A Kinetic Model for Pb2+ Flotation with Sodium Dodecylsulfate in a Batch Column

• Published in: Separation science and technology 2005-11, Vol.40 (15), p.3225-3237
• Main Authors: Uribe-Salas, A., Pérez-Garibay, R., Nava-Alonso, F., Castro-Román, M.
• Format: Article
• Language: English
• Subjects: batch column; Flotation; kinetic model; sodium dodecylsulfate
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1080/01496390500385426

The flotation kinetics of Pb 2+ 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 1×10 −4  M Pb 2+ 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 6.1×10 −5 to 12.2×10 −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.