EP1700953B1 - Procédé pour le nettoyage et recyclage d'une sauce de couchage - Google Patents

Procédé pour le nettoyage et recyclage d'une sauce de couchage Download PDF

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Publication number
EP1700953B1
EP1700953B1 EP05405238A EP05405238A EP1700953B1 EP 1700953 B1 EP1700953 B1 EP 1700953B1 EP 05405238 A EP05405238 A EP 05405238A EP 05405238 A EP05405238 A EP 05405238A EP 1700953 B1 EP1700953 B1 EP 1700953B1
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Prior art keywords
coating
residues
coating colour
mill
grinding process
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EP05405238A
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German (de)
English (en)
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EP1700953A1 (fr
Inventor
Peter Stuffer
Michael Hottmann
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Sappi Alfeld GmbH
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Sappi Alfeld GmbH
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Application filed by Sappi Alfeld GmbH filed Critical Sappi Alfeld GmbH
Priority to ES05405238T priority Critical patent/ES2318441T3/es
Priority to DE502005006055T priority patent/DE502005006055D1/de
Priority to EP05405238A priority patent/EP1700953B1/fr
Priority to AT05405238T priority patent/ATE415519T1/de
Publication of EP1700953A1 publication Critical patent/EP1700953A1/fr
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    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus

Definitions

  • the present invention relates to a process for the purification and in particular the recycling of coating color residues in a paper machine and / or a paper coating machine. Furthermore, the present invention relates to an apparatus for carrying out such a method.
  • coating residues The solids content of these coating residues may vary between 0.5 and 70% dry matter (TS).
  • D1 discloses a method with which a coating color is continuously cleaned on a paper during a coating process and subsequently returned to the coating process.
  • the solution to this problem is achieved in that the coating color residues collected, preferably purified e.g. by filtration, and then subjected to a milling process before being returned to the paper machine and / or coater for use in coating processes.
  • the essence of the invention is thus to remove from the coating color residues the agglomerates, impurities, etc., which are normally produced by the recoating of the coating colors without intermediate processing, using at least one grinding process.
  • the coating of paper can be ensured using thus reclaimed coating residues with significantly higher quality.
  • the coating residues are to a certain extent homogenized and can subsequently be applied to coating units with different coating formulations, without causing problems due to different qualities.
  • all coating residues can be reused without affecting the quality of the papers to be produced and thus raw material costs, energy costs, transport costs and landfill costs are lowered.
  • the grinding is adjusted so that 50-90% of the particles resulting from the milling are smaller than 2 ⁇ m.
  • the coating residue can be reused for a wide range of different strokes.
  • the method can according to another embodiment of the invention find application when coating residues from the continuous operation of the paper machine and / or the coating machine, particularly preferably from different coating units, to be recycled.
  • it can be used when it comes to the coating residues to coat change or revision o.ä. from coating units (the paper machine and / or the coating machine) arising emptying streams and rinsing waters.
  • the process is especially advantageous when the emptying streams and rinsing waters obtained in the coating color residues are coating changes from different coating units with differently formulated coating colors.
  • the process is particularly suitable when the bar formulation is to be changed, since the proposed preparation allows the grain size of the processed material to be adapted to that of the new bar, using and recycling all the effluents and rinse waters from the old formulations can be.
  • the savings to be expected, especially in the case of such changes, are enormous.
  • the method it proves to be advantageous according to a further preferred embodiment of the method to offset the coating color residues before the grinding process with at least one flocculant and / or a dewatering accelerator.
