EP0801989A1 - Procédé de flottation et dispositif pour sa mise en oeuvre - Google Patents

Procédé de flottation et dispositif pour sa mise en oeuvre Download PDF

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Publication number
EP0801989A1
EP0801989A1 EP97102625A EP97102625A EP0801989A1 EP 0801989 A1 EP0801989 A1 EP 0801989A1 EP 97102625 A EP97102625 A EP 97102625A EP 97102625 A EP97102625 A EP 97102625A EP 0801989 A1 EP0801989 A1 EP 0801989A1
Authority
EP
European Patent Office
Prior art keywords
flotation
suspension
inlet opening
mixing element
mixing
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.)
Granted
Application number
EP97102625A
Other languages
German (de)
English (en)
Other versions
EP0801989B1 (fr
Inventor
Jens Dr. Müller
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 Paper Fiber and Environmental Solutions GmbH and Co KG
Original Assignee
Voith Sulzer Stoffaufbereitung 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 Sulzer Stoffaufbereitung GmbH filed Critical Voith Sulzer Stoffaufbereitung GmbH
Publication of EP0801989A1 publication Critical patent/EP0801989A1/fr
Application granted granted Critical
Publication of EP0801989B1 publication Critical patent/EP0801989B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B03D1/02—Froth-flotation processes
    • B03D1/028—Control and monitoring of flotation processes; computer models therefor
    • 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
    • B03D1/1493—Flotation machines with means for establishing a specified flow pattern
    • 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

Definitions

  • the invention relates to a flotation process for separating solids from a paper-containing suspension according to the preamble of claim 1 and a mixing device according to the preamble of claim 17.
  • Methods of this type are e.g. known from DE-OS 34 01 161. They are used in the paper industry for the removal of printing inks, adhesives or other disruptive contaminants, most of which come from waste paper. Due to its hydrophobicity, the fiber is removed as a good substance in the suspension, while the contaminating solids are discarded with the foam. Because of this division of the solid streams into fibers and impurities, one speaks of selective flotation. Other uses of such processes are also known in which as much of the solids as possible is removed by flotation, e.g. in the treatment of waste water generated by pressing in the paper industry. In such cases, one speaks of clarification flotation or, because of the gassing mechanism, relaxation flotation.
  • the object of the invention is therefore to create a flotation process with a better separation effect and / or a lower specific energy requirement.
  • Better separation means that the amount of the undesired constituents of the paper pulp suspension removed is further increased, that is to say a better cleanliness of the pulp or less fiber loss or both.
  • the pulse exchange in the area of the mixing element is such that the specifically required energy dissipation takes place in order to promote the attachment of hydrophobic solid particles to the bubbles. Neither the air bubbles are adversely changed, nor are particles already attached to air bubbles torn off again. Rather, if desired, the bubble size can be better influenced by the process. It has been shown that a bubble size spectrum in accordance with the requirements, especially in fiber suspensions, is difficult to produce or unstable by conventional injectors alone. In the new process, the entire energy conversion takes place under particularly favorable conditions, in particular in comparison to the known injectors, since the speeds can be lower because of the larger volumes involved.
  • the suspension in the flotation container is given a rotational movement because the mixing element generates a suction that is effective within the flotation container.
  • This recirculation movement therefore increases the likelihood that solid particles to be separated can come into contact with the air bubbles entered. This also improves the separating effect of the flotation process.
  • the suction effect described is also suitable for subtracting the vortices which, in the prior art, can arise directly at the mouth of the inlet pipe into the flotation container. These vortices disrupt flotation and waste energy unnecessarily. If they are suctioned off according to the invention, their energy can be used for fumigation and mixing.
  • the rotational movement is controlled so that it cannot damage the flotation. That means: The movement of the gas bubbles to the surface still takes place in the necessary way, since the circulating flow is locally limited to a small part of the suspension in the flotation tank.
  • the suspension preferably leaves the mixing element in an approximately horizontal direction, which also applies to a vertically arranged inlet line.
  • the flotation apparatus contains a flotation container 1 which is not completely drawn. When the method is carried out, this is largely filled with suspension, on the surface of which, as is known per se, a foam 8 is formed which contains as large a part as possible of the components to be flotated. It can flow off via a foam weir as reject R.
  • the suspension S 1 containing paper pulp enters the flotation container 1 through an inlet element 6 having an inlet opening 2. As shown here, it can be mixed with gas G, for example air, before entering the flotation container.
  • the inflowing suspension is passed through a mixing element 3, the inflow opening 4 of which is located at a distance a from the inlet opening 2.
  • part of the suspension S 2 located in the flotation container 1 is sucked into the space between the inlet opening 2 and the inflow opening 4.
  • This space has the Function of a collecting room 7 (Fig. 2).
  • the suspension cleaned by flotation exits the flotation container 1 as accept substance A through the outlet opening 5.
  • this is a fiber suspension freed from foreign matter or in special cases clarified water, in which the largest possible proportion of all the solids contained has been removed by the flotation.
  • FIG. 2 mixing element 3 and the associated inlet element 6 are drawn somewhat more detailed, but still schematically.
  • the collecting space 7 between the inlet opening 2 and the inflow opening 4 is indicated by dashed lines.
  • the mixing element 3 has the extension c.
  • a special feature is the offset b between the center lines of both openings. This offset can be changeable to regulate the mixing effect, especially when it is difficult to change the distance a for constructional reasons. This would be the case with radial flow guidance, such as in FIGS. 6 and 7.
  • the offset b influences the recirculation of the suspension within the flotation container.
  • the arrangement shown in FIG. 2 favors the suction of the suspension above the mixing element 3 due to the offset.
  • the inlet opening 2 is not flush with the wall of the flotation container 1, which can have advantages in flotation.
  • the inlet opening 2 can also be located in the container wall.
  • the bubble-forming gas G is pumped directly through the wall into the flotation tank 1. This variant is also possible with other arrangements.
  • the size of the distance a determines the mixing and thus also the flotation effect. Therefore, changing them can be used as a way to control the flotation process.
  • FIG. 4 A simple example of this is shown in FIG. 4, in which the mixing element 3 is slidably connected to the inlet element 6. This shift can also be done with a motor and the motor as an actuator function of a control loop.
  • the adjustability can be implemented in various ways and is familiar to the person skilled in the art.
  • the mixing element 3 forms a unit with the inlet element 6.
  • the suspension that is already in the flotation tank is sucked in through elongated holes that are arranged upstream of the mixing element 3. In this way, even with this simple device, there is a distance a between the inlet opening 2 and the inflow opening 4, these openings being indicated here as ovals.
  • FIG. 6 shows the section through a flotation container 1 'which, in contrast to that in FIG. 1, has an oval cross section.
  • the suspension S 1 is fed into this container and aerated through an inlet element 6 ', which has a cylindrical inlet opening.
  • the inlet element 6 ' can advantageously, as shown here, be attached eccentrically in the flotation tank 1'.
  • the method according to the invention can also be used in such a flotation device, the mixing element 3 'being positioned essentially in a ring around the inlet opening 2' because of the radial inflow of the suspension.
  • the conditions in the described area of the inlet element 6 ' are shown in somewhat more detail in FIG. 7.
  • the mixing element has a height offset relative to the inlet opening 2 '. This is not necessary, but can be used to regulate the mixing in the flotation tank, as already stated.
  • the mechanical implementation of this adjustment option is not shown here, it is familiar to the person skilled in the art.
  • the mixing element 3 ′′ can also be of the type as it is 8 is shown.
  • the suspension S 1 is entered vertically into the flotation container 1 through the inlet element 6 ', both the inlet opening 2''and the inflow opening 4''being horizontal.
  • the mixing element 3 ′′ which has a correspondingly designed channel.
  • the mixing element 3 ′′ can again be arranged displaceably relative to the inlet part 6 ′ in order to thereby control the flotation process.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • Processing Of Solid Wastes (AREA)
EP97102625A 1996-04-17 1997-02-19 Procédé de flottation Expired - Lifetime EP0801989B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19615089 1996-04-17
DE19615089A DE19615089C1 (de) 1996-04-17 1996-04-17 Flotationsverfahren und Vorrichtung zu seiner Durchführung

