Abstract: For the properties of Tiekeng Limonite Ore, ball-pressure pelletization-magnetization roasting-low intensity magnetic separation was used to improve the iron concentrate grade.Investigated the influence of balling conditions to pellet strength, magnetization roasting conditions and grinding fineness to iron concentrate.The results show that, under the conditons of the mass ratio of inner coal, water and bending agnet CMC to raw ore each for 20%, 10% and 0.5%, the pressure 190 kN, ball-pressure pelletization can make the pellet strength achieve to demand.Under the condition of the mass ratio of outer coal to raw ore for 15%, roasting temperature 900 ℃, roasting time 50 min, magnetization roast the pellet, after grinding the roasting ores to the size 85% -0.074 mm, carried out once roughing once cleaning magnetic separation under the magnetic field intensity each as 159.2 kA/m, 119.4 kA/m, iron concentrate with iron grade of 63.55%, iron recovery of 83.54% and SiO₂ grade of 6.38% was obtained.

Key words: Limonite ore, Ball-pressure pelletization, Magnetization roasting, Low intensity magnetic separation