Abstract
The kinetics of removal of heavy metal hydroxides from their aqueous suspensions by dissolved-air flotation, both in the presence and absence of sodium oleate as a collector was studied. The systems considered were the hydroxides of copper and zinc, taken separately, and a mixture of hydroxides of copper, zinc, nickel, iron and chromium.
The results showed that the kinetics of precipitate flotation of metal hydroxides by dissolved-air techniques may be described by an empirical equation of the form R= a · t b, with the corresponding coefficients of determination in the range 0.70–0.98.
The metal recoveries were in the range 69–97%, and the flotation time was very short: 120 s. Addition of sodium oleate had a positive effect on the efficiency of metal hydroxide removal. This was confirmed by the higher values of the empirical kinetic coefficient a in the equation describing the flotation kinetics. In the range of pH 7–10, the hydrophobic nature of the surface of metal hydroxide particles was the main factor governing the kinetics of the flotation process.
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© 1991 Springer Science+Business Media New York
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Karlović, E., Mišković, D. (1991). Kinetics of the Removal of Heavy Metal Hydroxides by Dissolved-Air Flotation in the Presence of Sodium Oleate as a Collector. In: Pawlowski, L., Lacy, W.J., Dlugosz, J.J. (eds) Chemistry for the Protection of the Environment. Environmental Science Research, vol 42. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3282-8_42
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DOI: https://doi.org/10.1007/978-1-4615-3282-8_42
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