Abstract: Pyrite cinder is a large amount of solid industrial waste. The iron content is high， and high lead and zinc content often restrict its utilization as an important factor of iron resources. The process of chlorination roasting-magnetization roasting-magnetic separation can successfully remove lead and zinc and obtain high grade iron and low lead zinc content iron concentrate. The kinetics of chlorination roasting of pyrite cinder with CaCl2 as chlorinating agent was studied in order to reveal the limiting link of chlorination reaction of lead and zinc in the main phases in the process of chlorination roasting of pyrite cinder， the rate of chlorination reaction and the mechanism of chlorination roasting. The results showed that: ① The contents of iron， lead and zinc were 49.90%， 0.29% and 1.23% respectively. The majority of zinc was zinc oxide， and lead was mainly lead oxide， followed by lead sulfate and other forms of lead. When the mass ratio of CaCl₂ to sulphuric acid residue was 6%， the chlorination time or roasting temperature is prolonged， and the chlorination volatilization rate of zinc and lead increased. When roasted at 1 000 ℃ for 5 min， the zinc and lead removal rates were 86.99% and 83.14% respectively， which created good conditions for subsequent magnetization roasting and magnetic separation to prepare high grade iron and low impurity iron concentrate. ② Comparatively speaking， it is easier to remove zinc by chlorination roasting than lead.③The apparent activation energy of zinc chlorination volatilization is 42.07×10³ J/mol at 900~1 050 ℃， which is controlled by chemical reaction； the apparent activation energy of lead chlorination volatilization is 43.88×10³ J/mol at 900~950 ℃， which is controlled by chemical reaction； and the apparent activation energy of lead chlorination volatilization is 20.34×10³ J/mol at 1 000~1 050 ℃， which is controlled by diffusion. ④To enhance the removal of chlorination volatilization of lead and zinc can be achieved not only by increasing the temperature， but also by increasing the amount of solid chlorinating agent or by increasing the porosity and specific surface area of solid particles of pyrite cinder.

Key words: Pyrite cinders, Lead, Zinc, Chlorination roasting, Kinetic.