Abstract: The study on the relationship between graphite crystal structure characteristics and flotation rate is of great significance. The contact angle test， crystal structure characteristics analysis and flotation rate test were carried out for graphite concentrates from Mozambique， Hubei Yichang， Jilin Wangqing and so on. The results showed that: ① Large flaky graphite and dense crystalline graphite generally have relatively large contact angles， while fine flaky graphite and aphanitic graphite generally have relatively small contact angles. ② The axial length a0 and c0 of graphite crystal in various graphite concentrates ranges from 0.246 51 to 0.248 27 nm and 0.671 29 to 0.675 68 nm respectively. The cell volume V ranges from 0.035 33 to 0.035 99 nm3， and the graphitization degree ranges from 68.78% to 94.57%. The large flaky graphite is with smaller cell volum， more complete crystal structure and higher graphitization degree. While the edge of the fine flaky graphite and aphanitic graphite crystal structure is connected with more oxygen-containing functional groups， and showed more crystal defects and lower graphitization degree. There is a negative correlation between content of 3R-polytypic and graphitization degree in graphite crystals. ③ The flotation rate of graphite concentrate accords with the classical first-order kinetic model. The graphitization degree is positively correlated with the flotation rate. The higher the graphitization degree is， the faster the flotation rate is and the higher the fixed carbon content of the concentrate is. Large flaky graphite generally has a higher degree of graphitization， and its flotation rate is faster than fine flaky graphite and aphanitic graphite， so its concentrate has a higher fixed carbon contents.

Key words: contact angle tests, cell volume, graphitization degree, content of 3R-polytypic, flotation rate