Abstract: Basedon a low grade complex refractory iron ore, researched the effect indexes and mechanism of pelletizing-direct reduction-grinding and separation technology.Raw ore crashed to less than 4 mm was mixed with 0.5% of organic binder, 10% of water and 20% of reductant coal named M3 for pelletizing under the pressure of 190 kN and then got the pellets of  φ30 mm×20 mm. The pellets were reduced at 1 200 ℃ for 40 min and then the roasting pellet was ground to the size -43 μm 85%, magnetic separation at 88 kA/m under two stage separation. The direct reduction iron with 91.44% iron grade and 90.85% recovery was obtained under this condition. The DRI can be used as superior burden for making steel.

Key words: Refractory iron ore, Pelletizing, Direct reduction, Magnetic separation