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EFFECT OF FROTHER (MIBC) ADDITION ON THE CHARACTERISTICS OF MICROBUBBLES GENERATED BY AIR DISSOLVED NUCLEATION

An identification of the characteristics of microbbubles dispersion is presented in this paper, when frother addition (MIBC) is modified in a biphasic system (air-water). Sauter diameter (d 32 ), gas flow rate (Jg), superficial area flow density of the microbubbles (Sb) and air holdup (e g ) are the measured variables in this research work. The studied frother additions were 0, 10 and 20 ppm. Similar to conventional bubble sizes, it was observed also, that air holdup increases with the air flow rate. The linear relationship between e g and Sb permits to conclude that superficial area flow density, a variable difficult to measure directly, may be estimated if air gas holdup is known. Furthermore, the experimental results showed that frother addition (MIBC) reduced the Sauter diameter, increasing all other variables.