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EP1223245B1 - Process for cleaning a pulp of primary fibres - Google Patents

Process for cleaning a pulp of primary fibres Download PDF

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Publication number
EP1223245B1
EP1223245B1 EP02000753A EP02000753A EP1223245B1 EP 1223245 B1 EP1223245 B1 EP 1223245B1 EP 02000753 A EP02000753 A EP 02000753A EP 02000753 A EP02000753 A EP 02000753A EP 1223245 B1 EP1223245 B1 EP 1223245B1
Authority
EP
European Patent Office
Prior art keywords
bleaching
stage
flotation
pulp
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.)
Revoked
Application number
EP02000753A
Other languages
German (de)
French (fr)
Other versions
EP1223245A2 (en
EP1223245A3 (en
Inventor
Volker Dr. Gehr
Peter Respondek
Martin Kemper
Peter Schweiss
Thomas Martin
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 Paper Fiber and Environmental Solutions GmbH and Co KG
Original Assignee
Voith Paper Fiber Systems GmbH and Co KG
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
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Application filed by Voith Paper Fiber Systems GmbH and Co KG filed Critical Voith Paper Fiber Systems GmbH and Co KG
Publication of EP1223245A2 publication Critical patent/EP1223245A2/en
Publication of EP1223245A3 publication Critical patent/EP1223245A3/en
Application granted granted Critical
Publication of EP1223245B1 publication Critical patent/EP1223245B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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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
    • D21C9/02—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
    • 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
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means
    • 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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • the invention is based on the object, a method of the type specified create, with which it succeeds, remaining impurities reliably from the remove primary pulp suspension. This should be the produced pulp quality improvement and / or the production process becomes more efficient let shape.
  • the flotation with particular advantage in the Primary fiber production used to z. B. in the pulp cooking or bleaching left over remove remaining interfering components. Unlike the fiber behave such impurities are hydrophobic. It is also possible by chemical Make treatment hydrophobic.
  • Another advantage of the method is the consideration of the overall economy the pulp production plant in which the process is used. Because of the said possibilities for better Entferung unwanted, fine components Requirements for the actual manufacturing and bleaching process kept lower can be considered, the overall result of the possibility of a low-priced Primary pulp production.
  • Primary pulp production becomes diverse natural, mature raw materials used in the same batch depending on origin, genus, species, climate, biological conditions, etc. have quite different characteristics can. In many cases, it is therefore only with great effort or not possible, for.
  • B. vote the cooking process for primary pulp production so that this heterogeneous raw material can be optimally prepared, in this context the freedom of unwanted components is meant.
  • the Primary pulp production also other important requirements, such. B. strength, Fiber length etc. are taken into account, resulting in a very complex Manufacturing process leads.
  • the scheme is an example of the application of the method Details of the primary pulp production have not been received, as they are the expert are known anyway and a variety of different processes is possible.
  • Raw material R is added to a digester 1 where it is thermally and chemically is converted to pulp P.
  • the cooking process is followed by a thickening stage 2 with Partial recycling of washed lye in the digester 1.
  • the thickened Pulp P ' is now in a purification stage 3, which is indicated here as a sorting stage, freed from interfering components. But this cleaning step can also be done with others work on known separation process.
  • the pulp comes in one Bleaching stage 4 or a bleaching sequence, which may consist of several bleaching stages, with 4 'only one more is given here.
  • the substance is diluted with water W and collected in a chest 6.
  • a further mechanical separation of Pulp fibers in the suspension required. It is usually superfluous, one To carry out treatment in which the pulp itself is changed.
  • the filtrate in the flotation 7 is performed. He can undergo further purification which can be advantageously used with highly effective cleaners, e.g. With work at least 100 times the acceleration of gravity.
  • the thickening stage can be beneficial aim for optimal washing effect.
  • the clear water 11 of the flotation may e.g. to the Thinning to be used again.
  • the thickened suspension contains the purified Primary pulp and is collected in the Stoffbütte 8. He is after another Treatment suitable for paper production.
  • the flotation can be carried out advantageously neutral or in an acidic environment.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

After bleaching (4') a process remove impurities from a suspension (S) of primary cellulose. The process employs a thickening or washing stage (9) surrendering to a filter and a subsequent micro-floatation stage (7). The vast majority of impurities are solids liberated by boiling cellulose and removed by micro-floatation in a neutral or acid zone. The individual cellulose fibres are separated by a 100G hydro-cyclone between the bleaching (4') and floatation (7) stages.

