Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1993-02-16
1994-06-21
Lithgow, Thomas M.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
2102212, 2105121, 2105123, 2611221, B03D 124, B04C 510, B04C 5181, B04C 700
Patent
active
053221699
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flotation cyclone, more specifically a flotation cyclone for small particles of less than 30 .mu.m, as well as entities at the molecular level, such as molecules as such as well as ions.
Though various attempts have been made for separating particles by flotation, none of these have turned out to be satisfactory for efficient flotation of small particles of less than 30 .mu.m. The present invention provides a flotation cyclone, capable of efficient flotation of such particles as well as entities at the molecular level, such as molecules as such as well as ions.
The invention relates to a flotation cyclone comprising a cylinder, in its upper section provided with a porous wall, having a tangential inlet for a liquid with the particles to be separated, a weir at the lower end of the porous wall, and a gas chamber surrounding said porous wall. The cylinder has an extension beyond the porous wall downwards as a solid wall, provided at its lower end with water as a blocking device, which may be a bottom plate, whether or not adjustable, a cone, a float or similar.
The weir is the separation between the flotation section and the water/foam separating section of the apparatus. The water as a blocking device in said second section allows separation of foam from water. If a bottom plate is used, the cylinder will expand at its lower end to a larger width, causing water to act as a blocking device by appropriate positioning of the bottom plate.
The invention will now be elucidated with reference to the accompanying drawings without limiting the invention thereto. In the drawings:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a plan view of a flotation cyclone according to the invention, and
FIG. 2 shows a vertical cross-section of the flotation cyclone of FIG. 1.
In the drawings identical parts are referred to by identical reference numbers.
In FIG. 1 is shown a cylinder (1) with an inlet (2) for the material to be treated.
In FIG. 2 the cylinder (1) is shown with a tangential inlet (2), a gas inlet (3'), a porous wall (4), a baffle plate or weir (5), an extension with a solid wall (6), an expansion (7) and a bottom plate (8) with a liquid outlet (9) and a vortex-finder (10).
A liquid, optionally containing a surfactant, or a surfactant, if desired, may be added elsewhere, and having suspended therein small particles (of less than 30 .mu.m), is introduced through a tangential inlet (2) into a cylinder (1).
The cylinder (1) comprises a porous wall (4), which is surrounded by a gas-chamber (3) with an inlet (3') extending around said porous wall (4). At the bottom of the cylinder (1) is weir (5). The liquid in tangentially injected into the cylinder (1) with the porous wall (4), thus causing rotation. If desired a plurality of tangential inlets may be used. By means of the weir (5), which usually is of an annular shape, a properly controlled rotating liquid film is obtained. The angle of the weir (5) with the wall of the cylinder (1) can be a right angle, but may deviate therefrom. Through the gas-chamber (3) with the inlet (3') a gas, inert with respect to the liquid, its contents and the apparatus, is introduced through the porous wall (4), thus providing a controlled injection of gas into the film. Preferably the gas pressure and the pores in the porous wall (4) are selected such that the gas bubbles formed are in the order of 0.05-1 mm in size. If desired the gas chamber (3) may be subdivided into segments, especially if the friction of the liquid on the wall would cause a rotational velocity gradient in the axial direction.
The liquid passing the weir (5) flows into an area (11) of an extension (6) of cylinder (1), said extension (6) having a solid wall. The cylinder is first provided with an outlet member in the form of expansion housing (7), thus allowing separation of the liquid from the foam. This latter section is the liquid/foam separating section. The area (11) is provided with an adjustable bottom plate (8), thus allowing liquid to act as a blocking device. The liquid, compr
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Heidemij Reststoffendiensten B.V.
Lithgow Thomas M.
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