EP0622122B1 - Flotation cell with an injector - Google Patents

Flotation cell with an injector Download PDF

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Publication number
EP0622122B1
EP0622122B1 EP94103560A EP94103560A EP0622122B1 EP 0622122 B1 EP0622122 B1 EP 0622122B1 EP 94103560 A EP94103560 A EP 94103560A EP 94103560 A EP94103560 A EP 94103560A EP 0622122 B1 EP0622122 B1 EP 0622122B1
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EP
European Patent Office
Prior art keywords
pipe
screen
flotation cell
diameter
holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94103560A
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German (de)
French (fr)
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EP0622122A1 (en
Inventor
Gerhard Veh
Peter Schweiss
Hans-Dieter Dörflinger
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JM Voith GmbH
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JM Voith GmbH
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Publication of EP0622122A1 publication Critical patent/EP0622122A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23121—Diffusers having injection means, e.g. nozzles with circumferential outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/2366—Parts; Accessories
    • B01F23/2368—Mixing receptacles, e.g. tanks, vessels or reactors, being completely closed, e.g. hermetically closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/305—Injector mixers the additional component being axially fed and radially discharged through a circumferential outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4323—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa using elements provided with a plurality of channels or using a plurality of tubes which can either be placed between common spaces or collectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4521—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through orifices in elements, e.g. flat plates or cylinders, which obstruct the whole diameter of the tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1481—Flotation machines with a plurality of parallel plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/75—Flowing liquid aspirates gas

Definitions

  • the invention relates to a flotation cell with at least one injector according to the preamble of claim 1.
  • a flotation cell is known from the publication "5 years of operating experience with pneumatic flotation in hard coal processing" by A. Bahr, K. Legner, H. Lüdke, FW Mehrhoff in Aufleungstechnik, 28 (1987) pp. 1 - 9.
  • the cell disclosed in this document is characterized by a sectioned tubular body, with the suspension from a central tube entering each individual section with the aid of a funnel-shaped opening, resulting in a laminar suspension flow results.
  • Another such cell is disclosed in EP-A-0277327.
  • the diaphragm is located within a feed tube of the flotation cell for the suspension, specifically at the beginning of a mixing tube section of this feed line. Shortly after the orifice - that is to say downstream - air supply slots are provided in the mixing tube section, and distributed over its circumference. In this case, practically only one arrangement makes sense in which the openings (holes) of the diaphragm are close to the circumference of the same. This is not a very effective arrangement. Attempts have also been made to increase the small throughput of the orifice described by an arrangement with a multiple injector according to DE-A-36 34 903. Here too, the way of working is accompanied by insufficient effectiveness due to the distribution among the different injectors - each of which is designed with its own mixing tube.
  • the object of the invention is to provide a flotation device with an injector which works at very high throughput quantities, ie air bubbles are distributed in the suspension in a sufficiently large quantity.
  • Each hole of the diaphragm is preferably assigned its own premix tube section in order to achieve the best possible air intake. This high amount of air should be mixed well with the suspension due to high turbulence in the premixing tube.
  • FIG. 1 shows in principle a cross section through a flotation cell with the injector according to the invention
  • FIG. 3 shows a top view of this and in particular the diaphragm
  • FIG. 4 shows another diaphragm arrangement.
  • the flotation cell according to FIG. 1 has a housing 20 which is essentially oval in cross section and into which it is eccentric - that is to say in the vicinity of a narrow side the same - an injector 1 is inserted, which ends about 50 - 100 cm below the suspension level.
  • This level is set by means of a weir 22 which can be adjusted by means of the adjusting rod 25 and over the overflow edge of which the foam containing dirt flows out into the foam channel 21 together with a certain proportion of the suspension.
  • the suspension is preferably gassed with air.
  • the vertical feed tube 6 of the injector has an orifice 2 which is provided with through openings in the form of round holes 3 which are distributed uniformly over the circumference of the orifice (see FIG. 3).
  • each hole 3 is followed by a pipe section 7 of small diameter, which serves as a premixing section.
  • the distance between the diaphragm and the pipe section 7 preferably has a value between 0.15 times and 1.5 times the hole diameter.
  • the length of the small pipe sections 7 is preferably 4 to 10 times their inner diameter or at least 0.8 times the inner diameter of the mixing pipe section 6 'connected downstream of the orifice, which in turn has approximately the same diameter as the outer diameter of the orifice 2.
  • the injector preferably has a continuous tube as the outer wall. However, at its end there is a radial diffuser 4 with a base plate 5, which leaves a gap 15 with respect to the tube 6 ', which is approximately 7-14% of the diameter of the mixing tube 6'.
  • the average flow velocity to the orifice can be set at about 2 m / s, so that due to the geometric conditions shown, a flow velocity behind the orifice holes of 12.5 m / s and after the premixing tubes 7 of about 4.5 m / s s results.
  • the outflow speed from the radial diffuser 4 is then about 2.2 m / s. But this is just an example.
  • the air is sucked in through the pipe sections 7, which act as small injectors, in a pipe section 9 of the supply line, which is connected downstream of the diaphragm. This has at least one air connection.
  • a valve can be switched on here to control the amount of air sucked in. It is favorable if the pipe sections 7 protrude at least 10 mm from the air intake section 9.
  • the aperture holes do not need to be exactly circular, as does the cross section of the pipe sections 7, e.g. a relatively even polygon or an ellipse is possible.
  • the inside diameter of the small pipe sections should be at least 10% larger than the diameter of the holes in the panel.
  • FIG. 4 shows that a different, approximately uniform distribution of the holes in the diaphragm can also be provided as in FIGS. 2 and 3.
  • the number of holes in the aperture must be limited to 16, since a larger number of holes has hardly any advantages.

