DE2336914A1 - Grinding moist coarse pulp residue - derived from mechanical prodn. of wood pulp - Google Patents
Grinding moist coarse pulp residue - derived from mechanical prodn. of wood pulpInfo
- Publication number
- DE2336914A1 DE2336914A1 DE19732336914 DE2336914A DE2336914A1 DE 2336914 A1 DE2336914 A1 DE 2336914A1 DE 19732336914 DE19732336914 DE 19732336914 DE 2336914 A DE2336914 A DE 2336914A DE 2336914 A1 DE2336914 A1 DE 2336914A1
- Authority
- DE
- Germany
- Prior art keywords
- prodn
- pulp
- wood pulp
- residue
- grinding
- 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.)
- Pending
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
Description
Wässerige Fasersuspensionen mit Wassergehalten über 80 % werden in der Papierfabrikation seit langem in Mahlaggregaten verschiedener Bauart zum Zwecke der Zerkleinerung behandelt. Üblich sind hierzu sogenannte Refiner. Diese Mahlmaschinen sind nicht in der Lage, den Spuckstoff aus der Holzschleiferei so gut zu zermahlen, daß er in der Feinpapierproduktion wieder zugesetzt werden kann. Im teereich der Feinpapier-Produktion galt der Spuckstoff bislang als unverwertbarer Abfall. Er wurde deshalb in die Produktion minderwertiger Sorten (z. B. Pappe) gegeben oder belastete die Kläranlage bzw. bei deren Fehlen den Vorfluter.Aqueous fiber suspensions with water contents above 80 % have long been treated in paper production in various types of grinding units for the purpose of comminution. So-called refiners are common for this. These grinding machines are not able to grind the reject from the wood grinding shop so well that it can be added again in the fine paper production. In the fine paper production area, rejects were previously considered unusable waste. It was therefore used in the production of inferior types (e.g. cardboard) or polluted the sewage treatment plant or, in the absence of it, the receiving water.
Innerbetriebliche Versuche zur Zermahlung Ton Spuckstoff in Korundscheibenmühlen und Kollergängen befriedigten teils vom Verfahren, teils vom Ergebnis her nicht.In-house attempts to grind up clay rejects in corundum disk mills and pan mills were partly satisfactory in terms of the process and partly unsatisfactory in terms of the result.
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Der in Anspruch 1 angegebenen Erfindung liegt die Aufgabe zugrunde, den Spuckstoff für die Feinpapier-Produktion verwertbar zu machen.Entgegen dem seitherigen Stand der Technik wird erfindungsgemäß die Aufmahlung feuchten Spuckstoffes unterschiedlichen Wassergehaltes in seither nicht üblichen Feuchtebereichen und mit einer in der Papierfabrikation nicht üblichen Mühlentypen durchgeführt» Es werden Spuckstoffe verringertem Vassergehalts eingesetzt und eine Pralltellermühle verwendet« *The invention specified in claim 1 is based on the object of the rejects for fine paper production In contrast to the prior art since then, according to the invention, the Grinding of moist rejects with different water content in areas of humidity that have not been used since then and carried out with a type of mill that is not common in paper production »There are rejects reduced water content and an impact plate mill used «*
In praxisgleichen Großversuchen wurde eine Abhängigkeit der Mühlenleistung hinsichtlich Durchsatz, Mahlfeinheit und Faserverteiltng vom Wassergehalt des Mahlgutes gefunden. Im allgemeinen stellten sich die besseren Mahlbedingungen bei den niedrigeren Feuchtegehalten ein. Doch ist die wirtschaftlichste Methode abhängig von der Summe der Kosten für die benötigte Entwässerungsarbeit (Sieb, Filter, Presse, Trockner) und die Mahlarbeit.In large-scale tests similar to practice, a dependency of the mill output with regard to throughput and grinding fineness was found and fiber distribution found from the water content of the ground material. In general, the better ones presented themselves Grinding conditions at the lower moisture contents. However, the most economical method depends on the Sum of the costs for the required dewatering work (sieve, filter, press, dryer) and the grinding work.
