EP1050342B1 - Procédé pour éliminer des impuretés d'une suspension aqueuse de fibres à papier - Google Patents

Procédé pour éliminer des impuretés d'une suspension aqueuse de fibres à papier Download PDF

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Publication number
EP1050342B1
EP1050342B1 EP00107633A EP00107633A EP1050342B1 EP 1050342 B1 EP1050342 B1 EP 1050342B1 EP 00107633 A EP00107633 A EP 00107633A EP 00107633 A EP00107633 A EP 00107633A EP 1050342 B1 EP1050342 B1 EP 1050342B1
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EP
European Patent Office
Prior art keywords
flotation
downstream
stage
flotation step
suspension
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
EP00107633A
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German (de)
English (en)
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EP1050342A1 (fr
Inventor
Herbert Holik
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 Patent GmbH
Original Assignee
Voith Paper Patent GmbH
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Filing date
Publication date
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    • 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
    • B03D1/02—Froth-flotation processes
    • 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
    • B03D1/1406—Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
    • 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
    • B03D1/1462—Discharge mechanisms for the froth
    • 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
    • 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

Definitions

  • the invention relates to a method for removing contaminants from an aqueous paper fiber suspension according to the preamble of claim 1.
  • Processes of the type mentioned are used to separate out of a paper fiber suspension at least part of the unwanted solid particles suspended therein, so-called impurities.
  • impurities As is known, in a flotation, a foam or scum containing the substances to be excreted is formed.
  • a typical application of such a method is the treatment of an aqueous fiber suspension obtained from printed waste paper in which the ink particles are already detached from fibers, so that they can be floated.
  • the flotation process described here exploits the differences between papermaking pulp and unwanted particulate matter such that the pulp remains in the fiber suspension due to its rather hydrophilic nature, while the particulate matter in question is hydrophobic and therefore enters the foam together with the air bubbles.
  • ink particles there are also a variety of other substances that are hydrophobic and therefore can be separated by flotation of the pulp.
  • Such substances are in particular adhesives, fine plastic particles and possibly also resins. Since the flotation process mentioned here separates fibers from impurities, this is called selective flotation.
  • the term "flotation deinking”, which is also used, is generally used not only for the removal of ink particles (ink), but also more generally for the selective flotation of impurities from pulp suspensions.
  • JP 60134090 A shows a combination of a flotation cyclone with a subsequently connected separating vessel (secondary process vessel).
  • the flotation foam of the flotation cyclone is passed to the second container for aftertreatment.
  • the invention is therefore based on the object to provide a flotation, with which the spectrum of floated impurity particles is large, without too high equipment and operational effort is needed. In special versions should also be done a venting of the suspension.
  • the inventive method has the advantage that a wide range of sizes in the flotation can be detected by - as known per se - at least two optimized to a respective specific size range sub-steps are connected in series.
  • the second part of the step without further ventilation of the suspension is carried out, which significantly reduces the cost of equipment, energy and process control.
  • the air content in the accept of the upstream flotation step is utilized for further flotation.
  • the downstream flotation step is carried out in a stronger force field, e.g. that of a flotation cyclone.
  • Such apparatus can be particularly effective with the help of small bubbles relatively fine impurities precipitate.
  • Another advantage of the method is that only the residual air that is still present and often undesirable in the accept of the upstream flotation step must be removed by the downstream flotation step so that a low air content suspension is formed. This affects e.g. during operation of subsequent disc filter for thickening of the suspension from low.
  • Fig. 1 shows a very simple scheme with an upstream flotation step 1 and a downstream flotation step 2.
  • the pulp suspension S before being fed to the upstream flotation step 1, is mixed with air L in a mixer 3 so that air bubbles of the desired size and number arise.
  • the processes of the flotation step 1 are known; a flotation foam R1 is formed, which contains a large part of the impurities, and an accept A1, which is formed by the purified pulp suspension. This is fed without further ventilation via the pump 5 to the downstream flotation step 2. While in the example shown here the upstream flotation step 1 is operated solely in the earth's gravity field, a centrifugal field is generated in the downstream flotation step 2 by rotation of the suspension.
  • the upstream flotation step 1 consists of a plurality of flotation devices connected in series. Such a circuit is common in many cases and includes, for example, five to eight flotation processes connected in series.
  • the accept before it comes from the previous in the next flotation, promoted by a pump and mixed again with air.
  • the accept A1 originating from this upstream flotation step 1 passes into a flotation cyclone which performs the downstream flotation step 2.
  • the flotation foam R2 is taken from the same side on the axial side, on which the accept A1 is also introduced into the flotation cyclone. According to the invention, there is no re-ventilation.
  • the accept A2 originating from this flotation step is drawn off at the axially opposite end, either tangentially or axially (dashed arrow).
  • FIG. 3 shows the flotation devices which can be used for the flotation steps in somewhat more detail.
  • the gravitational effect flotation cell (flotation step 1) has an oval shape and forms a substantially closed housing. As a result, the air L escaping the flotation foam R1 can be sucked in again inside the flotation vessel.
  • the mixer 3 'for air L and pulp suspension S is part of a mixing tube, which dips into the suspension. Of course, another ventilation may be provided.
  • the downstream flotation step 2 is carried out in a cylinder 6 in which the inflowing suspension, that is to say the accept A1, of the first flotation step is pumped in without further aeration and is pumped e.g. is set in rotation by a tangential inlet.
  • Both the flotation foam R2 and the accept A2 are here withdrawn at the opposite end of the cylinder 6 in the axial direction of the inlet.
  • Another solution in this regard is shown in FIG. 2.
  • a throttling of the accepts A2 by means of an adjustable throttle valve 7 can be made.
  • both flotation foams R1 and R2 are brought together again, which is already advantageous because then also the air exiting from the flotation foam R2 can get into the mixer 3 '.
  • a special gas can also be used.
  • FIG. 4 shows in plan view that the apparatus used for the downstream flotation step 2 is a cylinder 6.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)

