Abstract: For Guizhou Hezhang Oolitic Hematite,made experimental study on fineness of grinding mineral products, Collectors choice and dosage, Inhibitor content. The results show that when fineness of grinding minerals is -0.074 mm of 85%, roughing combined collector GE-609 and RAP-138 is 200 g/t respectively, doseage of starch is 1 400 g/t, adopt one time reverse-floating roughing processes, and obtain Iron ore concentrate which iron grade is 57.82%, recovery rate is 73.69% ,Phosphorus is 0.22%.

Key words: Oolitic Hematite, Reverse-floating, Combined collector