Overview of the Essential Elements of Separations Based on Froth Flotation

The objective of a flotation separation operation is to remove small hydrophobic particles from an aqueous suspension (pulp) by causing them to collide with, and to attach to, air bubbles. The bubble-particle aggregates rise through the suspension forming a froth at the upper surface of the pulp. The froth, which consists of the bubble-particle aggregates with inter-bubble water containing both hydrophobic and hydrophilic particles, forms a second phase where further enhancement of the hydrophobic/hydrophilic particle separation occurs, by water draining back to the pulp. The final product in which the hydrophobic particles are concentrated is removed as a froth overflow.

The science of the separation is primarily concerned with improving the selectivity of the hydro-phobic particle attachment in the pulp through the addition of surface active chemicals. In addition, the hydrodynamics of the bubble-particle collision in the aerated suspension is important, as is the regulation of the drainage of water-containing hydrophilic particles from the froth by controlling its structure, also with surfactants.

It is probably fair to say that the industrial practice of flotation is effective even in the absence of a complete understanding of its scientific basis. The successful application of flotation separations in industry can be classified into three areas.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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