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US20060254732A1 - System and method for removing foreign particles from an aqueous fibrous suspension - Google Patents

System and method for removing foreign particles from an aqueous fibrous suspension Download PDF

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Publication number
US20060254732A1
US20060254732A1 US11/431,633 US43163306A US2006254732A1 US 20060254732 A1 US20060254732 A1 US 20060254732A1 US 43163306 A US43163306 A US 43163306A US 2006254732 A1 US2006254732 A1 US 2006254732A1
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Prior art keywords
flotation
fraction
treating
approximately
coarse fraction
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
US11/431,633
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English (en)
Inventor
Juergen Dockal-Baur
Harald Selder
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
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Voith Paper Patent GmbH
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Filing date
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Assigned to VOITH PAPER PATENT GMBH reassignment VOITH PAPER PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DOCKAL-BAUR, JUERGEN, SELDER, HARALD
Publication of US20060254732A1 publication Critical patent/US20060254732A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • 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
    • 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 method for removing foreign particles from an aqueous fibrous suspension and, more particularly, to a method for removing foreign particles in a recovered paper suspension with the aid of several selective flotations.
  • a typical method is the treatment of an aqueous fibrous suspension obtained from printed recovered paper, in which suspension of the printing ink particles are already released from fibers so that they can be floated off.
  • the flotation process utilizes the differences between fibrous paper stock and undesirable solid particles such that the fiber stock remains in the fibrous suspension on account of its rather hydrophilic nature, while the targeted solid particles are hydrophobic and therefore move into the foam together with the air bubbles.
  • undesirable solid particles such that the fiber stock remains in the fibrous suspension on account of its rather hydrophilic nature, while the targeted solid particles are hydrophobic and therefore move into the foam together with the air bubbles.
  • other substances that are hydrophobic and thus can be separated from the fiber stock through flotation.
  • such materials are adhesives, fine synthetic material particles and perhaps also resins.
  • fibers are separated from impurities by “selective flotation.”
  • foulation de-inking which is also used, is normally used for the removal of printing ink particles and more generally for the selective flotation of impurities out of fibrous suspensions.
  • the invention creates a preparation method with which the most effective possible elimination of the foreign particles can be achieved without excessively high expenditure in terms of equipment and operation being required.
  • the method according to the invention has the advantage that the flotations respectively treat only one fraction and can be optimally adapted to the special requirements of these fractions.
  • a method for removing foreign particles from an aqueous fibrous suspension, in particular recovered paper suspension, with the aid of several selective flotations includes a fractioning device to form a fibrous fine fraction and a fibrous coarse fraction.
  • the fine fraction and coarse fraction are treated in separate flotations.
  • the separate flotation features of inflow consistency, overflow quantity, dwell time, chemical type, specific chemical quantity, location of chemical addition, specific quantity of the flotation air added, bubble size, number of flotation cells, type of flotation cell, size of the gravitational field, number of reject-related flotation steps or number of accepted stock-related flotation steps are selected differently, individually or in combination with one another.
  • the method is typically applied to recovered paper suspensions.
  • This starting material contains a mixture of different fibers and impurities.
  • the fine fraction contains larger amounts of the floatable foreign particles together with the short fibers.
  • the flotation conditions are more favorable than in the coarse fraction. That is, the flotation of the fine fraction can yield a good result even, e.g., with higher consistency, while, e.g., the conventional full stream flotation is carried out with a consistency of approximately 1.3%.
  • the fine fraction can be floated at approximately 1.5% and the coarse fraction at approximately 0.9%. In embodiments, a fine adjustment of these consistency values to the conditions and requirements is possible.
  • Other possibilities for influencing the flotation are provided by variations of the chemical metering.
  • a method for removing foreign particles from an aqueous fibrous suspension using selective flotations comprises fractioning the suspension to form a fibrous fine fraction and a fibrous coarse fraction.
  • the fine fraction and coarse fraction are treated in separate flotations.
  • the flotation effects of which differ in that in the separate flotations the features of inflow consistency, overflow quantity, dwell time, chemical type, specific chemical quantity, location of chemical addition, specific quantity of flotation air added, bubble size, number of flotation cells, type of flotation cell, size of gravitational field, number of reject-related flotation steps or number of accepted stock-related flotation steps are selected differently, individually or in combination with one another.
  • the fine fraction and the coarse fraction are enriched with long fibers.
  • the flotation treating the fine fraction is a short-fiber flotation
  • the flotation treating the coarse fraction is a long-fiber flotation.
