EP0642833B1 - Procédé pour la séparation de solides par flottation - Google Patents

Procédé pour la séparation de solides par flottation Download PDF

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Publication number
EP0642833B1
EP0642833B1 EP94110775A EP94110775A EP0642833B1 EP 0642833 B1 EP0642833 B1 EP 0642833B1 EP 94110775 A EP94110775 A EP 94110775A EP 94110775 A EP94110775 A EP 94110775A EP 0642833 B1 EP0642833 B1 EP 0642833B1
Authority
EP
European Patent Office
Prior art keywords
flotation
suspension
air
vessel
clarification chamber
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
EP94110775A
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German (de)
English (en)
Other versions
EP0642833A1 (fr
Inventor
Herbert Britz
Alexander Peschl
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.)
Voith Paper Fiber and Environmental Solutions GmbH and Co KG
Original Assignee
Voith Sulzer Stoffaufbereitung 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 Voith Sulzer Stoffaufbereitung GmbH filed Critical Voith Sulzer Stoffaufbereitung GmbH
Publication of EP0642833A1 publication Critical patent/EP0642833A1/fr
Application granted granted Critical
Publication of EP0642833B1 publication Critical patent/EP0642833B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1431—Dissolved air flotation machines
    • 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
    • B03D1/1418—Flotation machines using centrifugal forces
    • 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
    • B03D1/1493—Flotation machines with means for establishing a specified flow pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C3/00—Apparatus in which the axial direction of the vortex flow following a screw-thread type line remains unchanged ; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C3/00—Apparatus in which the axial direction of the vortex flow following a screw-thread type line remains unchanged ; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct
    • B04C3/06—Construction of inlets or outlets to the vortex chamber
    • 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
    • B03D1/245—Injecting gas through perforated or porous area

Definitions

  • the invention relates to a method for separating solids by Flotation from a suspension according to the preamble of claim 1 and to one Device for performing the method.
  • Methods of the type mentioned are used to get out of a suspension at least to excrete a portion of the solid particles suspended therein. The goal this can be done either by removing unwanted components of the suspension or the clarification of polluted wastewater.
  • one Flotation is a foam or floating sludge containing the substances to be separated educated.
  • a typical application for the use of such a method is Preparation of a suspension made of printed waste paper, in which the Ink particles are already detached from the fibers, making them selective let float (deinking flotation).
  • EP-A-0 198 737 shows a flotation device for a process of specified type, in which the suspension during flotation is a Performs rotational movement.
  • the devices shown in this publication however, contain annular partitions through which the rotating suspension during the flotation is slowed in its axial movement and guided radially inwards. By this measure and mostly also in that a deflection of the Suspension, viewed axially, is made, the reinforcement takes place Centrifugal fields, however, optimal flotation is not possible.
  • Another flotation device is known from DE-A-33 06 600, which already use the acceleration field caused by the rotational movement of the suspension can.
  • the flotation foam is there from an overhead pipe Flotation device removed while the cleaned suspension flows off at the bottom.
