EP0243690A2 - Flotation tank or cell - Google Patents

Flotation tank or cell Download PDF

Info

Publication number
EP0243690A2
EP0243690A2 EP87104540A EP87104540A EP0243690A2 EP 0243690 A2 EP0243690 A2 EP 0243690A2 EP 87104540 A EP87104540 A EP 87104540A EP 87104540 A EP87104540 A EP 87104540A EP 0243690 A2 EP0243690 A2 EP 0243690A2
Authority
EP
European Patent Office
Prior art keywords
container
flotation cell
mixing tube
flotation
cell according
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
EP87104540A
Other languages
German (de)
French (fr)
Other versions
EP0243690A3 (en
EP0243690B1 (en
Inventor
Peter Schweiss
Hans-Dieter Dörflinger
Hans-Otto Henrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT87104540T priority Critical patent/ATE69398T1/en
Publication of EP0243690A2 publication Critical patent/EP0243690A2/en
Publication of EP0243690A3 publication Critical patent/EP0243690A3/en
Application granted granted Critical
Publication of EP0243690B1 publication Critical patent/EP0243690B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
    • 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
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1456—Feed mechanisms for the slurry
    • 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
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
    • 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
    • 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 tank according to the preamble of claim 1.
  • a flotation tank is known from DE-OS 31 20 202.
  • a flotation container with an injector device has become known (US Pat. No. 4,110,210), in which the injector mouth is approximately halfway between the suspension level and the bottom of the Container is arranged.
  • the injector mouth is approximately halfway between the suspension level and the bottom of the Container is arranged.
  • the foam outlet is provided on the other side, namely on the straight longitudinal wall of the flotation container, and the outflow direction of the injector is essentially vertical, with a mixing section or a mixing tube missing.
  • the object of the invention is to achieve a good flotation effect without additional dilution of the suspension with good foam removal, despite the simplicity of a flotation container constructed as just described.
  • the mixing tube 1 dips essentially vertically from above after it has passed through the jacket wall of the container is in the suspension.
  • the mouth 2, which is designed as a radial diffuser, is located a considerable distance above the bottom of the container, the distance between the suspension surface or the overflow edge 7 of the foam discharge opening being considerably greater than the distance between the mouth 2 and the container bottom.
  • the ratio of the distances f 1 / f 2 is approximately between 0.3 and 0.5, preferably between 0.3 and 0.4.
  • the foam discharge opening 6 leads the foam to a foam channel 8 which extends axially along the jacket of the container. On the same side as the foam channel 8 there is also the liquid discharge opening 9 with a discharge flange 10. This discharge opening 9 is located very far down, practically on the bottom of the container.
  • the central axis of the mixing tube 1, through which the entire amount of suspension supplied to each flotation cell is introduced, is located in the half of the container which lies on the other side of the foam channel 8 and the discharge opening 9.
  • the distance 11 from the central axis (vertical diameter) of the flotation tank is preferably between 0.15 and 0.25 times, most preferably between 0.18 and 0.22 times the diameter D of the cross-sectional area shown Flotation cell.
  • This cell or the container is designed as a horizontal cylinder, that is to say has a base body with an essentially circular cross section. A horizontal ellipse can also be used as a cross section. Then the ratio of the distance 1 1 just referred to the horizontal diameter of the ellipse.
  • the cover plate 11 which covers the discharge opening 9 and creates a discharge channel 12, which extends along the container shell, preferably from one boundary wall 19 of each flotation cell to the other boundary wall 20.
  • trigger slots 13 and 14 are provided in the region of the shell of the flotation container , wherein the upper trigger slot 14 has a gap width which is between 0.1 and 0.3 times is preferably between 0.2 and 0.3 times, and the lower discharge slot has a gap width which is between 0.1 and 0.2 times the inside diameter of the mixing tube 1.
  • the cover wall preferably has an arcuate course, which - as shown - can also be approximately polygonal, so that its upper surface is inclined obliquely upward in order to prevent air from becoming stuck in the exhaust duct 12.
  • the injector preferably has an orifice 3 close to the surface of the suspension, followed by air intake slots 5 in the jacket of the mixing tube 1. As shown in dash-dotted lines, a central air intake pipe 21 can also be passed through the diaphragm.
  • the arrangement shown results in the best possible flotation effect with the greatest possible utilization of the entire container cross section.
  • the container cross-section is used to the greatest possible extent, it being possible to increase the throughput of the suspension considerably without the flotation effect being impaired; On the contrary, the flotation effect is significantly improved, so that the number of flotation cells connected in series can still be reduced. It must be taken into account here that the vertical component of the suspension flowing downward must be lower than the rate of ascent of the air bubbles with attached dirt particles. Neither these air bubbles, nor air bubbles at all, should get into the discharge opening 9.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Physical Water Treatments (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)