Description

Die Erfindung bezieht sich auf ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of claim 1.

Unter Primärfaserstoff versteht man z. B. chemisch erzeugten Zellstoff, mechanisch erzeugten Holzschliff oder Mischformen, wie z. B. TMP, CTMP usw. Bei der Erzeugung dieser Primärfaserstoffe werden durch Kochen und Bleichen die aus dem Holz stammenden Ligninbestandteile im Wesentlichen entfernt. Dennoch verbleiben oft unerwünschte, feste, kolloidal gelöste oder gelöste Bestandteile, wie z. B. Harze, Rindenpartikel oder kleine Splitter. Zwar wird bereits versucht, diese Bestandteile wenigstens teilweise durch hochwirksame Sortier- und Reinigungsverfahren zu entfernen; solche Verfahren sind aber auf der einen Seite aufwendig und auf der anderen Seite nicht immer vollständig befriedigend. Daher muss oft in Kauf genommen werden, dass die Primärfaserstoffe nicht sauber sind, also das aus ihnen erzeugte Papier Schmutzpunkte aufweist oder dass daraus eine schlechte Papiermaschinen-Runability resultiert.Under primary pulp is understood z. As chemically produced pulp, mechanically generated wood pulp or mixed forms, such. TMP, CTMP, etc. In production These primary fiber fabrics are made by cooking and bleaching those from the wood originating lignin components substantially removed. Nevertheless, they often remain unwanted, solid, colloidally dissolved or dissolved components, such. Resins, Bark particles or small fragments. Although already tried, these ingredients at least in part by highly efficient sorting and purification processes remove; However, such processes are on the one hand consuming and on the other Page not always completely satisfactory. Therefore, it often has to be accepted that the primary fiber fabrics are not clean, that is, the paper produced from them Dirt points or that from poor paper machine runability results.

Aus der EP 0 522 334 A1 ist ein Verfahren zur Behandlung von bei der CTMP-Produktion anfallendem Abwasser bekannt. Dieses Verfahren dient jedoch dazu, die Ausbeute der Produktion zu erhöhen, also Faser- und Feinstoffverluste zu reduzieren. Um das zu erreichen, wird eine umfangreiche chemische Behandlung vorgeschlagen, die zur Koagulation aller zu gewinnenden Stoffe führt, so dass diese anschließend in einer Mikroflotation vom zurückbleibenden Klarwasser abgetrennt werden können. Der Flotationsschlamm enthält daher Stoffe, die weiter verarbeitet werden und nicht als Störstoffe anzusehen sind.From EP 0 522 334 A1 a method for the treatment of in the CTMP production wastewater known. However, this method is used To increase the yield of production, ie fiber and fine material losses too to reduce. To achieve this, will be an extensive chemical treatment proposed, which leads to the coagulation of all substances to be extracted, so that these then separated from the remaining clear water in a microflotation can be. The flotation sludge therefore contains substances that are processed further and are not to be regarded as contaminants.

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren der angegebenen Art zu schaffen, mit dem es gelingt, restliche Verunreinigungen zuverlässig aus der primärfaserstoffhaltigen Suspension zu entfernen. Dadurch soll der erzeugte Faserstoff qualitativ verbessert werden und/oder sich das Erzeugungsverfahren wirtschaftlicher gestalten lassen.The invention is based on the object, a method of the type specified create, with which it succeeds, remaining impurities reliably from the remove primary pulp suspension. This should be the produced pulp quality improvement and / or the production process becomes more efficient let shape.

Diese Aufgabe wird durch die Kennzeichen des Anspruchs 1 erfüllt.This object is achieved by the characteristics of claim 1.