Abstract

A flotation cell with at least one injector for introducing a fluid and aspirating air therethrough has a multi-hole aperture plate. Premixing tube sections are disposed in the injector downstream from the aperture plate at a distance from the plate of at least 0.1 times the diameter of a hole in the aperture plate. The tube sections are oriented perpendicular to the aperture plate and open into a mixing tube.

Description

Die Erfindung betrifft eine Flotationszelle mit mindestens einem Injektor entsprechend dem Oberbegriff des Patentanspruchs 1. Eine derartige Flotationszelle ist bekannt aus der Druckschrift "5 Jahre Betriebserfahrung mit der pneumatischen Flotation in der Steinkohleaufarbeitung" von A. Bahr, K. Legner, H. Lüdke, F. W. Mehrhoff in Aufbereitungstechnik, 28 (1987) S. 1 - 9. Die in dieser Schrift offenbarte Zelle zeichnet sich durch einen sektionierten Rohrkörper aus, wobei in jede einzelne Sektion die Suspension aus einem Zentralrohr mit Hilfe einer trichterförmigen Öffnung eintritt, wodurch sich eine laminare Suspensionsströmung ergibt. Eine andere derartige Zelle offenbart die EP-A-0277327. Bei dieser Anordnung befindet sich die Blende innerhalb eines Zufuhrrohres der Flotationszelle für die Suspension, und zwar am Beginn eines Mischrohrabschnittes dieser Zufuhrleitung. Dabei sind kurz nach der Blende - also stromabwärts - Luftzufuhrschlitze in dem Mischrohrabschnitt vorgesehen, und zwar verteilt über dessen Umfang. Hierbei ist praktisch nur eine Anordnung sinnvoll, bei der sich die Öffnungen (Löcher) der Blende in der Nähe vom Umfang derselben befinden. Dies ist eine nicht sehr wirkungsvolle Anordnung. Es ist auch schon versucht worden, durch eine Anordnung mit einem Mehrfachinjektor gemäß DE-A-36 34 903 die geringe Durchsatzmenge der beschriebenen Blende zu erhöhen. Auch hier ist die Arbeitsweise wegen der Aufteilung auf die verschiedenen Injektoren - die jeweils mit eigenen Mischrohr ausgebildet sind - von zu geringer Effektivität begleitet.The invention relates to a flotation cell with at least one injector according to the preamble of claim 1. Such a flotation cell is known from the publication "5 years of operating experience with pneumatic flotation in hard coal processing" by A. Bahr, K. Legner, H. Lüdke, FW Mehrhoff in Aufbereitungstechnik, 28 (1987) pp. 1 - 9. The cell disclosed in this document is characterized by a sectioned tubular body, with the suspension from a central tube entering each individual section with the aid of a funnel-shaped opening, resulting in a laminar suspension flow results. Another such cell is disclosed in EP-A-0277327. In this arrangement, the diaphragm is located within a feed tube of the flotation cell for the suspension, specifically at the beginning of a mixing tube section of this feed line. Shortly after the orifice - that is to say downstream - air supply slots are provided in the mixing tube section, and distributed over its circumference. In this case, practically only one arrangement makes sense in which the openings (holes) of the diaphragm are close to the circumference of the same. This is not a very effective arrangement. Attempts have also been made to increase the small throughput of the orifice described by an arrangement with a multiple injector according to DE-A-36 34 903. Here too, the way of working is accompanied by insufficient effectiveness due to the distribution among the different injectors - each of which is designed with its own mixing tube.

