EP0642833A1 - 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
EP0642833A1
EP0642833A1 EP94110775A EP94110775A EP0642833A1 EP 0642833 A1 EP0642833 A1 EP 0642833A1 EP 94110775 A EP94110775 A EP 94110775A EP 94110775 A EP94110775 A EP 94110775A EP 0642833 A1 EP0642833 A1 EP 0642833A1
Authority
EP
European Patent Office
Prior art keywords
flotation
suspension
air
flotation device
container
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
EP94110775A
Other languages
German (de)
English (en)
Other versions
EP0642833B1 (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
Escher Wyss GmbH
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 Escher Wyss GmbH, Voith Sulzer Stoffaufbereitung GmbH filed Critical Escher Wyss 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 an apparatus for performing the method.
  • Methods of the type mentioned are used to separate at least a portion of the solid particles suspended therein from a suspension.
  • the objective here can either be the removal of undesirable components of the suspension or the clarification of contaminated wastewater.
  • a foam or floating sludge containing the substances to be separated out is formed during flotation.
  • a typical application for the use of such a method is the preparation of a suspension made of printed waste paper, in which the ink particles have already been detached from the fibers, so that they can be selectively floated out (deinking flotation).
  • a flotation device which can already use the acceleration field caused by the rotational movement of the suspension.
  • the flotation foam is removed from the flotation device through an overhead tube, while the cleaned suspension flows off at the bottom. This means dividing the inflowing flow into axially opposing partial flows.
  • Such current routing is also common with hydrocyclones. It leads to a disproportionate increase in the centrifugal acceleration towards the center of the container in the form of a so-called potential vortex.
  • the invention had for its object to provide a method which, using a centrifugal field, an even better separation of the suspended Solid particles or the use of relatively compact flotation devices, or both.
  • the process according to the invention does not result in a deflection of the foam's transport direction in the flotation space. This specifically prevents the formation of a potential vortex.
  • Fig. 1 shows with dashed lines a clarification room 1, into which the suspension 2 is fed.
  • the suspension then performs a rotational movement, indicated by the arrow 3 about the axis 5.
  • a further movement, represented by the arrows 4, is superimposed on the rotational movement 3, which movement is essentially parallel run to the axis of rotation 5.
  • the flotated substances rise together with air bubbles against the effect of a gravitational field. Since the gravitational field arises as a centrifugal field as a result of the rotational movement 3, the floated parts move radially inwards.
  • the flotation foam thus accumulates in the radially inner region of the clarification chamber 1, a more or less sharp boundary 8 being formed between the flotation foam and the air escaping therefrom.
  • the method is carried out in such a way that the floated portions are transported essentially parallel to the axis of rotation 5 and in the same direction as that of the superimposed movement 4 (arrows 6).
  • the floated parts collected in this way are discharged from the clarification chamber 1, indicated here by the arrows 7, usually together with free air which has escaped from the suspension foam, arrow 10.
  • the part of the suspension from which the floated parts are removed emerges from the clarification room, arrow 11.
  • Air required for flotation is either added to the substance 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 container 12 with which the method can be carried out.
  • An inlet 13 and an outlet 14 (shown offset here) and the sludge pipe 15 can be seen.
  • a turbulence generating device 17 can be present in the inlet 13, here designed as a step diffuser, into which air is pumped in by an air line 16 in the vicinity of the step jump is sucked in.
  • a plurality of step diffusers are provided one above the other in the vertical direction and only one in the radial direction. Turbulence generation with the aid of step diffusers, even when entering flotation apparatus, is known per se, but offers particular advantages in connection with the other features of the method according to the invention. This is related to the task of achieving the best possible flotation effect in the smallest possible space. Controlled micro-vortices and a force field increased by rotation are therefore 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 does not show a cylindrical but a slightly conical flotation container 12 '.
  • a measure allows the rotational movement to be accelerated without supplying any further energy, as a result of which friction losses could be compensated for.
  • the total volume of the suspension will be lower due to air flowing out into the center of the flotation container.
  • a further variation possibility not necessarily tied to the conical shape of the flotation container, is the ventilation of the suspension during the flotation through an air box 18 to which an air connection 19 is attached. In such a case, of course, suitable steps must be taken to allow the air to enter the suspension in the region of the wall 20, e.g. through porous or perforated designs.
  • FIG. 5 shows part of a further flotation device suitable for carrying out the method, namely the area of the sludge pipe 15 '.
  • This is designed as a concentric double tube, so that two different fractions of material accumulated in the central part of the flotation container can be drawn off. It can be particularly advantageous to separate a foam fraction 21 that is as concentrated as possible separately from a foam / suspension mixed fraction 22. A further separation step could then be obtained from the latter, 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)
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 true EP0642833A1 (fr) 1995-03-15
EP0642833B1 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

Country Status (3)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0873194A1 (fr) * 1995-11-14 1998-10-28 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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CA2677666C (fr) * 2007-02-09 2015-12-15 Environmental Stewardship Solutions, Llc. Procede de recuperation de matieres solides en suspension d'effluents residuels
GB2461874B (en) * 2008-07-14 2012-11-21 Caltec Ltd Separation system and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541136A1 (fr) * 1983-02-18 1984-08-24 Escher Wyss Gmbh Dispositif de flottation d'une suspension fibreuse obtenue a partir de vieux papier
WO1985000760A1 (fr) * 1983-08-11 1985-02-28 Noel Carroll Procede et appareil de separation de liquide
EP0198737A1 (fr) * 1985-03-29 1986-10-22 E. + M. Lamort Société Anonyme dite: Appareil de décontamination de pâte à papier
WO1991015302A1 (fr) * 1990-04-11 1991-10-17 Hydro Processing & Mining Ltd. Dispositif et procede de separation de particules humides et seches

Family Cites Families (17)

* 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
AT387407B (de) * 1984-01-09 1989-01-25 Escher Wyss Gmbh Flotationsvorrichtung zum flotieren von aus altpapier gewonnener faserstoffsuspension
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
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541136A1 (fr) * 1983-02-18 1984-08-24 Escher Wyss Gmbh Dispositif de flottation d'une suspension fibreuse obtenue a partir de vieux papier
WO1985000760A1 (fr) * 1983-08-11 1985-02-28 Noel Carroll Procede et appareil de separation de liquide
EP0198737A1 (fr) * 1985-03-29 1986-10-22 E. + M. Lamort Société Anonyme dite: Appareil de décontamination de pâte à papier
WO1991015302A1 (fr) * 1990-04-11 1991-10-17 Hydro Processing & Mining Ltd. Dispositif et procede de separation de particules humides et seches

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0873194A1 (fr) * 1995-11-14 1998-10-28 Automatic Control Technology, Inc. Systeme de cyclone pour separer des particules d'un flux de liquide
EP0873194A4 (fr) * 1995-11-14 1999-09-29 Automatic Control Technology I 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

Also Published As

Publication number Publication date
DE4330635C2 (de) 1996-07-11
US5690812A (en) 1997-11-25
US5916446A (en) 1999-06-29
DE4330635A1 (de) 1995-03-16
EP0642833B1 (fr) 1998-09-30

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