Abstract: There is 33.28% iron in a low-grade hematite ore from Donganshan.Iron mainly exists in form of hematite and magnetite，with distributive ratio of 86.47%.3.29% of the iron exists in form of siderite，which would have bad effect on flotation operation.Twice stages grinding-classification-gravity separation by spiral chute on coarse particles，middlings of gravity separation reground and then mixed with fine magnetic concentrate，the mixture endure flotation operation is selected for on-site process.The existing process has problems of high grade tailings，small capacity in gravity separation，low yield rate and iron recovery.Twice stage grinding stage magnetic separation，one roughing-one cleaning-three scavenging reverse flotation process on reground magnetic concentrate is conducted on run-of-mine ore from Donganshan.Iron concentrate with iron grade of 65.32% and recovery of 75.71%，tailings of 13.38% Fe were obtained.Compared with the original technological process，the iron grade increased by 0.58 percentage points and the recovery rate increased by 10.43 percentage points，and the process is simple and easy to be realized.The experiment results has important guiding significance for beneficiation index improving of the hematite ore in the Donganshan，and can provide reference for the development and utilization of the ore in same type.

Key words: Hematite, Stage grinding stage separation, Magnetic separation, Mixed magnetic concentrate, Reverse flotation