  • Such current routing is also common with hydrocyclones. she leads to a disproportionate increase in centrifugal acceleration Center of the container in the form of a potential vortex.
  • WO-A-91/15302 describes a variety of different cylindrical Separating devices shown and described, in which with the help of magnets or electrostatic fields a separation process is to be applied. Doing so only the supplementary application of flotation processes in such devices mentioned, whereby their effect seems insignificant. A highly effective one Flotation processes are not shown in this document.
  • the invention had for its object to provide a method which Use of a centrifugal field an even better separation of the suspended Solid particles or the use of relatively compact flotation devices or both allowed.
  • the method according to the invention takes place in the flotation space - viewed axially - no change in the direction of foam transport. This will target the Avoid formation of a potential vortex.
  • the method is as follows carried out that a transport of the floated shares substantially parallel to Rotation axis 5 and in the same direction as that of the superimposed movement 4 (Arrows 6).
  • the floated portions collected in this way are removed from clarification room 1 dissipated, indicated here by the arrows 7, usually together with free, from the air escaping from the suspension foam, arrow 10.
  • For flotation required air is either added to the fabric at the inlet, arrow 9, and / or through Openings in the clarification room 1 during the actual flotation, arrows 9 '.
  • Fig. 2 shows a simplified section through a flotation tank 12 with which the Procedure can be performed.
  • An inlet 13 and an outlet 14 can be seen (shown offset here) and the sludge pipe 15.
  • 13 a turbulence generating device 17 may be present, here as a step diffuser formed in the air in the vicinity of the step jump through an air line 16th is pumped in or sucked in.
  • step diffusers one above the other in the vertical direction, in the radial direction Direction only one intended.
  • Turbulence generation with the help of step diffusers also when entering flotation machines, is known per se, but offers in Connection with the other features of the method according to the invention special advantages. This is related to the task, in the smallest possible space to achieve the best possible flotation effect. Therefore, controlled micro-vertebrae and a force field increased by rotational movement of great benefit.
  • Fig. 3 shows the apparatus of Fig. 2 as a view from above and in particular does tangential inlet 13 and outlet 14 visible.
  • FIG. 4 shows a slightly conical rather than a cylindrical one Flotation tank 12 '.
  • a measure can Rotational motion can be accelerated without adding more energy, which about friction losses could be compensated. It can also be assumed that the total volume of the air flowing out into the center of the flotation tank Suspension becomes lower.
  • Fig. 5 shows part of another suitable for performing the method Flotation device, namely the area of the sludge pipe 15 '.
  • This is as concentric double tube formed so that two different fractions of im central part of the flotation container can be removed. It can be particularly advantageous to concentrate as much as possible Foam fraction 21 separately from a foam / suspension mixed fraction 22 deduct. A further separation step would then result from the latter To win usable things, e.g. unintentionally removed paper fibers.
  • Such a module unit can essentially consist of flotation tanks, as already described.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Physical Water Treatments (AREA)

