Abstract: In comparison with conventional column flotator, the staticmixing magnetic cyclone(SMMC) type column flotator developed by Northeast University of Technology has a series of advantages: lower column body; simpler structure of air charger; convenient mounting and maintenance outside column; larger aeration quantity; less bubble size; improving recovery of fine-grained particles; air-slurry mixing outside column; increasing of flotation efficiency. Using the 2m-hight column flotator for reverse flotation of difficultly concentrating iron ore of Donganshan Mine (in Anshan, China) can get following indexes: for tailings: output -48.8%, iron content -7.79%; for rougher concentrate: iron content -52.67%; recovery -90.7%.