Publications (2)

Publication Number Publication Date
EP0801989A1 true EP0801989A1 (fr) 1997-10-22
EP0801989B1 EP0801989B1 (fr) 2003-01-15

Family

ID=7791484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102625A Expired - Lifetime EP0801989B1 (fr) 1996-04-17 1997-02-19 Procédé de flottation

Country Status (4)

Country Link
US (1) US6129212A (fr)
EP (1) EP0801989B1 (fr)
DE (1) DE19615089C1 (fr)
NO (1) NO971699L (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056506A1 (de) * 2008-11-08 2010-05-12 Voith Patent Gmbh Mischvorrichtung

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002239858A1 (en) * 2001-01-10 2002-07-24 Petreco, Inc. Liquid separation process and apparatus for practising same
GB0217807D0 (en) * 2002-08-01 2002-09-11 Axsia Serck Baker Ltd A gas eductor induced gas floation separator
US7267232B2 (en) * 2004-04-30 2007-09-11 The Board Of Trustees Of The University Of Illinois Flotation device and method of froth flotation
DE102006045089A1 (de) * 2006-09-21 2008-03-27 Basf Ag Verfahren zum Durchmischen einer in einem im wesentlichen abgeschlossenen Behälter befindlichen Flüssigkeit oder Mischung aus einer Flüssigkeit und einem feinteiligen Feststoff
DE102008064271A1 (de) * 2008-12-20 2010-07-01 Voith Patent Gmbh Verfahren zur Entfernung von Feststoffen aus einer Fasersuspension durch Flotation sowie Flotationsvorrichtung zu seiner Durchführung
TWI414513B (zh) * 2011-03-01 2013-11-11 Nanya Plastics Corp 一種從苯多羧酸酯氫化成環己烷多羧酸酯的製造方法
JP5790042B2 (ja) * 2011-03-11 2015-10-07 株式会社リコー 粉砕装置および筒状アダプター
CN103506227B (zh) * 2013-09-27 2015-04-29 北京科技大学 一种脉冲喷射式泡沫浮选机
JP2021069993A (ja) * 2019-10-31 2021-05-06 キヤノン株式会社 ウルトラファインバブル生成装置およびその制御方法
CN116427204A (zh) * 2023-05-04 2023-07-14 佛山市高明鸿源纸业有限公司 一种轻型纸生产用流浆箱