Abstract

A flotation cell featuring a mixing pipe which enters the suspension essentially vertically, follows the point of air intake, and generally receives the entire suspension quantity per flotation cell, the injector of the flotation cell is offset sideways relative to the vertical center axis of the round container cross-section and away from the side on which the foam removal opening and the liquid drain opening are located. The mixing pipe (1) enters the suspension only for a distance such that its discharge opening, mouth (2), is located at least at one-half the height of the level of the overflow edge (7) of the foam removal channel (8), figured from the container bottom. The liquid drain opening (9) is preferably provided in the immediate vicinity of the container bottom, with a cover plate (11) extending across the length of the flotation cell and forming a drain channel (12) into which proceeds the clean liquid through an upper (14) and a lower (13) slot.

Description

Die Erfindung betrifft einen Flotationsbehälter entsprechend dem Oberbegriff des Patentanspruchs 1. Ein solcher Flotationsbe­hälter ist bekannt aus DE-OS 31 20 202.The invention relates to a flotation tank according to the preamble of claim 1. Such a flotation tank is known from DE-OS 31 20 202.

Es sind bereits auch ähnliche Flotationsbehälter bekanntgewor­den, bei welchen ebenfalls die Injektormündung sehr dicht ober­halb des Bodens des Flotationsbehälters angeordnet ist (US-PS 42 55 262). Hier ist ein eckiger Behälter verwendet wor­den mit Schaumabzug zu beiden Längsseiten, während die Weiter­leitung der Flüssigkeit (Suspension) von einer benachbarten zur anderen Zelle seitlich über senkrechte, schmale Öffnungen in den Trennwänden, die zwischen den einzelnen Zellen angeordnet sind, erfolgt.Similar flotation containers have also become known, in which the injector mouth is also arranged very close to the bottom of the flotation container (US Pat. No. 4,255,262). Here, an angular container has been used with foam extraction on both long sides, while the liquid (suspension) is passed on from side to side via vertical, narrow openings in the dividing walls which are arranged between the individual cells.

Ferner ist ein Flotationsbehälter mit Injektoreinrichtung be­kanntgeworden (US-PS 41 10 210), bei welcher die Injektormündung etwa auf halbem Wege zwischen Suspensionsspiegel und Boden des Behälters angeordnet ist. Auch hier ist ein eckiger Behälter vorhanden, dessen Seitenwände unten abgeschrägt sind, jedoch ist der Schaumabzug an der anderen Seite, nämlich an der geraden Längswand des Flotationsbehälters vorgesehen, und die Ausström­richtung des Injektors ist im wesentlichen vertikal, wobei eine Mischstrecke oder ein Mischrohr fehlen. Bei allen diesen Flota­tionsbehältern mit einzigem Injektorzufluß ist es schwierig, geeignete Strömungsbedingungen zu schaffen, um trotz des ver­hältnismäßig geringen Aufwandes, beruhend auf der Verwendung nur eines einzigen Injektors, einen guten Flotationseffekt und auch einen guten Schaumabzug zu erreichen. Im letzten Falle ist ver­sucht worden, durch spezielle Ausbildung eines nach dem Ventu­ri-Prinzip arbeitenden Injektors mit Zuführung einer Luft-Was­ser-Mischung, den Flotationseffekt zu verbessern. Dies hat den Nachteil, daß bei einer Hintereinanderschaltung von mehreren Flotationszellen von Zelle zu Zelle eine Verdünnung der zu flo­tierenden Suspension erfolgt. Ferner ergibt das Venturi-Prinzip keine geeignete Bläschengröße.Furthermore, a flotation container with an injector device has become known (US Pat. No. 4,110,210), in which the injector mouth is approximately halfway between the suspension level and the bottom of the Container is arranged. Here too there is an angular container, the side walls of which are chamfered at the bottom, but the foam outlet is provided on the other side, namely on the straight longitudinal wall of the flotation container, and the outflow direction of the injector is essentially vertical, with a mixing section or a mixing tube missing. In all of these flotation containers with a single injector inflow, it is difficult to create suitable flow conditions in order to achieve a good flotation effect and also a good foam draw-off, despite the relatively small outlay based on the use of only a single injector. In the latter case, attempts have been made to improve the flotation effect by specially designing an injector which works on the Venturi principle and supplies an air / water mixture. This has the disadvantage that when a number of flotation cells are connected in series from cell to cell, the suspension to be flotated is diluted. Furthermore, the Venturi principle does not result in a suitable bubble size.