  • These may preferably be polymers, in particular selected from the group of polyacrylamides, polyethyleneimines, polyamines, or derivatives or mixtures thereof.
  • This step is usually followed by a step in which it is concentrated before the milling process. This is particularly preferred for a solids content in the range of 15-25% dry matter.
  • the concentration can be effected by sedimentation, hydrocyclone, belt presses, microfiltration, thermal drying, centrifuging, in a decanter or by a combination or sequence of these methods or devices.
  • the concentrated coating residues are subjected to a grinding process for targeted grain size adjustment and to reduce the visible impurities.
  • pigments in the milling process the clumping of the ground material and the formation of wall deposits in the mill can be problematic, it may prove advantageous to add the coating residues before the grinding process dispersants and / or milling aids.
  • these are, for example, anionic, low molecular weight pigment dispersants, sodium silicates, triisopropanolamine, silica hydrogel, sodium polyacrylates or combinations thereof.
  • the coating color residues are cleaned in a first step, preferably sieved, to separate out coarse impurities or agglomerates. This, for example, by means of a vibrating screen.
  • a mesh size of in the range 50-100 microns preferably in the range of 60-80 microns.
  • a mesh size of 63 ⁇ m can be used concretely become.
  • the grinding process may be carried out in various apparatus capable of reducing such slurries.
  • a tube mill a roll mill, a high-pressure homogenizer, a colloid mill, a kneader, a ball mill, or a macerator. Combinations thereof or sequences (cascades) of different or the same such devices are possible.
  • the coating residues subjected to the grinding process are concentrated. This is done, for example, by adding at least one flocculant and / or one drainage accelerator.
  • flocculant and / or one drainage accelerator may be polymers, in particular selected from the group of polyacrylamides, polyethyleneimines, polyamines, or derivatives or mixtures thereof.
  • the coating color residues are preferably concentrated after such addition of flocculant and / or dehydration accelerator, more preferably to a solids content in the range of 50-70% dry matter.
  • the concentration can be carried out by sedimentation, hydrocyclone, belt presses, microfiltration, thermal drying, centrifuging, in a decanter or by a combination or sequence (cascade) of these methods.
  • the method is particularly advantageous if the ground and optionally concentrated coating color residues in possibly different coating color cycles with differently formulated coating colors are to be recycled, respectively, to be used for the production of coating color for possibly different coating color cycles with differently formulated coating colors.
  • the recycled coating residues are typically not used as the sole component, but the ground and usually concentrated coating residues are in the production of fresh coating colors as part of the recipe in a proportion of 1-50%, particularly preferably in a proportion of 20-30%, especially as a pigment replacement, attached.
  • the present invention relates to an apparatus for performing a method as described above.
  • the device has a collection pit in which the coating residues are collected.
  • it has downstream means for screening, preferably in the form of at least one vibrating screen.
  • it has, before or after this means for screening, via means for dewatering or flocculation, preferably in the form of a flocculation cascade in which the coating residues with flocculant (or dehydrating agent or the like) are added.
  • This unit is followed by or is integrated with means for concentration. This, for example in the form of a unit for sedimentation, centrifuge, decanter or the like ..
  • the device has a mill, particularly preferably in the form of a tube mill, a roll mill, a high-pressure homogenizer, a colloid mill, a kneader, a ball mill, a Macerator or a combination or cascade thereof.
  • a mill particularly preferably in the form of a tube mill, a roll mill, a high-pressure homogenizer, a colloid mill, a kneader, a ball mill, a Macerator or a combination or cascade thereof.
  • means for dewatering or flocculation preferably in the form of a mixing station for dewatering accelerator in which the coating residues are added with dehydrating agent, followed or integrated with concentrating agents, preferably in the form of a decanter.
