DE102009006308A1 - Method for treating paper fiber suspension obtained from waste paper, involves recognizing part of filtrate system by upstream thickening, and recognizing another part of filtrate system by cleaner - Google Patents
Method for treating paper fiber suspension obtained from waste paper, involves recognizing part of filtrate system by upstream thickening, and recognizing another part of filtrate system by cleaner Download PDFInfo
- Publication number
- DE102009006308A1 DE102009006308A1 DE200910006308 DE102009006308A DE102009006308A1 DE 102009006308 A1 DE102009006308 A1 DE 102009006308A1 DE 200910006308 DE200910006308 DE 200910006308 DE 102009006308 A DE102009006308 A DE 102009006308A DE 102009006308 A1 DE102009006308 A1 DE 102009006308A1
- Authority
- DE
- Germany
- Prior art keywords
- thickening
- filtrate
- upstream
- cleaning
- 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.)
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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
-
- 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
- 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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Behandlung einer Papierfasersuspension, insbesondere einer aus Altpapier gewonnenen Papierfasersuspension, welches mindestens eine Reinigung zur Entfernung von Störstoffen mit mindestens einer Flotation umfasst, sowie mindestens zwei Eindickungen, in der Filtrate gebildet werden, welche der Reinigung folgen, wobei das Filtrat einer stromabwärtigen Eindickung zumindest teilweise vor einer Eindickung wieder zugegeben wird, die stromaufwärts der Eindickung liegt, aus der das Filtrat stammt.The The invention relates to a method for treating a paper fiber suspension, in particular a paper fiber suspension obtained from waste paper, which at least one cleaning to remove impurities with at least one flotation, and at least two thickenings, in the filtrates are formed, which follow the purification, wherein the filtrate of a downstream Thickening at least partially re-added before thickening is going upstream the thickening, from which the filtrate comes.
Bekanntlich enthalten Papierfasersuspensionen nicht nur die eigentlichen Papierfasern, sondern auch eine mehr oder weniger große Menge von feinen Feststoffen. Solche feinen Feststoffe können mineralische Füllstoffe sein, die in der Regel zur Papiererzeugung nötig sind. Man nennt sie zumeist „Asche”, da die mineralischen Füllstoffe unbrennbar sind. Es können aber auch Faserbruchstücke sein, die z. B. bei der Mahlung der Fasern entstehen. Diese werden auch Feinstoffe genannt.generally known contain paper fiber suspensions not only the actual paper fibers, but also a more or less large amount of fine solids. Such fine solids can mineral fillers which are usually needed for paper production. They are usually called "ashes" because the mineral fillers are incombustible. It can but also fiber fragments be, the z. B. arise during the grinding of the fibers. These will also called fines.
Wenn aus prozesstechnischen Gründen die Konsistenz der Papierfasersuspension erhöht werden soll, wird sie eingedickt. Dabei gehen nicht nur ein Teil des Wassers, sondern auch ein Teil der feinen Feststoffe in das Filtrat über, weshalb also in der Regel sich das Filtrat aus Wasser, Fein- und Füllstoffen zusammensetzt. Bei der üblichen Prozessführung wird dieses Filtrat dort verwendet, wo an einer stromaufwärts gelegenen Stelle aus prozesstechnischen Gründen die Faserstoffsuspension verdünnt werden muss. Auf diese Weise gehen die feinen Feststoffe zwar nicht verloren, es ist jedoch möglich, dass die Anreicherung von Fein- und Füllstoffen in den Filtraten relativ groß wird. Daher kann diese an sich günstige Methode der Filtratrückführung zu Störungen im Prozessablauf führen. Eine mögliche Abhilfe, um solche Störungen zu vermeiden, liegt darin, die Fein- und Füllstoffe aus dem Kreislauf zu entfernen. So ist es z. B. möglich, eine vorhandene Flotationsanlage so einzustellen, dass sie den Stoff wesentlich stärker entascht als es für das aus der Faser später hergestellte Papier an sich erforderlich ist. Dann steigen aber die Stoffverluste an, die Ausbeute sinkt.If for procedural reasons the consistency of the paper fiber suspension is to be increased, it is thickened. Not only part of the water, but also part of it goes the fine solids in the filtrate, which is why usually the filtrate is composed of water, fillers and fillers. at the usual Litigation becomes this filtrate is used where at an upstream location Job for technical reasons dilutes the pulp suspension must become. This way, the fine solids do not work lost, but it is possible that the accumulation of fines and fillers in the filtrates becomes relatively big. Therefore, this can be favorable in itself Method of filtrate return to disorders in the process flow. A possible Remedy to such disorders to avoid, is the fine and fillers from the circulation to remove. So it is z. Possible, to adjust an existing flotation plant so that it is the substance much more drowsy as it is for that from the fiber later produced paper is required per se. But then rise the material losses, the yield decreases.
