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Oscillatory air supply has demonstrated advantages over conventional steady air supply in froth flotation with diffused aeration, but the interaction between oscillatory air supply and frother in determining bubble size remained unclear. In the present work, we measured the size of air bubbles in a laboratory scale flotation column with common frothers such as MIBC, Dowfroth 250, and polypropylene glycol with an average molecular weight of 425 (PPG 425), with conventional steady air supply and with oscillatory air supply. The oscillatory air supply was converted from steady airflow using a fast-switching solenoid valve with the main operating parameters being switching frequency and on/off time ratio. In the absence of frother, the Sauter mean bubble diameter ( d32 ) remained the same with oscillatory air supply replacing steady air supply, but the  d32  decreased by 13–35% in the presence of frother. It was also found that the critical coalescence concentration ( CCC ) of each frother were reduced by 11–69% using oscillatory air supply to replace steady air supply. The degree of reduction in  d32  or the  CCC  appeared to be dependent on the oscillatory airflow condition (i.e., frequency and on/off time ratio) and frother type. The present work also confirms the recent findings by others that the  CCC  is not solely a material property of frothers.

Bubble Size in a Flotation Column with Oscillatory Air Supply in the Presence of Frothers