EP0243690B1 - Flotation tank or cell - Google Patents

Flotation tank or cell Download PDF

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Publication number
EP0243690B1
EP0243690B1 EP87104540A EP87104540A EP0243690B1 EP 0243690 B1 EP0243690 B1 EP 0243690B1 EP 87104540 A EP87104540 A EP 87104540A EP 87104540 A EP87104540 A EP 87104540A EP 0243690 B1 EP0243690 B1 EP 0243690B1
Authority
EP
European Patent Office
Prior art keywords
tank
flotation cell
mixing tube
feature
flotation
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
EP87104540A
Other languages
German (de)
French (fr)
Other versions
EP0243690A3 (en
EP0243690A2 (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
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Expired - Lifetime legal-status Critical Current

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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-A-31 20 202.
  • a flotation container with an injector device has become known (US-A-41 10 210), 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 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.
  • the object of the invention is to achieve an improved flotation effect 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 smaller 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, preferably is between 0.2 and 0.3 times, and the lower take-off slot has a gap width which is between 0.1 and 0.2 times the inner 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-dot lines, a central air intake pipe 21 can also be passed through the panel.
  • the arrangement shown results in the best possible flotation effect with maximum 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 considerably 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 smaller than the rate of ascent of the air bubbles with attached dirt particles. Neither these air bubbles, nor any air bubbles at all, should get into the discharge opening 9.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Physical Water Treatments (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (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-A-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-A-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-A-42 55 262). Hier ist ein eckiger Behälter verwendet worden mit Schaumabzug zu beiden Längsseiten, während die Weiterleitung der Flüssigkeit (Suspension) von der einen zur benachbarten Zelle über am Zellenboden befindliche, 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 one to the neighboring cell via narrow openings in the partition walls located between the individual cells.

Ferner ist ein Flotationsbehälter mit Injektoreinrichtung bekanntgeworden (US-A-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-A-41 10 210), 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 verbesserten Flotationseffekt bei gutem Schaumabzug zu erzielen.The object of the invention is to achieve an improved flotation effect with good foam removal despite the simplicity of a flotation container constructed as just described.

Die Aufgabe wird mit dem kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst.The object is achieved with the characterizing features of patent claim 1.

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
a cross section through the flotation tank and
Fig. 2
a plan view essentially shows 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 kleimer 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 smaller 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, vorzugsweise 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, preferably is between 0.2 and 0.3 times, and the lower take-off slot has a gap width which is between 0.1 and 0.2 times the inner 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-dot lines, a central air intake pipe 21 can also be passed through the panel.

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 maximum 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 considerably 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 smaller than the rate of ascent of the air bubbles with attached dirt particles. Neither these air bubbles, nor any 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 above-mentioned laid-open 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. Flotation tank or cell with injectors with air intake point, preceding a mixing tube mainly vertically emerged into the flotating liquid and provided with an outlet with mainly horizontal discharge direction, with round tank axial cross section and with axial overflow edge for foam removal and liquid removal on the same shell side of the tank, characterized by the feature that the central axis of the mixing tube (1) is laterally displaced from the vertical central axis of the axial tank cross section by between 0.15 and 0.25 times the axial cross-section diameter of the tank on the opposite side of the liquid removal side and that the outlet (2) of the injector/mixing tube (1) is arranged at a height distance (f₁) of 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 that the liquid extraction opening (9) is placed in the near vicinity of the tank bottom.
  2. Flotation cell according to claim 1, characterized by the feature that the central axis of the mixing tube (1) is laterally staggered from the vertical central axis of the axial tank cross section by between 0.18 and 0.22 times the axial cross section diameter of the tank on the opposite side of the liquid removal side.
  3. Flotation cell according to claims 1 or 2, characterized by the feature that the outlet (2) of the injector/the mixing tube resp. (1) is arranged at a height distance (f₁) by between 0.3 and 0.45 times the height (level f²) of the foam overflow edge (7) below the level of this edge (7).
  4. Flotation cell according to one of claims 1 to 3, characterized by the feature that a liquid removal duct (12) extending along the tank bottom is formed by a bow-shaped or angle plate (11) which covers the liquid extraction opening (9), which has on top and bottom a liquid removal gap (13, 14) towards the shell of the flotation tank.
  5. Flotation cell according to claim 4, characterized by the feature that the top gap (14) on removal duct (12) is between 0.1 and 0.3 times and the bottom removal gap (13) between 0.1 and 0.2 times the inside diameter of the mixing tube (1).
  6. Flotation cell according to claim 5, characterized by the feature that the top removal gap (14) is between 0.2 and 0.3 times the inside diameter of the mixing tube 1.
  7. Flotation cell according to one of the claims 1 to 6, characterized by the feature that the outlet (2) of the mixing tube (1) is formed by a radial diffusor with a mainly horizontal discharge 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
DE3614933 1986-05-02
DE3614933A DE3614933C1 (en) 1986-05-02 1986-05-02 Flotation tank or cell

Publications (3)

Publication Number Publication Date
EP0243690A2 EP0243690A2 (en) 1987-11-04
EP0243690A3 EP0243690A3 (en) 1989-06-14
EP0243690B1 true 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 (1)

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Publication number Priority date Publication date Assignee Title
DE102008056506A1 (en) * 2008-11-08 2010-05-12 Voith Patent Gmbh mixing device

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
DE3789795T2 (en) * 1986-09-25 1994-11-24 Univ Newcastle Res Ass Column flotation method and device.
DE8701636U1 (de) * 1987-02-04 1987-03-19 J.M. Voith Gmbh, 7920 Heidenheim Injektor
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
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
DE19615089C1 (en) * 1996-04-17 1997-04-10 Voith Sulzer Stoffaufbereitung Paper suspension flotation useful esp. for solid impurity sepn.
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
AT412216B (en) 2003-01-24 2004-11-25 Andritz Ag Maschf METHOD AND DEVICE FOR VENTILATING SUSPENSIONS
US7544271B1 (en) 2006-06-12 2009-06-09 Narayanasamy Seenivasan Open flotation de-inking module for recycled paper
US7537674B1 (en) 2006-06-12 2009-05-26 Narayanasamy Seenivasan Closed floatation de-inking module for recycled paper
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Also Published As

Publication number Publication date
DE3614933C1 (en) 1987-10-22
JP2593309B2 (en) 1997-03-26
EP0243690A3 (en) 1989-06-14
ES2027648T3 (en) 1992-06-16
EP0243690A2 (en) 1987-11-04
JPS62262758A (en) 1987-11-14
US4726897A (en) 1988-02-23
ATE69398T1 (en) 1991-11-15

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