Abstract: The Cd and Pb volatilization behavior in model solid waste in a fluidized bed incinerator with Al₂O₃ bed material was investigated. The influence of redox conditions, H₂O, HCl, SO₂ and Al₂O₃ was examined. The results show that Cd has a great volatility, especially when HCl is added, while Pb volatilizes moderately. Increasing the oxygen concentration can lower the heavy metal volatilization. The sorption (either physical or chemical) of Al₂O₃ particles, coupling with the internal diffusion of gaseous metal species, may control the volatilization of heavy metals. When SO₂ is added, Cd and Pb show a higher volatility.