DE10250762B4 - Process for flotation of impurities from an aqueous pulp suspension - Google Patents
Process for flotation of impurities from an aqueous pulp suspension Download PDFInfo
- Publication number
- DE10250762B4 DE10250762B4 DE2002150762 DE10250762A DE10250762B4 DE 10250762 B4 DE10250762 B4 DE 10250762B4 DE 2002150762 DE2002150762 DE 2002150762 DE 10250762 A DE10250762 A DE 10250762A DE 10250762 B4 DE10250762 B4 DE 10250762B4
- Authority
- DE
- Germany
- Prior art keywords
- foam
- pulp suspension
- flotation
- gas bubbles
- lid
- 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.)
- Expired - Fee Related
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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2405—Feed mechanisms for settling tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2405—Feed mechanisms for settling tanks
- B01D21/2416—Liquid distributors with a plurality of feed points
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2427—The feed or discharge opening located at a distant position from the side walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2433—Discharge mechanisms for floating particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2488—Feed or discharge mechanisms for settling tanks bringing about a partial recirculation of the liquid, e.g. for introducing chemical aids
-
- 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
- B03D1/1443—Feed or discharge mechanisms for flotation tanks
- B03D1/1456—Feed mechanisms for the slurry
-
- 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
- B03D1/1443—Feed or discharge mechanisms for flotation tanks
- B03D1/1462—Discharge mechanisms for the froth
-
- 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
- B03D1/1443—Feed or discharge mechanisms for flotation tanks
- B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
-
- 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
- B03D1/16—Flotation machines with impellers; Subaeration machines
- B03D1/20—Flotation machines with impellers; Subaeration machines with internal air pumps
-
- 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
- B03D1/245—Injecting gas through perforated or porous area
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/12—Prevention of foaming
-
- 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)
- Chemical & Material Sciences (AREA)
- Biotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
Abstract
Verfahren
zur Entfernung von Störstoffen
aus einer wässrigen
Faserstoffsuspension (S),
bei dem mit Hilfe von Gasblasen (1)
ein in der Faserstoffsuspension (S) gegen das Schwerefeld aufsteigender Schaum
(2) gebildet wird,
die Faserstoffsuspension (S) dem Schaum
(2) in einer Zugabezone (4) zugegeben wird,
die Faserstoffsuspension
(S) anschließend
gegen die Steigrichtung des Schaums (2) durch diesen hindurchgeführt wird,
wobei
die Störstoffe
an die Gasblasen (1) angelagert und danach zusammen mit den Gasblasen
(1) in einem verdichteteten Flotationsschaum (3) abgeführt werden
und
wobei die Faserstoffsuspension (S) in gereinigter Form
als Gutstoff (S') abgeführt
wird,
dadurch gekennzeichnet,
dass der verdichtete Flotationsschaum
(3) seitlich an der Zugabezone (4) vorbeigeführt wird und
dass ein
oberhalb der Zugabezone (4) liegender Deckel (9, 9', 9'', 9''')
vorhanden ist.Process for the removal of impurities from an aqueous pulp suspension (S),
in which with the aid of gas bubbles (1) in the pulp suspension (S) against the gravitational field rising foam (2) is formed,
the pulp suspension (S) is added to the foam (2) in an addition zone (4),
the pulp suspension (S) is then passed therethrough against the rising direction of the foam (2),
wherein the impurities are attached to the gas bubbles (1) and then discharged together with the gas bubbles (1) in a compressed flotation foam (3) and
wherein the pulp suspension (S) is removed in purified form as accept (S '),
characterized,
that the compressed flotation foam (3) laterally past the addition zone (4) and
in that a cover (9, 9 ', 9'',9''') lying above the addition zone (4) is present.
Description
Die Erfindung betrifft ein Verfahren zur Flotation von Störstoffen aus einer wässrigen Faserstoffsuspension gemäß dem Oberbegriff des Anspruchs 1.The The invention relates to a process for the flotation of contaminants from an aqueous Pulp suspension according to the preamble of claim 1.