Die Aufgabe der Erfindung ist es, trotz der Einfachheit eines wie eben beschrieben aufgebauten Flotationsbehälters einen guten Flotationseffekt ohne zusätzliche Verdünnung der Suspension bei gutem Schaumabzug zu erzielen.The object of the invention is to achieve a good flotation effect without additional dilution of the suspension with good foam removal, despite the simplicity of a flotation container constructed as just described.

Nachfolgend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert, wobei

  • Fig. 1 einen Querschnitt durch den Flotationsbehälter und
  • Fig.2 eine Draufsicht im wesentlichen einer einzigen Flo­tationszelle zeigt.
The invention is explained below using an exemplary embodiment shown in the drawing, wherein
  • Fig. 1 shows a cross section through the flotation tank and
  • 2 shows a plan view essentially of a single flotation cell.

Das Mischrohr 1 taucht im wesentlichen senkrecht von oben, nach­dem es durch die Mantelwandung des Behälters hindurchgeführt ist, in die Suspension ein. Die Mündung 2, die als Radialdif­fusor ausgeführt ist, befindet sich ein erhebliches Stück ober­halb des Bodens des Behälters, wobei die Distanz zwischen der Suspensionsoberfläche bzw. der Überlaufkante 7 der Schaumabzugs­öffnung erheblich größer als die Distanz zwischen der Mündung 2 und dem Behälterboden ist. Das Verhältnis der Distanzen f₁/f₂ beträgt etwa zwischen 0,3 und 0,5, vorzugsweise zwi­schen 0,3 und 0,4. Die Schaumabzugsöffnung 6 führt den Schaum zu einer sich axial längs des Mantels des Behälters erstreckenden Schaumrinne 8. Auf der gleichen Seite wie die Schaumrinne 8 be­findet sich auch die Flüssigkeitsabzugsöffnung 9 mit Abzugs­flansch 10. Diese Abzugsöffnung 9 befindet sich sehr weit unten, praktisch am Behälterboden. Die Mittelachse des Mischrohrs 1, durch welches die gesamte jeder Flotationszelle zugeführte Sus­pensionsmenge eingeleitet wird, befindet sich in der Behälter­hälfte, die auf der anderen Seite von Schaumrinne 8 und Abzugs­öffnung 9 liegt. Die Entfernung 1₁ von der Mittelachse (senk­rechter Durchmesser) des Flotationsbehälters beträgt vorzugswei­se zwischen dem 0,15- und dem 0,25-fachen, am günstigsten zwi­schen dem 0,18- und dem 0,22-fachen des Durchmessers D der ge­zeigten Querschnittsfläche der Flotationszelle. Diese Zelle bzw. der Behälter ist als liegender Zylinder ausgebildet, weist also einen Grundkörper mit im wesentlichen kreisrunden Querschnitt auf. Auch eine liegende Ellipse als Querschnitt kommt in Be­tracht. Dann bezieht sich das eben angegebene Verhältnis der Distanz 1₁ auf den horizontalen Durchmesser der Ellipse.The mixing tube 1 dips essentially vertically from above after it has passed through the jacket wall of the container is in the suspension. The mouth 2, which is designed as a radial diffuser, is located a considerable distance above the bottom of the container, the distance between the suspension surface or the overflow edge 7 of the foam discharge opening being considerably greater than the distance between the mouth 2 and the container bottom. The ratio of the distances f 1 / f 2 is approximately between 0.3 and 0.5, preferably between 0.3 and 0.4. The foam discharge opening 6 leads the foam to a foam channel 8 which extends axially along the jacket of the container. On the same side as the foam channel 8 there is also the liquid discharge opening 9 with a discharge flange 10. This discharge opening 9 is located very far down, practically on the bottom of the container. The central axis of the mixing tube 1, through which the entire amount of suspension supplied to each flotation cell is introduced, is located in the half of the container which lies on the other side of the foam channel 8 and the discharge opening 9. The distance 1₁ from the central axis (vertical diameter) of the flotation tank is preferably between 0.15 and 0.25 times, most preferably between 0.18 and 0.22 times the diameter D of the cross-sectional area shown Flotation cell. This cell or the container is designed as a horizontal cylinder, that is to say has a base body with an essentially circular cross section. A horizontal ellipse can also be used as a cross section. Then the ratio of the distance 1 1 just referred to the horizontal diameter of the ellipse.