  • the fine fraction is enriched with fines and the coarse fraction is enriched with short fibers and long fibers.
  • the fractionation is carried out in a pressurized screen and the flotation treating the coarse fraction is operated with a consistency that differs from the flotation treating the fine fraction by at least approximately 0.5%.
  • the flotation treating the coarse fraction is carried out with a consistency of no more than 1.5% and the flotation treating the fine fraction is carried out with a consistency of no more than approximately 2.5%. More specifically, the flotation treating the coarse fraction is carried out with a consistency between approximately 0.7% and 1.3%, and the flotation treating the fine fraction is carried out with a consistency of between approximately 1.5% to 2%.
  • the dwell time of the suspension in the flotation treating the coarse fraction is adjusted differently by at least approximately 10% from the dwell time in the flotation treating the fine fraction. More specifically, the dwell time of the suspension in the flotation treating the coarse fraction is adjusted differently by at least approximately 20% from the dwell time in the flotation treating the fine fraction.
  • the specific quantity of fed flotation air based on volume flow is adjusted differently by at least approximately 10% from in the flotation treating the fine fraction. More specifically, in the flotation treating the coarse fraction, the specific quantity of the fed flotation air based on the volume flow is adjusted differently by at least approximately 20% from in the flotation treating the fine fraction.
  • an average bubble size in the flotation treating the coarse fraction is adjusted differently from the flotation treating the fine fraction, wherein the difference is at least approximately 10%. More specifically, the average bubble size in the flotation treating the coarse fraction is adjusted differently from in the flotation treating the fine fraction, wherein the difference is at least approximately 20%.
  • the gravitational field prevailing in the flotation treating the coarse fraction is adjusted differently from that in the flotation treating the fine fraction.
  • a different number of reject-related flotation steps is used than in the flotation treating the fine fraction.
  • a different number of accepted stock-related flotation steps is used than in the flotation treating the fine fraction.
  • a different overflow proportion is formed than in the flotation treating the fine fraction, wherein the difference is at least approximately 20%.
  • the coarse fraction is thickened, dispersed and diluted again.
  • the dispersing is carried out in a disk disperger or kneader pulper with a consistency between approximately 15% and 35%.
  • the dispersing is carried out through compression milling.
  • the specific work transferred during the dispersing is between approximately 30 and 120 kWh/t. More specifically, the specific work transferred during the dispersing is approximately 60 kWh/t.
  • the fractionation is carried out with a pressurized screen that is equipped with at least one wire.
  • the openings in the at least one wire are slots that have a slot width between approximately 0.08 and 0.3 mm. More specifically, the slot width is between approximately 0.1 to 0.15 mm.
  • the openings in the at least one wire are holes.
  • the openings in the at least one wire are round holes that have a diameter between approximately 0.1 mm and 2 mm. More specifically, the round holes have a diameter between approximately 0.3 mm to 1 mm.
  • the fractionation is carried out in a worm press.
  • the fractionation is carried out with a consistency between approximately 0.6% and 4%.
  • the fractionation is carried out in hydrocyclones with a consistency between approximately 0.1% and 2%. More specifically, the fractionation is carried out in hydrocyclones with a consistency between approximately 0.3%-0.7%.
  • no other flotation is carried out to remove foreign particles from the fibrous suspension.
  • a method of removing foreign particles from an aqueous fibrous solution comprises obtaining fine fraction and course fraction.
  • the fine fraction is mixed with air and brought to a first flotation.
  • the fine fraction is cleaned by removing flotation foam from the fine fraction and the flotation foam is guided into a reject processing.
  • the overflowing coarse fraction is diluted with water and brought to a second flotation.
  • the diluted coarse fraction is cleaned in the second flotation by removing the flotation foam from cleaned accepted stock.
  • process parameters are modified and selected differently, individually or in combination with one another for the first flotation and the second flotation.
  • the process parameters include at least one of inflow consistency, overflow quantity, dwell time, chemical type, specific chemical quantity, location of chemical addition, specific quantity of flotation air added, bubble size, number of flotation cells, type of flotation cell, size of gravitational field, number of reject-related flotation steps and number of accepted stock-related flotation steps.
  • the consistency is a thickening of the coarse fraction between approximately 15% and 25%, and the diluting is to approximately 0.5% to 1% consistency.
  • a system for removing foreign particles from an aqueous fibrous suspension comprises a fractionation configured to separate fine fraction and coarse fraction from the aqueous fibrous suspension.
  • the system also includes a first configuration for processing the fine fraction and a second configuration for processing the coarse fraction.
