WO2014135335A1 - Préparation de matière fibreuse - Google Patents

Préparation de matière fibreuse Download PDF

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Publication number
WO2014135335A1
WO2014135335A1 PCT/EP2014/052508 EP2014052508W WO2014135335A1 WO 2014135335 A1 WO2014135335 A1 WO 2014135335A1 EP 2014052508 W EP2014052508 W EP 2014052508W WO 2014135335 A1 WO2014135335 A1 WO 2014135335A1
Authority
WO
WIPO (PCT)
Prior art keywords
stage
pulp suspension
dewatering
coarse
fraction
Prior art date
Application number
PCT/EP2014/052508
Other languages
German (de)
English (en)
Inventor
Werner Brettschneider
Albrecht FALK
Alexander Peschl
Fanny Balke
Original Assignee
Voith 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 Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2014135335A1 publication Critical patent/WO2014135335A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • 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
    • D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • 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
    • D21D5/02—Straining or screening the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • 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 the formation and treatment of a pulp suspension suitable for the production of graphic or hygiene papers, special papers or cover layers for cardboard or packaging papers, wherein the pulp suspension from a dissolving stage over a plurality of treatment stages at least partially results in a dewatering process. Stage is performed. In the dissolution stage, the separation and separation of the fibers and the waste paper and the detachment of the printing inks. This is followed by several process steps for the treatment of the pulp suspension until the pulp suspension meets the required parameters and can be transferred to a machine for producing a fibrous web.
  • the pulp suspension before a full or partial flow flotation usually passes through a hole sorting and a heavy-particle cleaning.
  • the object of the invention is therefore to reduce the effort for the treatment of the pulp suspension without significantly affecting the quality of the finished material produced.
  • this object is achieved in that the consistency of the pulp suspension between the outlet of the dissolving stage and the inlet of the first dewatering stage of the total flow or a partial flow of the pulp suspension is at least 2%. Due to this relatively high consistency, the amount of pulp suspension to be treated decreases considerably, which is why the corresponding treatment units can be made smaller and require less energy. It is deliberately accepted that some treatment units work somewhat less efficiently at these high densities, especially hydrocyclones for cleaning the pulp suspension.
  • this partial stream should be as large as possible in the interests of a broad utilization of the advantages and preferably comprise more than 50% of the pulp suspension to be treated.
  • the consistency of the pulp suspension at the outlet of the dissolution stage should be at least 4%, preferably at least 4.5%, and in particular between 4.5 and 5%.
  • HC pulpers are suitable for this purpose.
  • the container should have one or more interconnected truncated cones, the largest diameter of which adjoins the side wall of the container and which are arranged so that their inner diameter decreases from top to bottom.
  • the pulper can advantageously be supplemented by flow barriers on the side wall of the container, which brake the circumferential flow and guide the pulp suspension to the center and thus support the dissolution.
  • the first hydrocyclone acts as a heavy duty cleaner, the consistency of the Fibrous suspension in the first hydrocyclone between 4 and 5%, preferably between 4.3 and 4.7%.
  • its inner surface has a polygonal cross section in the area of the heavy part outlet.
  • the sorting or fractionating stages which are generally used here already work with relatively high overflow or reject rates. Therefore, they can also easily cope with the increased by the omission of the hole or slot sorting (gross sorting) increased Störstofffracht. Because of operational safety, the first or only fractionating stage should be formed by a slot sorter having a sieve element with sieve openings in the form of slots having a slot width of at most 0.2 mm, which is rotationally symmetrical about a sieve axis.
  • the pulp suspension is passed through slots for the first time during this fractionation.
  • a scrubber is usually used as the dewatering stage, which simultaneously serves for deashing.
  • the coarse and fine fractions are passed together through at least one dewatering stage or via separate dewatering stages.
  • the coarse and fine fractions pass through a common dehydration step, they should have separate chambers for the thickening of both fractions, but preferably the filtrate is removed together.
  • the fine fraction can be performed on a dewatering stage.
  • the fractions can also be reunited and pass through one or more drainage stages together.
  • the fine and / or coarse fraction should pass through at least one flotation stage.
  • At least one treatment stage of the coarse fraction should be formed by a disperser or kneader or refiner in order to replace the To ensure printing inks and dirt particles from the fibers.
  • the drainage stages are advantageously formed by screw presses, disc thickeners or scrubbers.
  • the pulp suspension should be at least partially formed from waste paper and be suitable for the production of graphic papers or tissue papers or specialty papers or upper layers (white blanket) of cardboard and packaging papers.
  • the stock preparation a dissolution level 3 for the dissolution of the waste paper and possibly other fibers in the form of a pulp or similar. and at least one of the following sorting / fractionating stage 5 for forming a long fiber-enriched coarse 1 and a short fiber-enriched fine fraction 2, wherein at least the coarse fraction 1 is fed to a dewatering stage 9 and the consistency of the pulp suspension between the spout the dissolution stage 3 and the inlet of the first dewatering stage 9 is at least 2%.