Wichtig ist das Abdeckblech 11, das die Abzugsöffnung 9 abdeckt und einen Abzugskanal 12 schafft, der sich längs des Behälter­mantels erstreckt, und zwar vorzugsweise von einer Begrenzungs­wand 19 jeder Flotationszelle zur anderen Begrenzungswand 20. Im Bereich des Mantels des Flotationsbehälters sind Abzugsschlitze 13 und 14 vorgesehen, wobei der obere Abzugsschlitz 14 eine Spaltweite hat, die zwischen dem 0,1- und dem 0,3-fachen, vor­ zugsweise zwischen dem 0,2- und dem 0,3-fachen beträgt, und der untere Abzugsschlitz eine Spaltweite, die zwischen dem 0,1- und dem 0,2-fachen des Innendurchmessers des Mischrohrs 1 beträgt, aufweist. Dabei hat die Abdeckwand vorzugsweise einen bogenför­migen Verlauf, der auch - wie dargestellt - etwa polygonförmig sein kann, so daß seine obere Fläche schräg nach oben geneigt ist, um ein Festsetzen von Luft im Abzugskanal 12 zu verhindern.What is important is the cover plate 11, which covers the discharge opening 9 and creates a discharge channel 12, which extends along the container shell, preferably from one boundary wall 19 of each flotation cell to the other boundary wall 20. In the region of the shell of the flotation container, trigger slots 13 and 14 are provided , wherein the upper trigger slot 14 has a gap width which is between 0.1 and 0.3 times is preferably between 0.2 and 0.3 times, and the lower discharge slot has a gap width which is between 0.1 and 0.2 times the inside diameter of the mixing tube 1. The cover wall preferably has an arcuate course, which - as shown - can also be approximately polygonal, so that its upper surface is inclined obliquely upward in order to prevent air from becoming stuck in the exhaust duct 12.

Der Injektor weist vorzugsweise dicht über der Oberfläche der Suspension eine Blende 3 auf, der Luftansaugschlitze 5 im Mantel des Mischrohrs 1 nachgeschaltet sind. Es kann auch, wie strich­punktiert dargestellt, noch ein zentrales Luftansaugrohr 21 durch die Blende hindurchgeführt werden.The injector preferably has an orifice 3 close to the surface of the suspension, followed by air intake slots 5 in the jacket of the mixing tube 1. As shown in dash-dotted lines, a central air intake pipe 21 can also be passed through the diaphragm.

