Abstract:The volatilization kinetics of antimomy with reaction between Pb-Sb complex sulfide ores and air-steam mixture was investigated by measuring volatilization ratio of antimony. The results of scanning electron microscope(SEM) showed that there was a clear reaction interface in the Pb-Sb complex sulfide ores particle . The experimental data were fitted to a mathematical model of joint controlled by the chemical reaction at the interface and diffusion of steam through the product layer. The apparent energy for the chemical reaction and diffusion were calculated to be 117.08 kJ/mol and 56.73kJ/mol respectively. The experimental results showed that the volatilization ratio increases with the increasing of the reaction temperature, steam flow rate and decreasing of bed thickness.