Der Erfindung liegt die Aufgabe zu Grunde, Verfahren dieser Art so zu verbessern, dass Ausbeute und Aschegehalt im Fertigstoff einstellbar sind.Of the Invention is based on the object, method of this kind so improve that yield and ash content in the finished product adjustable are.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass der Anteil des Filtrats, welches vor der stromaufwärtigen Eindickung zugegeben wird, einstellbar ist.According to the invention was solved the task by that the proportion of filtrate, which before the upstream thickening is added, is adjustable.
Bei Anwendung des erfindungsgemäßen Verfahrens ergibt sich die Möglichkeit, die bei den Eindickungsschritten anfallenden Filtrate so zu führen, bzw. zu behandeln, dass die darin enthaltenen feinen Feststoffe optimal genutzt werden können. Dabei wird das an sich bekannte Prinzip der Filtratrückwärtsführung noch verbessert. Besondere Vorteile ergeben sich dann, wenn der Rohstoff und damit die Faserstoffsuspension besonders viel Asche enthält, was z. B. bei vielen Altpapiersorten der Fall ist. Dabei sind rohstoffseitig bereits Aschegehalte von 20% oder darüber keine Seltenheit. Bei diesem Verfahren wird also nacheinander mehrmals eingedickt, um die Konsistenz zu erhöhen, wozu in der Regel verschiedene nacheinander geschaltete Apparate verwendet werden. Für die erste Eindickung ist ein Filter, insbesondere ein Scheibenfilter optimal, da zu Beginn der Eindickung eine relativ geringe Konsistenz (ca. 1 bis 3%) vorliegt. Auch eine Siebpresse oder Siebbandpresse kann als Filter verwendet werden. In vielen Fällen wird die dem Filter direkt folgende Eindickung mit besonders ökonomisch arbeitenden Schneckenpressen durchgeführt. Solche Schneckenpressen haben sich bewährt, im Gegensatz zu Filtern oder Siebbandpressen ist bei ihnen der Siebdurchfall jedoch deutlich größer, was gerade bei aschereichen Faserstoffsuspensionen zu einem relativ großen Aschegehalt auch in den gebildeten Filtraten führt.at Application of the method according to the invention results in the possibility to lead the resulting in the thickening filtrates so, or to treat the fine solids contained therein optimally can be used. there the known principle of Filtratrückwärtsführung is still improved. Special Benefits arise when the raw material and thus the pulp suspension contains a lot of ash, what for. B. is the case with many types of waste paper. Here are raw material side already ash contents of 20% or more are not uncommon. In this The process is thus thickened successively several times to ensure consistency to increase, which usually uses different sequential devices become. For the first thickening is a filter, in particular a disc filter optimal, since at the beginning of the thickening a relatively low consistency (about 1 to 3%) is present. Also a screen press or screen belt press can be used as a filter. In many cases, the filter becomes direct following thickening with particularly economical screw presses carried out. Such screw presses have proven themselves, in contrast to filters or sieve belt presses, however, the sieve diarrhea is evident in them bigger, what especially in ash-rich pulp suspensions to a relative huge Ash content also results in the filtrates formed.
Dadurch, dass die Aufteilung des Filtrats der stromabwärtigen Eindickung in zwei Teilströme, welche einerseits vor die stromaufwärts gelegene Eindickung und andererseits vor die Reinigung geführt werden, einstellbar ist, kann die Ausbeute und der Aschegehalt der fertigen Faserstoffsuspension geregelt werden. Soll die Ausbeute und der Aschegehalt im Gutstoff erhöht werden, so wird ein größerer Anteil des Filtrats vor die stromaufwärtige Eindickung geführt. Zur Verminderung wird mehr Filtrat dieser Eindickung vor der Reinigung zugegeben, da in der Reinigung ein relativ großer Anteil von Asche und Kurzfasern verloren geht.Thereby, that the division of the filtrate of the downstream thickening into two partial streams, which on the one hand in front of the upstream thickening and on the other hand before cleaning out, is adjustable, the yield and ash content of the finished Fiber suspension are regulated. Should the yield and the Ash content increased in the accept become a larger share of the Filtrats before the upstream Thickening led. To reduce it is more filtrate this thickening before cleaning added, as in the purification, a relatively large proportion of ash and short fibers get lost.
Nachfolgend wird die Erfindung anhand eines Ausführungsbeispiels näher erläutert. In der beigefügten Zeichnung zeigt die Figur ein Verfahrensschema zur Durchführung des erfindungsgemäßen Verfahrens.following The invention will be explained in more detail with reference to an embodiment. In the attached Drawing shows the figure a process scheme for carrying out the inventive method.
