US20040222161A1 - Process and device for aerating suspensions - Google Patents

Process and device for aerating suspensions Download PDF

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Publication number
US20040222161A1
US20040222161A1 US10/761,866 US76186604A US2004222161A1 US 20040222161 A1 US20040222161 A1 US 20040222161A1 US 76186604 A US76186604 A US 76186604A US 2004222161 A1 US2004222161 A1 US 2004222161A1
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United States
Prior art keywords
cells
washing
plant
suspension
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.)
Abandoned
Application number
US10/761,866
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English (en)
Inventor
Helmuth Gabl
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.)
Andritz AG
Original Assignee
Andritz AG
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Filing date
Publication date
Application filed by Andritz AG filed Critical Andritz AG
Assigned to ANDRITZ AG reassignment ANDRITZ AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GABL, HELMUTH
Publication of US20040222161A1 publication Critical patent/US20040222161A1/en
Priority to US12/152,305 priority Critical patent/US8118171B2/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • D21B1/325—Defibrating by other means of waste paper de-inking devices
    • D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
    • 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
    • B03D1/1468—Discharge mechanisms for the sediments
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • 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
    • B03D1/1431—Dissolved air flotation machines
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the invention relates to a process for aerating suspensions, particularly to flotate them, for example in deinking of pulp suspensions, with one or more stages and/or cells, where each stage/cell has its own separate liquid loop.
  • the invention relates to a device for implementing the process.
  • a process of this type is known, for example, from EP 1 124 001 A2, where the individual flotation stages can also be designed according to U.S. Pat. No. 4,255,262, EP 0 243 690, DE 31 20 202, or U.S. Pat. No. 6,208,549, for example.
  • Processes of this type are used to remove impurities and printing ink particles from pulp suspensions, particularly those produced in waste paper treatment.
  • non-specific removal of mineral components e.g., fillers containing ash, etc.
  • their chemical surface properties particularly loading
  • the specific weight of the mineral components is approximately two to three times higher than that of the ink particles.
  • the aim of the invention is to reduce or avoid the above disadvantages, while maintaining the same flow path and aeration gas loading.
  • the invention may broadly be considered as a process for deinking a pulp suspension by passing the suspension through a series of flotation cells to remove impurities, wherein the improvement comprises diverting at least a portion of the suspension from a cell, washing impurities from the diverted suspension, and returning the washed suspension to a cell.
  • the invention is thus characterised by a washing process being interposed into the flotation process, where the washing process can be interposed in the liquid loop of one cell, for example a primary or secondary cell, or between the cell stages, i.e., between primary and secondary cells.
  • the washing process can be interposed in the liquid loop of one cell, for example a primary or secondary cell, or between the cell stages, i.e., between primary and secondary cells.
  • the invention can considered as a process for removing particulate impurities from a feed flow suspension of recoverable solids by passing the feed as an impure fluid flow through a flotation stage, collecting and discharging the flotated impurities through an overflow line, and discharging the purified suspension through an accepts line, wherein each flotation cell has an internal flow loop for processing a portion of the impure fluid flow before discharge from the stage or cell, and wherein the improvement comprises removing some of the impurities by washing at least a portion of the impure fluid flow.
  • the flotation efficiency can be increased.
  • the accept from the entire process has an ash content of less than approximately 20%, preferably below 15%, at an ingoing filler content of approximately 23% and more. As a result, the accept can be returned to the process again with low fibre loss.
  • the invention relates to a device for aerating suspensions, particularly to flotate them, for example in deinking of pulp suspensions, with one or more stages and/or cells, where each stage/cell has its own separate liquid loop.