Claims (20)

  1. Procédé de séparation de matières solides contenues dans une suspension, par flottation dans une enceinte de décantation (1) sensiblement, cylindrique, la suspension exécutant, pendant la flottation, un mouvement de rotation (3) auquel se superpose un autre mouvement (4) qui s'étend sensiblement dans la direction de l'axe de rotation (5), les parties flottantes se déplaçant radialement vers l'intérieur et en outre sensiblement aussi dans la direction de l'axe de rotation (5) et la sortie de la suspension (11) de l'enceinte de décantation (1) s'effectuant tangentiellement, caractérisé en ce que pendant la flottation la suspension tourne à l'intérieur de l'enceinte de décantation (1) cylindrique, sans être guidée radialement vers l'intérieur.
  2. Procédé selon la revendication 1, caractérisé en ce que dans la suspension (2) alimentée, des micro-turbulences sont produites comme connu en soi, tout contre l'entrée dans l'enceinte de décantation (1).
  3. Procédé selon la revendication 1, caractérisé en ce que l'entrée de la suspension (2) s'effectue tangentiellement.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'air (9) nécessaire à la flottation parvient conjointement avec la suspension dans l'enceinte de décantation (1).
  5. Procédé selon les revendications 2 et 4, caractérisé en ce que l'air (9) nécessaire à la flottation est ajouté par mélange dans la région des micro-turbulences.
  6. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'air (9) nécessaire à la flottation est ajouté a la suspension, dans l'enceinte de décantation (1).
  7. Procédé selon la revendication 1 ou 2, caractérisé en ce que la suspension (2) a faire flotter contient de l'air dissous et des bulles d'air nécessaires a la flottation sont produites par une chute de pression dans la suspension.
  8. Procédé selon la revendication 1 ou 2, caractérisé en ce que des parties flottantes sont évacuées de l'enceinte de décantation en plusieurs fractions (21, 22).
  9. Procédé selon la revendication 8, caractérisé en ce qu'une fraction (22) contient des substances qui sont séparées au cours d'une étape de procédé suivante.
  10. Dispositif de flottation pour la mise en oeuvre du procédé selon l'une des revendications précédentes, comportant un récipient de flottation (12, 12'), se tenant verticalement pendant le fonctionnement, présentant sensiblement une symétrie de révolution, au moins une entrée (13) tangentielle pour la suspension à alimenter, des moyens (16, 17, 18, 19) pour la production et la distribution de bulles d'air, au moins une sortie (14) tangentielle pour la suspension à évacuer ainsi que dans la zone centrale du récipient de flottation (12, 12'), au moins un tube à mousse (15, 15') pour les parties flottantes, qui, vu axialement, est disposé sur le côté du récipient de flottation (12, 12') sur lequel se trouve aussi la sortie (14), caractérisé en ce que le récipient de flottation (12, 12') ne présente pas de cloison s'étendant radialement entre l'entrée (13) et la sortie (14).
  11. Dispositif de flottation selon la revendication 10, caractérisé en ce que le récipient de flottation (12, 12') est cylindrique circulaire.
  12. Dispositif de flottation selon la revendication 10, caractérisé en ce que le récipient de flottation (12, 12') se rétrécit vers la sortie.
  13. Dispositif de flottation selon l'une des revendications 10 à 12, caractérisé en ce qu'un générateur de turbulences (17) se trouve dans la zone de l'entrée (13).
  14. Dispositif de flottation selon la revendication 13, caractérisé en ce que le générateur de turbulences (17) est un diffuseur à gradins s'elargissant par paliers.
  15. Dispositif de flottation selon la revendication 13 ou 14, caractérisé en ce que l'air nécessaire à la flottation peut être envoyé dans le générateur de turbulences (17).
  16. Dispositif de flottation selon l'une des revendications 10 à 15, caractérisé en ce que l'air nécessaire à la flottation provenant d'un caisson à air (18) peut être envoyé radialement dans le récipient de flottation (12, 12'), à travers une portion de paroi (20) perméable de ce récipient.
  17. Dispositif de flottation selon l'une des revendications 10 à 16, caractérisé en ce que les bulles d'air nécessaires à la flottation peuvent être produites à l'aide d'un organe d'étranglement, se trouvant devant ou dans l'entrée (13) par abaissement de la pression dans la suspension.
  18. Dispositif de flottation selon l'une des revendications 10 à 16, caractérisé en ce que le rapport du plus grand diamètre intérieur du tube à mousse (15, 15') au plus grand diamètre intérieur du récipient de flottation (12, 12') est supérieur à 0,6.
  19. Dispositif de flottation selon l'une des revendications 10 à 18, caractérisé en ce que le tube à mousse (15') comporte plusieurs tubes, en particulier deux tubes concentriques se recouvrant sensiblement axialement, de sorte que plusieurs fractions différentes, en particulier deux, peuvent être évacuées avec la substance flottante.
  20. Dispositif de flottation selon la revendication 19, caractérisé en ce qu'une sortie tangentielle est constituée d'au moins une enceinte, en particulier l'enceinte radialement extérieure, parmi celles formées par les tubes concentriques.
EP94110775A 1993-09-10 1994-07-12 Procédé pour la séparation de solides par flottation Expired - Lifetime EP0642833B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4330635A DE4330635C2 (de) 1993-09-10 1993-09-10 Verfahren zur Abtrennung von Feststoffen durch Flotation und Flotationsvorrichtung
DE4330635 1993-09-10

Publications (2)

Publication Number Publication Date
EP0642833A1 EP0642833A1 (fr) 1995-03-15
EP0642833B1 true EP0642833B1 (fr) 1998-09-30

Family

ID=6497311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110775A Expired - Lifetime EP0642833B1 (fr) 1993-09-10 1994-07-12 Procédé pour la séparation de solides par flottation

