Abstract: Since the commissioning of Hematite plant of Nanfen Concentrator, there always exists the problems of low grade Fe concentrate especially the Fe concentrate in flotation (only 59%), and low Fe recovery (only 65%).Therefore, according to the beneficiation practices of the similar mines at domestic, and the nature of Hematite in Nanfeng concentrator of Bensteel group, small beneficiation tests are carried out respectively by the three processes of stage grinding-medium intensity magnetic separation-high intensity magnetic separation-reverse flotation, stage grinding-low intensity magnetic separation-grade increase with fine screening-high intensity magnetic separation-reverse flotation, stage grinding-classification-gravity-magnetic separation-floatation.Then, iron concentrate with Fe grade of over 65% and recovery of over 70% can be realized by each process.The experiments indicates that on-site insufficient grinding leading to low grade concentrate of high intensity magnetic separation and for flotation is the main reason for the non-ideal flotation.

Key words: Hematite, High intensity magnetic separation, Reverse flotation