WO2005014929A1 - A method and a device for precipitating calcium carbonate in a fibre material - Google Patents

A method and a device for precipitating calcium carbonate in a fibre material Download PDF

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Publication number
WO2005014929A1
WO2005014929A1 PCT/FI2004/000445 FI2004000445W WO2005014929A1 WO 2005014929 A1 WO2005014929 A1 WO 2005014929A1 FI 2004000445 W FI2004000445 W FI 2004000445W WO 2005014929 A1 WO2005014929 A1 WO 2005014929A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibre material
defibrator
mixing zone
carbon dioxide
consistency
Prior art date
Application number
PCT/FI2004/000445
Other languages
English (en)
French (fr)
Inventor
Matti SIPILÄ
Original Assignee
Upm-Kymmene Corporation
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 Upm-Kymmene Corporation filed Critical Upm-Kymmene Corporation
Priority to DE112004001436T priority Critical patent/DE112004001436T5/de
Priority to GB0601623A priority patent/GB2421516B/en
Publication of WO2005014929A1 publication Critical patent/WO2005014929A1/en

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Classifications

    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately

Definitions

  • the invention relates to a method for precipitating calcium carbonate in a fibre material, which is of the type presented in the preamble of the appended claim 1.
  • the invention also relates to a device for implementing the method.
  • Publication WO 02/072945 discloses a method wherein calcium hydroxide and/or calcium oxide are first supplied to the fibre suspension, and the thus processed suspension is compressed into a plug with a conveyor screw in a conically tapered channel, after which it is dispersed with a dispersing device between two discs located perpendicular in relation to the channel. One of the discs is fixed and one rotating. Carbon dioxide is supplied to the final end of the plug and/or to the input area of the dispersing device and/or to the central, radially inner area of the dispersing device. The dispersing device is at the same time used as a precipitation reactor for calcium carbonate.
  • An advantageous decrease in the concentration of fibre suspension during the radial conveyance performed by the dispersing device is from 35 % to approximately 4 % according to the publication. This means that dilution water must be supplied to the dispersing device in order to reach this suitably low final consistency.
  • the purpose of the invention is to overcome the above-mentioned drawbacks and to provide a new method for the continuous manufacture of calcium carbonate filled fibres for paper manufacturing.
  • the method according to the invention is primarily characterized in what will be presented in the characterizing part of the appended claim 1.
  • Carbon dioxide is directed to cellulose-based fibres, to which calcium hydroxide has previously been impregnated, after which said fibres are processed in 3 to 5 % concentration in a defibrator, which can be a known processing device that disperses fibre bundles.
  • a defibrator which can be a known processing device that disperses fibre bundles.
  • a defibrator In this kind of a defibrator there are grooves and ridges alternately in the rotation direction in the opposite surfaces, which rotate in relation to each other, i.e. blades between which the mixing zone for processing fibres is formed.
  • the fibres in the mixing zone drift between opposite ridges and travel via larger spaces formed by opposite grooves, by being simultaneously exposed to hydraulic cutting forces.
  • a blade gap in the mixing zone in question is in the range of 0.5 to 1.5 mm.
  • the mixing zone forms a ring-like space expanding in its diameter in the supply direction of the fibre material.
  • Fig. 1 shows a continuous pulp processing line in a schematic view
  • Fig. 2 shows a pulp treatment line according to a second embodiment
  • Fig. 3 shows a pulp processing line according to a third embodiment
  • Fig. 4 shows a defibrator functioning as a precipitation reactor in a cross-section.
  • Fig. 1 shows a schematic view of a pulp processing line wherein the invention can be used.
  • Lime milk (calcium hydroxide) is supplied continuously in the flow direction of pulp taken from a storage tank before the defibrator to the pulp flow in as high as possible dry solids content at point A, where the consistency of the pulp is between 3 to 5 %.
  • the pH of the pulp rises approximately to the value of 11 to 12.
  • the pulp fibres swell.
  • Lime milk is manufactured in situ without storage by continuously forming a slurry of calcium oxide in water. This is described with tank S in the graph of Fig. 1.
  • carbon dioxide is continuously added to the pulp flow after the lime milk addition point A at point B, which achieves the precipitation of calcium carbonate in fibres according to a known reaction.
  • the addition of carbon dioxide at point B at the same time decreases the pH of pulp back to a normal level.
  • the pulp is supplied to the defibrator C, where the actual reaction takes place.
  • the input of carbon dioxide takes place at a point where the consistency of pulp is 3 to 5 %, in which consistency the pulp is supplied to the defibrator.
  • the fibre suspension is forced between the blades moving in relation to each other in such a manner that the fibres alternately drift between the ridges in opposite blades, and through these gaps have access to larger areas, which are in the grooves next to said ridges.
  • the ridges are directed transversely in relation to the direction of rotation of the blades in order for the above- mentioned alternation to be possible during one cycle.
  • the processing in the above-mentioned manner can be implemented in known jumbo defibrators or the like, where the blades implementing the relative movement are formed of a rotor rotating around the axis and a fixed stator located coaxially in relation to this axis.
  • the ring-like space between the blades and perpendicular to the rotation axis which space has a certain tooth-like profile because of the above-mentioned ridges and which forms a mixing zone in order to get the fibre pulp impregnated with calcium hydroxide and carbon dioxide to react with each other, travels further from the rotation axis in the supply direction because of the conical form of the blades, i.e.