Mit der dargestellten Anordnung ergibt sich ein bestmöglicher Flotationseffekt unter größtmöglicher Ausnutzung des gesamten Behälterquerschnitts. Bezogen auf den Querschnittsanteil, der von der Suspension ausgefüllt ist, wird der Behälterquerschnitt weitestgehend ausgenutzt, wobei es möglich ist, den Durchsatz der Suspension erheblich zu erhöhen, ohne daß der Flotationsef­fekt beeinträchtigt wird; sondern im Gegenteil, der Flotations­effekt wird noch erheblich verbessert, so daß die Anzahl der hintereinandergeschalteten Flotationszellen noch herabgesetzt werden kann. Es muß hier berücksichtigt werden, daß die Verti­kalkomponente der nach unten abströmenden Suspension kleiner sein muß als die Aufstiegsgeschwindigkeit der Luftbläschen mit angelagerten Schmutzteilchen. Es dürfen weder diese noch über­haupt Luftbläschen im wesentlichen Maße in die Abzugsöffnung 9 gelangen.The arrangement shown results in the best possible flotation effect with the greatest possible utilization of the entire container cross section. Based on the cross-sectional portion that is filled by the suspension, the container cross-section is used to the greatest possible extent, it being possible to increase the throughput of the suspension considerably without the flotation effect being impaired; On the contrary, the flotation effect is significantly improved, so that the number of flotation cells connected in series can still be reduced. It must be taken into account here that the vertical component of the suspension flowing downward must be lower than the rate of ascent of the air bubbles with attached dirt particles. Neither these air bubbles, nor air bubbles at all, should get into the discharge opening 9.

Somit ist es auf die dargestellte Weise möglich, mit einfachen Mitteln und nur einem einzigen Injektor einen hohen Flotations­effekt zu erreichen. Günstig ist dabei weiter, daß sich durch die exzentrische Anordnung des Mischrohres 1 eine starke Abzugs­komponente der Geschwindigkeit des Schaumes in Richtung der Schaumabzugsöffnung 6 einstellt.It is thus possible in the manner shown to achieve a high flotation effect using simple means and only a single injector. It is also advantageous that the eccentric arrangement of the mixing tube 1 results in a strong take-off component of the speed of the foam in the direction of the foam take-off opening 6.

So waren bei einer Anordnung nach der anfangs genannten Offen­legungsschrift bei einer für einen Durchsatz von 11000 l/min konzipierten Flotationszelle sieben bis acht Zellen nötig, wäh­rend bei gleichen Volumen bei einem jetzigen Durchsatz von 15000 bis 16000 l/min nur fünf bis sechs Zellen erforderlich sind.In an arrangement according to the aforementioned publication, seven to eight cells were required for a flotation cell designed for a throughput of 11000 l / min, while only five to six cells are required for the same volume with a current throughput of 15000 to 16000 l / min .

Claims (7)

