Abstract
The effect of air rate, frother concentration and pulp density on the behaviour of the pulp and froth phases in a laboratory column flotation cell has been studied. Decreasing air rate and increasing frother concentration reduce entrainment and produce small bubbles and greater plug flow behaviour in the pulp. Small bubbles produce a stable froth and higher grades. Recoveries are not strongly dependent on these parameters except in the case of very low frother concentrations which result in unstable froths. The absence of solids in the froth overrides the influence which reducing pulp density has on bubble size and mixing characteristics.
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