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3371779A (en) * 1965-06-24 1968-03-05 Borden Co Concentration of minerals
FR2156375A1 (fr) * 1971-10-14 1973-05-25 Basf Ag
FR2256902A1 (en) * 1974-01-05 1975-08-01 Basf Ag Waste water and sewage treatment - with dissolved oxygen and activated sludge by an ejector
US4490259A (en) * 1982-09-30 1984-12-25 International Resources Management, Inc. Flotation apparatus and process utilizing a novel mixing and floc dispersion means
DE3401161A1 (de) 1984-01-14 1985-11-21 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Flotationsvorrichtung zum flotieren von aus altpapier gewonnener faserstoffsuspension
EP0243690A2 (fr) * 1986-05-02 1987-11-04 J.M. Voith GmbH Cellule ou réservoir de flottation
DE9404986U1 (de) * 1994-03-03 1994-06-30 Menke, Lucas, Dipl.-Ing., 82031 Grünwald Vorrichtung zur Gasblasenflotation

Family Cites Families (12)

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US3722679A (en) * 1970-09-24 1973-03-27 L Logue Method and means for froth flotation concentration utilizing an aerator having a venturi passage
DE2410570C2 (de) * 1974-03-06 1982-04-29 Basf Ag, 6700 Ludwigshafen Vorrichtung zum Ansaugen und Verdichten von Gasen und deren Vermischung mit Flüssigkeit
GB1545559A (en) * 1976-09-09 1979-05-10 Portals Water Treatment Ltd Aeration in a flotation process
US4545892A (en) * 1985-04-15 1985-10-08 Alberta Energy Company Ltd. Treatment of primary tailings and middlings from the hot water extraction process for recovering bitumen from tar sand
HU9202203D0 (en) * 1990-01-29 1992-12-28 Yasuyuki Sakurada Apparatus for purifying sewage water
JPH0657669A (ja) * 1992-08-03 1994-03-01 Iwashina Seisakusho:Kk フローテーター
JPH06128889A (ja) * 1992-10-19 1994-05-10 Iwashina Seisakusho:Kk フローテーターの墨掻き上げ装置
JP2579734B2 (ja) * 1993-11-19 1997-02-12 栄工機株式会社 フローティング形脱墨装置
US5463176A (en) * 1994-01-03 1995-10-31 Eckert; C. Edward Liquid waste oxygenation
DE4407064C1 (de) * 1994-03-03 1995-08-10 Lucas Dipl Ing Menke Vorrichtung zur Gasblasenflotation
DE4416261C1 (de) * 1994-05-07 1995-06-01 Kali & Salz Ag Verfahren und Vorrichtung zur rührerlosen Flotation von Stoffen mit geringem Hydrophobierungsgrad und/oder geringer Stabilität im Schaumverband, insbesondere von Salzgemengen
JPH0838806A (ja) * 1994-07-27 1996-02-13 Fsk Corp 油水分離方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3371779A (en) * 1965-06-24 1968-03-05 Borden Co Concentration of minerals
FR2156375A1 (fr) * 1971-10-14 1973-05-25 Basf Ag
FR2256902A1 (en) * 1974-01-05 1975-08-01 Basf Ag Waste water and sewage treatment - with dissolved oxygen and activated sludge by an ejector
US4490259A (en) * 1982-09-30 1984-12-25 International Resources Management, Inc. Flotation apparatus and process utilizing a novel mixing and floc dispersion means
DE3401161A1 (de) 1984-01-14 1985-11-21 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Flotationsvorrichtung zum flotieren von aus altpapier gewonnener faserstoffsuspension
EP0243690A2 (fr) * 1986-05-02 1987-11-04 J.M. Voith GmbH Cellule ou réservoir de flottation
DE9404986U1 (de) * 1994-03-03 1994-06-30 Menke, Lucas, Dipl.-Ing., 82031 Grünwald Vorrichtung zur Gasblasenflotation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056506A1 (de) * 2008-11-08 2010-05-12 Voith Patent Gmbh Mischvorrichtung

Also Published As

Publication number Publication date
US6129212A (en) 2000-10-10
DE19615089C1 (de) 1997-04-10
NO971699L (no) 1997-10-20
NO971699D0 (no) 1997-04-14
EP0801989B1 (fr) 2003-01-15

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