关键词: 低品位细鳞片石墨, 阶段磨矿, 阶段浮选, 中矿

Abstract: There is 4.30% fixed carbon in a low-grade fine-flake graphite ore from Hubei. Mainly exists in form of scaly graphite，and only very small amounts of aphanitic graphite. There are both single scaly and scaly aggregation，they present bending and microscopic scales under the microscope. It's size are generally 0.001～0.03 mm. In order to determine the appropriate enrichment technology，experiment was done using stage grinding，stage flotation principle process. The results show that finally the graphite concentrate of 90.17% fixed carbon with recovery of 90.38% was achieved through one primary grinding(-0.074 mm of 70%)-one roughing and one scavenging regrinding 1(-0.045 mm of 85%)-first and second cleaning-regrinding 2(-0.045 mm of 98%)-third and fourth cleaning-regrinding 3 (-0.045 mm of 99.73%)-fifth and sixth cleaning，and the middling 1~4 returns to the roughing after scavenging，the middling 5~6 returns to the cleaning 1，the middling 7 returns to the cleaning 5.

Key words: Low-grade fine-flake graphite, Stage grinding, Stage flotation, Middling