EP1904681A2 - Procede pour charger des fibres contenues dans une suspension de matieres fibreuses - Google Patents

Procede pour charger des fibres contenues dans une suspension de matieres fibreuses

Info

Publication number
EP1904681A2
EP1904681A2 EP06753824A EP06753824A EP1904681A2 EP 1904681 A2 EP1904681 A2 EP 1904681A2 EP 06753824 A EP06753824 A EP 06753824A EP 06753824 A EP06753824 A EP 06753824A EP 1904681 A2 EP1904681 A2 EP 1904681A2
Authority
EP
European Patent Office
Prior art keywords
pulp
calcium hydroxide
pulp suspension
precipitation
dissolution
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.)
Withdrawn
Application number
EP06753824A
Other languages
German (de)
English (en)
Inventor
Lothar Pfalzer
Klaus Doelle
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 EP1904681A2 publication Critical patent/EP1904681A2/fr
Withdrawn legal-status Critical Current

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
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
    • 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 loading fibers contained in a pulp suspension, in particular cellulose fibers for paper or board production.
  • fillers such as precipitated calcium carbonate (PCC) or crushed or ground calcium carbonate (GCC) are common substances used to reduce fiber content and improve the paper's optical properties.
  • PCC precipitated calcium carbonate
  • GCC crushed or ground calcium carbonate
  • PCC or GCC fillers are mass produced in specialized manufacturing plants that may be associated with a paper mill as a satellite facility.
  • PCC on-line production has never been or will be considered in the papermaking industry because of the unique process characteristics required to make PCC.
  • PCC or GCC is transported as bulk material or in the form of a suspension to the paper mills.
  • the loading with an additive can be effected, for example, by a chemical precipitation reaction, ie in particular by a so-called "Fiber Loading TM" process, as described inter alia in US Pat. No. 5,223,090.
  • a chemical precipitation reaction ie in particular by a so-called "Fiber Loading TM" process
  • at least one additive, in particular filler is incorporated on the wetted fiber surfaces of the fiber material.
  • the fibers can be loaded with calcium carbonate, for example.
  • the moist, disintegrated fiber material calcium oxide and / or calcium hydroxide is added so that at least a part thereof associated with the water present in the fiber material.
  • the fiber material treated in this way is then treated with carbon dioxide.
  • the calcium hydroxide medium When the calcium oxide and / or calcium hydroxide medium is added to the pulp suspension, a chemical reaction with an exothermic property takes place, the calcium hydroxide preferably being added in liquid form (lime milk). This means that it is not necessarily necessary for the water to start and run off the chemical reaction possibly in or on the fibers of the pulp suspension or accumulated water.
  • calcium carbonate (CaCO 3 ) may be incorporated into the wetted fiber surfaces by adding calcium oxide (CaO) and / or calcium hydroxide (Ca (OH) 2 ) to the wet fiber material, at least part of which is itself can associate with the water of the pulp amount.
  • the fiber material treated in this way can then be charged with carbon dioxide (CO 2 ).
  • the term "wetted fiber surfaces" can encompass all wetted surfaces of the individual fibers.
  • the fibers are loaded both on their outer surface and in their interior (lumen) with calcium carbonate or any other precipitation product.
  • the fibers can be loaded, for example, with the filler calcium carbonate, wherein the attachment to the wetted fiber surfaces by a so-called “Fiber Loading TM” process takes place, as it is described as such in US-A-5,223,090.
  • the carbon dioxide reacts with the calcium hydroxide to form water and calcium carbonate.
  • the calcium hydroxide may be supplied to the fibers in liquid or dry form.
  • the aim of the invention is to provide a method of the type mentioned, which is more economical than the known methods.
  • cellulose fibers which can be used for paper or board production are suitable. It can be carried out particularly advantageously with chemically produced pulp or with deinked waste paper.
  • the latter material referred to as "dip"
