Abstract: A hematite mine of Yunnan has a fine dissemination size, where a process consisting of magnetic separation-gravity separation is adopted in production.But the obtained iron concentrate with only Fe grade of 57% can not meet the requirement of pellet production with Fe grade over 62%.In view of this, a concentration test is carried out to improve Fe grade.A combined flow-sheet of stage grinding-stage high intensity magnetic separation-inverse flotation is adopted.When final grinding of 86% -0.038 mm, an iron concentrate with Fe grade of 62.20% and Fe recovery of 56.36% can be obtained. 

Key words: Fine-disseminated Hematite, Stage grinding, High-intensity magnetic separation, Reverse flotation