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US (2) US5690812A (fr)
EP (1) EP0642833B1 (fr)
DE (1) DE4330635C2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997018039A1 (fr) * 1994-01-28 1997-05-22 Automatic Control Technology, Inc. Systeme de cyclone pour separer des particules d'un flux de liquide
DE19618529B4 (de) * 1996-05-08 2005-12-22 Papiertechnische Stiftung (Pts) Verwendung einer rotationssymmetrischen Zelle und Vorrichtung zur Stoffgemischtrennung bei der Aufbereitung und Reinigung bedruckter Altpapiere
DE19728394A1 (de) * 1997-07-03 1999-01-07 Voith Sulzer Stoffaufbereitung Verfahren zur Entfernung von Feststoffen aus einer wässrigen Faserstoffsuspension
DE19835434C2 (de) * 1998-08-05 2000-08-17 Wolfgang Reuschl Vorrichtung und Verfahren zur sterilen Abtrennung von Feststoffpartikeln aus Suspensionen mittels pneumatischer Flotation in kontinuierlicher Betriebsweise
US20030194755A1 (en) * 2001-04-27 2003-10-16 Genoptix, Inc. Early detection of apoptotic events and apoptosis using optophoretic analysis
US8926838B2 (en) * 2007-02-09 2015-01-06 Environmental Stewardship Solutions Method for recovering suspended solids from residual effluents
GB2461874B (en) * 2008-07-14 2012-11-21 Caltec Ltd Separation system and method

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3557956A (en) * 1970-01-28 1971-01-26 Bergstrom Paper Co Method for de-inking and removal of certain contaminants from reclaimed paper stock
DE2738782C2 (de) * 1977-08-27 1979-07-12 J.M. Voith Gmbh, 7920 Heidenheim Flotationsvorrichtung zum Entfernen von Druckerschwärze
US4094783A (en) * 1977-09-29 1978-06-13 Jackson George F Centrifugal flotation separator
US4399027A (en) * 1979-11-15 1983-08-16 University Of Utah Research Foundation Flotation apparatus and method for achieving flotation in a centrifugal field
US4378289A (en) * 1981-01-07 1983-03-29 Hunter A Bruce Method and apparatus for centrifugal separation
US4414112A (en) * 1982-01-29 1983-11-08 Recovery Technology Associates Oil/water separator
CH658481A5 (de) * 1983-02-18 1986-11-14 Escher Wyss Gmbh Flotationsvorrichtung zum flotieren von aus altpapier gewonnener faserstoffsuspension.
BR8407009A (pt) * 1983-08-11 1985-07-02 Noel Carroll Processo e aparelho para separar liquidos
AT387407B (de) * 1984-01-09 1989-01-25 Escher Wyss Gmbh Flotationsvorrichtung zum flotieren von aus altpapier gewonnener faserstoffsuspension
FR2579638B1 (fr) * 1985-03-29 1988-09-02 Lamort E & M Appareil de desencrage de pate a papier
JPS6417726A (en) * 1987-07-11 1989-01-20 Canon Kk Image reader
CA1328629C (fr) * 1987-09-05 1994-04-19 Peter Gregory Michaluk Separateur
SU1558493A1 (ru) * 1987-12-18 1990-04-23 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Микробиологических Производств Флотационный аппарат
US4876016A (en) * 1988-06-27 1989-10-24 Amoco Corporation Method of controlling the separation efficiency of a hydrocyclone
US5028318A (en) * 1989-04-19 1991-07-02 Aeroquip Corporation Cyclonic system for separating debris particles from fluids
US4997549A (en) * 1989-09-19 1991-03-05 Advanced Processing Technologies, Inc. Air-sparged hydrocyclone separator
US5224604A (en) * 1990-04-11 1993-07-06 Hydro Processing & Mining Ltd. Apparatus and method for separation of wet and dry particles
DE4017446C2 (de) * 1990-05-30 1995-02-23 Escher Wyss Gmbh Flotations-Deinking-Vorrichtung
US5236090A (en) * 1990-05-30 1993-08-17 Sulzer-Escher Wyss Gmbh Flotation-deinking-device
US5069751A (en) * 1990-08-09 1991-12-03 Kamyr, Inc. Hydrocyclone deinking of paper during recycling
EP0618012B1 (fr) * 1993-04-02 1996-09-18 J.M. Voith GmbH Dispositif de flottation

Also Published As

Publication number Publication date
DE4330635C2 (de) 1996-07-11
DE4330635A1 (de) 1995-03-16
EP0642833A1 (fr) 1995-03-15
US5916446A (en) 1999-06-29
US5690812A (en) 1997-11-25

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