EP0801989B1 - Procédé de flottation - Google Patents

Procédé de flottation Download PDF

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Publication number
EP0801989B1
EP0801989B1 EP97102625A EP97102625A EP0801989B1 EP 0801989 B1 EP0801989 B1 EP 0801989B1 EP 97102625 A EP97102625 A EP 97102625A EP 97102625 A EP97102625 A EP 97102625A EP 0801989 B1 EP0801989 B1 EP 0801989B1
Authority
EP
European Patent Office
Prior art keywords
flotation
suspension
process according
mixing element
vessel
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 - Lifetime
Application number
EP97102625A
Other languages
German (de)
English (en)
Other versions
EP0801989A1 (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 Paper Fiber Systems GmbH and Co KG
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 Paper Fiber Systems GmbH and Co KG filed Critical Voith Paper Fiber Systems GmbH and Co KG
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 pulp-containing suspension according to the preamble of claim 1.
  • the flotation container according to EP 0 243 690 A in which the Aeration of the suspension already inside the feed pipe into the flotation vessel he follows.
  • the feed pipe is thus designed as a mixing pipe, whereby proposed is to distribute the air in the flowing suspension with the aid of orifices so that a kind of diffuser effect can be achieved again.
  • the invention is therefore based on the object of a flotation process with a better separation effect and / or a lower specific energy requirement create.
  • Better separation means that the amount of unwanted removed Components of the paper pulp suspension is further increased, that is, a better one Cleanliness of the paper pulp is achieved or less fiber loss or both.
  • the momentum exchange in the area of the mixing element is such that the specifically necessary 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 method. It has been shown that a bubble size spectrum in accordance with the requirements, in particular 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 located in the flotation container receives a rotational movement, since a suction which is effective within the flotation container is generated with the aid of the mixing element.
  • the mixing element can have a relatively small mixing volume of at most 5%, based on the suspension volume in the flotation container. It can have a flow channel with a constant flow cross-section that is between 0.001 to 0.05 m 2 in size.
  • the inflow cross section into the mixing element is advantageously 1.5 to 5 times as large as the area of the inlet opening for the suspension in the flotation container.
  • the rotational movement is controlled in such a way that it does not cause flotation can harm. That means: The movement of the gas bubbles to the surface still takes place in the necessary manner instead, since the circulating flow is local to a small part the suspension in the flotation tank is limited. Preferably leaves the suspension the mixing element in approximately horizontal direction, which is also the case with vertical arranged inlet pipe applies.
  • 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 out. 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 is mixed with gas G, for example air, before it enters 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.
  • This distance a is advantageously at most 1 m.
  • 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. In many cases this is a fiber suspension freed from foreign substances or in special cases clarified water, in which the largest possible proportion of all the solids contained has been removed by the flotation.
  • mixing element 3 and the associated inlet element 6 are somewhat more detailed, but still drawn schematically.
  • the collecting space 7 is indicated by dashed lines between the inlet opening 2 and the inflow opening 4.
  • 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 used to regulate the Mixing effect can be changed, especially if the Changing the distance a is difficult. That would be the case with radial flow guidance Case, such as in Fig. 6 and 7.
  • the offset b affects the recirculation of the Suspension within the flotation tank.
  • the arrangement shown in Fig. 2 favors the suction of the suspension above the mixing element due to the offset Third
  • 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 in the container wall lie.
  • the size of the distance a determines the mixing and thus also the Flotation. Therefore, changing them can definitely be used as a control option of the flotation process can be used.
  • 3 is a simple example of this shown, in which the mixing element 3 slidably connected to the inlet element 6 is. This shift can also be done with a motor and the motor as an actuator function of a control loop.
  • the realization of the adjustability is different Wise possible and familiar to the expert.
  • Fig. 4 shows a very special device to use the method with particular simple means to perform.
  • the mixing element 3 forms with the Inlet element 6 one unit.
  • the suction of the already in the flotation tank located suspension takes place through elongated holes upstream from Mixing element 3 are attached.
  • this is also simple Device a distance a between the inlet opening 2 and the inflow opening 4, these openings are indicated here as ovals.
  • Fig. 5 the section through a flotation tank 1 'is shown, which is different 1 of which has an oval cross section.
  • the suspension S 1 in this container is supplied and aerated by an inlet element 6 ', which is a has cylindrical inlet opening.
  • This known per se Flow control has considerable advantages in flotation.
  • the inlet element 6 ' can advantageously, as shown here, eccentrically attached in the flotation tank 1 ' his.
  • the method according to the invention is also in such a flotation device applicable, the mixing element 3 'due to the radial inflow of the suspension is positioned essentially annularly around the inlet opening 2 '.
  • the mixing element has relative to the inlet opening 2 'a height offset. This is not necessary, but can be used to regulate the Mixing in the flotation tank, as already mentioned, can be used.
  • the Mechanical implementation of this adjustment option is not shown here, it is familiar to the expert.
  • the mixing element 3 can also be of the type it is shown in Fig. 7.
  • the suspension S 1 is through the inlet element 6 ' entered vertically into the flotation tank 1, with both the inlet opening 2 " as well as the inflow opening 4 "are horizontal Essentially vertical flow, in which a mixture of the already in the Flotation container suspension S 2 with the newly introduced suspension S 1 takes place.
  • the redirection from the vertical to the horizontal takes place within of the mixing element 3 ′′, which has a correspondingly designed channel.
  • the mixing element 3 "relative to the inlet part 6 ' be slidably arranged 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)

