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WO2009000345A1 - Procédé de formation de charges, notamment de carbonate de calcium, dans une suspension - Google Patents

Procédé de formation de charges, notamment de carbonate de calcium, dans une suspension Download PDF

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Publication number
WO2009000345A1
WO2009000345A1 PCT/EP2008/001383 EP2008001383W WO2009000345A1 WO 2009000345 A1 WO2009000345 A1 WO 2009000345A1 EP 2008001383 W EP2008001383 W EP 2008001383W WO 2009000345 A1 WO2009000345 A1 WO 2009000345A1
Authority
WO
WIPO (PCT)
Prior art keywords
calcium carbonate
reactor
crystallization
calcium hydroxide
pulp
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.)
Ceased
Application number
PCT/EP2008/001383
Other languages
German (de)
English (en)
Inventor
Klaus Doelle
Reinhard Gather
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
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 WO2009000345A1 publication Critical patent/WO2009000345A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • US 5,223,090 discloses a process employing fibrous material having elongated fibers with a cell wall surrounding a cavity, the fibers having a humidity sufficient to form a dewatered pulp slurry.
  • the fibers have a moisture content corresponding to a proportion of 40 to 50% of the weight of the fibers.
  • the water is essentially present inside the fibers and inside the fiber walls.
  • calcium oxide or calcium hydroxide is added to the pulp so that at least part of the incorporated calcium oxide or calcium hydroxide is associated with the water present in the pulp.
  • the fibrous cellulosic material is combined with carbon dioxide at the same time subjected to a shear mixing process to produce a fiber material with a substantial amount of calcium carbonate on the fiber surface, in the hollow interior and within the fiber walls of the cellulose fibers.
  • This loading of the fibers with fillers has a positive effect on the processes in stock preparation, paper machine and / or further processing.
  • a paper web made of loaded fibers is easier to dewater, for which reason e.g. the machine speed can be increased and / or the press section can be operated with a lower pressing pressure.
  • Another advantage of using this technology is that it can be easily processed in a calender.
  • the field of application of the invention extends to paper and pulp production and process technology, including the filler produced, and includes fields of application of all types of paper, including those resulting from their production, which have a filler content between 1% and 60%.
  • the filler content may be between 5% and 50%.
  • the method it is possible to also produce such calcium carbonate particles, which are larger than usual methods.
  • a crystallization is triggered in which accumulates calcium carbonate around the crystallization nuclei.
  • the calcium carbonate can form clusters. If the process is carried out favorably, the effect of this calcium carbonate addition is driven so far that a complete envelopment of the crystallization nuclei takes place.
  • the crystallization nuclei which can be used here are not necessarily ultrafine particles, as they are usually used for triggering and controlling crystal growth. Rather, it is advantageous that the size of the crystallization nuclei can be adjusted very easily by suitable measures. Since these are added substances, they can first be adjusted to the desired size or the desired size spectrum by selection of the raw materials and then by appropriate treatment, for example milling.
  • the crystallization nuclei suitable for the process can be procured relatively inexpensively, preferably they are negatively charged fines (e.g., dead-milled fiber fragments) or fine contaminants, such as are produced in the stock preparation in front of the paper or board machine anyway. But it can also be e.g. fine wood particles, polyamides, retention aids, anionic starches or anionic salts. In many stock preparation plants, especially when waste paper is processed, there are anyway enough fine-particle-like residues, which often have a disturbing influence on the production or quality of the paper produced. Such particles are e.g. in wash filtrates, rejects on cleaners or sorters, or the filtrates of reject thickening.
  • the starting material used for the process is either a fiber-free water-containing liquid with 0.1 to 30% solids or a pulp suspension if the carbonate is to be produced in the presence of fibers.
  • the liquid is introduced into a reactor together with the crystallization seeds and calcium hydroxide.
  • the addition of gaseous or dissolved carbon dioxide forms calcium carbonate.
  • additional calcium hydroxide or calcium oxide in aqueous and / or solid form may also be mixed into the reactor.
  • the process temperature is between generation of the calcium carbonate + 15 0 C and 130 ° C, in particular between 20 ° and 60 ° C.
  • the formation of the calcium carbonate is preferably carried out in a pressure range between 0.1 and 6 bar, in particular between 1 and 4 bar. There are also higher pressures, e.g. up to 20 bar possible.
  • the average residence time of the substance in the reactor is between 60 seconds and 15 minutes, in particular between 5 and 10 minutes.
  • Fig. 1 is a plant diagram for illustrating the method according to the invention
  • Fig. 2 system diagram for a specific application of the method.
  • a favorable embodiment of the method according to the invention is shown in a plant scheme.
  • Water-containing liquid water W
  • water W Water-containing liquid
  • crystallization seeds 1 calcium hydroxide is liquid or dry, for example, as here in the form of milk of lime (MOL), added to the container 2.
  • MOL milk of lime
  • MOL Kalklösch Surprise 3 is provided. If necessary, the milk of lime can be ground in a grinding device 14, for example a ball or agitator ball mill.
  • the liquid 4 with water, crystallization nuclei and calcium hydroxide is dissolved in pumped a reactor 5.
  • gaseous carbon dioxide CO 2 is added in the reactor 5 .
  • the gas is provided here in a CO 2 supply device 16, wherein it is also possible to heat it in a CO 2 heater 17.
  • a suitable reactor 5 is, for example, a closed container provided with a stirrer 7. Due to the movements of the contents, the reactants can easily come into contact, so that the calcium carbonate-containing filler suspension 6 is formed.
  • the filler suspension 6 enters a finishing unit, e.g. a storage tank 13. In this it can be mixed with an aqueous suspended pulp 12, which comes from the stock preparation plant. The mixture 15 thus formed is then used in another part of the plant not shown here for paper or board production.
  • a finishing unit e.g. a storage tank 13.
  • the mixture 15 thus formed is then used in another part of the plant not shown here for paper or board production.
  • FIG. 2 shows an application of the method in which the crystallization nuclei 1 originate from the wash filtrate of the stock preparation plant for the fiber suspension S1.
  • the latter is shown only in part, namely a hydrocyclone 8, a sorter 9 and a washing device 10.
  • a fine-containing filtrate 11 and a washed-out fibrous material 12 ' are formed in a known manner.
  • the filtrate 11 can be fed directly into the container 2, since it contains fines, which can serve as crystallization nuclei in carrying out the method according to the invention.
  • Addition of calcium hydroxide and processing in the reactor 5 then takes place, for example, similarly as already described and shown in FIG.
  • the pulp 12 ' formed in the washing device 10 can be mixed with the filler suspension 6 produced in the reactor 5, for example in the storage tank 13. In others Cases it is further processed before, for example ground or dispersed; in still other cases, it is used without mixing with the filler suspension 6 on.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