  • the blade distance (the distance between the ridges of the opposite blades i.e. the rotor and the stator) is in this kind of defibrators typically at its minimum 0.5 mm, and the purpose of the defibrator is to disintegrate fibre knots (flocks) and not to refine fibres.
  • the carbon dioxide used which is directed to the pulp flow, is advantageously 100 % gas.
  • An advantage in the use of the above-described defibrator is that while the fibre bundles are dispersed between the blades in a low consistency (3 to 5 %), the growth of the formed calcium carbonate into too large particles can be prevented.
  • the calcium carbonate can remain attached to the fibre in small nano-size crystals with capillary forces and Van der Waals forces.
  • the equivalent diameter (ESD) of the particles is advantageously between 40 to 100 nm.
  • Fig. 2 shows an advantageous manner to precipitate calcium carbonate in fibres.
  • the pulp can be directed in a consistency of 2 to 5 % to the first defibrator C1 , before which the carbon dioxide is added to the pulp flow. After this defibrator and before the second defibrator C2, more carbon dioxide is added to the pulp flow.
  • the first defibrator C1 and the second defibrator 02 which are connected in series, function as sequential precipitation reactors in order to precipitate nano-sized particles.
  • the pulp flow coming out of the second defibrator can be processed in yet a third defibrator C3, where an effective mixing is achieved and it is ensured that all the fibres are processed.
  • At least two defibrators sequentially in series in such a manner that they are after at least one addition point of carbon dioxide. With this it is ensured that as many fibres as possible are in touch with carbon dioxide.
  • carbon dioxide is supplied in two sequential points before the corresponding defibrator.
  • lime milk can be added at point A to pulp flow, where the consistency is greater than in defibrator C. Between point A and the carbon dioxide addition point B, dilution into processing consistency of 3 to 5 % is performed for the pulp.
  • the lime milk can be added, for example, into pulp travelling in a discharge screw of a disc filter F or other pulp concentrating device, the concentration of which pulp is over 10 %.
  • auxiliary pulp also comes to the precipitating device, which also ends up in the discharge screw. After the discharge screw the pulp is directed to adilution tank T, where it is diluted to the processing consistency of 3 to 5 %, and after that to the carbon dioxide addition point B and the defibrator 0.
  • Fig. 4 shows the defibrator C in a cross section. All the defibrators of Figs. 1 to 3 can be provided with this structure, especially those defibrators that are after the supply point of carbon dioxide. Fibre pulp is supplied to the defibrator in the direction of rotation of the rotor.
  • the outer surface of the rotor and the inner surface of the stator are conical in their general form, and they form the above-mentioned processing zone Z between each other, which widens in its diameter in the supply direction, which zone is formed in a ring-like manner in the cross section plane perpendicular to the rotation axis of the rotor.
  • the blade distance in zone Z is in the range of 0.5 to 1.5 mm.
  • the zone Z can be formed of sequential subzones Z1 , Z2 and Z3, through which the fibre material travels sequentially.
  • the blade distances diminish stepwise in the supply direction in such a manner that in the first subzone Z1 the distance is 1.5 mm, in the second subzone Z2 1.0 mm and in the third subzone Z30.5 mm.
  • the subzones can be directed in the axial direction in a low-gradienter angle in relation to the rotation axis than the common conical form.
  • the subzones Z1, Z2, Z3 are located stepwise in relation to each other in such a manner that between two sequential subzones there is passage in the radial direction, via which the pulp being handled transfers to the next subzone.
  • Fig. 4 also shows how carbon dioxide can be supplied directly to the casing that is before the blades in the flow direction of pulp (processing zone Z).
  • the supply of carbon dioxide shown in Figs. 1 to 3 is implemented advantageously in this manner, i.e. the supply taking place before the discharge is in this case supply to the chamber before the zone Z.
  • the ridges of the same blade surface are substantially parallel and the ridges of the opposite blades are advantageously slightly crosswise, i.e. in a small angle towards each other in relation to the axial direction (direction of the rotation axis).
  • a suitable raw material for the method is especially chemical pulp. After refining this pulp, which can be, for example, softwood and/or hardwood pulp, such as pine and/or birch pulp, only a part of the pulp can be processed as described above, and the remaining part is processed in a normal manner.
  • Wood-free fine paper is manufactured of the pulp processed according to Figs. 1 or 2, the fibres of which paper contain nano-sized calcium carbonate, the concentration of which is advantageously 20 to 40 wt-% of the dry weight of the paper.
  • the paper contains normal fillers, for example normal calcium carbonates (GCC and/or PCC), which are added separately to the fibre raw material of the paper.
  • the total concentration of mineral filler in this type of paper can be 20 to 40 wt-%, a part of which is nano-sized calcium carbonate precipitated in the fibres.
  • the pulp provided by the defibrator or defibrators connected in series and filled with calcium carbonate can be used either as the only pulp raw material of paper, in which case it is not mixed with other fibres, or it can be mixed with other raw material fibres of paper in the mixing tank.
  • the fibre pulp manufactured according to the invention is used in manufacturing multilayer paper by forming at least one surface layer of paper from it while the core layer is formed of other fibre pulp.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

