The finely disseminated hematite-magnetite ore with a TFe grade of 34.31% from Hunan was taken in a research, and a process of rough grinding followed by low intensity magnetic separation (LIMS) was adopted to separate magnetite from hematite. The roughing concentrate was then subjected to regrinding and two-stage cleaning to obtain magnetite concentrate. And the obtained LIMS tailings were then subjected to regrinding, high intensity magnetic separation (HIMS) and reverse flotation for purification, generating hematite concentrate. Based on condition tests, a whole-process test was carried out, producing a magnetite concentrate grading 62.08% TFe at 22.75% recovery, and a hematite concentrate grading a 65.22% TFe at 47.87% recovery. The total iron concentrate was obtained grading 64.17% TFe at 70.62% recovery, and the contents of harmful elements P and S were lower than 0.05%. It is shown that this processing technique can achieve comprehensive recovery of hematite and magnetite through staged grinding and the separation between magnetite and hematite. The produced concentrate has its indicators up to the follow-up requirements for iron-making raw materials.

hematite  /  magnetite  /  iron concentrate  /  fine dissemination  /  mixed ore  /  phase-separation and stepwise recovery  /  high intensity magnetic separation (HIMS)  /  reverse flotation