L'invention concerne un procédé de formation de charges, notamment de carbonate de calcium, dans un liquide contenant majoritairement de l'eau, éventuellement également dans une suspension de fibres. Selon ce procédé, de l'hydroxyde de calcium est mis en contact avec du dioxyde de carbone gazeux, du carbonate de calcium étant formé par une réaction chimique. Pendant cette réaction, la formation de particules de grande taille est favorisée par des germes cristallins (1) sous la forme de fines ou de substances anioniques, telles que notamment des sels, des polyamides, des agents de rétention ou des particules d'amidon ou un mélange de ces substances.
PCT/EP2008/001383 2007-06-27 2008-02-22 Procédé de formation de charges, notamment de carbonate de calcium, dans une suspension Ceased WO2009000345A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007029688.8 2007-06-27
DE200710029688 DE102007029688A1 (de) 2007-06-27 2007-06-27 Verfahren zum Bilden von Füllstoffen, insbesondere Calciumcarbonat in einer Suspension

Publications (1)

Publication Number Publication Date
WO2009000345A1 true WO2009000345A1 (fr) 2008-12-31

Family

ID=39642674

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/001383 Ceased WO2009000345A1 (fr) 2007-06-27 2008-02-22 Procédé de formation de charges, notamment de carbonate de calcium, dans une suspension

Country Status (2)

Country Link
DE (1) DE102007029688A1 (fr)
WO (1) WO2009000345A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014174155A1 (fr) * 2013-04-26 2014-10-30 Wetend Technologies Oy Procédé pour alimenter une composition de fabrication d'une bande fibreuse en charge, et papier ou carton
EP3221512A4 (fr) * 2014-11-19 2018-04-25 Stora Enso Oyj Procédé de production d'une charge

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223090A (en) * 1991-03-06 1993-06-29 The United States Of America As Represented By The Secretary Of Agriculture Method for fiber loading a chemical compound
WO2002086238A1 (fr) * 2001-04-24 2002-10-31 M-Real Oyj Charge et son procede de production
US20040108082A1 (en) * 2002-12-09 2004-06-10 Specialty Minerals (Michigan) Inc. Filler-fiber composite
WO2005005726A1 (fr) * 2003-07-15 2005-01-20 Upm-Kymmene Corporation Procede de fabrication de papier et papier
WO2005121447A1 (fr) * 2004-06-11 2005-12-22 Imerys Minerals Limited Traitement de la pate a papier
US20060032596A1 (en) * 2002-10-24 2006-02-16 Markku Leskela Method for producing fiber product

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223090A (en) * 1991-03-06 1993-06-29 The United States Of America As Represented By The Secretary Of Agriculture Method for fiber loading a chemical compound
WO2002086238A1 (fr) * 2001-04-24 2002-10-31 M-Real Oyj Charge et son procede de production
US20060032596A1 (en) * 2002-10-24 2006-02-16 Markku Leskela Method for producing fiber product
US20040108082A1 (en) * 2002-12-09 2004-06-10 Specialty Minerals (Michigan) Inc. Filler-fiber composite
WO2005005726A1 (fr) * 2003-07-15 2005-01-20 Upm-Kymmene Corporation Procede de fabrication de papier et papier
WO2005121447A1 (fr) * 2004-06-11 2005-12-22 Imerys Minerals Limited Traitement de la pate a papier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014174155A1 (fr) * 2013-04-26 2014-10-30 Wetend Technologies Oy Procédé pour alimenter une composition de fabrication d'une bande fibreuse en charge, et papier ou carton
CN105339548A (zh) * 2013-04-26 2016-02-17 芬兰温德造纸湿部技术公司 为制造纤维网的配料提供填料的方法以及纸或纸板
US9708772B2 (en) 2013-04-26 2017-07-18 Wetend Technologies Oy Method of providing fiber web making furnish with filler, and paper or paper board
EP3221512A4 (fr) * 2014-11-19 2018-04-25 Stora Enso Oyj Procédé de production d'une charge
US11193241B2 (en) 2014-11-19 2021-12-07 Stora Enso Oyj Method of producing a filler

Also Published As

Publication number Publication date
DE102007029688A1 (de) 2009-01-02

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