DE102008062197A1 - Flotation method for removing impurities from diluted-fibrous suspension in flotation container, involves subjecting stream of fibrous suspension with compressed air jet during or after supply of gas at preset pressure - Google Patents
Flotation method for removing impurities from diluted-fibrous suspension in flotation container, involves subjecting stream of fibrous suspension with compressed air jet during or after supply of gas at preset pressure Download PDFInfo
- Publication number
- DE102008062197A1 DE102008062197A1 DE200810062197 DE102008062197A DE102008062197A1 DE 102008062197 A1 DE102008062197 A1 DE 102008062197A1 DE 200810062197 DE200810062197 DE 200810062197 DE 102008062197 A DE102008062197 A DE 102008062197A DE 102008062197 A1 DE102008062197 A1 DE 102008062197A1
- Authority
- DE
- Germany
- Prior art keywords
- compressed air
- stream
- flotation
- pulp suspension
- gas
- 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.)
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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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/24—Pneumatic
- B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
-
- 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
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
- D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Biotechnology (AREA)
- Paper (AREA)
Abstract
Description
Die Erfindung betrifft ein Flotationsverfahren zur Entfernung von Störstoffen mit Hilfe von Gasblasen aus einer wässrigen Faserstoffsuspension, wobei einem Strom der Faserstoffsuspension in zumindest einer Mischvorrichtung wenigstens ein Strom von Gas zugeführt und Gasblasen gebildet werden und die Störstoffe in einem Flotationsschaum gesammelt und mit diesem abgeführt werden.The The invention relates to a flotation process for removing contaminants with the aid of gas bubbles from an aqueous pulp suspension, wherein a stream of the pulp suspension in at least one mixing device at least one stream of gas supplied and formed gas bubbles and the impurities collected in a flotation foam and removed with this.
Die Erfindung betrifft auch eine Flotationsvorrichtung zur Entfernung von Störstoffen mit Hilfe von Gasblasen aus einer wässrigen Faserstoffsuspension in einem Flotationsbehälter, welcher zumindest eine, von einem Strom der Faserstoffsuspension durchströmte Mischvorrichtung zur Zuführung wenigstens eines Stromes von Gas aufweist und zumindest eine Ableitung für den gebildeten Flotationsschaum mit den Störstoffen sowie zumindest einen Auslauf für die gereinigte Faserstoffsuspension besitzt, wobei der Strom der Faserstoffsuspension in der Mischvorrichtung durch zumindest einen Strömungskanal geführt wird.The The invention also relates to a flotation device for removal of impurities with the help of gas bubbles from an aqueous pulp suspension in a flotation tank, which at least one mixing device through which a stream of the pulp suspension flows to the feeder at least one stream of gas and at least one derivative for the formed flotation foam with the impurities and at least one outlet for the has purified pulp suspension, wherein the stream of pulp suspension in the mixing device through at least one flow channel guided becomes.
Verfahren und Vorrichtungen der genannten Art sind seit längerer Zeit bekannt und werden insbesondere zur Aufbereitung von Faserstoffsuspensionen eingesetzt, die zumindest teilweise aus Sekundärrohstoffen, vorzugsweise Altpapier, gewonnen werden.method and devices of the type mentioned have been known for some time and become used in particular for the treatment of pulp suspensions, at least partially made of secondary raw materials, preferably waste paper, be won.
Bei dem Flotationsvorgang wird der Umstand genutzt, dass der Faserstoff hydrophil und die Störstoffe oft hydrophob sind. Während der hydrophile Faserstoff in der Suspension verbleibt, gelangen die hydrophoben Störstoffe mit den Flotationsblasen in den Floatationsschaum.at The flotation process uses the fact that the pulp hydrophilic and the impurities often hydrophobic. While the hydrophilic pulp remains in the suspension, the arrive hydrophobic impurities with the flotation bubbles in the floatation foam.
Neben gelösten Druckfarbenpartikeln gibt es insbesondere auch Kleber, Kunststoffpartikel und Harze, die hydrophob sind und so über die Flotation aus der Faserstoffsuspension entfernt werden können.Next dissolved Adhesive particles are also especially adhesive, plastic particles and resins that are hydrophobic and so on the flotation from the pulp suspension can be removed.
Dabei hat sich herausgestellt, dass die Größe der Flotationsblasen einen wesentlichen Einfluss auf die Wirkung des Flotationsverfahrens hat. Große Luftblasen steigen zwar schneller als kleine, können aber weniger oder keine Störstoffe aufnehmen.there it has been found that the size of the flotation bubbles one has a significant influence on the effect of the flotation process. Big bubbles Although faster than small, but less or none impurities take up.