1. Flotationsbehälter oder -zelle mit Injektoren mit Luftan­saugstelle, die einem im wesentlichen senkrecht in die zu flotierende Flüssigkeit eingetauchten, eine Mündung mit im wesentlichen horizontaler Abströmrichtung aufweisenden Mischrohr vorgeschaltet ist, mit rundem Behälter-Axialquer­schnitt und mit Schaumabzugsquerschnitt mit Überlaufkante und Flüssigkeitsabzug auf ein und derselben Mantelseite des Behälters, dadurch gekennzeichnet, daß die Mittelachse des Mischrohrs (1) von der senkrechten Mittelachse des Behälters zwischen dem 0,15- und 0,25-fachen des Querschnittsdurchmes­sers des Behälters entgegen der Flüssigkeitsabzugsseite seitlich versetzt und die Mündung (2) des Injektors bzw. Mischrohrs (1) in einer Höhe zwischen dem 0,3- und 0,5-fachen der Höhe (Niveau f₂) der Schaumüberlaufkante (7) unterhalb des Niveaus dieser Kante (7) angeordnet ist und die Flüssigkeitsabzugsöffnung (9) in unmittelbarer Nähe des Behälterbodens angeordnet ist.1.Flotation container or cell with injectors with an air suction point, which is immersed essentially vertically in the liquid to be floated, an outlet with an essentially horizontal outflow direction mixing tube is connected upstream, with a round axial container cross section and with a foam discharge cross section with overflow edge and liquid discharge on and The same jacket side of the container, characterized in that the central axis of the mixing tube (1) is laterally offset from the vertical central axis of the container between 0.15 and 0.25 times the cross-sectional diameter of the container against the liquid discharge side, and the mouth (2) of the Injector or mixing tube (1) at a height between 0.3 and 0.5 times the height (level f₂) of the foam overflow edge (7) below the level of this edge (7) and the liquid drain opening (9) in is arranged in the immediate vicinity of the container bottom. 2. Flotationszelle nach Anspruch 1, dadurch gekennzeichnet, daß die Mittelachse des Mischrohrs (1) von der senkrechten Mit­telachse des Behälters zwischen dem 0,18- und 0,22-fachen des Querschnittsdurchmessers des Behälters entgegen der Flüssigkeitsabzugsseite seitlich versetzt ist.2. Flotation cell according to claim 1, characterized in that the central axis of the mixing tube (1) is laterally offset from the vertical central axis of the container between 0.18 and 0.22 times the cross-sectional diameter of the container against the liquid discharge side. 3. Flotationszelle nach Anspruch 1 oder 2, dadurch gekennzeich­net, daß die Mündung (2) des Injektors bzw. des Mischrohrs (1) in einer Höhe zwischen dem 0,3- und 0,45-fachen der Höhe (Niveau) der Schaumüberlaufkante (7) unterhalb des Niveaus dieser Kante (7) angeordnet ist.3. Flotation cell according to claim 1 or 2, characterized in that the mouth (2) of the injector or the mixing tube (1) at a height between 0.3 and 0.45 times the height (level) of the foam overflow edge ( 7) is arranged below the level of this edge (7). 4. Flotationszelle nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß ein durch ein bogenförmiges oder Winkel­blech (11), das die Flüssigkeitsabzugsöffnung (9) überdeckt, gebildeter Flüssigkeitsabzugskanal (12) längs des Behälter­bodens gebildet ist, der jeweils zu dem Mantel des Flota­tionsbehälters oben und unten einen Flüssigkeitsabzugsspalt (13, 14) aufweist.4. Flotation cell according to one of claims 1 to 3, characterized in that a through an arcuate or angled plate (11), which covers the liquid discharge opening (9), formed liquid discharge channel (12) is formed along the bottom of the container, each to the jacket of the Flotation container has a liquid discharge gap (13, 14) at the top and bottom. 5. Flotationszelle nach Anspruch 4, dadurch gekennzeichnet, daß der obere Spalt (14) am Abzugskanal (12) zwischen dem 0,1- und dem 0,3-fachen und der untere Abzugsspalt (13) zwischen dem 0,1- und 0,2-fachen des Innendurchmessers des Mischrohrs (1) beträgt.5. Flotation cell according to claim 4, characterized in that the upper gap (14) on the discharge channel (12) between 0.1 and 0.3 times and the lower discharge gap (13) between 0.1 and 0 , 2 times the inner diameter of the mixing tube (1). 6. Flotationszelle nach Anspruch 5, dadurch gekennzeichnet, daß der obere Abzugsspalt (14) zwischen dem 0,2- und dem 0,3-fachen des Innendurchmessers des Mischrohrs 1 beträgt.6. flotation cell according to claim 5, characterized in that the upper withdrawal gap (14) is between 0.2 and 0.3 times the inner diameter of the mixing tube 1. 7. Flotationszelle nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Mündung (2) des Mischrohrs (1) durch einen Radialdiffusor mit im wesentlichen horizontaler Aus­strömrichtung gebildet ist.7. Flotation cell according to one of claims 1 to 6, characterized in that the mouth (2) of the mixing tube (1) is formed by a radial diffuser with a substantially horizontal outflow direction.
EP87104540A 1986-05-02 1987-03-27 Flotation tank or cell Expired - Lifetime EP0243690B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87104540T ATE69398T1 (en) 1986-05-02 1987-03-27 FLOTATION VESSEL OR CELL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614933A DE3614933C1 (en) 1986-05-02 1986-05-02 Flotation tank or cell
DE3614933 1986-05-02

Publications (3)

Publication Number Publication Date
EP0243690A2 true EP0243690A2 (en) 1987-11-04
EP0243690A3 EP0243690A3 (en) 1989-06-14
EP0243690B1 EP0243690B1 (en) 1991-11-13

Family

ID=6300056

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104540A Expired - Lifetime EP0243690B1 (en) 1986-05-02 1987-03-27 Flotation tank or cell

