The bubble properties in the column flotation system are deeply affected by the bubble-generator type, frother dosage, and superficial gas velocity. This study is to determine the bubble-generator type, which effectively produces micro-bubbles to affect the flotation efficiency. Characteristics for two types of bubble generators like the in-line mixer and sparger are examined by bubble properties such as bubble diameter, holdup and bubble velocity. Micro bubbles generated from an in-line mixer result in the increase of the bubble rising velocity and gas holdup. Bubbles produced at the in-line mixer were more effective for operating the flotation system than that of the sparger.
It means that the in-line mixer bubble generator is more effective than a sparger in designing or operating the column flotation system.
Lee JE, "Separation Characteristics of Fly Ash through the Analysis of Bubble Behavior in Counter Current Column Flotation," Ph.D. Dissertation, Power Technology, Pusan National University, Pusan, Korea, 1999