1. Introduction
Froth flotation is used extensively in coal and mineral processing
to recover and concentrate valuable fine particles. The valuable
particles are made hydrophobic through the application of a
collector, and their attachment and adhesion promoted using a
high shear rate to effect both a collision, and then final adhesion
with air bubbles. A frother is introduced to stabilize the air–water
interface. The bubbles then rise up through the device to form a
froth zone, allowing liquid drainage, releasing hydrophilic particles
and some hydrophobic particles from the final froth product
(Neethling and Cilliers, 2002). Additional water applied as drops
at a sufficient rate from above the free-surface of the froth delivers
a downwards positive bias flux, improving the product grade.
1. IntroductionFroth flotation is used extensively in coal and mineral processingto recover and concentrate valuable fine particles. The valuableparticles are made hydrophobic through the application of acollector, and their attachment and adhesion promoted using ahigh shear rate to effect both a collision, and then final adhesionwith air bubbles. A frother is introduced to stabilize the air–waterinterface. The bubbles then rise up through the device to form afroth zone, allowing liquid drainage, releasing hydrophilic particlesand some hydrophobic particles from the final froth product(Neethling and Cilliers, 2002). Additional water applied as dropsat a sufficient rate from above the free-surface of the froth deliversa downwards positive bias flux, improving the product grade.
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