  • FIG. 1 shows a schematic representation of a coating unit according to the invention, wherein a) represents the first section until just before introduction into the macerator, and b) the second section with macerator and final treatment of the reclaimed coating residues.
  • the method proposed here, or the device suitable for this purpose is characterized in that all coating color residues are collected and mixed, mixed with flocculants and concentrated to a uniform solids content.
  • flocculants both inorganic and organic flocculants can be used.
  • Particularly suitable are polymers such as e.g. Polyacrylamides, polyethylenimines, polyamines.
  • the concentration may e.g. by sedimentation, hydrozyclon, belt pressing, microfiltration, thermal drying or centrifuging.
  • the concentrated mixture is then ground to a defined grain size with the addition of special grinding aids.
  • Tube mills, roller mills, high-pressure homogenizers, colloid mills, kneaders or preferably ball mills can be used for this purpose.
  • the advantage of the process is, among other things, that the special grinding the coating residues including the fine dirt fraction are exactly adapted to the needs of the new coating color and thus independent of the composition the initial coating colors the pore structure of the new stroke can be adjusted.
  • FIG. 1 a device which enables the implementation of such a method. It shows FIG. 1a ) the first section of this device until just before the mill, and FIG. 1b ) the final second section. The two sections are directly connected, and the process begins in FIG. 1 a) on the left edge to the right, to the right edge of the FIG. 1 a) , The right edge of the FIG. 1a ) immediately adjoins the left edge of the FIG. 1b ) and the procedure continues to the right edge of the FIG. 1b ).
  • the device initially has a collection pit 1 when it enters the collection pit 1.
  • the coating color wastewaters 3 of different offline coating machines and the coating color wastewaters 4 of different online coating units can be introduced into this collection pit 1.
  • the solids content in the coating waste water of the paper machine for example, in the range of about 10-100 kg / h otro, in the coating colors wastewater of the coater about 10-20 kg / h otro, in the coating color waste water of the coating color processing about 10-20 kg / h of otro and in the case of coating color wastewaters of the pigment preparation about 100 kg / h otro. It is therefore a mixture with very different solids content.
  • the solids content of the individual entries is in turn very different for the different entries.
  • biocide 2 are substances that kill or impair the effect of bacteria or microorganisms.
  • monitoring systems namely a level measuring LSH / LSL is provided.
  • individual lines via pneumatic valves 12 are adjustable.
  • the collection pit 1 In the collection pit 1, the individual entries are stirred with an agitator and stored temporarily.
  • the collection pit 1 has a capacity of 6000 l.
  • the coating residues are fed via a line 16 to a first process step from the sump 1, namely two parallel vibrating screens 14 and 15. These have mesh with a mesh size of 63 microns, and are equipped with an imbalance drive and with frequency converters SIC and a overfill safety device LSHA provided.
  • the coarse fractions with particle sizes which are larger than the mesh size are retained or rejected in the devices 14 and 15. They are disposed of in the dirt container 13.
  • the two vibrating screens have connections to a fresh water network 7 for setting the process and flushing.
  • the screened coating residues are fed via a line 18 to a transfer container 17, in which the coating residues are stirred with a stirrer 19.
  • the transfer container 17 has a volume of 18m 3 and is also equipped with a frequency converter SIC, with a level measuring device LISHL and with an overfill safety device LSHA.
  • the transfer container 17 has, on the one hand, an outlet with which, if necessary, coating residue residues can be transferred directly to a wastewater collection system 11, but in particular it has an outlet to the line 22, which leads to the next stage in the process.
  • the coating color residues are conveyed in this line 22 via a volumetric pump 21.
  • a volumetric pump 21 the addition of fresh water 20 for adjusting the solids content or viscosity is possible.
