Method and apparatus for separation by flotation

Details Method and apparatus for separation by flotation Method and apparatus for separation by flotation

B - Operations, Transporting

03

D

B03D 1/02 (2006.01) B03D 1/14 (2006.01) B03D 1/24 (2006.01) C02F 1/24 (2006.01) D21B 1/32 (2006.01) D21F 1/70 (2006.01)

Patent

CA 2155198

A suitably conditioned slurry feed is introduced to a trough (1) from which it is distributed into a slurry layer-flow forming chamber (2). Chamber (2) is provided with a discharge weir (3) which discharges an evenly spread layer of slurry (4) onto an inclined plate (5) feeding into a mixing passage (6). Recirculated slurry from vessel (7) is also fed into mixing passage (6) via a recycle gate (8) which forms it into a layer of slurry (9). An array of clean liquid jets (12) accelerates thin gas envelopes and impinges between layers of slurry (4) and (9) causing intensive mixing of all streams in mixing passage (6). The high shear rate produces high intensity turbulence and shears gas into very small bubbles. A multiphase mixture flow is discharged from mixing passage (6) into vessel (7), where it flows past one or more longitudinal stabilizing baffles (13). Gas bubbles loaded with hydrophobic particles disengage from the stream, rise towards the liquid surface and are diverted by bubble diverting guides (14) towards the froth discharge end of the vessel. A layer of froth travels towards froth weir (15) where it is discharged. The residual slurry leaves discharge launder (19) via a weir (20) to the next flotation cell or process stage.

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