Abstract
The properties and thickness of the bubbles in the froth control the flotation process. There is no work showing how to measure bubble film composition and thickness by a straightforward manner. In this work, a novel approach, a custom-designed bubble cell associated with layer interferometry (in the UV-vis region) and FT-IR spectroscopy was used to investigate the effect of solid particle type (hydrophilic vs hydrophobic), concentration and bubble diameter on stability of a bubble blown in air. Stability was quantified by measuring bubble lifetime and hydrated film thickness. Kerosene with silicone oil as a foaming agent was used to evaluate the impact of bubble diameter (test series I). Frother solutions (MIBC, Dowfroth 250, Hexanol and F-150) were used for the solid type concentration experiments (test series II). In the first series of experiments, it was determined that as the diameter of a bubble increased from 10 to 25 mm, so did the hydrated film thickness from 350 to 1000 nm. In the second series, as the silica concentration increased (0 to 10%), an increase in bubble lifetime and hydrated film thickness was resulted (130%–250%). An impact of solid hydrophobicity was found but to a lesser degree than expected. It is possible that the small particle size (<0.1 m) of silica was responsible for this behavior. The findings are used to interpret the effect of solids in flotation froth.
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Foundation item: Project(2013BAB14B05) supported by National Key Technology Research and Development Program of the Ministry of Science and Technology of China
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Liu, HJ., Zhang, W. & Sun, CB. Influence of bubble diameter and solids concentration on bubble stability: Development of a novel analytical approach. J. Cent. South Univ. 21, 3588–3595 (2014). https://doi.org/10.1007/s11771-014-2340-6
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DOI: https://doi.org/10.1007/s11771-014-2340-6