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The effect of chemical flotation reagents on the zeta potential (ζ) of particles is well known, but their effect on bubbles is practically unknown. This study characterizes the ζ of air bubbles conditioned with typical froth flotation reagents and presents a novel experimental setup and method for estimating the electrophoretic velocity. It was observed that collectors strongly affect ζ in the following order from more to less anionic: xanthate, dithiophosphinate, deionized water, mercaptobenzothiazole and dodecylamine. By contrast, frothers affect ζ only slightly. In this study, it was also observed that pH affects the microbubble diameter and that under acidic or basic conditions, the bubble diameter decreases. |
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