Abstract: Taking Xinjing a siderite as investigated object the effects of various factors to magnetie separation, such as roasting temperature, duration, mass ratio of coal to ore, grinding fineness of roasted ore and magnetic field intensity were investigated.It is shown that the magnetic concentrate，assaying 63.55%iron at 95.76%iron recovery, was produced under such conditions as roasting 16~10 mm siderite at 800 ℃ for 15 min within MUFFLE furnace in air atmosphere , and magnetic separation of the roasted ores with grinding fineness of 90% passing 0.074 mm and at 151.20 kA/m field intensity.

Key words: Siderite, Magnetizing roasting, Magnetic separation