Abstract: To resolve the problem of lower technological and economic indicators in beneficiation of a fine and refractory graphite ore that was exploited for a long time in Sichuan， the times of regrinding and cleaning, the treatment process of low-grade middling and whole closed trial were studied on the basis of roughing conditions trial.The fixed carbon content of the graphite ore sample was 22.46%.The results show that finally the graphite concentrate of fixed carbon grading at 90.47%with recovery of 87.34% was achieved through the whole closed trial, which was once rough grinding ,once roughing and once scavenging, then five times regrinding and six times cleaning to the rough concentrate, one more regrinding and scavenging to the mix of the middling(1~4) and the concentrate of this scavenging merges with the rough concentrate, the middling(5~7) returns to the second regrinding.

Key words: Fine and refractory graphite ore, Regrinding, Cleaning, Middling