  • the first configuration comprises a first flotation device configured to clean foreign particles from the fine fraction.
  • the second configuration comprises a thickening apparatus configured to thicken the coarse fraction and a dispersion apparatus configured to detach foreign particles adhering to fibers in the coarse fraction.
  • the second configuration further comprises a dilution apparatus through which addition of water is provided to the course fraction, and a second flotation device configured to clean off floatable impurities from the diluted course fraction.
  • the fractionation is a wet machine equipped with a screen basket or a washing device.
  • the thickening device is a worm gear. The thickening device thickens the coarse fraction to a higher consistency between approximately 15% and 25%.
  • FIG. 1 shows a diagram of the method according to the invention
  • FIG. 2 shows, diagrammatically, a system according to the invention
  • FIG. 3 shows an embodiment in accordance with the invention.
  • FIG. 4 shows, diagrammatically, a system for implementing the method shown in FIG. 3 .
  • FIG. 1 shows a schematic diagram in which the aqueous fibrous suspension S is first fed to a fractionation (fractioning device) 3 .
  • a fractionation 3 the fibers, which are significantly longer, possibly also stiffer than the other fibers, are guided into the coarse fraction G, while the short fibers, fines, fillers and fine foreign particles are guided into the fine fraction F.
  • the liquid mainly water, flows with both fractions. Shifts in the consistency can thereby result, normally such that the fine fraction F has a lower consistency than the coarse fraction G.
  • the fractionation 3 can also be carried out such that all the fibers, or a very large part of them, reach the coarse fraction G.
  • the fine fraction F then contains few fibers (also few short fibers), but a large part of the organic and inorganic fines, including the foreign particles to be floated.
  • the proportion of the fibers, as a rule, is determined as a residue of the wire R 100 according to Bauer-McNett (laboratory method according to TAPPI standard T 233 which should be known to those of skill in the art). Fines accrue in the same analysis as throughput of the wire.
  • the fine fraction F is guided into a flotation 1 and is cleaned of foreign particles in a known manner.
  • This flotation 1 can also be called a short-fiber flotation, since its operating parameters are adapted to a suspension particularly enriched with short fibers and fines.
  • the processes with the flotation 1 are known such as, for example, by forming a flotation foam R 1 which contains a large part of the foreign particles, and a cleaned accepted stock A 1 with the predominant part of the fibers.
  • the flotation foam R 1 is removed and guided into the reject processing 8 .
  • the coarse fraction G of the fractionation 3 is diluted with water W and cleaned in the flotation 2 , which can also be called a long-fiber flotation, from which a cleaned accepted stock A 2 is obtained.
  • a flotation foam R 2 for carrying away the foreign particles is also formed. The flotation foam R 2 removed and guided into the reject processing 8 ′.
  • operating parameters and/or the system used for flotation respectively to the suspension to be floated e.g., the fine fraction F and the coarse fraction G
  • One parameter in flotation is the intake consistency, i.e., the solids content, with which the suspension is fed to the flotation system.
  • the overflow quantity based on the throughput amount of suspension, also has an influence on the effectiveness, and in particular on the cleanness of the accepted stock.
  • a large overflow quantity improves the accepted stock, but leads to higher losses or to greater expenditure in the further steps concerning reject.
  • a greater dwell time of the suspension in the flotation area can, at least within certain limits, improve the flotation effect or adjust it to more difficult materials.
  • the type and the specific chemical quantity based on the fiber quantity can be varied.
  • the cost of the chemicals which plays a role in the operating costs of a flotation system, can thereby be minimized.
  • adjustments can be made to the greater toughness of a long-fiber suspension compared to a short-fiber suspension through the quantity and type of the chemicals.
  • a targeted change is also possible through the choice of the location for adding the chemicals.
  • chemicals can, at least, partially be added during the slushing as well as directly before the flotation system.
  • the quantity and bubble size of the flotation air fed also influence the flotation effect.
  • these parameters are adjusted in particular to the size of the particles to be floated as discussed herein.
  • a larger number of flotation cells can intensify their effect while parameters otherwise remain the same as discussed herein.
  • flotation cells As is known, there are also differences in the type of flotation cells, e.g., whether it is a flotation tower with suspension guidance flowing essentially vertically or a horizontal flotation cell. While most flotation cells are operated in the gravitational field, there is also the possibility of intensifying the gravitational field, e.g., through eddies or cyclones. In many cases, the flotation is carried out again, once or several times, on the reject side of a flotation system, which is usually called the reject-related further flotation step. Thus, for example, the overflow quantity can be increased and a good yield of the entire flotation system can be achieved. Several flotation steps can also flow through in succession, i.e., one after the other, on the accept side. In many cases, it will be sufficient to change one of the parameters mentioned, but it is possible in accordance with the invention to change several of these parameters to attain the desired advantages according to the invention.