Wie
an sich bekannt, wird eine Faserstoffsuspension dadurch hergestellt,
dass das Papiermaterial P z. B. in Form von Altpapier mit Wasser
W in einer Auflösung
Die
gereinigte Faserstoffsuspension S gelangt direkt nacheinander in
die stromaufwärtige
Eindickung
Die
der Eindickung
Je
mehr Filtrat F3' vor
die stromaufwärtige Eindickung
Nach
der Eindickung
Am
Ende wird die fertige Faserstoffsuspension S in einer Stoffvorlage
In
vielen Stoffaufbereitungsanlagen wird eine Abfolge von Reinigung-
und Bearbeitungsvorgängen
durchgeführt,
wobei man mehrere Bereiche („Loops”) danach
definieren kann, wie die anfallenden Filtrate zirkuliert werden:
Wenn aus prozesstechnischen Gründen
eine Eindickung erfolgt, also Filtrate gebildet werden, werden diese
im Wesentlichen innerhalb desselben Bereiches (Loops) zurückgeführt und
wieder eingespeist. Prinzipiell gelten hier ähnliche Gesichtspunkte, wie
bereits erläutert.
Insbesondere wird das in der stromabwärtigen Eindickung
Claims (18)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200910006308 DE102009006308A1 (en) | 2009-01-27 | 2009-01-27 | Method for treating paper fiber suspension obtained from waste paper, involves recognizing part of filtrate system by upstream thickening, and recognizing another part of filtrate system by cleaner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200910006308 DE102009006308A1 (en) | 2009-01-27 | 2009-01-27 | Method for treating paper fiber suspension obtained from waste paper, involves recognizing part of filtrate system by upstream thickening, and recognizing another part of filtrate system by cleaner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102009006308A1 true DE102009006308A1 (en) | 2010-07-29 |
Family
ID=42282652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE200910006308 Withdrawn DE102009006308A1 (en) | 2009-01-27 | 2009-01-27 | Method for treating paper fiber suspension obtained from waste paper, involves recognizing part of filtrate system by upstream thickening, and recognizing another part of filtrate system by cleaner |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102009006308A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2752413C2 (en) * | 1977-11-24 | 1979-03-29 | J.M. Voith Gmbh, 7920 Heidenheim | Process for hardening the water in waste paper processing and device for carrying out the process |
| EP0615020A1 (en) * | 1993-03-10 | 1994-09-14 | Papierfabrik Utzenstorf Ag | Process for treating waste paper for papermaking |
| DE60025669T2 (en) * | 1999-11-03 | 2006-09-21 | Metso Paper, Inc. | Method for arranging water circuits in an integrated paper mill |
| WO2006123996A1 (en) * | 2005-05-18 | 2006-11-23 | Linde Aktiengesellschaft | Process for deinking recycled fibers and use of an acid in deinking |
| DE102006038866A1 (en) * | 2006-08-18 | 2008-02-21 | Voith Patent Gmbh | Process for treating a paper fiber mixture |
| DE102006057861A1 (en) * | 2006-12-08 | 2008-06-12 | Voith Patent Gmbh | Method for treating a filtrate produced from a paper fiber suspension of waste paper comprises adding the filtrate partly to the paper fiber suspension at a site lying downstream of a thickening units from which the filtrate is produced |
-
2009
- 2009-01-27 DE DE200910006308 patent/DE102009006308A1/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2752413C2 (en) * | 1977-11-24 | 1979-03-29 | J.M. Voith Gmbh, 7920 Heidenheim | Process for hardening the water in waste paper processing and device for carrying out the process |
| EP0615020A1 (en) * | 1993-03-10 | 1994-09-14 | Papierfabrik Utzenstorf Ag | Process for treating waste paper for papermaking |
| DE60025669T2 (en) * | 1999-11-03 | 2006-09-21 | Metso Paper, Inc. | Method for arranging water circuits in an integrated paper mill |
| WO2006123996A1 (en) * | 2005-05-18 | 2006-11-23 | Linde Aktiengesellschaft | Process for deinking recycled fibers and use of an acid in deinking |
| DE102006038866A1 (en) * | 2006-08-18 | 2008-02-21 | Voith Patent Gmbh | Process for treating a paper fiber mixture |
| DE102006057861A1 (en) * | 2006-12-08 | 2008-06-12 | Voith Patent Gmbh | Method for treating a filtrate produced from a paper fiber suspension of waste paper comprises adding the filtrate partly to the paper fiber suspension at a site lying downstream of a thickening units from which the filtrate is produced |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
| R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20130801 |