EP0622122A1 - Flotation cell with an injector - Google Patents

Flotation cell with an injector Download PDF

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Publication number
EP0622122A1
EP0622122A1 EP94103560A EP94103560A EP0622122A1 EP 0622122 A1 EP0622122 A1 EP 0622122A1 EP 94103560 A EP94103560 A EP 94103560A EP 94103560 A EP94103560 A EP 94103560A EP 0622122 A1 EP0622122 A1 EP 0622122A1
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EP
European Patent Office
Prior art keywords
flotation cell
diaphragm
tube
holes
hole
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.)
Granted
Application number
EP94103560A
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German (de)
French (fr)
Other versions
EP0622122B1 (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
    • 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
    • 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
    • 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
    • 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
    • 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 with at least one injector according to the preamble of claim 1.
  • Such a cell is known from EP-A 0277327.
  • the screen is located within a feed tube of the flotation cell for the suspension, specifically at the beginning of a mixing tube section this supply 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.
  • 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 already been made to increase the small throughput of the orifice described by an arrangement with a multiple injector according to DE 36 34 903.
  • 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 operates at very high throughput quantities, i.e. Air bubbles distributed in a sufficient amount in the suspension.
  • 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 the latter 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 an injector 1 is inserted eccentrically - ie in the vicinity of a narrow side thereof - which ends approximately 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 pipe 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 10.
  • a valve can be switched on here to control the amount of air sucked in.
  • the pipe sections 7 protrude at least 10 mm from the air intake section 9.
  • the aperture holes need not be exactly circular, just like that Cross-section of the pipe sections 7, for example a relatively uniform polygon or an ellipse.
  • 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.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Nozzles (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

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 solche Zelle ist bekannt aus der 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 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 cell is known from EP-A 0277327. With this arrangement, the screen is located within a feed tube of the flotation cell for the suspension, specifically at the beginning of a mixing tube section this supply 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 already been made to increase the small throughput of the orifice described by an arrangement with a multiple injector according to DE 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 operates at very high throughput quantities, i.e. Air bubbles distributed in a sufficient amount in the suspension.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des kennzeichnenden Teiles des Patentanspruches 1 gelöst. Erfindungsgemäß wird durch eine relativ gleichmäßige Verteilung der Löcher der Blende oder Düsenplatte 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 the characterizing part 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 or nozzle plate over their 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 aperture. 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 the latter 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 an injector 1 is inserted eccentrically - ie in the vicinity of a narrow side thereof - which ends approximately 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. To do so 2, the vertical feed pipe 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 10 auf. 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.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 10. 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 need not be exactly circular, just like that Cross-section of the pipe sections 7, for example a relatively uniform polygon or an ellipse. 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)