Bei Faserstoffsuspensionen mit relativ hoher Stoffdichte steigen kleine Flotationsblasen oft zu langsam, so dass diese mit der gereinigten Faserstoffsuspension abgeführt werden.at Pulp suspensions of relatively high consistency increase in size Flotation bubbles often too slow, so this with the purified Pulp suspension removed become.
Die Aufgabe der Erfindung ist es daher, die zuverlässige und effektive Entfernung von Störstoffen auch bei relativ hohen Faserstoffdichten von über 1%, insbesondere im Bereich zwischen 1,3 und 3%, zu ermöglichen.The The object of the invention is therefore, the reliable and effective removal of impurities even at relatively high fiber densities of more than 1%, especially in the field between 1.3 and 3%.
Erfindungsgemäß wurde die Aufgabe hinsichtlich des Verfahrens dadurch gelöst, dass während oder nach der Zuführung zumindest eines Stromes von Gas der Strom der Faserstoffsuspension mit wenigstens einem Druckluftstrahl beaufschlagt wird.According to the invention was solved the problem in terms of the method that while or after the feeder at least one stream of gas, the stream of pulp suspension is acted upon with at least one compressed air jet.
Für die Vorrichtung ist wesentlich, dass im Strömungskanal nach der Zuführung zumindest eines Stromes von Gas wenigstens eine Druckluftdüse angeordnet ist, welche einen Druckluftstrahl in den Strom der Faserstoffsuspension richtet.For the device is essential that in the flow channel after the feeder at least one stream of gas arranged at least one compressed air nozzle which is a compressed air jet in the stream of pulp suspension directed.
Durch die Druckluftstrahlen kommt es zu zusätzlichen Turbulenzen im Strom der Faserstoffsuspension. Auf diese Weise kann außerdem die eingebrachte Gasmenge erhöht und die durchschnittliche Größe der Gasblasen vermindert werden. Im Ergebnis verbessert sich das Flotationsergebnis auch bei hohen Faserstoffdichten erheblich.By The compressed air jets cause additional turbulence in the stream the pulp suspension. In this way can also the added amount of gas increased and the average size of the gas bubbles be reduced. As a result, the flotation result improves even at high pulp densities considerably.
Zur Schaffung möglichst vieler Turbulenzen und Unterdruckbereiche ist es vorteilhaft, wenn der Strom der Faserstoffsuspension mit mehreren, in Strömungsrichtung hintereinander und/oder nebeneinander angeordneten Druckluftstrahlen beaufschlagt wird.to Creation possible Many turbulences and negative pressure ranges, it is advantageous if the stream of pulp suspension with several, in the flow direction one behind the other and / or side by side arranged compressed air jets is charged.
Für die Vorrichtung bedeutet dies, dass im Strömungskanal mehrere Druckluftdüsen in Strömungsrichtung hintereinander und/oder nebeneinander angeordnet sind.For the device This means that in the flow channel several compressed air nozzles in the flow direction arranged one behind the other and / or next to each other.
Im Interesse einer Erhöhung der Gasmenge im Strom der Faserstoffsuspension kann es dabei vorteilhaft sein, wenn zwischen zwei, in Strömungsrichtung hintereinander angeordneten Druckluftdüsen wenigstens ein weiterer Strom von Gas in den Strömungskanal geführt wird.in the Interest of an increase The amount of gas in the stream of pulp suspension, it may be advantageous be, if between two, in the direction of flow at least one further one behind the other arranged compressed air nozzles Stream of gas in the flow channel guided becomes.
Außerdem kann es von Vorteil sein, wenn die die Strömungsgeschwindigkeit des Stromes der Faserstoffsuspension vor oder nach der Beaufschlagung über Druckluftdüsen mit Druckluftstrahlen durch Erweiterung des Strömungsquerschnittes bzw. Strömungskanals eventuell vermindert, auf jeden Fall jedoch Raum für die eingebrachte Luft geschaffen wird.In addition, can It may be beneficial if the the flow rate of the stream the pulp suspension before or after the application of compressed air nozzles with Compressed air jets by extension of the flow cross section or flow channel possibly reduced, but definitely room for the introduced Air is created.
Je nach dem Grad der gewünschten oder erforderlichen Verwirblung oder der Größe des Stromes der Faserstoffsuspension sollte an 1 bis 10, vorzugsweise 1 bis 4, Stellen in der Mischvorrichtung Druckluft in den Strom der Faserstoffsuspension eingedüst werden, weshalb auch 1 bis 10, vorzugsweise 1 bis 4, Druckluftdüsen im Strömungskanal angeordnet sein sollten.ever according to the degree of desire or required turbulence or the size of the stream of pulp suspension should be at 1 to 10, preferably 1 to 4, places in the mixing device compressed air be injected into the stream of pulp suspension, which is why 1 to 10, preferably 1 to 4, compressed air nozzles may be arranged in the flow channel should.