  • the method of the present invention provides the ability to add the calcium oxide (CAO) and / or calcium hydroxide (CAOH 2 ) to the fibrous material in a state where it is relatively highly consistent, eg, air dry or wetted.
  • the fibrous material Before being introduced into the substance solution apparatus and in this, the fibrous material is relatively absorbent, ie the chemicals added there are easier and faster to reach the wetted surface of the fibers. Also, the penetration into the cavities of the fibers is correspondingly faster and cheaper.
  • the dissolving apparatus eg a pulper or a Dissolving drum, in any case liquid, especially water, is added, this process step remains simple and clear. Only a dosage of the calcium oxide or hydroxide is generally required.
  • the dissolving apparatus in such a way that the precipitation of calcium carbonate can already be induced in it by adding at least part of the carbon dioxide to the apparatus. For example, it can be dissolved in the water. Or the dissolving apparatus is temporarily closed and charged with gaseous carbon dioxide. In such cases, a soaking section in front of the dissolution apparatus, in which the calcium hydroxide (lime milk) is sprayed on or added in a softening drum, should be considered.
  • Another advantage of the method according to the invention is that under certain circumstances a thickening machine can be saved, i. that the dissolved pulp is thinned during the dissolution process only so far that the subsequent loading can be carried out.
  • thickening of course, can again be carried out, for example. be required in the form of a screw press.
  • the filtrate of such a thickening would be able to be recycled in a short cycle directly into the dissolving apparatus, ie serve there for dilution.
  • This has the distinct advantage that the calcium hydroxide or calcium oxide is used optimally, so that not only the water, but also the chemicals can be recirculated.
  • Figure 1 shows the inventive method in schematic form.
  • Fig. 2 shows a specific embodiment of the method for processing printed waste paper
  • Fig. 3 is a simplified illustrated system diagram for carrying out the method according to the invention.
  • Fig. 1 shows that in carrying out the process the pulp P, which is e.g. Waste paper or fresh pulp can be processed in the resolution 1.
  • the pulp suspension S is added in this example as lime 7 at the dissolution, which, for example. is provided by deleting lime in the lime milk production 5.
  • the pulp suspension S may be passed through a cleaning system, not shown here, in which e.g. Heavy parts and plastic or other filth is removed. Whether this is necessary depends mainly on the quality of the raw material. Possibly then thickening 2 can take place, but this is not always necessary and was therefore shown in dashed lines.
  • the filtrate 9 of the thickening 2 is used for dissolution 1.
  • the process step of precipitation 3 of fines, in particular calcium carbonate is triggered by the addition of gaseous carbon dioxide 8, which originates from a carbon dioxide production 6.
  • the thus prepared pulp suspension S ' can then be used for paper production 4, wherein in general a number of further processing steps not shown here are required.
  • white water is obtained, which is excellently suitable for being reused partly as return water 9 ' at dissolution 1.
  • return water 9 ' As a result, not only is the water reused, but also the unused calcium hydroxide contained therein.
  • a pulp suspension S obtained by dissolution 1 of printed waste paper is treated by a flotation process 31 in such a way that the ink particles and optionally further fine impurities are removed as rejects 32. Even then, at the resolution 1, the previously customary sodium hydroxide can be replaced by calcium hydroxide in the dissolution.
  • FIG. 3 shows by way of example a system with the most important method steps and devices.
  • the pulp P is entered together with water W in a pulper 10.
  • This pulper 10 may be of conventional construction, ie contain a pulper screen 11 in its bottom area, as well as a pulper rotor 12, which ensures the circulation in the pulper and keeps the pulper screen 11 free of blockages.
  • the pulp thus dissolved is fed to a plurality of cleaning devices, symbolically represented as a fabric cleaner 14 and a fabric sorter 15. It then follows a screw press 16 to raise the consistency of the pulp suspension again.