Flotationszelle mit mindestens einem Injektor (1) zur Zuführung der Suspension, der zwecks Luftansaugung eine Mehrlochblende (2) aufweist, dadurch gekennzeichnet, daß den Löchern (3) der Blende (2), oder den Düsen einer Düsenplatte (2') Rohrabschnitte in einem Abstand von dieser von mindestens dem 0,1-fachen des Lochdurchmessers nachgeschaltet sind, die im wesentlichen senkrecht zur Blende (2) ausgerichtet sind und in ein Mischrohr (6') oder einen Mischrohrabschnitt münden.Flotation cell with at least one injector (1) for supplying the suspension, which has a multi-hole screen (2) for the purpose of air intake, characterized in that the holes (3) of the screen (2), or the nozzles of a nozzle plate (2 '), have tube sections in one Distance therefrom of at least 0.1 times the hole diameter, which are aligned substantially perpendicular to the diaphragm (2) and open into a mixing tube (6 ') or a mixing tube section. Flotationszelle nach Anspruch 1, dadurch gekennzeichnet, daß jedem Loch (3) der Blende (2) ein eigener Rohrabschnitt (7) zugeordnet ist.Flotation cell according to claim 1, characterized in that each hole (3) of the diaphragm (2) is assigned its own tube section (7). Flotationszelle nach Anspruch 2, dadurch gekennzeichnet, daß die Rohrabschnitte (7) einen Innendurchmesser von mindestens dem 1,05-fachen des Durchmessers des zugehörigen Loches aufweisen, wobei die Rohrabschnitte und die Löcher kreisrund ausgebildet sind.Flotation cell according to claim 2, characterized in that the tube sections (7) have an inner diameter of at least 1.05 times the diameter of the associated hole, the tube sections and the holes being circular. Flotationszelle nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß nach der Blende (2) ein Rohrabschnitt (9) - im wesentlichen mit derselben Außenwandung wie die des Mischrohrs (6') vorgesehen ist, der die den Löchern (3) der Blende (2) oder Düsen der Düsenplatte (2') zugeordneten Rohrabschnitte (7) kleinen Durchmessers zumindest in deren Anfangsbereich enthält und mindestens eine Luftansaug- oder - zufuhröffnung (10) aufweist.Flotation cell according to one of claims 1-3, characterized in that after the diaphragm (2) a tube section (9) - essentially with the same outer wall as that of the mixing tube (6 ') is provided, which covers the holes (3) of the diaphragm (2) or nozzles of the nozzle plate (2 ') associated pipe sections (7) of small diameter at least in their initial area and has at least one air intake or supply opening (10). Flotationszelle nach einem der Ansprüche 1-4, dadurch gekennzeichnet, daß die Rohrabschnitte (7) kleinen Durchmessers mindestens 10 mm aus dem Luftansaugabschnitt (9) herausragen.Flotation cell according to one of claims 1-4, characterized in that the tube sections (7) are small Protrude at least 10 mm from the air intake section (9). Flotationszelle nach einem der Ansprüche 1-5, dadurch gekennzeichnet, daß die Löcher (3) der Blende (2) gleichmäßig, ringförmig verteilt über die Blende ggf. mit einem zentralen weiteren Loch angeordnet sind.Flotation cell according to one of claims 1-5, characterized in that the holes (3) of the diaphragm (2) are arranged uniformly, annularly distributed over the diaphragm, optionally with a further central 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 true EP0622122A1 (en) 1994-11-02
EP0622122B1 EP0622122B1 (en) 1997-06-04

Family

ID=6483968

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Application Number Title Priority Date Filing Date
EP94103560A Expired - Lifetime EP0622122B1 (en) 1993-03-26 1994-03-09 Flotation cell with an injector

Country Status (11)

Country Link
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)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP1350888A2 (en) † 2002-03-27 2003-10-08 Andritz AG Device for separating solids from liquids using flotation

