture acid dissolving