Claims (13)

  1. Procédé de flottation pour séparer les matières solides d'une suspension contenant une pâte à papier, dans lequel on ajoute d'abord en les mélangeant les bulles de gaz destinées à la flottation, puis cette suspension est introduite à travers une ouverture d'entrée (2, 2', 2") dans une récipient de flottation (1, 1'), et la pâte à papier finie (A) épurée est extraite à travers une ouverture de sortie (5), une partie au moins des matières solides se trouvant dans la suspension (1) étant concentrée dans une mousse se formant à la surface, puis évacuée du récipient de flottation (1, 1'), caractérisé en ce qu'au moins la majeure partie de la suspension introduite dans le récipient de flottation (1, 1') est guidée par un élément de malaxage (3, 3', 3") de manière qu'avant d'entrer dans l'élément de malaxage (3, 3', 3"), elle attire une partie de la suspension (S2) se trouvant déjà dans le récipient de flottation (1, 1') et s'écoule avec celle-ci, à travers l'élément de malaxage (3, 3', 3"), à une vitesse de 2 m/s au maximum, tandis qu'il se produit un brassage de ces courants.
  2. Procédé de flottation selon la revendication 1, caractérisé en ce que la traversée de l'élément de malaxage (3, 3', 3") s'effectue à une vitesse de 1 m/s au maximum.
  3. Procédé de flottation selon la revendication 1 ou 2, caractérisé en ce que l'élément de malaxage (3, 3', 3") se trouve à l'intérieur du récipient de flottation (1, 1'), son ouverture d'arrivée (4, 4', 4") se situant à une distance (a) de 1 m au maximum de l'ouverture d'entrée (2, 2', 2").
  4. Procédé de flottation selon la revendication 1, 2 ou 3, caractérisé en ce que le volume de mélange à l'intérieur de l'élément de malaxage (3, 3', 3") représente au maximum 5 % du volume de la suspension dans le récipient de flottation (1, 1').
  5. Procédé de flottation selon l'une des revendications précédentes, caractérisé en ce que la distance (a) entre l'ouverture d'entrée (2, 2', 2") et l'ouverture d'arrivée (4, 4', 4") de l'élément de malaxage (3, 3', 3") est réglable.
  6. Procédé de flottation selon l'une des revendications précédentes, caractérisé en ce que la position de l'élément de malaxage (3, 3', 3") par rapport à l'ouverture d'entrée (2, 2', 2") est réglable transversalement à la direction du courant d'entrée, ce qui fait que l'on peut produire, si on le souhaite, un décalage (b).
  7. Procédé de flottation selon la revendication 5 ou 6, caractérisé en ce que le réglage est modifié pendant le fonctionnement en fonction de valeurs de mesure qui caractérisent l'effet de flottation.
  8. Procédé de flottation selon l'une des revendications précédentes, caractérisé en ce que la suspension (S1) pénètre à l'intérieur du récipient de flottation (1, 1'), en un écoulement horizontal à travers l'ouverture d'entrée (2, 2', 2").
  9. Procédé de flottation selon l'une des revendications 1 à 7, caractérisé en ce que la suspension (S1) pénètre dans le récipient de flottation (1, 1') en un écoulement vertical à travers l'ouverture d'entrée (2, 2', 2").
  10. Procédé de flottation selon la revendication 9, caractérisé en ce que l'écoulement de la suspension dans l'élément de malaxage (3") est dévié de manière qu'il en sorte radialement vers l'extérieur.
  11. Procédé de flottation selon l'une des revendications 1 à 7, caractérisé en ce que la suspension (S1) pénètre dans le récipient de flottation (1') en un écoulement radial horizontal à travers l'ouverture d'entrée (2'), et en ce que l'élément de malaxage (3') est traversé radialement de l'intérieur vers l'extérieur.
  12. Procédé de flottation selon l'une des revendications précédentes, caractérisé en ce que le volume des bulles de gaz destinées à la flottation dans l'élément de malaxage (3, 3', 3") est au plus égal à trois fois le volume de la suspension.
  13. Procédé de flottation selon l'une des revendications précédentes, caractérisé en ce qu'avant d'être introduite dans le récipient de flottation (1, 1'), la suspension (S1) est soumise à une surpression avec le gaz se dissolvant dans celle-ci, et en ce que les bulles de gaz destinées à la flottation se forment par détente consécutive de la suspension.
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 EP0801989A1 (fr) 1997-10-22
EP0801989B1 true 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

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

Families Citing this family (10)

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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
DE102008056506A1 (de) * 2008-11-08 2010-05-12 Voith Patent Gmbh Mischvorrichtung
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

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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
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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
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
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JPH0838806A (ja) * 1994-07-27 1996-02-13 Fsk Corp 油水分離方法

Also Published As

Publication number Publication date
NO971699L (no) 1997-10-20
EP0801989A1 (fr) 1997-10-22
US6129212A (en) 2000-10-10
NO971699D0 (no) 1997-04-14
DE19615089C1 (de) 1997-04-10

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