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US5783118A (en) * 1997-07-02 1998-07-21 Kolaini; Ali R. Method for generating microbubbles of gas in a body of liquid
AT408957B (en) * 2000-02-03 2002-04-25 Andritz Ag Maschf METHOD AND DEVICE FOR VENTILATING DISPERSIONS
US6394279B1 (en) 2000-06-16 2002-05-28 Voith Sulzer Paper Technology North America, Inc. Flotation machine for a fiber suspension and method of using same
US6395131B1 (en) 2000-09-19 2002-05-28 Voith Sulzer Paper Technology North America, Inc. Flotation machine for a fiber suspension and method of using same
KR100781820B1 (en) * 2001-02-21 2007-12-03 시부야 코교 가부시키가이샤 Injection apparatus for mixed flow of gas and liquid
ES2283158B1 (en) * 2003-11-10 2008-09-16 Universidad De Sevilla PROCEDURE AND DEVICE FOR THE GENERATION OF FOAMS AND EMULSIONS THROUGH PAIRS OF FACED TUBES.
WO2006056018A1 (en) * 2004-11-26 2006-06-01 The University Of Queensland Improvements to a fluid jet flotation apparatus
AU2005309332C1 (en) * 2004-11-26 2006-11-09 The University Of Queensland Improvements to a fluid jet flotation apparatus
FI122973B (en) * 2005-06-17 2012-09-28 Metso Paper Inc Injector for flotation cell, nozzle part in injector for flotation cell, flotation cell and method for mixing fiber suspension strip and air with each other in injector for flotation cell
FI119554B (en) 2005-10-10 2008-12-31 Metso Paper Inc Diffuser of flotation cell injector
US7537674B1 (en) 2006-06-12 2009-05-26 Narayanasamy Seenivasan Closed floatation de-inking module for recycled paper
US7544271B1 (en) 2006-06-12 2009-06-09 Narayanasamy Seenivasan Open flotation de-inking module for recycled paper
US7562777B1 (en) 2006-06-12 2009-07-21 Narayanasamy Seenivasan Flotation cell injector assembly for use with open or closed flotation deinking modules for recycled paper
FI119998B (en) * 2007-04-05 2009-05-29 Metso Paper Inc Feeding of fiber suspension flow to flotation cell and flotation cell injector
FI119598B (en) * 2007-04-05 2009-01-15 Metso Paper Inc Flotation cell injector
US8771520B2 (en) * 2008-05-31 2014-07-08 Vws Westgarth Limited Fluid treatment apparatus
DE102008056506A1 (en) * 2008-11-08 2010-05-12 Voith Patent Gmbh mixing device
DE102008064270A1 (en) * 2008-12-20 2010-07-01 Voith Patent Gmbh Flotation method for removing contaminants from aqueous fibrous material suspension by gas bubbles, involves supplying stream of fibrous material suspension along interference body after supplying stream of gas
DE102009011046A1 (en) * 2009-02-28 2010-09-02 Voith Patent Gmbh Flotation device for removal of extraneous material from aqueous pulp suspension, has flow divider dividing stream of pulp suspension into multiple partial streams at short section, where partial streams are unified in flow divider
DE102009045965A1 (en) * 2009-10-23 2011-04-28 Voith Patent Gmbh Process for removing solids from a pulp suspension by flotation
JP6042061B2 (en) * 2011-10-12 2016-12-14 Ｊｆｅエンジニアリング株式会社 Spray nozzle, fluid atomizer using the spray nozzle
JP5912393B2 (en) * 2011-10-12 2016-04-27 Ｊｆｅエンジニアリング株式会社 Spray nozzle and method of mixing gas and liquid
CN106269295A (en) * 2016-09-05 2017-01-04 洛阳豫鹭矿业有限责任公司 A kind of flotation column
CN114849503B (en) * 2022-07-07 2022-09-23 北京石油化工学院 Dissolve gas equipment

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EP0277327A2 (en) * 1987-02-04 1988-08-10 J.M. Voith GmbH Injector

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DE3144386C2 (en) * 1981-11-07 1983-12-29 J.M. Voith Gmbh, 7920 Heidenheim Injector flotation apparatus
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CA1329277C (en) * 1986-09-25 1994-05-03 Graeme John Jameson Column flotation method and apparatus
DE3634903A1 (en) * 1986-10-14 1988-04-28 Voith Gmbh J M Flotation device
ZA916774B (en) * 1990-08-27 1992-05-27 Univ Newcastle Res Ass Aeration apparatus with diffuser

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EP0277327A2 (en) * 1987-02-04 1988-08-10 J.M. Voith GmbH Injector

Non-Patent Citations (1)

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Title
BAHR ET AL:: "5Jahre Betriebserfahrung mit der pneumatischen Flotation in der Steinkohlenaufbereitung", AUFBEREITUNGS TECHNIK., vol. 28, no. 1, January 1987 (1987-01-01), WIESBADEN DE, pages 1 - 9 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1350888A2 (en) † 2002-03-27 2003-10-08 Andritz AG Device for separating solids from liquids using flotation
EP1350888B2 (en) † 2002-03-27 2012-04-11 Andritz AG Device for separating solids from liquids using flotation

Also Published As

Publication number Publication date
NO301968B1 (en) 1998-01-05
CA2119936A1 (en) 1994-09-27
NO941113D0 (en) 1994-03-25
BR9400883A (en) 1994-11-01
JPH07856A (en) 1995-01-06
CA2119936C (en) 1999-04-27
TW237390B (en) 1995-01-01
FI941411A0 (en) 1994-03-25
FI113748B (en) 2004-06-15
NO941113L (en) 1994-09-27
EP0622122B1 (en) 1997-06-04
FI941411A (en) 1994-09-27
US5465848A (en) 1995-11-14
KR940021110A (en) 1994-10-17
JP3423404B2 (en) 2003-07-07
DE4309918A1 (en) 1993-08-19
DE4309918C2 (en) 1994-09-15
ATE153881T1 (en) 1997-06-15

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