Menetelmässä kalsiumkarbonaatin saostamiseksi selluloosapohjaiseen kuitumateriaaliin kalsiumyhdistettä johdetaan ensiksi kuitumateriaaliin, minkä jälkeen tähän kuitumateriaaliin johdetaan hiilidioksidia ja materaalia sekoitetaan kalsiumkarbonaatin saostamiseksi kuituihin. Hiilidioksidia johdetaan kuitumateriaaliin, joka on 3-5 % sakeudessa, minkä jälkeen kuitumateriaali syötetään tällä sakeusalueella sekoitusvyöhykkeen (Z) läpi ja saatetaan kyseisellä sekoitusvyöhykkeellä hydraulisten leikkausvoimien alaiseksi kuiduttimessa (C; C1, C2), jonka terävälys mainitulla vyöhykkeellä (Z) on alueella 0,5-1,5 mm.
PCT/FI2004/000445 2003-08-06 2004-07-12 A method and a device for precipitating calcium carbonate in a fibre material WO2005014929A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112004001436T DE112004001436T5 (de) 2003-08-06 2004-07-12 Verfahren und Vorrichtung zum Ablagern von Kalziumkarbonat in einem Fasermaterial
GB0601623A GB2421516B (en) 2003-08-06 2004-07-12 A method and a device for precipitating calcium carbonate in a fibre material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20031134 2003-08-06
FI20031134A FI120462B (fi) 2003-08-06 2003-08-06 Menetelmä ja laitteisto kalsiumkarbonaatin saostamiseksi kuitumateriaaliin

Publications (1)

Publication Number Publication Date
WO2005014929A1 true WO2005014929A1 (en) 2005-02-17

Family

ID=27838821

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2004/000445 WO2005014929A1 (en) 2003-08-06 2004-07-12 A method and a device for precipitating calcium carbonate in a fibre material

Country Status (4)

Country Link
DE (1) DE112004001436T5 (fi)
FI (1) FI120462B (fi)
GB (1) GB2421516B (fi)
WO (1) WO2005014929A1 (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8808503B2 (en) * 2009-02-02 2014-08-19 John Klungness Fiber loading improvements in papermaking

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016116650A1 (de) 2016-09-06 2018-03-08 Papiertechnische Stiftung Compound mit einer Trockenmasse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020092636A1 (en) * 2000-07-13 2002-07-18 Voith Paper Patent Gmbh Process and device for loading fibers with calcium carbonate
WO2003006740A1 (en) * 2001-07-11 2003-01-23 Voith Paper Patent Gmbh Method of loading a fiber suspension with calcium carbonate
US20030094252A1 (en) * 2001-10-17 2003-05-22 American Air Liquide, Inc. Cellulosic products containing improved percentage of calcium carbonate filler in the presence of other papermaking additives

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020092636A1 (en) * 2000-07-13 2002-07-18 Voith Paper Patent Gmbh Process and device for loading fibers with calcium carbonate
WO2003006740A1 (en) * 2001-07-11 2003-01-23 Voith Paper Patent Gmbh Method of loading a fiber suspension with calcium carbonate
US20030094252A1 (en) * 2001-10-17 2003-05-22 American Air Liquide, Inc. Cellulosic products containing improved percentage of calcium carbonate filler in the presence of other papermaking additives

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8808503B2 (en) * 2009-02-02 2014-08-19 John Klungness Fiber loading improvements in papermaking

Also Published As

Publication number Publication date
FI120462B (fi) 2009-10-30
GB2421516A (en) 2006-06-28
FI20031134A (fi) 2005-02-07
DE112004001436T5 (de) 2006-06-14
GB2421516B (en) 2007-04-18
FI20031134A0 (fi) 2003-08-06
GB0601623D0 (en) 2006-03-08

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