Verbesserungen des Verfahrens lassen sich erzielen, wenn die Maßnahmen der Unteransprüche benutzt werden.Improvements to the process can be achieved if the measures of the Subclaims are used.

Es ist an sich bekannt, Flotationsverfahren bei der Aufbereitung von Altpapier einzusetzen. Dabei werden jedoch solche Bestandteile aus der Altpapiersuspension entfernt, die nicht vom Faserstoff oder Papier her stammen. Vielmehr sind sie als Verunreinigungen angefallen, die ursächlich mit dem Gebrauch des Papieres zusammenhängen, also erst nach dessen Erzeugung hinzugekommen sind. Derartige Verunreinigungen sind z. B. die Druckfarben von graphischen Altpapieren, Verunreinigungen, die aus dem sonstigen Gebrauch des Papiers stammen oder auch Kleberücken, um nur einige zu nennen.It is known per se, flotation in the treatment of waste paper use. However, such components are from the waste paper suspension removed from the pulp or paper. Rather, they are as Impurities accumulated, the cause of the use of the paper are related, that is to say have only been added after its generation. such Impurities are z. B. the printing inks of graphic waste paper, Contaminants that come from the other use of the paper or even Adhesive backing, just to name a few.

Erfindungsgemäß wird die Flotation mit besonderem Vorteil bei der Primärfasererzeugung eingesetzt, um z. B. bei der Zellstoffkochung oder Bleiche übrig gebliebene störende Bestandteile zu entfernen. Im Gegensatz zur Faser verhalten sich solche Verunreinigungen hydrophob. Es ist auch möglich, sie durch chemische Behandlung hydrophob zu machen.According to the invention, the flotation with particular advantage in the Primary fiber production used to z. B. in the pulp cooking or bleaching left over remove remaining interfering components. Unlike the fiber behave such impurities are hydrophobic. It is also possible by chemical Make treatment hydrophobic.

Ein weiterer Vorteil des Verfahrens ergibt sich bei der Betrachtung der Gesamtökonomie der Faserstofferzeugungsanlage, in der das Verfahren angewendet wird. Da durch die genannten Möglichkeiten zur besseren Entferung unerwünschter, feiner Bestandteile die Anforderungen an den eigentlichen Herstellungs- und Bleichprozeß geringer gehalten werden können, ergibt sich gesamthaft betrachtet die Möglichkeit einer preisgünstigen Primärfaserstofferzeugung. Ein ähnlicher Gesichtspunkt liegt im Folgenden: Zur Primärfaserstofferzeugung werden diverse natürliche, gewachsene Rohstoffe verwendet, die auch in derselben Charge in Abhängigkeit von Herkunft, Gattung, Art, Klima, biologischen Gegebenheiten usw. recht unterschiedliche Eigenschaften haben können. In vielen Fällen ist es daher nur mit großem Aufwand oder gar nicht möglich, z. B. den Kochprozess zur Primärfaserstofferzeugung so abzustimmen, dass dieser heterogene Rohstoff optimal aufbereitet werden kann, wobei in diesem Zusammenhang die Freiheit von unerwünschten Bestandteilen gemeint ist. Schließlich müssen bei der Primärfaserstofferzeugung auch andere wichtige Forderungen, wie z. B. Festigkeit, Faserlänge etc. berücksichtigt werden, was zu einem sehr komplexen Herstellungsverfahren führt. Diese Probleme können mit Hilfe des erfindungsgemäßen Verfahrens sehr viel leichter gelöst werden.Another advantage of the method is the consideration of the overall economy the pulp production plant in which the process is used. Because of the said possibilities for better Entferung unwanted, fine components Requirements for the actual manufacturing and bleaching process kept lower can be considered, the overall result of the possibility of a low-priced Primary pulp production. A similar point of view lies in the following: Primary pulp production becomes diverse natural, mature raw materials used in the same batch depending on origin, genus, species, Climate, biological conditions, etc. have quite different characteristics can. In many cases, it is therefore only with great effort or not possible, for. B. vote the cooking process for primary pulp production so that this heterogeneous raw material can be optimally prepared, in this context the freedom of unwanted components is meant. Finally, at the Primary pulp production also other important requirements, such. B. strength, Fiber length etc. are taken into account, resulting in a very complex Manufacturing process leads. These problems can be solved with the aid of the invention Be solved much easier.