Die Aufgabe der Erfindung ist es, demgegenüber, eine Flotationseinrichtung mit einem Injektor anzugeben, der bei sehr hohen Durchsatzmengen arbeitet, d.h. Luftblasen in genügend großer Menge in der Suspension verteilt.In contrast, the object of the invention is to provide a flotation device with an injector which works at very high throughput quantities, ie air bubbles are distributed in the suspension in a sufficiently large quantity.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruches 1 gelöst. Erfindungsgemäß wird durch eine relativ gleichmäßige Verteilung der Löcher der Blende über deren gesamten Querschnitt ein sehr großer Durchsatz der Suspension möglich. Durch die kleinen Mischrohrabschnitte, die den Löchern nachgeschaltet sind, erfolgt eine gute Verteilung einer ausreichenden Zahl von Luftbläschen in der Suspension. Die endgültige Verteilung erfolgt dann in dem nachgeschalteten Mischrohrabschnitt, der im wesentlichen einen Durchmesser entsprechend dem Außendurchmesser der Blende hat. Die abschließende Beruhigung und Verteilung der Strömung erfolgt durch einen Radialdiffusor am Ende des Mischrohres. Dies ist aber auch aus der eingangs erwähnten EP-A-0277327 bekannt. Dieser Radialdiffusor führt zu einer guten Verteilung der Luftbläschen in dem Flotationsbehälter durch die im wesentlichen horizontale Ausströmung an seinem Austrittsbereich.This object is achieved by the features of claim 1. According to the invention, a very large throughput of the suspension is possible through a relatively uniform distribution of the holes in the diaphragm over its entire cross section. The small mixing tube sections that follow the holes ensure a good distribution of a sufficient number of air bubbles in the suspension. The final distribution then takes place in the downstream mixing tube section, which essentially has a diameter corresponding to the outer diameter of the orifice. The flow is then calmed down and distributed by a radial diffuser at the end of the mixing tube. However, this is also known from EP-A-0277327 mentioned at the beginning. This radial diffuser leads to a good distribution of the air bubbles in the flotation container due to the essentially horizontal outflow at its outlet area.

Vorzugsweise ist jedem Loch der Blende ein eigener Vormischungs-Rohrabschnitt zugeordnet, um eine möglichst gute Luftansaugung zu erreichen. Diese hohe Luftmenge soll durch hohe Turbulenz im Vorvermischungsrohr gut mit der Suspension vermischt werden.Each hole of the diaphragm is preferably assigned its own premix tube section in order to achieve the best possible air intake. This high amount of air should be mixed well with the suspension due to high turbulence in the premixing tube.

Es sind Injektoren denkbar, bei denen mehreren Löchern der Blende zusammengefaßt ein eigenes Durchmischungsrohr zugeordnet ist, jedoch scheint hier Effektivität insgesamt nicht so gut zu sein.Injectors are conceivable in which a separate mixing tube is assigned to several holes of the orifice, but overall effectiveness does not seem to be so good here.

Nachfolgend wird die Erfindung anhand den Figuren der Zeichnung erläutert; dabei stellt Figur 1 prinzipmäßig einen Querschnitt durch eine Flotationszelle mit dem erfindungsgemäßen Injektor, Figur 3 eine Draufsicht auf diesen und insbesondere die Blende, und Figur 4 eine andere Blendenanordnung dar.The invention is explained below with reference to the figures of the drawing; 1 shows in principle a cross section through a flotation cell with the injector according to the invention, FIG. 3 shows a top view of this and in particular the diaphragm, and FIG. 4 shows another diaphragm arrangement.

