Abstract: In this paper, the dynamic sorption of sulfuric acid mist from leadacid battery plants by red mud was studied. The effect of sintering temperature, sintering time and sorbent porosity of red mud on H_2SO_4 mist removal efficiency was investigated. It was found that the sintered sorbents exhibit higher removal capacity for sulfuric acid mist when compared with that of raw red mud. The removal efficiency of sulfuric acid mist can be higher than 95% with the sintering temperature of 750 ℃, sintering time of 5 h and sorbent porosity of 26%. The physical and chemical properties of sorbents were characterized through scanning electron microscopy and Xray diffraction analyses.