| 摘要 |
A fluid jet flotation apparatus 1 is disclosed. The apparatus 1 comprises a tank 10 containing a liquid having a relatively lower region and a relatively upper region and a conduit 2 having a liquid inlet 5 through which a particle-containing liquid is introduced to the conduit 2 as a jet. The conduit 2 also includes a gas inlet 6 through which gas is drawn into the conduit 2 by the jet, the liquid and the gas forming a foam bed that is displaced through the conduit 2 and out through an outlet 24 remote from the inlet 5. The outlet 24 is positioned to discharge the foam bed from the conduit 2 into the tank 10 in an upward direction and in a relatively upper region of the tank. This enhances the separation of value particles in the froth from waste particles in the body of liquid. Further, the reduced pressure at the outlet 24 of the conduit 2 enhances the draw and thereby the volumetric throughput through the conduit 2. In the drawing the conduit comprises a downcomer and then a riser extending up from the downcomer. The apparatus also includes a froth recovery means for recovering particle laden froth from a froth layer that forms above the liquid in the tank 10. The tank 10 has a peripheral wall 11 with an upper edge defining a top that opens to the atmosphere and the froth recovery means comprises an overflow weir 15 formed by said upper edge of the tank 10 over which the froth layer can be discharged from the tank 10.
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