  • an automatic flow density measuring device FIQ-DIC is provided in line 22 for controlling the process.
  • flocculant 24 is mixed in a dilution station 25 having a piping mixer 26 to the appropriate concentration, using fresh water from the conduit 7.
  • Flocculants are substances by the addition of the coagulation of collodially dissolved or very finely divided undissolved substances is promoted.
  • calcium hydroxide, iron (II) and aluminum salts are used as flocculants.
  • polymers such as polyacrylamides, polyethyleneimines, polyamines are particularly suitable.
  • the flocculation cascade 23 In the flocculation cascade 23, the actual flocculation after admixture of the flocculant 24 takes place.
  • the flocculation cascade has two stages each with 1500 1 content. In each stage, a stirrer is arranged.
  • Flocculation is a process for treatment and purification in which finely divided (colloidal) substances are converted into larger "flakes" by adding the flocculant (agglomeration). By flocculation and the physical conditions changed thereby (larger particles), a faster sedimentation takes place, whereby then a solid-liquid separation is possible.
  • the selection of the flocculant and if necessary also flocculant is carried out depending on the substances to be separated.
  • the container 27 has 15m 3 content.
  • the outlet of the sedimentation unit 27 has an introduction of fresh water 20, which has a metering station 28.
  • the following line 30 to the reservoir 31 has a volumetric pump with which the coating residues are conveyed. Also in this line 30, an automatic flow density meter FIQ-DIC is provided for controlling the process.
  • the reservoir 31 serves for buffering respectively the intermediate storage and has a volume of 18m 3 . It is designed to absorb the thickened coating residues. Its output is in turn equipped with the possibility to initiate fresh water 20, and the subsequent line 33 leads to actual mill 34 (see FIG. 1b ), which is designed in this case as a ball mill 34 (macerator) with a Mahlraumvolumen of 220 1 and with a Mahlgutvolumen of 100 1, where, for example, a set of Trinex discs (Netzsch, DE) with canned system applies. Macerators are apparatuses for the comminution, homogenization and dispersion of flowable liquid / solid mixtures. The degree of grinding can be adjusted within a range of 2-40 ⁇ m.
  • the output of the ball mill 34 is fed via a line 36 to an intermediate container 35. This can be supplied with stirring fresh water 20 again.
  • the now ground coating residues are fed via a line 47, the content of which is driven via the volumetric pump 37, a next concentration.
  • dewatering accelerator 38 which has been brought to the correct concentration in a dilution station 39, is added to the coating color residues and this mixture is fed to the decanter 40.
  • a decanter also called solid bowl screw centrifuge, serves in the processing for thickening. It works on the principle of tube centrifuges, but has in Ggs. To these a screw which rotates at a low differential rotational frequency to the drum and thereby continuously shears the separated solids from the centrifuge drum and removed from the separation zone. As a result, interruptions in operation, which are caused by the disassembly and cleaning of the drum in the conventional tubular centrifuges avoided. Due to their design, decanters are relatively slow centrifuges, so the separation cut is> 2 ⁇ m for small throughputs.
  • the effect of a retention agent is based on the flocculation of the solid ingredients of a stock suspension. Fines and fillers are integrated into the structure, which improves drainage through an optimal floc structure.
  • the decanter 40 is followed by a dispersing container 45, which on the one hand is charged with dispersant 44, which is controlled by a metering station 41, and which, on the other hand, is charged with sodium hydroxide solution 43 for adjusting the pH, likewise controlled by a metering station 42.
  • the dispersing container 45 has a capacity of 500 l and has an agitator and an electronic weighing device WIQ.
  • the solids content is brought to about 50%.
  • the reclaimed coating residues obtained in this way are fed via line 48 to a storage container 46, where optionally the solids content can be adjusted again via fresh water.
  • the reclaimed coating color can now be metered into the fresh coating colors for the different coating units as a formulation component.