Die Erfindung wird erläutert anhand eines figürlich dargestellten Anlagenschemas.The invention will be explained with reference to a system diagram shown in FIG.

Das Schema stellt ein Beispiel für die Anwendung des Verfahrens dar. Dabei wird auf die Details der Primärfaserstoff-Erzeugung nicht eingegangen, da sie dem Fachmann ohnehin bekannt sind und eine Vielzahl von verschiedenen Prozessen möglich ist. Der Rohstoff R wird in einen Zellstoffkocher 1 zugegeben, in dem er thermisch und chemisch zur Pulpe P umgesetzt wird. Dem Kochprozess folgt eine Eindickstufe 2 mit Teilrückführung der ausgewaschenen Lauge in den Zellstoffkocher 1. Die eingedickte Pulpe P' wird nun in einer Reinigungsstufe 3, die hier als Sortierstufe angedeutet ist, von störenden Bestandteilen befreit. Diese Reinigungsstufe kann aber auch mit anderen an sich bekannten Trennverfahren arbeiten. Als nächstes kommt die Pulpe in eine Bleichstufe 4 oder eine Bleichsequenz, die aus mehreren Bleichstufen bestehen kann, wobei hier mit 4' lediglich eine weitere angegeben ist. Am Ende der Bleichsequenz wird der Stoff mit Wasser W verdünnt und in einer Bütte 6 gesammelt. Eventuell ist an dieser Stelle des Verfahrens auch eine weitere mechanische Vereinzelung der Zellstoffasern in der Suspension erforderlich. Dabei ist es meist überflüssig, eine Behandlung vorzunehmen, bei der der Faserstoff selbst verändert wird. Der Primärfaserstoff gelangt nun als Suspension S in eine Eindickstufe 9, deren Filtrat in die Flotation 7 geführt wird. Dabei kann er einer weiteren Reinigung unterzogen werden, wozu mit Vorteil hochwirksame Cleaner verwendet werden können, die z.B. mit mindestens 100-facher Erdbeschleunigung arbeiten. Die Eindickstufe kann mit Vorteil auf optimalen Wascheffekt zielen. Das Klarwasser 11 der Flotation kann z.B. zum Verdünnen wieder verwendet werden. Die eingedickte Suspension enthält den gereinigten Primärfaserstoff und wird in der Stoffbütte 8 gesammelt. Er ist nach weiterer Behandlung zur Papiererzeugung geeignet.The scheme is an example of the application of the method Details of the primary pulp production have not been received, as they are the expert are known anyway and a variety of different processes is possible. Of the Raw material R is added to a digester 1 where it is thermally and chemically is converted to pulp P. The cooking process is followed by a thickening stage 2 with Partial recycling of washed lye in the digester 1. The thickened Pulp P 'is now in a purification stage 3, which is indicated here as a sorting stage, freed from interfering components. But this cleaning step can also be done with others work on known separation process. Next, the pulp comes in one Bleaching stage 4 or a bleaching sequence, which may consist of several bleaching stages, with 4 'only one more is given here. At the end of the bleaching sequence becomes the substance is diluted with water W and collected in a chest 6. Maybe it's on This point of the procedure also a further mechanical separation of Pulp fibers in the suspension required. It is usually superfluous, one To carry out treatment in which the pulp itself is changed. Of the Primary pulp now passes as a suspension S in a thickening stage 9, the filtrate in the flotation 7 is performed. He can undergo further purification which can be advantageously used with highly effective cleaners, e.g. With work at least 100 times the acceleration of gravity. The thickening stage can be beneficial aim for optimal washing effect. The clear water 11 of the flotation may e.g. to the Thinning to be used again. The thickened suspension contains the purified Primary pulp and is collected in the Stoffbütte 8. He is after another Treatment suitable for paper production.