Wirtschaftliches Optimum muß nicht mit geringstem Wassergehalt zusammenfallen» Eä ergab sich, daß die Mahlung eines Spuckstoffes mit 20 °/o Wassergehalt sehr befriedigende Mahlgüte und Mahlleistung erbrachte. Aber auch beiEconomic optimum does not coincide with the lowest water content "Eä was found that the grinding yielded a reject material with 20 ° / o water content very satisfactory Mahlgüte and grinding performance. But also with
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35 $igem Stoff, d.h. Wassergehalt von 65 0Jo1 war noch befriedigende Mahlwirkung festzustellen. Innerhalb des Bereiches von 70 - 20 % Wassergehalts liegt erfahrungsgemäß das wirtschaftliche Optimum.35 $ strength material, ie water content of 65 0 1 Jo was seen still satisfactory grinding effect. Experience has shown that the economic optimum lies within the range of 70 - 20 % water content.
Die teilweise Entwässerung des Spuckstoffes, wie sie für das Verfahren nach Anspruch 1 notwendig ist, kann durcl bekannte Entwässerungsgeräte wie Bogensieb, Banddruckfiltei Schneckenpressen oder Wirbelschichttrockner erfolgen.The partial drainage of the rejects, like them is necessary for the method according to claim 1, can bycl known dewatering devices such as curved sieve, belt pressure filter Screw presses or fluidized bed dryers take place.
Das Verfahren nach Anspruch 2 hat zum Zweck, daß die produktionsbedingt in einem Holzschliff, der auf Steinen erschliffen wurde, enthaltenen Steinteilchen, insbesondere die aus dem Mineral Korund bestehenden und nicht durch Magneten abtrennbaren Verunreinigungen, vom Spuckstoff abgetrennt werden. Durch diese Separation soll die Standzeit der Mahlgarnituren der Pralltellermühlen im Sinne einer Steigerung der Wirtschaftlichkeit des Verfahrens verlängert werden.The method according to claim 2 has the purpose that the production-related stone particles contained in a wood pulp that was ground on stones, in particular the impurities consisting of the mineral corundum and cannot be separated by magnets, from the rejects be separated. This separation should increase the service life of the grinding sets of the impact plate mills in the sense an increase in the economic efficiency of the process.
Die Qualität des nach obigem Verfahren gemahlenen Schleiferei-Spuckstoffes hat der Faseranalyse nach den Charakter eines Holzschliff-Feinstoffes mit einem geringen Gehalt an Faserlangstoff und ganz erheblich reduziertem Gehalt anThe quality of the grinding rejects ground according to the above procedure According to the fiber analysis, it has the character of a wood pulp fines with a low content of Long fiber pulp and a significantly reduced content of
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dem schädlichen Splitterstoff. Das gemahlene Gut läßt sich problemlos vor die Holzschliff-Sortierung rezyklieren,the harmful fragmentation material. The ground material can be easily recycled before sorting the wood pulp,
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Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732336914 DE2336914A1 (en) | 1973-07-20 | 1973-07-20 | Grinding moist coarse pulp residue - derived from mechanical prodn. of wood pulp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732336914 DE2336914A1 (en) | 1973-07-20 | 1973-07-20 | Grinding moist coarse pulp residue - derived from mechanical prodn. of wood pulp |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2336914A1 true DE2336914A1 (en) | 1975-03-06 |
Family
ID=5887495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19732336914 Pending DE2336914A1 (en) | 1973-07-20 | 1973-07-20 | Grinding moist coarse pulp residue - derived from mechanical prodn. of wood pulp |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2336914A1 (en) |
-
1973
- 1973-07-20 DE DE19732336914 patent/DE2336914A1/en active Pending
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