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Claims (19)

  1. Procédé pour la purification et la réutilisation de résidus de sauce de couchage dans une machine à papier et/ou une coucheuse pour papiers,
    dans lequel les résidus de sauce de couchage sont collectés et ensuite soumis à un processus de broyage, avant d'être renvoyés à la machine à papier et/ou à la coucheuse pour l'utilisation dans des processus de couchage.
  2. Procédé selon la revendication 1, caractérisé en ce que 50 à 90 % en poids des particules résultant du broyage sont une taille inférieure à 2 µm.
  3. Procédé selon la revendication 2, caractérisé en ce que pour une réutilisation pour des couches mattes on règle le degré de raffinage de manière que 50-70 % des particules résultant du broyage aient une taille inférieure à 2 µm.
  4. Procédé selon la revendication 2, caractérisé en ce que pour une réutilisation pour des couches brillantes on règle le degré de raffinage de manière que 80-90 % des particules résultant du broyage aient une taille inférieure à 2 µm.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les résidus de sauce de couchage consistent en des résidus de sauce de couchage produits lors du fonctionnement continu de la machine à papier et/ou de la coucheuse, en particulier de préférence provenant de diverses unités de couchage.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les résidus de sauce de couchage consistent en eau de rinçage et courants de vidange en provenance d'unités de couchage, produits lors du changement de la sauce de couchage.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les résidus de sauce de couchage consistent en eau de rinçage et courants de vidange en provenance de différentes unités de couchage, produits lors du remplacement de sauces de couchage par des sauces de couchage formulées différemment.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'avant le broyage on ajoute aux résidus de sauce de couchage au moins un floculant et/ou un accélérateur de déshydratation, qui consistent de préférence en polymères, choisis en particulier dans le groupe des polyacrylamides, des polyéthylène-imines, des polyamines, ou des dérivés ou des mélanges de ceux-ci.
  9. Procédé selon la revendication 8, caractérisé en ce qu'après addition de floculant ou d'accélérateur de déshydratation les résidus de sauce de couchage sont concentrés avant le processus de broyage, en particulier de préférence jusqu'à une teneur en matière solide dans la plage de 15-25 % de matière sèche, la concentration s'effectuant de préférence par sédimentation, au moyen d'un hydrocyclone, pressage sur bande, microfiltration, séchage thermique, centrifugation, dans un décanteur ou par une combinaison ou une séquence de ces procédés.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'avant le processus de broyage on ajoute aux résidus de sauce de couchage des dispersants et/ou des adjuvants de broyage, qui consistent de préférence en dispersants de pigments anioniques de faible masse moléculaire, silicates de sodium, triisopropanolamine, hydrogel de silice, polyacrylates de sodium ou en des associations de ceux-ci.
  11. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que dans une première étape les résidus de sauce de couchage sont tamisés, de préférence sur un tamis vibrant, en particulier de préférence ayant une largeur de maille dans la plage de 50 à 100 µm, encore mieux dans la plage de 60 à 80 µm.
  12. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le processus de broyage est effectué dans un broyeur tubulaire, un broyeur à cylindres, un homogénéisateur à haute pression, un broyeur colloïdal, un malaxeur, un broyeur à boulets, un macérateur ou une combinaison ou une séquence de ceux-ci.
  13. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les résidus de sauce de couchage soumis au processus de broyage, sont concentrés en particulier de préférence avec addition à ceux-ci d'au moins un floculant et/ou un accélérateur de déshydratation, qui consistent de préférence en polymères, choisis en particulier dans le groupe des polyacrylamides, des polyéthylène-imines, des polyamines, ou des dérivés ou des mélanges de ceux-ci.
  14. Procédé selon la revendication 13, caractérisé en ce qu'après addition de floculant et/ou d'accélérateur de déshydratation les résidus de sauce de couchage sont concentrés, en particulier de préférence jusqu'à une teneur en matière solide dans la plage de 40-60 % de matière sèche, la concentration s'effectuant de préférence par sédimentation, au moyen d'un hydrocyclone, pressage sur bande, microfiltration, séchage thermique, centrifugation, dans un décanteur ou par une combinaison ou une séquence de ces procédés.