Claims (9)

  1. Procédé destiné à l'élimination d'impuretés d'une suspension aqueuse de matières fibreuses (S) à l'aide de plusieurs phases de flottation (1, 2) sélectives, desquelles une phase de flottation amont (1) fonctionne avec un champ de forces plus faible que la phase de flottation directement aval (2), et
    avec lesquelles la pâte à papier acceptée (A1) de la phase de flottation amont (1) est amenée à la phase de flottation aval (2),
    caractérisé en ce que
    la phase de flottation aval (2) fonctionne à l'aide de l'air résiduel contenu dans la pâte à papier acceptée (A1) de la phase de flottation amont (1), et sans autre ajout d'air.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la phase de flottation aval (2) est effectuée dans un cyclone de flottation.
  3. Procédé selon la revendication 2,
    caractérisé en ce que
    l'accélération centrifuge est réglée dans l'hydrocylone à des valeurs comprises entre cinq et 200 fois l'accélération terrestre.
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    l'accélération centrifuge est réglée dans l'hydrocylone à des valeurs comprises entre dix et 100 fois l'accélération terrestre.
  5. Procédé selon la revendication 1,
    caractérisé en ce que
    la pâte à papier acceptée (A1) pour la phase de flottation aval (2) est introduite de façon tangentielle dans un cylindre (6).
  6. Procédé selon la revendication 2, 3, 4 ou 5,
    caractérisé en ce que
    aussi bien la mousse de flottation (R2) engendrée dans la phase de flottation aval (2) que la pâte à papier acceptée (A2), sont évacuées du côté opposé axialement à l'entrée du dispositif de flottation utilisé dans la phase de flottation aval (2).
  7. Procédé selon la revendication 2, 3, 4, 5 ou 6,
    caractérisé en ce que
    la mousse de flottation (R2) engendrée dans la phase de flottation aval (2) est évacuée axialement du dispositif de flottation utilisé au niveau du côté auquel se trouve également l'entrée, et en ce que la pâte à papier acceptée (A2) est évacuée du côté axialement opposé.
  8. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    le champ de forces plus faible est le champ de gravitation terrestre.
  9. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la pâte à papier acceptée (A1) de la phase de flottation amont (1) est amenée directement et sans cuve à la phase de flottation aval (2).
EP00107633A 1999-05-04 2000-04-08 Procédé pour éliminer des impuretés d'une suspension aqueuse de fibres à papier Expired - Lifetime EP1050342B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19920480 1999-05-04
DE19920480A DE19920480A1 (de) 1999-05-04 1999-05-04 Verfahren zur Entfernung von Störstoffen aus einer wässrigen Papierfasersuspension

Publications (2)

Publication Number Publication Date
EP1050342A1 EP1050342A1 (fr) 2000-11-08
EP1050342B1 true EP1050342B1 (fr) 2006-06-07

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EP00107633A Expired - Lifetime EP1050342B1 (fr) 1999-05-04 2000-04-08 Procédé pour éliminer des impuretés d'une suspension aqueuse de fibres à papier

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EP (1) EP1050342B1 (fr)
AT (1) ATE328667T1 (fr)
DE (2) DE19920480A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004051327B4 (de) 2004-10-21 2007-09-27 Voith Patent Gmbh Verfahren zur Entgasung und Zuführung einer Faserstoffsuspension zu einem Stoffauflauf sowie Entgasungsvorrichtung
CN101326011B (zh) * 2005-12-07 2013-02-27 太平洋水泥株式会社 飞灰中未燃碳的去除装置及去除方法
GB2464318B (en) * 2008-10-11 2012-08-29 Screens At Work Ltd Improvements in and relating to furniture

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60134090A (ja) * 1983-12-23 1985-07-17 森實　美津夫 パルプの脱墨方法とその装置
DE4206748A1 (de) * 1992-03-04 1993-09-09 Voith Gmbh J M Aufbereitung und verfahren von altpapier
DE4221028A1 (de) * 1992-03-04 1994-01-05 Voith Gmbh J M Aufbereitungsverfahren von Altpapier
DE4224329C1 (de) * 1992-07-23 1993-11-11 Voith Gmbh J M Aufbereitungsverfahren für Altpapier
DE4426159A1 (de) * 1994-07-22 1994-12-08 Voith Gmbh J M Flotationseinrichtung
DE19728393C2 (de) * 1997-07-03 1999-08-05 Voith Sulzer Stoffaufbereitung Verfahren und Anlage zur Entfernung von Störstoffen aus einer wässrigen Faserstoffsuspension

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Publication number Publication date
EP1050342A1 (fr) 2000-11-08
DE50012882D1 (de) 2006-07-20
ATE328667T1 (de) 2006-06-15
DE19920480A1 (de) 2000-11-09

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