  • FIG. 2 shows a detailed diagrammatic view of the system.
  • a wet screening machine of the pressurized screen type is used for the fractionation 3 , where the screen is equipped and operated according to the requirements of a fractionation.
  • the screen is therefore not intended to be used for separating contaminants with which, if possible, all the fibers reach the throughput.
  • the parameters necessary for fractionation in the pressurized screen 7 are known such as, for example, shape and size of the wire openings, overflow rate and wire clearing.
  • screening contaminant removal
  • the fibrous suspension S is pumped into the interior of the housing of a pressurized screen and fractionated with the aid of a screen basket 7 .
  • the parameters necessary for fractionation in the pressurized screen are known such as, for example, shape and size of the wire openings, consistency of the suspension, overflow rate and type of wire clearing.
  • Typical wire openings of the screen basket 7 are round holes in the range between approximately 0.2 and 0.5 mm or slots between approximately 0.1 and 0.3 mm.
  • the division of the fiber stock into coarse and fine fraction can be adjusted through the selection of the devices and operating conditions for realizing the fractionation 3 .
  • the fractionation 3 can also be operated through the use of a washing device.
  • the filtrate of the washing device is the fine fraction F.
  • Such washing devices for fiber stocks are known and are used not only to separate the water from the solid (filter), but also fractionate the solid, itself.
  • a particularly suitable technical embodiment and the preferred parameters are described, for example, in patent specification DE 30 05 681, which is incorporated herein by reference in its entirety.
  • Devices that work in a similar manner with two circulating wire belts are also known such as, for example, as shown by EP 0 341 913, which is incorporated herein by reference in its entirety.
  • fibers can also be fractionated in hydrocyclones, whereby a consistency between approximately 0.3% and 0.7% is particularly favorable.
  • the fine fraction F of the fractionation 3 is mixed with air L and then brought to flotation.
  • the flotation system can have several steps, e.g., two, on the reject side.
  • the formed flotation foam R 1 is removed and guided into the reject processing 8 .
  • the reject processing 8 can be carried out in one or more flotation steps, for which a number of different switching possibilities are known.
  • the overflow of the fractionating pressurized screen e.g., the coarse fraction G
  • the flotation of the coarse fraction G is conducted, in general, under more difficult conditions compared to the fine fraction F.
  • the viscosity of the coarse fraction is also higher than that of the fine fraction.
  • a reduction of the consistency, e.g., to values under approximately 1.3% improves the flotation result a great deal. Since the coarse fraction G is only a partial stream, the dilution causes a relatively low strain on the overall process (stock balance, water circuits).
  • the already disintegrated recovered paper A is cleaned of coarse and medium-sized impurities through a screening 9 .
  • Perforated screens and hydrocyclones in particular are suitable for this processing step.
  • the fibrous suspension S thus formed is divided by fractionation 3 into fine fraction F and coarse fraction G.
  • it is useful to conduct a dispersion 4 before carrying out a flotation which is shown in FIGS. 3 and 4 .
  • the coarse fraction G gains a higher consistency, preferably between approximately 15% and 25%, then undergoes a dispersion 4 and subsequently a dilution 6 , e.g., to approximately 0.5% to 1% consistency.
  • a dispersion 4 the purpose of a dispersion 4 is the detachment of foreign particles adhering to the fibers. Possibly other effects that are achievable with dispergers, such as, e.g., slushing the residual fiber bundles, can also be connected therewith.
  • the dispersed and diluted stock then reaches the flotation 2 .
  • FIG. 4 shows a more detailed representation of a system used for implementing the method.
  • the fibrous suspension S is first fed to a fractionation 3 that also takes place with the aid of a pressurized screen equipped with a screen basket 7 .
  • fibers can also be fractionated in hydrocyclones or wire presses.
  • the fine fraction F e.g., the throughput through the screen basket 7 , reaches the flotation 1 in which a cleaned accepted stock A 1 and a flotation foam R 1 are formed.
  • the consistency of the coarse fraction G from the fractionation 3 is increased by thickening to a value between approximately 15% and 25%.
  • a worm press 19 may be used as one example; however, as is known, there are also other thickening apparatuses possibly working in a multi-stage manner.
  • the filtrate 10 from this thickening can be used to form the fibrous suspension S.