Für eine effektive Wirkung der Druckluft ist es dabei von Vorteil, wenn die Druckluftdüsen den Druckluftstrahl senkrecht zur Strömungsrichtung in den Strom der Faserstoffsuspension richten.For an effective effect of the compressed air is It is advantageous if the compressed air nozzles direct the compressed air jet perpendicular to the flow direction in the flow of pulp suspension.
Des weiteren sollte die Druckluft mit einem Druck zwischen 1 und 4 bar in den Strom der Faserstoffsuspension eingedüst werden.Of Further, the compressed air should be at a pressure between 1 and 4 bar be injected into the stream of pulp suspension.
Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden. In der beigefügten Zeichnung zeigt:following the invention will be explained in more detail in several embodiments. In the accompanying Drawing shows:
Gemäß
Die
Mischvorrichtung
In
diesen Strom
Durch
diese intensive Begasung werden in der Faserstoffsuspension
Die
gereinigte Faserstoffsuspension
Im
Unterschied hierzu ist in
Die
Mischvorrichtung
Die
Ableitung
Die
in den
Die
Mischvorrichtung
Zur
Erzeugung von zusätzlichen
Turbulenzen wird über
mehrere Druckluftdüsen
Diese Eindüsung erfolgt mit einem Druck zwischen 2 und 3 bar.These injection takes place with a pressure between 2 and 3 bar.
Bei
der in
Nach
der Begasung und der Querschnittserweiterung werden von mehreren
Seiten des Strömungskanals
Dabei
können
beispielsweise vier Druckluftdüsen
Im
Gegensatz hierzu erfolgt die Begasung in
Die
Druckluftdüsen
Die
jeweils zwischen den Einströmkanälen
Die
Mischvorrichtungen
In
jedem Fall ermöglicht
die Verwirbelung durch die Druckluftstrahlen
Claims (15)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810062197 DE102008062197A1 (en) | 2008-12-13 | 2008-12-13 | Flotation method for removing impurities from diluted-fibrous suspension in flotation container, involves subjecting stream of fibrous suspension with compressed air jet during or after supply of gas at preset pressure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810062197 DE102008062197A1 (en) | 2008-12-13 | 2008-12-13 | Flotation method for removing impurities from diluted-fibrous suspension in flotation container, involves subjecting stream of fibrous suspension with compressed air jet during or after supply of gas at preset pressure |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102008062197A1 true DE102008062197A1 (en) | 2010-06-17 |
Family
ID=42168704
Family Applications (1)
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DE200810062197 Withdrawn DE102008062197A1 (en) | 2008-12-13 | 2008-12-13 | Flotation method for removing impurities from diluted-fibrous suspension in flotation container, involves subjecting stream of fibrous suspension with compressed air jet during or after supply of gas at preset pressure |
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DE (1) | DE102008062197A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5096572A (en) * | 1990-03-12 | 1992-03-17 | Board Of Control Of Michigan Tech. University | Froth flotation |
DE19730464A1 (en) * | 1997-07-16 | 1999-01-21 | Voith Sulzer Stoffaufbereitung | Method and flotation device for removing contaminants from an aqueous fiber suspension |
AT408957B (en) * | 2000-02-03 | 2002-04-25 | Andritz Ag Maschf | METHOD AND DEVICE FOR VENTILATING DISPERSIONS |
US20080251427A1 (en) * | 2007-04-12 | 2008-10-16 | Eriez Manufacturing Co. | Flotation Separation Device and Method |
-
2008
- 2008-12-13 DE DE200810062197 patent/DE102008062197A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5096572A (en) * | 1990-03-12 | 1992-03-17 | Board Of Control Of Michigan Tech. University | Froth flotation |
DE19730464A1 (en) * | 1997-07-16 | 1999-01-21 | Voith Sulzer Stoffaufbereitung | Method and flotation device for removing contaminants from an aqueous fiber suspension |
AT408957B (en) * | 2000-02-03 | 2002-04-25 | Andritz Ag Maschf | METHOD AND DEVICE FOR VENTILATING DISPERSIONS |
US20080251427A1 (en) * | 2007-04-12 | 2008-10-16 | Eriez Manufacturing Co. | Flotation Separation Device and Method |
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OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20130702 |