Die Flotation kann mit Vorteil neutral oder im sauren Milieu durchgeführt werden.The flotation can be carried out advantageously neutral or in an acidic environment.

Claims (7)

  1. A method for cleaning a suspension of bleached primary fibre material,
    characterised in that
    the suspension (S) after the bleaching stage (4') or following a bleaching sequence (4, 4') is sent for thickening or washing and the filtrate produced thereby is treated in a flotation stage (7), preferably a microflotation stage, in which the predominant portion of the solids is removed by flotation.
  2. A method according to Claim 1,
    characterised in that
    the solids removed by flotation are anionic trash.
  3. A method according to Claim 2,
    characterised in that
    the floated-out solids are disrupting constituents left over from the pulp cooking or bleaching.
  4. A method according to Claim 1, 2 or 3,
    characterised in that
    the flotation (7) is carried out in the neutral range.
  5. A method according to Claim 1, 2 or 3,
    characterised in that
    the flotation (7) is carried out in the acidic range.
  6. A method according to one of the preceding claims,
    characterised in that
    between the bleaching stage (4') or the bleaching sequence (4) and the flotation stage (7) mechanical isolation of the pulp fibres takes place, without the fibres themselves being changed.
  7. A method according to one of the preceding claims,
    characterised in that
    the suspension (S) between the bleaching stage (4') or bleaching sequence (4, 4') and flotation stage (7) is purified in a hydrocyclone with at least one hundred times the acceleration due to gravity.
EP02000753A 1996-09-05 1997-07-15 Process for cleaning a pulp of primary fibres Revoked EP1223245B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19635967A DE19635967A1 (en) 1996-09-05 1996-09-05 Process for cleaning a suspension of primary fiber
DE19635967 1996-09-05
EP97112005A EP0828026B1 (en) 1996-09-05 1997-07-15 Process for cleaning a pulp of primary fibres

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP97112005A Division EP0828026B1 (en) 1996-09-05 1997-07-15 Process for cleaning a pulp of primary fibres

Publications (3)

Publication Number Publication Date
EP1223245A2 EP1223245A2 (en) 2002-07-17
EP1223245A3 EP1223245A3 (en) 2004-06-02
EP1223245B1 true EP1223245B1 (en) 2005-10-26

Family

ID=7804657

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97112005A Expired - Lifetime EP0828026B1 (en) 1996-09-05 1997-07-15 Process for cleaning a pulp of primary fibres
EP02000753A Revoked EP1223245B1 (en) 1996-09-05 1997-07-15 Process for cleaning a pulp of primary fibres

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP97112005A Expired - Lifetime EP0828026B1 (en) 1996-09-05 1997-07-15 Process for cleaning a pulp of primary fibres

Country Status (3)

Country Link
EP (2) EP0828026B1 (en)
AT (2) ATE307923T1 (en)
DE (3) DE19635967A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107700263B (en) * 2016-08-08 2020-10-09 迅普精工株式会社 Deinking device and waste paper recycling device
CN109629300B (en) * 2018-12-28 2021-08-24 四川凤生纸业科技股份有限公司 Efficient pulping system for paper pulp production line and pulp washing process

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE310554C (en) *
US5178770A (en) * 1991-07-12 1993-01-12 Nalco Canada Inc. Method of treating bctmp/ctmp wastewater
DE4317466A1 (en) * 1993-05-26 1994-12-01 Degussa Improved process for bleaching wood pulp
EP0791103A4 (en) * 1994-08-31 1998-12-30 Hoffman Environmental Systems Method of papermaking having zero liquid discharge

Also Published As

Publication number Publication date
DE59708425D1 (en) 2002-11-14
ATE225878T1 (en) 2002-10-15
EP0828026B1 (en) 2002-10-09
EP0828026A1 (en) 1998-03-11
DE59712461D1 (en) 2005-12-01
EP1223245A2 (en) 2002-07-17
ATE307923T1 (en) 2005-11-15
EP1223245A3 (en) 2004-06-02
DE19635967A1 (en) 1998-03-12

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