Abstract: The reverse flotation currently used for treating the concentrate of high intensity magnetic separation (HIMS）of Baiyunebo oxide ore in BaoSteel's concentrator has poor separation performances, affecting the concentrate quality. Tests were therefore made on several processes including single reverse flotation, reverse flotation-positive flotation, and positive flotation-reverse flotation. The results showed that the closed flowsheet of reverse flotation-positive flotation achieved the best results, with the iron concentrate grading 59.32% at a recovery of 64.52%.

Key words: Baiyunebo oxide ore, HIMS concentrate, Single reverse flotation, Reverse flotation-positive flotation, Positive flotation-reverse flotation.