  • this device is characterised by a washer being interposed in the series of flotation cells, where the washer can be interposed into the liquid loop of a cell, for example a primary or secondary cell and/or between the cell stages, i.e., between primary and secondary cells.
  • the invention can be considered as an aeration plant having a suspension feed inlet, means for removing particulate impurities from a feed suspension of recoverable solids by passing the feed as an impure fluid flow through at least one impurities flotation stage, means for collecting and discharging the flotated impurities through an overflow line, and means for discharging the purified suspension through an accepts line, wherein the improvement further comprises a washer for removing some of the impurities in at least a portion of the impure fluid flow.
  • the invention is preferably in the form of an aeration plant having a suspension feed inlet, means for removing particulate impurities from a feed flow suspension of recoverable solids by passing the feed as an impure fluid flow through an impurities flotation stage having a plurality of flotation cells, means for collecting and discharging the flotated impurities through an overflow line, and means for discharging the purified suspension through an accepts line, wherein at least one cell has an internal flow loop for mixing air from an air line with a portion of the impure fluid flow in a liquid line, for aeration injection into the same cell, and wherein the improvement further comprises a washer situated in the internal flow loop, for removing some of the impurities in at least a portion of the impure fluid flow in said loop.
  • a further reduction in the fibre losses while diminishing the volume flows from the flotation washing system can be achieved by post-washing of the reject flows collected.
  • a favourable configuration results if the washer or washers is/are designed as rotation washers with vertical rotor axis or, alternatively, as roll washers.
  • FIG. 1 shows a state-of-the art flotation plant
  • FIG. 2 shows a first variant of the invention
  • FIG. 3 shows a second variant of the invention
  • FIG. 4 shows a particularly favourable third variant of the invention
  • FIG. 5 shows a first variant of a washer for implementing the invention
  • FIG. 6 shows a second variant of a washer for implementing the invention
  • FIG. 7 represents a mass balance according to the state of the art.
  • FIG. 8 represents a mass balance according to the variant of the invention shown in FIG. 3.
  • FIG. 1 is a schematic diagram of a flotation plant according to the state of the art having a primary stage with four primary cells, P 1 , P 2 , P 3 and P 4 , and a secondary stage with two secondary cells, S 1 and S 2 .
  • the flow of pulp suspension Z is brought into the first primary cell P 1 at a suitable point.
  • the aeration bubbles are generated inside this cell via internal loop 1 , which is disconnected from the feed, by the injector 2 drawing in suspension from the bottom of the cell in a liquid line and air from an air line Land mixing it for injection into the suspension in the same cell.
  • the entire flotation plant is largely filled with suspension, on the surface O of which a foam forms which contains as much as possible of the mineral substances and ink particles to be removed by flotation.
  • the accept flow cleaned in primary cell P 1 to remove ink and impurities is transferred to the second primary cell P 2 through an opening 5 located at the base of the dividing wall 10 .
  • the suspension is treated in the same way, with bubble generating injectors which are operated by internal cell loops, and is discharged at the end of the plant as accept G.
  • the foam collected from all primary cells P 1 to P 4 can drain off down a foam channel 3 into a tank 4 .
  • the overflow from this intermediate tank 4 from which the foam has largely been removed in the meantime, is fed to the secondary cell S 2 .
  • Gas loading takes place here again round the internal cell loop 6 .
  • the accept from the secondary cell S 2 to the secondary cell S 1 is transferred through the opening 7 located at the base.
  • the foam from the secondary cells can be removed as overflow F.
  • the accept from the secondary cell S 1 enters the first primary cell P 1 through the opening 9 in the dividing wall 11 located at the base.
  • the washing stage according to the invention can be interposed at several points. It can be inserted in the internal loop of a primary cell or a secondary cell, or between the primary and secondary stages.
  • FIG. 2 shows the washing stage interposed in a primary stage and a secondary stage.
  • the washer 12 is installed at one of the primary cells (P 1 , P 2 , P 3 , P 4 ), depending on the desired process control and cleanness requirements.
  • one washer 12 ′ can be interposed in the loop of a secondary cell (S 1 , S 2 ).