  • the press filtrate 18 of the screw press 16 can advantageously be returned to the dissolution in the pulper 10.
  • the thickened pulp 19 then passes into a crystallizer 20, which serves to initiate the desired precipitation of calcium carbonate in the form of finely divided filler with the aid of supplied carbon dioxide gas 24.
  • the carbon dioxide gas is provided by a carbon dioxide supply 21 and can be brought in a heat exchanger 22 by means of a cooling or heating means 23 to the desired temperature. But there are other possibilities for temperature control, for example, the direct addition of steam, if an increase in temperature is appropriate. If necessary, a portion of the carbon dioxide gas 24 'may also be added after the crystallizer 20 by means of a mixing device 25 to complete the loading process.
  • the loaded pulp suspension is collected, possibly diluted with dilution water 27 and is then available as a pulp suspension 28 a paper machine 29 available.
  • the plant part shown in Fig. 3 for loading with fillers, in particular calcium carbonate, is to be regarded only as a simplified example. In many cases, a bleach can be integrated. More details on the implementation of the load can be seen from the publications mentioned above.
  • the loading process is advantageously operated as an online process in the paper mill.
  • At least one of the following devices and / or means can be used for the online process: HC cleaner, static mixer, lime fining device, press, in particular screw press or belt press, equalizing reactor, crystallizer, further static mixer, CO 2 supply unit. direction or additional CO 2 recovery unit, optional CO 2 heater, optional chemical bleach additive, press water tank.
  • crystalline precipitate product particles has the advantage, among other things, that, as far as necessary, higher gloss values can be achieved for the end product.
  • the press filtrate 9 is at least partially used in the crystallizer 20 as dilution water.
  • the mixing device 25 may be a static mixer and in particular for fine adjustment of the pH of the pulp suspension, preferably in a range between 6 and 8, are used.
  • At least a portion of the required CO 2 is provided by a CO 2 recovery system. So it can be recovered, for example, from the flue gas of boilers or the flue gas of power plants.
  • a CO 2 recovery system for example, precipitate product particles of a rhombohedral shape having a respective cube size in a range of about 0.05 to about 2 ⁇ m can be produced.
  • precipitate product particles of a scalenohedral form having a respective length in a range of about 0.05 to about 2 ⁇ m and a respective diameter in a range of about 0.01 to about 0.05 ⁇ m to create.
  • the solids concentration of the pulp suspension provided for precipitation is selected in a range from about 5 to about 60% and preferably in a range from about 10 to about 35%.
  • the carbon dioxide is added to the pulp suspension at a temperature in a range of about -15 to about 120 ° C., and preferably in a range of about 20 to about 90 ° C.
  • the paper produced can therefore contain fillers of the order of about 0.05 to about 5 ⁇ m, which increases the optical properties of the final product.
  • the filler may in particular be calcium carbonate, which occurs in nature, for example, as calcite or calcite, aragonite and in the rarer form Vaterit.
  • the filler may consist mainly of the form of calcite, of which over 300 different crystal forms are said to exist.
  • the shape of the filler particles used may, for example, be rhombohedral with a respective cube size in a range of about 0.05 to about 2 ⁇ m or, for example, scalenoedric with a respective length in a range of about 0.05 to about 2 ⁇ m and a respective diameter in a range of about 0.01 to about 0.05 ⁇ m, depending on the type of paper to be produced.
  • the filler is well distributed on and around the fibers, meaning that there is no agglomeration of crystals in bundles.
  • the particular filler particle, namely the crystal is individually spaced or singulated on the fiber.
  • the filler particle covers the fiber by attachment to the fiber, thereby improving the optical properties of the final product.
  • the particle size is therefore essential for achieving optimum opacity.
