Froth liquid transport in a two-dimensional flotation cell

Longer distances to the overflow discharge lip promote higher water drainage from the froth to the collection zone. For the liquid content near the top of the froth, the liquid drainage increased gradually from almost nil to approximately 50% when the distance to the lip level was increased from 5 to 98 cm. In contrast, the liquid content in the froth near the interface was almost fully drained for distances larger than 15 cm from the discharge lip. This information was complemented by froth surface velocity measurements using the Visiofroth system and showed a good agreement with the liquid transport velocity measured near the discharge lip wall. The increase in the frothcrowder angle (40-50°) also showed a significant effect on the froth liquid transport velocity and similar drainage characteristics.