Froth Flotation*

Froth flotation is a continuous separation process where solids in liquid suspension are removed through their preferential attachment to air bubbles. During normal operation, the bubbles mix with solid/liquid mixture at the base of a column (flotation cell) and rise through the liquid with the required solids preferentially attached to their surfaces; gangue, the unwanted material, is discarded. Toward the top of the column both the bubbles, which usually form a foam or froth, and their solids load are mechanically removed, for instance by skimming.

*This definition was reprinted by permission from the "Dictionary of Filtration and Separation". The "Dictionary" contains over 1500 definitions and 400 diagrams and photos. More information on the "Dictionary" and order form can be found here.

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