Abstract: The effect of roasting system on lead and zinc evaporation rate，iron metallization rate of cold bond pellets made of coal slime-zinc leaching residue was investigated based on direct reduction.The influence of roasting system on phase change of Zn，Pb and Fe compounds in the pellets was analyzed.The process of grinding-low intensity magnetic separation for iron recovering is determined according experiments.Results show that calcined at 1 250 ℃for 90 min，the evaporation rate of lead 95.39% and zinc 98.87%，iron metallization rate of 98.66% were obtained.In the roasting products，diffraction peak of Zn，Pb monomer metals and its compounds disappeared，while more iron emerged，and majority of which are greater than 30 μm in particle size.Metallic iron powder with iron grade of 91.20% and recovery of 30.32%，and iron concentrate with iron grade of 61.58% and recovery of 50.01% were obtained through two stage grinding，two stage low intensity magnetic separation process，and the total iron recovery reaches 80.33%.

Key words: Coal slime, Zinc leaching residue, Cold bonded pellets, Direct reduction, Roasting system