  • This high consistency reduces the effort and energy for the treatment of the pulp suspension considerably, even if it can affect the effectiveness of certain treatment units, such as the hydrocyclones.
  • dissolving drums or HC pulpers are suitable for this purpose.
  • the cleaning of the pulp suspension stream between dissolution stage 3 and first fractionation stage 5 takes place exclusively via one or more purification stages 4 in the form of one hydrocyclone each.
  • These cleaning stages 4 may be, for example, a high consistency cleaning stage or a heavy cleaning stage, which are passed through successively.
  • the consistency of the pulp suspension in the first hydrocyclone is between 4.3 and 4.7%.
  • Hydrocyclones are capable of concentrating and extracting heavy particles in pulp suspension by centrifugal forces.
  • the pulp suspension is pumped tangentially into the interior of the hydrocyclone via an inlet and rotated in the downwardly conical interior.
  • the purified pulp suspension is discharged as accepts via the centrally arranged overhead spout, the heavy parts reach the Schwerteilauslass via a connecting part whose inner surface forms a polygon.
  • the fractionation stage 5 is designed as a slot pressure sorter and separates the pulp suspension stream into a coarse fraction 1 with a high proportion of long fibers and / or high impurity content and a fine fraction 2 with a small proportion of longer fibers and / or a lower impurity content.
  • the first fractionation stage 5 Since the first fractionation stage 5 is already operated at a relatively high reject rate (preferably 20-50%), it can easily process the higher amount of contaminant due to the lack of hole sorting prior to fractionation.
  • the coarse fraction 1 is passed by way of example according to FIG. 1 through one or more sorting stages 7, one or more dewatering stages 9, a disperser 10 and / or refiner and, in the case of high brightness requirements, also a bleaching stage 11 and then again merged with the fine fraction 2.
  • the pulp suspension then passes through a flotation stage 8 and, if necessary, also one or more dewatering stages 9 and a bleaching stage 1 1.
  • the coarse fraction 1 in Figure 2 passes through only one or more sorting stages 7 before both fractions 1, 2 are reunited.
  • the pulp suspension can be treated according to the requirements.
  • the pulp suspension successively passes through a flotation stage 8, possibly a sorting stage 7, one or more dewatering stages 9, a disperser 10, possibly a bleaching stage 1 1, if necessary, a flotation stage 8 and possibly even one or several dewatering stages 9 and a bleaching stage 1 1.
  • a flotation stage 8 possibly a sorting stage 7, one or more dewatering stages 9, a disperser 10, possibly a bleaching stage 1 1, if necessary, a flotation stage 8 and possibly even one or several dewatering stages 9 and a bleaching stage 1 1.
  • the coarse 1 and the fine fraction 2 are treated separately, with only the coarse fraction 1 passing through a disperser 10.
  • the coarse fraction 1 via one or more sorting stages 7, one or more dewatering stages 9, the disperser, possibly a bleaching stage 1 1, a flotation stage 8, possibly a cleaning stage 4 and one or several dewatering stages 9 and the fine fraction 2 via a flotation stage 8, a sorting stage 7, possibly a cleaning stage 4 and one or more dewatering stages 9 passed.
  • the plant shown in FIG. 4 has two fractionating stages 5, 6.
  • the coarse fraction 1 of the first fractionating stage 5 is passed through one or more sorting stages 7 and, after being brought together with the corresponding fine fraction 2, passed via a flotation stage 8 to the second fractionating stage 6.
  • the coarse fraction 1 of the second fractionating stage 6 then passes through a sorting stage 7, one or more dewatering stages 9, a disperser 10, possibly a bleaching stage 11 and a flotation stage 8 before both fractions 1, 2 are reunited become. This is followed by the common running through possibly a cleaning stage 4, one or more dewatering stages 9 and possibly also a bleaching stage 1 1 at.
  • the heavy-particle cleaning stage 4 between the dissolution-3 and the first fractionation stage 5 can also be formed by a plurality of hydrocyclones.
  • the reject of the first hydrocyclone enters a second hydrocyclone. While the Accept this second hydrocyclone is recycled to the inlet of the first hydrocyclone, the reject of the second hydrocyclone passes into a third hydrocyclone, the Accept of the coarse fraction 1 is mixed.
  • drainage stages 9 are particularly suitable screw extruder, disc filter or scrubber because of the high density.
  • a deterioration in efficiency due to the higher consistency, especially in the case of deinking flotation, may be due to a higher number of Ventilation points and / or the inclusion of, the ventilation assisting devices are compensated.
  • the higher investment costs are quickly compensated by the greatly reduced energy costs for plant operation.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de formation et de traitement d'une suspension de matière fibreuse adaptée à la fabrication de papier graphique ou hygiénique ou de couches de recouvrement pour des cartons ou des papiers d'emballage. La suspension de matière fibreuse est guidée d'un étage de décomposition (3) au moins en partie à un étage d'élimination de l'eau (9) en passant par plusieurs étages de traitement. L'invention vise à diminuer la complexité du traitement de la matière fibreuse. A cet effet, la densité apparente de la matière fibreuse entre la sortie de l'étage de décomposition (3) et l'entrée de l'étage d'élimination de l'eau (9) atteint au moins 2 %.
PCT/EP2014/052508 2013-03-07 2014-02-10 Préparation de matière fibreuse WO2014135335A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013203862 2013-03-07
DE102013203862.3 2013-03-07