Die Flotationszelle nach Figur 1 hat ein im wesentlichen im Querschnitt ovales Gehäuse 20, in welches exzentrisch - also in der Nähe einer Schmalseite desselben - ein Injektor 1 hineingeführt ist, der etwa 50 - 100 cm unterhalb des Suspensionsniveaus endet. Dieses Niveau wird eingestellt durch ein mittels Verstellstange 25 einstellbares Wehr 22, über deren Überlaufkante den Schmutz enthaltender Schaum zusammen mit einem gewissen Suspensionsanteil in die Schaumrinne 21 abströmt. In dem Injektor 1 erfolgt die Begasung der Suspension vorzugsweise mit Luft. Dazu weist gemäß Figur 2 das vertikale Zufuhrrohr 6 des Injektors eine Blende 2 auf, die mit Durchtrittsöffnungen in Form von runden Löchern 3 versehen ist, die gleichmäßig über den Umfang der Blende verteilt sind (siehe Figur 3). In diesem Fall ist jedem Loch 3 ein Rohrabschnitt 7 kleinen Durchmessers nachgeschaltet, der als Vormischstrecke dient. Die Entfernung zwischen der Blende und dem Rohrabschnitt 7 hat vorzugsweise einen Wert zwischen dem 0,15-fachen und dem 1,5-fachen des Lochdurchmessers. Die Länge der kleinen Rohrabschnitte 7 beträgt vorzugsweise das 4- bis 10-fache ihres Innendurchmessers oder mindestens das 0,8-fache des Innendurchmessers des der Blende nachgeschalteten Mischrohrabschnitts 6', welcher wiederum etwa den gleichen Durchmesser hat wie der Außendurchmesser der Blende 2 beträgt. Praktisch hat vorzugsweise der Injektor ein durchgehendes Rohr als Außenwand. An seinem Ende befindet sich jedoch ein Radialdiffusor 4 mit einer Bodenplatte 5, die gegenüber dem Rohr 6' einen Spalt 15 freiläßt, der etwa 7-14 % des Durchmessers des Mischrohrs 6' beträgt.The flotation cell according to FIG. 1 has a housing 20 which is essentially oval in cross section and into which it is eccentric - that is to say in the vicinity of a narrow side the same - an injector 1 is inserted, which ends about 50 - 100 cm below the suspension level. This level is set by means of a weir 22 which can be adjusted by means of the adjusting rod 25 and over the overflow edge of which the foam containing dirt flows out into the foam channel 21 together with a certain proportion of the suspension. In the injector 1, the suspension is preferably gassed with air. For this purpose, according to FIG. 2, the vertical feed tube 6 of the injector has an orifice 2 which is provided with through openings in the form of round holes 3 which are distributed uniformly over the circumference of the orifice (see FIG. 3). In this case, each hole 3 is followed by a pipe section 7 of small diameter, which serves as a premixing section. The distance between the diaphragm and the pipe section 7 preferably has a value between 0.15 times and 1.5 times the hole diameter. The length of the small pipe sections 7 is preferably 4 to 10 times their inner diameter or at least 0.8 times the inner diameter of the mixing pipe section 6 'connected downstream of the orifice, which in turn has approximately the same diameter as the outer diameter of the orifice 2. In practice, the injector preferably has a continuous tube as the outer wall. However, at its end there is a radial diffuser 4 with a base plate 5, which leaves a gap 15 with respect to the tube 6 ', which is approximately 7-14% of the diameter of the mixing tube 6'.

Für einen ausreichenden Durchsatz kann man als durchschnittliche Strömungsgeschwindigkeit zur Blende etwa 2 m/s ansetzen, so daß sich aufgrund der dargestellten geometrischen Verhältnisse eine Strömungsgeschwindigkeit hinter den Blendenlöchern von 12,5 m/s und nach den Vormischrohren 7 von etwa 4,5 m/s ergibt. Die Ausströmgeschwindigkeit aus dem Radialdiffusor 4 beträgt dann etwa 2,2 m/s. Dies ist aber nur ein Beispiel. Die Ansaugung der Luft durch die als kleine Injektoren wirkenden Rohrabschnitte 7 erfolgt in einem Rohrabschnitt 9 der Zufuhrleitung, der der Blende nachgeschaltet ist. Dieser weist mindestens einen Luftanschluß auf.For a sufficient throughput, the average flow velocity to the orifice can be set at about 2 m / s, so that due to the geometric conditions shown, a flow velocity behind the orifice holes of 12.5 m / s and after the premixing tubes 7 of about 4.5 m / s s results. The outflow speed from the radial diffuser 4 is then about 2.2 m / s. But this is just an example. The air is sucked in through the pipe sections 7, which act as small injectors, in a pipe section 9 of the supply line, which is connected downstream of the diaphragm. This has at least one air connection.

