EP1050342A1 - 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
EP1050342A1
EP1050342A1 EP00107633A EP00107633A EP1050342A1 EP 1050342 A1 EP1050342 A1 EP 1050342A1 EP 00107633 A EP00107633 A EP 00107633A EP 00107633 A EP00107633 A EP 00107633A EP 1050342 A1 EP1050342 A1 EP 1050342A1
Authority
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.)
Granted
Application number
EP00107633A
Other languages
German (de)
English (en)
Other versions
EP1050342B1 (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
Voith Sulzer Papiertechnik Patent 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 Paper Patent GmbH, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1050342A1 publication Critical patent/EP1050342A1/fr
Application granted granted Critical
Publication of EP1050342B1 publication Critical patent/EP1050342B1/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
    • B03D1/1418—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 a aqueous paper fiber suspension according to the preamble of claim 1.
  • JP 60134090 A shows a combination of a flotation cyclone with one downstream separation tank (secondary process tank). Doing so the flotation foam of the flotation cyclone for after-treatment in the second container guided.
  • the invention is therefore based on the object of creating a flotation process with which the spectrum of contaminated contaminant particles is large, without a too high equipment and operational expenditure is required.
  • the suspension should also be vented.
  • the inventive method has the advantage that a wide range of sizes the flotation can be recorded by - as is known per se - at least two on one each particular size range optimized sub-steps connected in series become.
  • the second step is without further aeration of the suspension executed what the expenditure of equipment, energy and process control essential reduced.
  • the air content in the accepted material of the upstream flotation section is used for further flotation. It is particularly advantageous that the downstream flotation step in a stronger force field, e.g. that one Flotation cyclones.
  • Such devices can be particularly effective with Separate relatively fine contaminants with the help of small air bubbles.
  • Another advantage of the process is that only the residual air in the accept of the upstream flotation step is still present and is often undesirable, must be removed by the downstream flotation step so that a Suspension with low air content is formed. This affects e.g. during operation subsequent disc filter for thickening the suspension favorably.
  • FIG. 1 shows a very simple diagram with an upstream flotation step 1 and a downstream flotation step 2.
  • the pulp suspension S is before it is fed to the upstream flotation step 1 in a mixing element 3 mixed with air L so that air bubbles of the desired size and number are created.
  • the processes of flotation step 1 are known; it becomes a flotation foam R1 formed, which contains a large part of the contaminants, as well as an acceptor A1, which from the cleaned pulp suspension is formed. This will be without further ventilation fed to the downstream flotation step 2 via the pump 5. While at that example shown here the upstream flotation section 1 alone in the Earth's gravity field is operated in the downstream flotation step 2 by Rotation of the suspension creates a centrifugal field.
  • the method shown schematically in FIG. 2 differs in some points of that in Fig. 1 and shows another way to implement the invention.
  • the upstream flotation step 1 consists of several one after the other switched flotation devices. Such a circuit is common in many cases and includes e.g. five to eight flotation processes connected in series. The Gutstoff, before it comes from the previous to the next flotation, via a pump promoted and mixed again with air.
  • the one from this upstream Acceptable substance A1 originating from flotation step 1 arrives in a flotation cyclone, which performs the downstream flotation step 2.
  • the flotation foam R2 is taken from the same side, seen axially, at which the accepting substance A1 is also introduced into the flotation cyclone. According to the invention there is no renewed ventilation.
  • the one from this flotation step Acceptable material A2 is drawn off at the axially opposite end, either tangentially or axial (dashed arrow).
  • the under gravity standing flotation cell (flotation step 1) has an oval shape and forms an im essentially closed housing. This allows the flotation foam R1 escaping air L can be sucked in again within the flotation vessel.
  • the Mixer 3 'for air L and fiber suspension S is part of a mixing tube which in the suspension is immersed. Of course, other ventilation can also be used be provided.
  • the downstream flotation step 2 takes place in a cylinder 6 carried out, in which the inflowing suspension, ie the accept A1, of the first Pumped in flotation step without further aeration and e.g. through a Tangential inlet is set in rotation.
  • Fig. 4 shows in supervision that it is for the downstream Flotation step 2 used apparatus is a cylinder 6. You can see that tangential feed for the accept substance A1 of the upstream flotation step (1) and the tangential exit for the good substance A2.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
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 true EP1050342A1 (fr) 2000-11-08
EP1050342B1 EP1050342B1 (fr) 2006-06-07

Family

ID=7906920

Family Applications (1)

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

Country Status (3)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006045378A1 (fr) * 2004-10-21 2006-05-04 Voith Patent Gmbh Procede de degazage et d'acheminement d'une suspension de materiau fibreux vers un ecoulement de materiau ou un dispositif de filtrage et dispositif de degazage
EP1958697A1 (fr) * 2005-12-07 2008-08-20 Taiheiyo Cement Corporation Appareil destine a l elimination de carbone non brule de cendres volantes et procede d elimination associe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2464318B (en) * 2008-10-11 2012-08-29 Screens At Work Ltd Improvements in and relating to furniture

Citations (3)

* 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
DE4426159A1 (de) * 1994-07-22 1994-12-08 Voith Gmbh J M Flotationseinrichtung
EP0888819A1 (fr) * 1997-07-03 1999-01-07 Voith Sulzer Papiertechnik Patent GmbH Procédé et installation pour l'enlèvement des impuretés d'une suspension aqueuse de matières

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221028A1 (de) * 1992-03-04 1994-01-05 Voith Gmbh J M Aufbereitungsverfahren von Altpapier
DE4206748A1 (de) * 1992-03-04 1993-09-09 Voith Gmbh J M Aufbereitung und verfahren von altpapier
DE4224329C1 (de) * 1992-07-23 1993-11-11 Voith Gmbh J M Aufbereitungsverfahren für Altpapier

Patent Citations (3)

* 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
DE4426159A1 (de) * 1994-07-22 1994-12-08 Voith Gmbh J M Flotationseinrichtung
EP0888819A1 (fr) * 1997-07-03 1999-01-07 Voith Sulzer Papiertechnik Patent GmbH Procédé et installation pour l'enlèvement des impuretés d'une suspension aqueuse de matières

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8540, Derwent World Patents Index; Class F09, AN 1985-245072 [25], XP002041309 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006045378A1 (fr) * 2004-10-21 2006-05-04 Voith Patent Gmbh Procede de degazage et d'acheminement d'une suspension de materiau fibreux vers un ecoulement de materiau ou un dispositif de filtrage et dispositif de degazage
US7807020B2 (en) 2004-10-21 2010-10-05 Voith Patent Gmbh Method for degassing and supplying a fibrous suspension to a headbox or a filter device and degassing device
US8025761B2 (en) 2004-10-21 2011-09-27 Voith Patent Gmbh Method for degassing and supplying a fibrous suspension to a headbox or a filter device and degassing device
US8025772B2 (en) 2004-10-21 2011-09-27 Voith Patent Gmbh Method for degassing and supplying a fibrous suspension to a headbox or a filter device and degassing device
EP1958697A1 (fr) * 2005-12-07 2008-08-20 Taiheiyo Cement Corporation Appareil destine a l elimination de carbone non brule de cendres volantes et procede d elimination associe
EP1958697A4 (fr) * 2005-12-07 2013-06-26 Taiheiyo Cement Corp Appareil destine a l elimination de carbone non brule de cendres volantes et procede d elimination associe

Also Published As

Publication number Publication date
EP1050342B1 (fr) 2006-06-07
ATE328667T1 (de) 2006-06-15
DE19920480A1 (de) 2000-11-09
DE50012882D1 (de) 2006-07-20

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