  • High opacity is achieved when the color spectrum of visible light is well dispersed. If the color spectrum is absorbed, the color is black. If the size of the filler particles falls below 0.2 to 0.5 ⁇ m, there is a tendency for transparency and higher gloss.
  • the process for producing the filler crystals may be as follows and may have the following variables:
  • the pulp suspension previously mixed with Ca (OH) 2 becomes the crystallizer 20, for example, into a fluffer, refiner, disperser or the like at a consistency or solids concentration in a range of about 5 to about 60%, preferably in a range of about 10 to about 35%, given.
  • the pulp suspension is charged with CO 2 .
  • the CO 2 can z. B. at temperatures in a range be added between about -15 and about 120 0 C and preferably at temperatures in a range between about 20 and about 90 0 C.
  • the pulp suspension enters the gas zone of the crystallizer 20, where each individual fiber is exposed to a gaseous atmosphere, followed by the precipitation reaction which immediately yields the CaCO 3 .
  • the shape of the CaCO 3 crystals can be, for example, rhombohedral, scalenohedral or spherical, with the amount of crystals in particular depending on the selected temperature range for the pulp suspension and on the CO 2 and Ca (OH) 2 content in the pulp suspension.
  • a shear distribution occurs which entails a size distribution of the crystals of from about 0.05 to about 0.5 ⁇ m, and preferably from about 0.3 to about 2.5 ⁇ m.
  • the shape of the filler particles used is, for example, rhombohedral with a respective cube size in a range of about 0.05 to about 2 / im or scalenoedric with a respective length in a range of about 0.05 to about 2 ⁇ m and a respective diameter in one Range from about 0.01 to about 0.5 ⁇ m, depending on the type of paper to be produced.
  • the concentration of fiber pulp passing through the rotor disk is from about 0.1 to about 50% and preferably from about 35 to about 50%.
  • the pressure applied to the CO 2 feed line is in a range of about 0.1 to about 6 bar, and preferably in a range of about 0.5 to about 3 bar, to provide a constant CO 2 supply to the gas ring for the desired one to ensure chemical reaction.
  • the pressure is to be increased in case of high water demand in order to convey more through the hose. Since CO 2 is a compressible gas, the required amount can also be increased to ensure a complete reaction.
  • the CO 2 supply and thus the CaCO 3 -producing precipitation reaction can be controlled and / or regulated via the pH.
  • pH values in the range of 6.0 to about 10.0 pH, preferably in the range of about 7.0 to about 8.5, pH can be envisaged for the final reaction of the CaCO 3 crystals.
  • the energy used for this process may be in a range between about 0.3 and about 8 kWh / t, and preferably in a range between about 0.5 and about 4 kWh / t.
  • Dilution water may be added and mixed with the pulp suspension to obtain a final dilution in which the resulting pulp suspension with filler has a consistency or solids concentration in the range of, for example, about 0.1 to about 16%, preferably in the range of about 2 to about 6%.
  • the pulp suspension is then exposed to the atmosphere in a machine, a container or the next process machine.
  • the rotational speed of the rotor disk may be on the outer diameter, in particular in a range of about 20 to 100 m / s and preferably in a range of about 40 to about 60 m / s.
  • the gap between rotor and stator is, for example, about 0.5 to about 100 mm, and preferably about 25 to about 75 mm.
  • the diameter of the rotor and the stator may be in a range of about 5 to about 2 m.
  • the reaction time is preferably in a range of about 0.001 to 1 minute, preferably in a range of about 0.1 to about 10 seconds.
  • the process described above enables the production of individual particles equally spaced and attached to the fibers, covering the fibers in the manner required to meet the requirements for the desired high level of white or glossy paper.
  • the particle size is preferably in a range from about 0.05 to about 5 ⁇ m, with the preferred size for the rhombohedral shape of a cube being in a range of about 0.05 to about 2 ⁇ m, or for a scalenohedral shape in length a range of about 0.05 to about 2 microns and in diameter in a range of about 0.01 to about 0.5 ⁇ m.
  • the particle size should desirably be below 0.2 to 0.5 ⁇ m.

