The aim of this research was to evaluate the efficiency of a cyclonic scrubber in a simultaneous removal of suspended particles and SO2 from the warm airflow in factories extracting lead. At first, the sampling from the suspended particles and SO2 gases exhausted from the chimneys was carried out before applying the filtration system. Then, the cyclone scrubber system was designed based on the pressure, velocity and concentration of SO2 gas and suspended particles. Limewater (60 g/l) was used as the absorbent in the scrubber, and the removal percentage of these pollutants was calculated. The results showed that the removal efficiency of these suspended particles (average diameter of 20 µm) with low and high load (performance of factory) was 87.6% and 86.7%, respectively, and the removal efficiency of SO2 gas was 78.5% and 85.7%, respectively. Moreover, the evaluation of time variable in the removal of these pollutants showed that the removal efficiency decreased with time and with the increase of pollutant concentration; and this event can be related to decreasing limewater purity. Finally, the effect of alteration in limewater and activation of nozzles on the removal percentage of the gas and particles was evaluated. Results showed that the activation of 11 nozzles caused to remove 82.9% of SO2 gas and 85.4% of suspended particles. Generally, this study demonstrated high quality of removing SO2 and suspended particles by the cyclone scrubber system in the warm airflow

Keywords: Cyclone scrubber; SO2; Suspended particles; Lead extraction; Warm airflow.