  • FIG. 2 shows a washer 12 at P 2 and a washer 12 ′ at S 2 .
  • the washer 12 , 12 ′ is installed downstream of an injector pump 13 . Compared with the state of the art, in the invention the injector pump 13 provides a higher pressure output at the same throughput.
  • a part flow of the liquid from which the ash is to be removed is drawn off near the base of the cell P 2 , S 2 before the cell content drains into the next cell and enters the same cell after the ash has been removed in the washer 12 , 12 ′ and the pulp consistency set by means of the diffuser 14 , 14 .
  • the fillers (mainly ash) and fines removed in the washer 12 , 12 ′ are brought to a sewage treatment plant.
  • the degree of ash removal can be set with the usual machine parameters.
  • the ash can also be removed from the entire flow between the cells.
  • the loop In order to retain the flotation efficiency, the loop must be opened and the pulp consistency further diluted, preferably to approximately 0.8 to 1.3%.
  • FIG. 3 the feed 15 to the secondary cell is treated in a washer 16 , acting as ash removal device, such that the hydraulic load in the secondary cells is reduced due to removal of ash and fines.
  • the fundamental aspect here is targeted removal of ash.
  • the mass balances of this configuration are shown in FIG. 7 for state of the art and in FIG. 8 for the present invention.
  • the variant of FIG. 3 shows the most effective form of partial flow washing because the foam is already enriched considerably with mineral substances during the flotation process.
  • FIG. 4 A further potential means of removing the ash is shown in FIG. 4.
  • the ash is removed in two partial flows.
  • the ash removal units 17 , 17 ′ are cascaded.
  • the accept, now depleted of filler and coming from the next washer 18 is brought to the flotation foam tank 4 and undergoes further flotation together with the overflow foam from the primary cells to the secondary cells.
  • the reject which contains a high concentration of fillers and fines, is disposed of in a DAF (Dissolved Air Flotation) unit or a sludge press.
  • DAF Dissolved Air Flotation
  • FIG. 5 shows a potential variant of an ash removal device in the form of a rotation washer 20 .
  • the suspension is fed to the top of washer 20 through the feed branch 21 .
  • a stationary fitting 22 deflects the suspension flow downward with favourable flow characteristics to the inner part of the cylindrical screen basket 23 .
  • In this area there is a rotor 24 , which has an upstream parabolic shape and downstream foils 25 extending radially outward toward basket 23 .
  • the accept passing through the screen 23 is collected in an accept area 26 and discharged through the accept outlet 27 .
  • the rotor 24 is driven by drive 28 .
  • This type of unit has low energy consumption, achieved by the favourable flow path, particularly the parabolic rotor.
  • a high level of ash removal can be obtained by optimising screens and foil designs.
  • FIG. 6 shows an alternative configuration of a washer as a roll washer 30.
  • the suspension is fed through a so-called headbox 31 , through which the suspension is injected between the roll 32 and a screen 33 .
  • the screen 33 is driven by a drive roll 34 and the filtrate, which is the accept, exits through the filtrate discharge 35 .
  • FIG. 7 shows the pulp flows in a state-of-the-art flotation plant 40 .
  • the flotation plant shown here comprises primary cells 41 and secondary cells 42 .
  • the suspension feed 43 is fed to the primary cells 41 , from where the overflow 44 is brought to the secondary cells 42 .
  • the accept 45 is carried away from the primary cells 41 , while the overflow 46 with the concentrated solids is taken from the secondary cells 42 .
  • At some points in the system more shower water 47 is added.
  • Table 1 TABLE 1 Volume flow, Solids rel. ash content in Flow No.
  • FIG. 8 shows the pulp flows from a flotation plant 40 according to FIG. 3, with primary cells 41 and secondary cells 42 .
  • the suspension feed 43 is fed to the primary cells 41 , from where the overflow 44 , is brought to the ash removal device, specifically to the washer 48 .
  • the “accept” 49 from the washer 48 is reduced to a consistency of less than 1% by adding dilution water 52 and fed to the secondary cells 42 at 53 .
  • the flow with a high filler load 50 coming from the washer is mixed with the overflow 46 from the secondary cells 42 and discharged from the system as total overflow 51 .
  • the values of the individual pulp flows can be found in the following Table 2.
  • the flow in 43 , 41 , 44 , 53 , and 42 can be defined as an impure fluid flow, and thus the invention includes locating the washing device 48 and associated wash return 49 not only in the secondary return line 53 , but at any location in the impure fluid flow, e.g., 41 , 44 , 53 , and/or 42 .

