Agitating – Having interrelated feed and discharge means – Recirculating from and to mixing chamber
Patent
1998-03-04
2000-02-01
Soohoo, Tony G.
Agitating
Having interrelated feed and discharge means
Recirculating from and to mixing chamber
3661652, B01F 1502, B01F 508
Patent
active
060194979
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The invention pertains to the field of process technology and relates to an apparatus and method for mixing a gas with a liquid. The invention can be used, for example, in ore dressing, in dissolving processes, and in the aeration of water.
BACKGROUND
For the mixing of a gas with a liquid there are used, for example, perforated nozzles through the perforations of which the gas is directed under pressure into the liquid.
FIG. 5 in publication GB-1115288 also shows a mixing apparatus in which a liquid and a gas are fed tangentially into a space between two cylindrical surfaces, the liquid into the upper section and the gas into a lower point, under an annular skirt. The mixture is withdrawn upwards via a connection in the center. In this apparatus, the cross-sectional area of the opening which leads out of the annular mixing space is greater than the area of the feed connections.
DESCRIPTION OF THE INVENTION
GENERAL DESCRIPTION
A mixing apparatus according to claim 1 has now been invented. Certain preferred embodiments of the invention are stated in the other claims.
The most essential idea of the invention is that the liquid and the gas to be mixed with it are fed tangentially into the space between two surfaces of revolution so that the mixture comes into a rotary motion in the space, and that the mixture leaves the mixing space via a nozzle opening when a cross-section of area smaller than the cross-sectional area of the feed connections. During the rotary motion, the gas, in the form of small bubbles, will mix with the liquid, and dissolve in the liquid. Preferably the pressure in the mixing space is higher before nozzle opening after, so that after mixing the liquid will be supersaturated. In this case, dissolved gas will separate from the solution and micro-sized gas bubbles will form.
The nozzle opening is preferably at one end of the mixing space.
In one embodiment of the invention, a plurality of feed connections is contemplated. These connections may be placed at desired locations either on the outer or on the inner periphery of the mixing space.
The shape of the reactor may vary, which can be determined according to the use and the application.
The invention can be used, for example, in froth flotation of ores for the formation of bubbles, and in the maintenance of a slurry suspension. The invention is also highly applicable also to the aeration of waste water tanks and watercourses. Various dissolving processes requiring the addition of a gas are also typical areas of use for the invention.
DESCRIPTION OF THE DRAWINGS
In the drawings of the specification,
FIG. 1 shows a top view of a gas-mixing reactor according to the invention, and
FIG. 2 shows a side view of the same apparatus, through section A--A, and
FIG. 3 shows a froth flotation apparatus in which mixing according to the invention is used.
DETAILED DESCRIPTION OF CERTAIN EMBODIMENTS
The reactor shown in FIGS. 1 and 2 has a cylindrical outer mantle 1 and, inside it parallelly, a narrower inner mantle 2; which is attached to the closed upper end 3 of the reactor but detached from the reactor bottom 4. Between the mantles is an annular chamber 5. There is an opening 6 in the center of the reactor bottom.
The inner mantle 2 has here a narrower cylindrical upper section and a broader cylindrical lower section linked thereto via a conical intermediate section. Thus the cross-sectional area of the upper section of the reactor is greater.
At the upper end of the annular chamber 5 the outer mantle 1 has a feed inlet 7 with a tangential feed pipe 8. A liquid material and a gas are fed under pressure via the feed pipe into the annular chamber in such a manner that they come into a rotary motion in the annular chamber. Gas is incorporated and dissolved into the liquid as bubbles. Any gas not mixed with the liquid separates as a ring on the surface of the inner mantle. From this, gas becomes further mixed into the liquid.
At the bottom 4 of the reactor, in its corner, there is an annular limiting ring 9 in such a ma
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Hintikka VainoViljo Heikki
Ingerttila Kauko Tapio
Klemetti Veli Markku
Knuutinen Veli Tapio
Morsky Pekka Parttyli
Soohoo Tony G.
Valtion teknillinen tutkimuskeskus
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