Abstract
Individual bubbles ca. 2.3mm in diameter were produced at a capillary in water containing an inorganic salt (NaClO4, KCl, NaCl, Na2SO4, or CaCl2). Using high speed photography and image analysis techniques, bubble aspect ratio and rise velocity were measured at 1ms time intervals over a distance ca. 1.15–1.20m above the capillary. All conditions showed oscillations in bubble aspect ratio and velocity that were related. Increasing concentration, on average, created more spherical bubbles that rose at lower velocities. The same observations were made in the presence of MIBC frother. Results suggest a unique relationship between bubble shape and rise velocity independent of solute type. The effect of inorganic salts on bubble behavior and gas dispersion in flotation systems is discussed.
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