Abstract: The main useful mineral in a finely-disseminated magnetic iron ore is magnetite and it has a extremely fine particle size.Tests were made on two process flowsheets that were raw ore size screening-dry type magnetic separation-wet type coarse size magnetic separation-three stages grinding-low intensity magnetic separation (Flowsheet 1) and raw ore size screening-dry type magnetic separation-wet type coarse size magnetic separation-two stages grinding separation-magnetic separation-fine screening separation-magnetic separate column for undersize-middlings regrinding-magnetic separation (Flowsheet 2) to provide a technical basis for economically and high-efficiently utilizing this ore.A concentrate at a yield of 20.20% and iron grade of 65.48%(magnetic iron grade of 64.78%) and iron recovery rate of 58.15%(magnetic iron recovery rate of 94.72%) can be obtained by adopting the recommended Flowsheet 2 at the final grinding size of -0.043 mm 80%.

Key words: Finely-disseminated magnetic iron ore, Preconcentration by magnetic separation, Sage grinding, magnetic and gravity separation