Country Status (6)

Country Link
US (1) US4726897A (en)
EP (1) EP0243690B1 (en)
JP (1) JP2593309B2 (en)
AT (1) ATE69398T1 (en)
DE (1) DE3614933C1 (en)
ES (1) ES2027648T3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0277327A2 (en) * 1987-02-04 1988-08-10 J.M. Voith GmbH Injector
AT401734B (en) * 1995-04-27 1996-11-25 Trimmel Engelbert Dipl Ing Dr Process and apparatus for bringing a liquid into contact with a gas, especially for cleaning
EP0801989A1 (en) * 1996-04-17 1997-10-22 Voith Sulzer Stoffaufbereitung GmbH Flotation method and mixing device for carrying it out
EP1992735A1 (en) 2003-01-24 2008-11-19 Andritz AG Method and device for aerating suspensions

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1329277C (en) * 1986-09-25 1994-05-03 Graeme John Jameson Column flotation method and apparatus
DE4116916C2 (en) * 1991-05-24 1994-09-22 Escher Wyss Gmbh Flotation device for removing impurities, in particular printing ink, from waste paper suspensions
DE4309918C2 (en) * 1993-03-26 1994-09-15 Voith Gmbh J M Flotation cell with an injector
DE4314507C1 (en) * 1993-05-03 1994-06-23 Voith Gmbh J M Flotation facility injector
US5529190A (en) * 1995-02-06 1996-06-25 Ahlstrom Machinery, Inc. Gas sparged hydrocyclone with foam separating vessel
US6955989B2 (en) * 2001-11-30 2005-10-18 Xerox Corporation Use of a U-groove as an alternative to using a V-groove for protection against dicing induced damage in silicon
AT411155B (en) * 2002-03-27 2003-10-27 Andritz Ag Maschf DEVICE FOR SEPARATING SOLIDS FROM LIQUIDS BY FLOTATION
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
US7537674B1 (en) 2006-06-12 2009-05-26 Narayanasamy Seenivasan Closed floatation de-inking module for recycled paper
JP4538479B2 (en) * 2007-09-04 2010-09-08 日本製紙株式会社 Floatator
DE102008056506A1 (en) * 2008-11-08 2010-05-12 Voith Patent Gmbh mixing device
FI122400B (en) 2010-05-28 2011-12-30 Metso Paper Inc Flotation cell and method for deinking a fiber suspension

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2313127A1 (en) * 1975-06-02 1976-12-31 Envirotech Corp GAS DISPERSION FLOTATION METHOD AND MACHINE
US4255262A (en) * 1979-03-26 1981-03-10 U.S. Filter Corporation Hydraulic powered mixing apparatus
DE3120202A1 (en) * 1981-05-21 1982-12-09 J.M. Voith Gmbh, 7920 Heidenheim Device for the deinking of waste paper by flotation
GB2108858A (en) * 1981-11-07 1983-05-25 Voith Gmbh J M Injection apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110210A (en) * 1975-06-02 1978-08-29 Envirotech Corporation Dispersed gas flotation process
DE2634494C2 (en) * 1976-07-31 1983-04-14 Bayer Ag, 5090 Leverkusen New injectors for liquid gassing
DE3008476A1 (en) * 1980-03-05 1981-09-17 Bayer Ag, 5090 Leverkusen METHOD FOR FLOTATION AND USE OF FUNNEL NOZZLES FOR FLOTATION
EP0037513B1 (en) * 1980-04-09 1984-08-08 Feldmühle Aktiengesellschaft Flotation apparatus for deinking fibrous suspensions
CS216048B1 (en) * 1980-06-16 1982-10-29 Svatopluk Mackrle Appliance for the flotation separation of the suspension or emulsion from the liquids
JPS592435U (en) * 1982-06-25 1984-01-09 三菱重工業株式会社 floating sorter
US4564457A (en) * 1983-11-03 1986-01-14 L'eau Claire Systems, Inc. Upflow gas eductor induced air floatation separator
US4606822A (en) * 1984-11-01 1986-08-19 Miller Francis G Vortex chamber aerator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2313127A1 (en) * 1975-06-02 1976-12-31 Envirotech Corp GAS DISPERSION FLOTATION METHOD AND MACHINE
US4255262A (en) * 1979-03-26 1981-03-10 U.S. Filter Corporation Hydraulic powered mixing apparatus
DE3120202A1 (en) * 1981-05-21 1982-12-09 J.M. Voith Gmbh, 7920 Heidenheim Device for the deinking of waste paper by flotation
GB2108858A (en) * 1981-11-07 1983-05-25 Voith Gmbh J M Injection apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0277327A2 (en) * 1987-02-04 1988-08-10 J.M. Voith GmbH Injector
EP0277327A3 (en) * 1987-02-04 1990-03-28 J.M. Voith Gmbh Injector
AT401734B (en) * 1995-04-27 1996-11-25 Trimmel Engelbert Dipl Ing Dr Process and apparatus for bringing a liquid into contact with a gas, especially for cleaning
EP0801989A1 (en) * 1996-04-17 1997-10-22 Voith Sulzer Stoffaufbereitung GmbH Flotation method and mixing device for carrying it out
US6129212A (en) * 1996-04-17 2000-10-10 Voith Sulzer Stoffaufbereitung Gmbh Flotation process and mixing device
EP1992735A1 (en) 2003-01-24 2008-11-19 Andritz AG Method and device for aerating suspensions