Hier kann ein Ventil eingeschaltet werden, um die angesaugte Luftmenge zu steuern. Es ist günstig, wenn die Rohrabschnitte 7 mindestens 10 mm aus dem Luftansaugabschnitt 9 herausragen. Die Blendenlöcher brauchen nicht genau kreisrund zu sein, ebenso wie dann der Querschnitt der Rohrabschnitte 7, z.B. kommt ein relativ gleichmäßiges Polygon oder eine Ellipse infrage. Der Innendurchmesser der kleinen Rohrabschnitte sollte mindestens 10 % größer sein als der Durchmesser der Löcher der Blende.A valve can be switched on here to control the amount of air sucked in. It is favorable if the pipe sections 7 protrude at least 10 mm from the air intake section 9. The aperture holes do not need to be exactly circular, as does the cross section of the pipe sections 7, e.g. a relatively even polygon or an ellipse is possible. The inside diameter of the small pipe sections should be at least 10% larger than the diameter of the holes in the panel.

In Figur 4 ist dargestellt, daß auch eine andere, etwa gleichmäßige Verteilung der Löcher der Blende als Figur 2 und 3 vorgesehen sein kann.FIG. 4 shows that a different, approximately uniform distribution of the holes in the diaphragm can also be provided as in FIGS. 2 and 3.

Praktisch ist die Lochzahl der Blende auf 16 zu begrenzen, da eine höhere Lochzahl kaum Vorteile bringt.In practice, the number of holes in the aperture must be limited to 16, since a larger number of holes has hardly any advantages.

Claims (6)

  1. Flotation cell with at least one injector (1) for delivering the suspension, in which the injector comprises a feed pipe (6) and the feed pipe (6) has a pipe section (9) with an air suction or feeder opening, characterised in that a multihole screen (2) is provided for drawing in air, whereby pipe sections (7) are arranged at a distance from the holes (3) of the screen, said distance being at least 0.1 times the hole diameter and at most 1.5 times the hole diameter and the sections being aligned essentially perpendicular to the screen (2) and exiting into a mixer pipe (6') or a mixer pipe section.
  2. Flotation cell according to claim 1, characterised in that a separate pipe section (7) is assigned to each hole (3) of the screen (2).
  3. Flotation cell according to claim 2, characterised in that the pipe sections (7) have an inside diameter of at least 1.05 times the diameter of the assigned hole, whereby the pipe sections and the holes are designed to be circular.
  4. Flotation cell according to one of claims 1 to 3, characterised in that the pipe section (9) is arranged below the screen (2) and has essentially the same exterior wall as the mixer pipe (6') and contains the pipe sections (7) of smaller diameter at least in their initial region assigned to the holes (3) of the screen (2).
  5. Flotation cell according to one of claims 1 to 4, characterised in that the pipe sections (7) of small diameter project at least 10 mm out of the air suction section (9).
  6. Flotation cell according to one of claims 1 to 5, characterised in that the holes (3) of the screen (2) are arranged distributed evenly in a ring over the screen, if necessary with a central additional hole.
EP94103560A 1993-03-26 1994-03-09 Flotation cell with an injector Expired - Lifetime EP0622122B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4309918A DE4309918C2 (en) 1993-03-26 1993-03-26 Flotation cell with an injector
DE4309918 1993-03-26

Publications (2)

Publication Number Publication Date
EP0622122A1 EP0622122A1 (en) 1994-11-02
EP0622122B1 true EP0622122B1 (en) 1997-06-04

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US (1) US5465848A (en)
EP (1) EP0622122B1 (en)
JP (1) JP3423404B2 (en)
KR (1) KR940021110A (en)
AT (1) ATE153881T1 (en)
BR (1) BR9400883A (en)
CA (1) CA2119936C (en)
DE (1) DE4309918C2 (en)
FI (1) FI113748B (en)
NO (1) NO301968B1 (en)
TW (1) TW237390B (en)

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KR940021110A (en) 1994-10-17
FI941411A (en) 1994-09-27
NO941113L (en) 1994-09-27
DE4309918A1 (en) 1993-08-19
US5465848A (en) 1995-11-14
ATE153881T1 (en) 1997-06-15
FI941411A0 (en) 1994-03-25
EP0622122A1 (en) 1994-11-02
NO301968B1 (en) 1998-01-05
JPH07856A (en) 1995-01-06
TW237390B (en) 1995-01-01
BR9400883A (en) 1994-11-01
FI113748B (en) 2004-06-15
CA2119936C (en) 1999-04-27
JP3423404B2 (en) 2003-07-07
DE4309918C2 (en) 1994-09-15
NO941113D0 (en) 1994-03-25
CA2119936A1 (en) 1994-09-27

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