Verfahren der genannten Art werden verwendet, um aus einer wässrigen Faserstoffsuspension zumindest einen Teil der darin suspendierten Störstoffteilchen auszuscheiden. Bekanntlich wird bei einer Flotation ein die auszuscheidenden Stoffe enthaltender Schaum oder Schwimmschlamm gebildet. Ein typischer Anwendungsfall eines derartigen Verfahrens ist die Aufbereitung von einer aus bedrucktem Altpapier gewonnenen wässrigen Faserstoffsuspension, in der die Druckfarbenpartikel bereits von Fasern abgelöst sind, so dass sie sich ausflotieren lassen. Der hier beschriebene Flotationsvorgang nutzt die Unterschiede zwischen Faserstoff und unerwünschten Feststoffteilchen in der Art, dass der Faserstoff auf Grund seiner Hydrophilie in der Faserstoffsuspension verbleibt, während die angesprochenen Feststoffteilchen hydrophob sind und deshalb zusammen mit den Luftblasen in den Schaum gelangen. Neben den Druckfarbenpartikeln gibt es auch eine Vielzahl weiterer Stoffe, die hydrophob sind und sich daher durch Flotation von dem Faserstoff trennen lassen. Solche Stoffe sind insbesondere Kleber, feine Kunststoffpartikel und eventuell auch Harze. Wenn durch das Flotationsverfahren Fasern von Verunreinigungen getrennt, also nicht alle Feststoffpartikel aussortiert werden sollen, spricht man von selektiver Flotation. Der ebenfalls benutzte Begriff "Flotationsdeinking" wird in der Regel nicht nur für die Entfernung von Druckfarbenpartikeln (ink = Druckfarbe) sondern auch allgemeiner für die selektive Flotation von Verunreinigungen aus Faserstoffsuspensionen verwendet. Der Stand der Technik bezüglich Flotationsverfahren für Faserstoffsuspensionen ist bereits sehr weit fortgeschritten. Daher gibt es Lösungen, welche durchaus geeignet sind, einen großen Teil der Feststoffpartikel durch Flotation zu entfernen. Da Flotationsanlagen relativ aufwändig in der Beschaffung und im Betrieb sind, ist es ein verständliches Ziel, deren Effekt zu verbessern oder den notwendigen Aufwand für das Erreichen desselben Ergebnisses zu reduzieren.method of the type mentioned are used to get out of an aqueous Fibrous suspension at least a portion of it suspended contaminant excrete. As is known, in a flotation, the one to be eliminated Substances containing foam or scum formed. A typical one Use case of such a method is the treatment from an aqueous pulp suspension obtained from printed waste paper, in which the ink particles are already detached from fibers, so that they can be floated. The flotation process described here exploits the differences between pulp and unwanted Solid particles in the way that the pulp due to its Hydrophilicity remains in the pulp suspension, while the addressed solid particles are hydrophobic and therefore together get into the foam with the air bubbles. In addition to the ink particles There are also a variety of other substances that are hydrophobic and themselves Therefore, let it separate from the pulp by flotation. Such Substances are in particular adhesives, fine plastic particles and possibly also resins. If by the flotation process fibers of impurities separated, so not all solid particles are to be sorted out, one speaks of selective flotation. The term also used "flotation deinking" is usually not only for the removal of ink particles (ink = ink) but also more general for used the selective flotation of impurities from pulp suspensions. The prior art with respect Flotation process for Pulp suspensions are already very advanced. Therefore are there solutions that are quite suitable, a large part of the solid particles to remove by flotation. Since flotation plants are relatively expensive in of procurement and operation, it is understandable Aim to improve their effect or the necessary effort for achieving it to reduce the same result.
Ein
Verfahren, bei dem die Zugabe der Faserstoffsuspension in den bereits
gebildeten Schaum erfolgt, ist z.B. aus der
In
der
Der Erfindung liegt die Aufgabe zu Grunde, Flotationsverfahren dieser Art weiter zu verbessern Reinigungsergebnis und/oder die Ausbeute des Verfahrens sollen gesteigert werden.Of the The invention is based on the object, flotation of this Type to further improve cleaning performance and / or yield of the process should be increased.
Diese Aufgabe wird durch die Merkmale des Anspruchs 1 und die des Anspruchs 8 in vollem Umfang gelöst.These The object is achieved by the features of claim 1 and claim 8 solved in full.