Also Published As

Publication number Publication date
US4726897A (en) 1988-02-23
ES2027648T3 (en) 1992-06-16
ATE69398T1 (en) 1991-11-15
JP2593309B2 (en) 1997-03-26
JPS62262758A (en) 1987-11-14
EP0243690A3 (en) 1989-06-14
DE3614933C1 (en) 1987-10-22
EP0243690B1 (en) 1991-11-13

Similar Documents

Publication Publication Date Title
EP0243690B1 (en) Flotation tank or cell
DE3144386C2 (en) Injector flotation apparatus
DE3872624T2 (en) INJECTORMAL PRESSURE.
DE3153358C2 (en)
DE2202236C3 (en) Washing device
EP1639925A2 (en) Milk foamer with device for forming bubbles
DE4432042C2 (en) Fumigation / flotation reactor with arrangements for separating solids from liquids
DE1301796B (en) Hydrocyclone
DE3120202C2 (en) Device for deinking waste paper through flotation
DE3127290C2 (en) Flotation device for processing waste paper
EP0801989B1 (en) Flotation method
DE1609014B1 (en) PURIFICATION DEVICE FOR WASTE WATER
DE19730464A1 (en) Method and flotation device for removing contaminants from an aqueous fiber suspension
WO1991004087A1 (en) Device for taking up fluids
EP0041728A1 (en) Flotation cell
DE1221397B (en) Melt spinning device for synthetic threads
EP0198073B1 (en) Device for introducing a gas into a liquid
DE3101221C2 (en) "Facility for foam flotation"
DE3015788C2 (en) Flotation device for deinking pulp suspensions
DE804142C (en) Device for degassing a liquid fuel that is supplied to a gasifier or the like at a level kept constant by overflow
DE3223170C2 (en) Injector flotation apparatus
DE8612066U1 (en) Flotation tank or cell
DE19743466C1 (en) Swimming pool water filter has gas collection chamber and controls
DE1751245C (en) Device for separating water from liquid fuels for burner systems
DE1483741C (en) Flotation cell without a stirrer for froth flotation of ores

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH ES FR GB IT LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH ES FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19891017

17Q First examination report despatched

Effective date: 19900921

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH ES FR GB IT LI NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19911113

REF Corresponds to:

Ref document number: 69398

Country of ref document: AT

Date of ref document: 19911115

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ITF It: translation for a ep patent filed

Owner name: STUDIO TORTA SOCIETA' SEMPLICE

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19920327

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19920331

Ref country code: CH

Effective date: 19920331

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2027648

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EAL Se: european patent in force in sweden

Ref document number: 87104540.7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19950331

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19961001

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19961001

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20060313

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20060322

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20060329

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060331

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20070326

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20070328

EUG Se: european patent has lapsed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20070328

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20060314

Year of fee payment: 20