  15. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'avant et/ou après une concentration ou avant et/ou après le processus de broyage on ajuste la teneur en matière solide par l'addition d'eau d'appoint.
  16. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les résidus de sauce de couchage broyés et éventuellement concentrés sont recyclés dans différents circuits de sauce de couchage à sauces de couchage formulées différemment ou sont utilisés avec des sauces de couchage formulées différemment, pour la préparation de sauce de couchage pour différents circuits de sauce de couchage.
  17. Procédé selon la revendication 16, caractérisé en ce que les résidus de sauce de couchage broyés et concentrés sont envoyés à des circuits de sauce de couchage qui requièrent essentiellement la taille de grain réglée lors du broyage des résidus de sauce de couchage.
  18. Procédé selon la revendication 16 ou 17, caractérisé en ce que les résidus de sauce de couchage broyés et éventuellement concentrés sont introduits dans les circuits de sauce de couchage en une proportion de 1-50 %, en particulier de préférence en une proportion de 20-30 %, en tant que substitut de pigment, ou dans la préparation des sauces de couchage pour des circuits de sauce de couchage, en de telles proportions.
  19. Dispositif pour la mise en oeuvre d'un procédé selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    une fosse collectrice (1) est présente, dans laquelle sont collectés les résidus de sauce de couchage,
    en ce qu'à la fosse collectrice (1) font éventuellement suite des moyens pour le tamisage (14, 15), de préférence sous forme d'au moins un tamis vibrant (14, 15),
    en ce qu'à la suite de cet élément sont placés des moyens pour la déshydratation ou la floculation (23), de préférence sous forme d'une cascade de floculation (23), dans laquelle les résidus de sauce de couchage sont mélangés avec un floculant (24), suivis de moyens ou intégrés avec des moyens destinés à la concentration, de préférence à la sédimentation (27),
    en ce qu'est placé ensuite un broyeur (34), en particulier de préférence sous forme d'une broyeur tubulaire, d'un broyeur à cylindres, d'un homogénéisateur à haute pression, d'un broyeur colloïdal, d'un malaxeur, d'un broyeur à boulets, d'un macérateur ou une combinaison ou une séquence de ceux-ci,
    en ce que sont disposés ensuite des moyens destinés à la déshydratation ou à la floculation (39), de préférence sous forme d'une unité dans laquelle les résidus de sauce de couchage sont additionnés d'un agent de déshydratation (38), suivis de moyens ou intégrés avec des moyens destinés à la concentration, de préférence sous forme d'un décanteur (40),
    et en ce que sont ensuite disposés des moyens (50, 51) destinés à la distribution des résidus de sauce de couchage recyclés sur en particulier de préférence différentes unités de couchage ou sur leurs unités de préparation, ceux-ci étant distribués de préférence sur des unités de couchage qui requièrent une taille de grain qui correspond pratiquement à la taille de grain réglée dans le broyeur (34).
EP05405238A 2005-03-10 2005-03-10 Procédé pour le nettoyage et recyclage d'une sauce de couchage Active EP1700953B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES05405238T ES2318441T3 (es) 2005-03-10 2005-03-10 Procedimiento para la depuracion y reciclado de pinturas de estucado.
DE502005006055T DE502005006055D1 (de) 2005-03-10 2005-03-10 Verfahren zur Reinigung und Wiederverwertung von Streichfarben
EP05405238A EP1700953B1 (fr) 2005-03-10 2005-03-10 Procédé pour le nettoyage et recyclage d'une sauce de couchage
AT05405238T ATE415519T1 (de) 2005-03-10 2005-03-10 Verfahren zur reinigung und wiederverwertung von streichfarben

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Application Number Priority Date Filing Date Title
EP05405238A EP1700953B1 (fr) 2005-03-10 2005-03-10 Procédé pour le nettoyage et recyclage d'une sauce de couchage

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EP1700953A1 EP1700953A1 (fr) 2006-09-13
EP1700953B1 true EP1700953B1 (fr) 2008-11-26

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AT (1) ATE415519T1 (fr)
DE (1) DE502005006055D1 (fr)
ES (1) ES2318441T3 (fr)

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FI97983C (fi) * 1995-03-24 1997-03-25 Jylhaeraisio Oy Sihtausmenetelmä ja sihti
FI103290B1 (fi) * 1997-11-13 1999-05-31 Valmet Raisio Oy Menetelmä ja sovitelma epäpuhtauksien erottelemiseksi päällystysaseman konekierrosta

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