The flotation kinetics of Pb2+ ion with sodium dodecylsulfate (SDS) was studied with the aim of validating a model developed based on the considerations presented by Nicol et al. 1. The study was conducted under experimental conditions similar to those used by Liu and Doyle 2, namely, 1 L of solution at pH=4 containing 1x10(-4) M Pb2+ and 0.4% v/v ethanol as frother; the metal:collector molar ratio was varied from 1:1 to 1:4. The experiments were performed in a 0.057 m diameter column using an air flow rate in the range of 6.1x10(-5) to 12.2x10(-5) m(3) /min. Results show the kinetics of the flotation is first order with respect to collector concentration (SDS), with a rate constant directly depending on the bubble surface area rate (A(b) , m(2) /min), the slope of the adsorption isotherm of the surfactant onto the bubble-liquid interface (a), and cross-sectional area of the flotation cell (A), and inversely depending on the volume of the (well-mixed) lead-bearing solution.