Abstract
Flotation froths are three-phase systems with solids in the froth. In addition to the characteristics of a solid (e.g., particle size and hydrophobicity), the frother properties play a dominant role in imparting stability to the froth (El-Shall et al., 2000). It is believed that the frother concentration strongly influences air-dispersion characteristics (i.e., bubble size, air holdup and air/liquid interfacial area) in the column and thus flotation performance.