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Physical Water Treatments (AREA)
US10/761,866 2003-01-24 2004-01-21 Process and device for aerating suspensions Abandoned US20040222161A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/152,305 US8118171B2 (en) 2003-01-24 2008-05-14 Process and device for aerating suspensions

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA89/2003 2003-01-24
AT0008903A AT412216B (de) 2003-01-24 2003-01-24 Verfahren und vorrichtung zur belüftung von suspensionen

Related Child Applications (1)

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US12/152,305 Division US8118171B2 (en) 2003-01-24 2008-05-14 Process and device for aerating suspensions

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US20040222161A1 true US20040222161A1 (en) 2004-11-11

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US10/761,866 Abandoned US20040222161A1 (en) 2003-01-24 2004-01-21 Process and device for aerating suspensions
US12/152,305 Expired - Fee Related US8118171B2 (en) 2003-01-24 2008-05-14 Process and device for aerating suspensions

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Country Status (8)

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US (2) US20040222161A1 (pt)
EP (2) EP1441064A1 (pt)
CN (1) CN100365200C (pt)
AT (2) AT412216B (pt)
BR (1) BRPI0400119A (pt)
CA (1) CA2454737A1 (pt)
MX (1) MXPA04000701A (pt)
NO (1) NO20040310L (pt)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009045965A1 (de) * 2009-10-23 2011-04-28 Voith Patent Gmbh Verfahren zur Entfernung von Feststoffen aus einer Faserstoffsuspension durch Flotation
DE102015201996A1 (de) * 2015-02-05 2016-08-11 Voith Patent Gmbh Faserstoffbehandlung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215447A (en) * 1977-09-28 1980-08-05 Gartland Jean G Process and apparatus for washing fibre stock in the de-inking of paper
US5417806A (en) * 1991-10-19 1995-05-23 Sulzer-Escher Wyss Gmbh Method of removing fine contaminants from used paper fibre material
US6475337B2 (en) * 2000-02-03 2002-11-05 Andritz Ag Process for aerating dispersions

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2610581B1 (de) * 1976-03-13 1977-08-11 Voith Gmbh J M Verfahren und vorrichtung zur gewinnung von relativreinen faserstoffsuspensionen bei der aufarbeitung von altpapier
DE2836186C2 (de) 1978-08-18 1980-02-07 J.M. Voith Gmbh, 7920 Heidenheim Verfahren und Vorrichtung zur Entaschung von Faserstoffsuspensionen bei der Altpapieraufbereitung
US4255262A (en) 1979-03-26 1981-03-10 U.S. Filter Corporation Hydraulic powered mixing apparatus
CH644414A5 (de) * 1980-02-06 1984-07-31 Escher Wyss Gmbh Siebmaschine, insbesondere zur behandlung von aus altpapier gewonnenen waesserigen faserstoffsuspensionen.
DE3120202C2 (de) 1981-05-21 1986-06-26 J.M. Voith Gmbh, 7920 Heidenheim Einrichtung zum Deinken von Altpapier durch Flotation
DE3144561C2 (de) 1981-11-10 1985-05-02 Feldmühle AG, 4000 Düsseldorf Verfahren zum Deinken von Faserstoffsuspensionen
DE3614933C1 (de) 1986-05-02 1987-10-22 Voith Gmbh J M Flotationsbehaelter oder -zelle
US5518580A (en) * 1991-09-20 1996-05-21 J.M. Voith Gmbh Method of processing printed waste matter
JP3526055B2 (ja) * 1992-01-17 2004-05-10 日本製紙株式会社 古紙の脱墨方法
DE4206748A1 (de) * 1992-03-04 1993-09-09 Voith Gmbh J M Aufbereitung und verfahren von altpapier
DE4238336A1 (de) 1992-11-13 1994-05-19 Voith Gmbh J M Reinigung von Altpapiersuspensionen durch Flotation
US6208549B1 (en) 2000-02-24 2001-03-27 Xilinx, Inc. One-time programmable poly-fuse circuit for implementing non-volatile functions in a standard sub 0.35 micron CMOS
AT412288B (de) 2003-02-25 2004-12-27 Andritz Ag Maschf Verfahren und vorrichtung zur belüftung von suspensionen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215447A (en) * 1977-09-28 1980-08-05 Gartland Jean G Process and apparatus for washing fibre stock in the de-inking of paper
US5417806A (en) * 1991-10-19 1995-05-23 Sulzer-Escher Wyss Gmbh Method of removing fine contaminants from used paper fibre material
US6475337B2 (en) * 2000-02-03 2002-11-05 Andritz Ag Process for aerating dispersions

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NO20040310L (no) 2004-07-26
CA2454737A1 (en) 2004-07-24
ATE528439T1 (de) 2011-10-15
EP1441064A1 (de) 2004-07-28
BRPI0400119A (pt) 2005-05-24
US20080296206A1 (en) 2008-12-04
EP1992735B1 (de) 2011-10-12
EP1992735A1 (de) 2008-11-19
MXPA04000701A (es) 2005-06-07
US8118171B2 (en) 2012-02-21
CN1517488A (zh) 2004-08-04
ATA892003A (de) 2004-04-15
CN100365200C (zh) 2008-01-30
AT412216B (de) 2004-11-25

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