| 摘要 |
<p>A froth wash and froth removal unit (10) for flotation apparatus comprises a froth removal apparatus (12) and a froth wash apparatus (14). The froth removal apparatus (12) comprises a plurality of elongate members in the form of troughs (16) adapted to extend across a froth zone of a flotation apparatus and arranged side by side, with the side walls of adjacent troughs defining gaps (18) between adjacent troughs. The troughs (16) are arranged radially from a central hub (20) to a circumferential rim (22). The troughs (16) are open at the rim (22) and closed at the hub (20), and the bottoms of the troughs (16) are inclined downwardly in a radially outwards direction so that froth passing upwards through the gaps (18) flows over the side walls of the troughs (16) and outwards towards the rim of the froth removal apparatus (12). Each trough (16) comprises a pair of side walls (24) which converge towards a lower edge (25) at the bottom of the trough whereby froth passing upwards through the gaps (18) is accelerated by the converging side walls of adjacent troughs. The converging side walls (24) of the troughs (16) cause a crowding effect so that the velocity of the froth flowing upwards through the gaps (18) is increased. The increased velocity helps to ensure free flow of froth over the side walls of the troughs (16) for collection. A significant advantage of the design of the troughs (16) is the increased froth removal lip-length that can be achieved.</p> |
