Abstract: On the basis of the analysis of flue slime properties,micro bubble flotation column was used for carrying out the experimental research on the recovery of carbon from flue slime of blast furnace. The influences of collector agent,foaming agent,depressant agent,aeration rate and eluent flow rate and cleaner time on the flotation indexes were investigated by flotation column. The results show that the grade of the final carbon concentrate is 74. 21%,the recovery is 62. 94% and the productivity is 24. 75% with the flow sheet which is single-stage roughing and three-stage cleaning with the dosage of diesel oil is 500g / t,2^#oil is 25g / t,sodium hexametaphosphate is 80g / t,aeration rate is 0. 32m³/ h and eluent flow rate is 0. 015m³/ h.