关键词: 菱铁矿, 煤基直接还原, 弱磁选

Abstract: Using a siderite ore as raw material， experimental study on direct reduction and low intensity magnetic separation process was carried out. The effects of roasting temperature， reduction time and carbon-iron mass ratio on the metallization rate of reduction roasted products were studied. And the effects of grinding fineness and magnetic field intensity on the indexes of low intensity magnetic separation were studied. The results show that the reduced product assaying 90.88% metallization rate was obtained under the conditions of reduction roasting temperature at 1 050 ℃ for 100 min and mass ratio of carbon-iron in 2.3. And the magnetic concentrate， assaying 92.40% iron and 96.60% iron recovery， were produced under the conditions of grinding size -0.037 mm account for 79.60%， magnetic field intensity of 79.62 kA/m. The magnetic concentrate can be used as raw material for steelmaking.

Key words: Siderite, Coal based direct reduction, Low intensity magnetic separation