Abstract: In view of the characteristics of copper-bearing and high pyrrhotite of the magnetic iron ore, beneficiation tests are carried out by the process flow-sheet of low intensity magnetic separation-concentrate inverse flotation desulphurization of low magnetic separation-low intensity magnetic separation of tailings to obtain iron concentrate grading at 66.85% with a Fe recovery of 67.82% and sulfur content of 0.20%, copper concentrate grading at 23.40% with a Cu recovery of 64.06% and the additional sulfur concentrate grading at 23.05%.Then, a comprehensive recovery of iron, copper and sulfur is realized.The results show that oxalic acid for selective activation of pyrrhotite, and high collecting ability of new collector CYS on pyrrhotite are the key factors for realizing high efficient separation of magnetite and pyrrhotite.

Key words: Copper-bearing high sulfur magnetic iron ore, Inverse flotation of pyrrhotite, Oxalic acid, New-type collector CYS