  • the thickened stock 11 then reaches a disk disperger 18 via a conveyor screw system (not shown), in which the disperger, e.g., dispersion tools provided with teeth are moved relative to one another at a close distance, causes a dispersion of the high-consistency stock through high shear forces.
  • a kneader pulper can also be used for this processing step.
  • a dilution 6 occurs through the addition of water W, e.g., in a vat.
  • the fibrous suspension thus prepared is subsequently cleaned of floatable impurities in the flotation 2 with good results.
  • the accepted stock A 1 of the flotation 1 and the accepted stock A 2 of the flotation 2 can be mixed and further processed in a vat 12 .
  • the invention makes it possible to save on further flotations, since an already fully satisfactory flotation result can be achieved through the flotations 1 and 2 specifically adapted to the individual fractions.

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  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
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US11/431,633 2005-05-12 2006-05-11 System and method for removing foreign particles from an aqueous fibrous suspension Abandoned US20060254732A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102005021929 2005-05-12
DE102005021929.2 2005-05-12
DE102005060476.5 2005-12-17
DE102005060476 2005-12-17

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EP (1) EP1728918A3 (de)
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US20090188635A1 (en) * 2008-01-28 2009-07-30 Andritz Oy Method and apparatus for treating pulp
WO2012001239A1 (en) * 2010-07-02 2012-01-05 Haarla Oy Method and arrangement
US8926793B2 (en) 2011-03-31 2015-01-06 Nippon Paper Industries Co., Ltd. Processes for preparing pulp and paper
DE102016200987A1 (de) * 2016-01-25 2017-07-27 Voith Patent Gmbh Faserstoffbehandlung

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EP1798330A1 (de) * 2005-12-17 2007-06-20 Voith Patent GmbH Verfahren zur Dispergierung von Papierfaserstoff
EP1798331B1 (de) * 2005-12-17 2010-05-26 Voith Patent GmbH Verfahren zur Dispergierung von Papierfaserstoffen
DE102007017987A1 (de) * 2007-04-14 2008-10-16 Ptc Paper Technology Consulting Gmbh Verfahren und Vorrichtung zum Aufbereiten von Altpapier
DE102007044952A1 (de) * 2007-09-20 2009-04-02 Voith Patent Gmbh Verfahren zur Behandlung einer Papierfasersuspension
DE102008009134A1 (de) * 2008-02-14 2009-08-20 Voith Patent Gmbh Verfahren zur Entfernung von Störstoffen aus einer wässrigen Faserstoffsuspension
DE102009045965A1 (de) * 2009-10-23 2011-04-28 Voith Patent Gmbh Verfahren zur Entfernung von Feststoffen aus einer Faserstoffsuspension durch Flotation
JP5952030B2 (ja) * 2011-03-31 2016-07-13 日本製紙株式会社 紙の製造方法
DE102015201996A1 (de) * 2015-02-05 2016-08-11 Voith Patent Gmbh Faserstoffbehandlung
PL414125A1 (pl) * 2015-09-23 2017-03-27 Pe Beskidy Spółka Z Ograniczoną Odpowiedzialnością Spółka Komandytowa Sposób frakcjonowania papierniczej masy makulaturowej w trakcie rozwłókniania oraz rozdzielonej obróbki frakcji
JP6583005B2 (ja) * 2016-01-12 2019-10-02 王子ホールディングス株式会社 脱墨古紙パルプの製造方法及び製造システム

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US5478441A (en) * 1992-06-17 1995-12-26 The Wiggins Teape Group Limited Recovery and re-use of raw materials from paper mill waste sludge
US5423993A (en) * 1993-08-06 1995-06-13 John A. Boney Fiber recovery system and process
US5882475A (en) * 1997-03-26 1999-03-16 Ahlstrom Machinery Inc. Method of recovering fibers from a reject stream generated in a wastepaper treating process

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090188635A1 (en) * 2008-01-28 2009-07-30 Andritz Oy Method and apparatus for treating pulp
US7951263B2 (en) * 2008-01-28 2011-05-31 Andritz Oy Method and apparatus for treating pulp
WO2012001239A1 (en) * 2010-07-02 2012-01-05 Haarla Oy Method and arrangement
US9370779B2 (en) 2010-07-02 2016-06-21 Haarla Oy Method and arrangement
US8926793B2 (en) 2011-03-31 2015-01-06 Nippon Paper Industries Co., Ltd. Processes for preparing pulp and paper
DE102016200987A1 (de) * 2016-01-25 2017-07-27 Voith Patent Gmbh Faserstoffbehandlung

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