Hua Han, An Liu, Cai-li Wang, Run-quan Yang, Shuai Li, and Huai-fa Wang, Flotation kinetics performance of different coal size fractions with nanobubbles, Int. J. Miner. Metall. Mater. https://doi.org/10.1007/s12613-021-2280-8
Cite this article as:
Hua Han, An Liu, Cai-li Wang, Run-quan Yang, Shuai Li, and Huai-fa Wang, Flotation kinetics performance of different coal size fractions with nanobubbles, Int. J. Miner. Metall. Mater. https://doi.org/10.1007/s12613-021-2280-8
Research Article

Flotation kinetics performance of different coal size fractions with nanobubbles

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  • Received: 13 November 2020Revised: 17 February 2021Accepted: 5 March 2021Available online: 6 March 2021
  • The flotation kinetics of different size fractions of conventional and nanobubbles (NBs) flotation were compared to investigate the effect of NBs on flotation performance of various coal particle size. Six flotation kinetics models were selected to fit the flotation data and NBs were observed on the hydrophobic surface under hydrodynamic cavitation by atomic force microscope (AFM) scanning. The flotation results indicate that the best flotation performance of size fraction at -0.125+0.074 mm can be obtained either in conventional or NBs flotation, NBs increase the combustible recovery of almost all of the size fractions, but increase the product ash content of -0.25-0.074 mm and reduce the product ash content of -0.045 mm at the same time. The first-order models can both be used to fit the flotation data in conventional and NBs flotation, the classical first-order model is the most suitable one. NBs have an obvious enhancement of flotation rate on coarse size fraction (-0.5+0.25 mm) but decrease the flotation rate of the medium size (-0.25+0.074 mm), the improvement of flotation speed on fine coal particles (-0.074 mm) is probably the reason of the better flotation performance of raw sample flotation.
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