Da bei Verfahren dieser Art die unbelüftete Faserstoffsuspension in den aufsteigenden Schaum zugegeben wird, trifft sie auf einen bereits gebildeten Luftblasenverbund mit sich dazwischen befindenden Flüssigkeitskanälen. Auf diese Weise wird das Gegenstromprinzip realisiert. D.h., dass die "schmutzigste" Suspension mit den bereits sehr stark beladenen Luftblasen in Kontakt kommt, auf dem Weg nach unten ständig sauberer wird, wobei auch die dann angetroffenen Luftblasen weniger Schmutzfracht tragen. Dieses bekannte und ohnehin schon vorteilhafte Prinzip wird dadurch wesentlich verbessert, dass der aufsteigende verdichtete Schaum in einen Bereich abwandern kann, in dem keine Suspension von oben nachfließt. Dort dickt der Flotationsschaum weiter ein und ist besonders geeignet, die angelagerten Störstoffe zu binden und abzuführen. Das bei der Eindickung ablaufende Schmutzwasser kann im Bedarfsfall gesammelt und separat abgezogen werden.There in processes of this kind, the unaerated pulp suspension is added in the rising foam, she meets one Already formed air bubble composite with intervening fluid channels. On This way, the countercurrent principle is realized. That is, the "dirtiest" suspension with the already very heavily laden air bubbles comes into contact, on the Way down constantly becomes cleaner, whereby also the air bubbles encountered less Wear dirty cargo. This known and already advantageous principle is thereby significantly improved that the ascending condensed Foam can migrate to an area where no suspension flows from above. There the flotation foam continues to thicken and is particularly suitable the accumulated impurities to bind and dissipate. The effluent during thickening dirty water can if necessary collected and deducted separately.
Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen. Dabei zeigen:The The invention and its advantages are explained with reference to drawings. Showing:
In
Das
erfindungsgemäße Verfahren
bietet in speziellen Ausgestaltungen weitere Vorteile. So zeigt die
Wegen
der großen
Anzahl der Luftblasen teilt sich die abwärts gerichtete Strömung unterhalb der
Zugabezone
Nach
erfolgter Reinigung sammelt sich die Faserstoffsuspension unten
in der Flüssigkeitsschicht
Das
erfindungsgemäße Verfahren
kann auch in einer Flotationssäule,
wie in
Je
nach Anforderungen an Ökonomie
und Sauberkeit kann das Schmutzwasser auch in den Zulauf zur Flotationszelle
(gestrichelte Linie
Während in
den
Während die
in den
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002150762 DE10250762B4 (en) | 2002-10-31 | 2002-10-31 | Process for flotation of impurities from an aqueous pulp suspension |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002150762 DE10250762B4 (en) | 2002-10-31 | 2002-10-31 | Process for flotation of impurities from an aqueous pulp suspension |
Publications (2)
Publication Number | Publication Date |
---|---|
DE10250762A1 DE10250762A1 (en) | 2003-11-20 |
DE10250762B4 true DE10250762B4 (en) | 2005-03-17 |
Family
ID=29265446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2002150762 Expired - Fee Related DE10250762B4 (en) | 2002-10-31 | 2002-10-31 | Process for flotation of impurities from an aqueous pulp suspension |
Country Status (1)
Country | Link |
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DE (1) | DE10250762B4 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10359617A1 (en) * | 2003-12-18 | 2005-07-28 | BSH Bosch und Siemens Hausgeräte GmbH | Apparatus and method for filtering particles from a liquid in a dishwashing machine |
DE102004032601A1 (en) * | 2004-07-06 | 2006-02-16 | Voith Paper Patent Gmbh | Process for flotation of impurities from an aqueous pulp suspension |
TWI429745B (en) * | 2007-06-19 | 2014-03-11 | Renewable Algal Energy Llc | Process for microalgae conditioning and concentration |
US11319247B2 (en) * | 2019-10-21 | 2022-05-03 | Rdp Technologies, Inc. | Fine grit classifier |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19823053C1 (en) * | 1998-05-22 | 1999-10-14 | Voith Sulzer Papiertech Patent | Hand-operated sludge removal pump for garden ponds |
DE19905439A1 (en) * | 1999-02-10 | 2000-08-17 | Voith Sulzer Papiertech Patent | Process for removing solids from an aqueous paper fiber suspension |
-
2002
- 2002-10-31 DE DE2002150762 patent/DE10250762B4/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19823053C1 (en) * | 1998-05-22 | 1999-10-14 | Voith Sulzer Papiertech Patent | Hand-operated sludge removal pump for garden ponds |
DE19905439A1 (en) * | 1999-02-10 | 2000-08-17 | Voith Sulzer Papiertech Patent | Process for removing solids from an aqueous paper fiber suspension |
Also Published As
Publication number | Publication date |
---|---|
DE10250762A1 (en) | 2003-11-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAV | Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1 | ||
OP8 | Request for examination as to paragraph 44 patent law | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: VOITH PATENT GMBH, 89522 HEIDENHEIM, DE |
|
8339 | Ceased/non-payment of the annual fee |