Mass transfer studies are carried out in a bubble column with an internal diameter of 14 cm and various static liquid heights. The mass transfer coefficient is evaluated by using an oxygen sorption method. A model considering the gas holdup flushing and the sensor response is used. The interfacial mass transfer area is determined according to the measured bubble size distribution. The liquid-si...

This paper addresses the influence of hydrostatic pressure (Phyd) on bubble diameter (db) and contact angle (θ) quartz in pure water versus collector solution (Flotigam® EDA, γLG = 57 mN/m) at 20 °C. The range (0–300 kPa) applied against bubbles’ walls mimics what may happen along vertical axis a hypothetical flotation column (HFC) that processes iron ore slurry via cationic reverse quartz. Fro...

We have studied bubble motion within a column of foam allowed to undergo free drainage. We have measured bubble motion upward with time and as a function of their initial positions. Depending on the gas used, which sets the coarsening and drainage rates, different bubble upward motion types have been identified (constant speed, acceleration or deceleration) and explained in relation with liquid...