Landscapes

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

Abstract

L'invention concerne un procédé servant à charger une suspension de matières fibreuses (S) en carbonate de calcium. Ce procédé consiste à ajouter p. ex. de l'hydroxyde de calcium liquide, tel que du lait de chaux (7), pendant ou avant la dissolution (1) mise en oeuvre pour former la matière fibreuse. L'introduction de dioxyde de carbone gazeux (8) dans la suspension de matières fibreuses ainsi traitée déclenche, dans cette dernière, une réaction chimique pendant laquelle du carbonate de calcium finement divisé est précipité. Grâce à l'ajout précoce d'oxyde de calcium ou d'hydroxyde de calcium, ledit procédé est particulièrement économique et efficace.
EP06753824A 2005-07-12 2006-05-24 Procede pour charger des fibres contenues dans une suspension de matieres fibreuses Withdrawn EP1904681A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005032383 2005-07-12
PCT/EP2006/004922 WO2007006368A2 (fr) 2005-07-12 2006-05-24 Procede pour charger des fibres contenues dans une suspension de matieres fibreuses

Publications (1)

Publication Number Publication Date
EP1904681A2 true EP1904681A2 (fr) 2008-04-02

Family

ID=37637514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06753824A Withdrawn EP1904681A2 (fr) 2005-07-12 2006-05-24 Procede pour charger des fibres contenues dans une suspension de matieres fibreuses

Country Status (5)

Country Link
US (1) US20080210391A1 (fr)
EP (1) EP1904681A2 (fr)
CN (1) CN101208476A (fr)
CA (1) CA2614813A1 (fr)
WO (1) WO2007006368A2 (fr)

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PL3617400T3 (pl) 2009-03-30 2023-01-02 Fiberlean Technologies Limited Zastosowanie zawiesin nanofibrylarnej celulozy
SI2236545T1 (sl) 2009-03-30 2014-12-31 Omya International Ag Postopek za proizvodnjo gelov iz nanofibrilirane celuloze
GB0908401D0 (en) 2009-05-15 2009-06-24 Imerys Minerals Ltd Paper filler composition
FI124831B (fi) * 2010-03-10 2015-02-13 Upm Kymmene Oyj Menetelmä ja reaktori kalsiumkarbonaatin in-line-valmistamiseksi paperimassavirtaukseen
FI122304B (fi) * 2010-04-22 2011-11-30 Nordkalk Oy Ab Happaman veden käyttö paperinvalmistuksessa
ES2464733T3 (es) 2010-04-27 2014-06-03 Omya International Ag Proceso para la producción de materiales compuestos a base de gel
PT2386682E (pt) 2010-04-27 2014-05-27 Omya Int Ag Processo para fabricar materiais estruturados, usando géis de celulose nanofibrilares
FI125826B (fi) * 2010-08-04 2016-02-29 Nordkalk Oy Ab Menetelmä paperin tai kartongin valmistamiseksi
FI125278B (fi) * 2010-08-20 2015-08-14 Upm Kymmene Corp Menetelmä kalsiumkarbonaatin saostamiseksi sekä menetelmän käyttö
GB201019288D0 (en) 2010-11-15 2010-12-29 Imerys Minerals Ltd Compositions
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JP6661644B2 (ja) * 2015-09-08 2020-03-11 日本製紙株式会社 炭酸マグネシウム微粒子と繊維との複合体、および、その製造方法
ES2741514T3 (es) 2015-10-14 2020-02-11 Fiberlean Tech Ltd Material laminado conformable en 3D
ES2857512T3 (es) 2016-04-05 2021-09-29 Fiberlean Tech Ltd Productos de papel y cartón
US11846072B2 (en) 2016-04-05 2023-12-19 Fiberlean Technologies Limited Process of making paper and paperboard products
BR112018070846B1 (pt) 2016-04-22 2023-04-11 Fiberlean Technologies Limited Fibras compreendendo celulose microfibrilada e métodos de fabricação de fibras e materiais não tecidos a partir das mesmas
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Also Published As

Publication number Publication date
CN101208476A (zh) 2008-06-25
CA2614813A1 (fr) 2007-01-18
US20080210391A1 (en) 2008-09-04
WO2007006368A2 (fr) 2007-01-18
WO2007006368A3 (fr) 2007-05-31

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