Publications (1)

Publication Number Publication Date
WO2014135335A1 true WO2014135335A1 (fr) 2014-09-12

Family

ID=50070573

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/052508 WO2014135335A1 (fr) 2013-03-07 2014-02-10 Préparation de matière fibreuse

Country Status (1)

Country Link
WO (1) WO2014135335A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107208371A (zh) * 2015-02-05 2017-09-26 福伊特专利有限公司 纤维处理方法
DE102018120175A1 (de) * 2018-08-20 2020-02-20 Voith Patent Gmbh Faserstoffaufbereitung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175128A1 (fr) * 1984-08-30 1986-03-26 Sulzer-Escher Wyss Gmbh Procédé et dispositif pour la préparation de pâte
EP0261025A1 (fr) * 1986-09-15 1988-03-23 E. et M. LAMORT Procédé et installations de traitement de vieux papiers imprimés
EP1798329A1 (fr) * 2005-12-17 2007-06-20 Voith Patent GmbH Procédé pour enlever des contaminants d'une suspension aqueuse de fibres
DE102007017987A1 (de) * 2007-04-14 2008-10-16 Ptc Paper Technology Consulting Gmbh Verfahren und Vorrichtung zum Aufbereiten von Altpapier
DE102008013458A1 (de) * 2008-03-10 2009-09-17 Voith Patent Gmbh Verfahren zur Entfernung von Störstoffen aus einer wässrigen Faserstoffsuspension

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175128A1 (fr) * 1984-08-30 1986-03-26 Sulzer-Escher Wyss Gmbh Procédé et dispositif pour la préparation de pâte
EP0261025A1 (fr) * 1986-09-15 1988-03-23 E. et M. LAMORT Procédé et installations de traitement de vieux papiers imprimés
EP1798329A1 (fr) * 2005-12-17 2007-06-20 Voith Patent GmbH Procédé pour enlever des contaminants d'une suspension aqueuse de fibres
DE102007017987A1 (de) * 2007-04-14 2008-10-16 Ptc Paper Technology Consulting Gmbh Verfahren und Vorrichtung zum Aufbereiten von Altpapier
DE102008013458A1 (de) * 2008-03-10 2009-09-17 Voith Patent Gmbh Verfahren zur Entfernung von Störstoffen aus einer wässrigen Faserstoffsuspension

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107208371A (zh) * 2015-02-05 2017-09-26 福伊特专利有限公司 纤维处理方法
DE102018120175A1 (de) * 2018-08-20 2020-02-20 Voith Patent Gmbh Faserstoffaufbereitung
CN112601857A (zh) * 2018-08-20 2021-04-02 福伊特专利有限公司 纤维制备

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