EP0622122B1 - Flotationszelle mit einem Injektor - Google Patents

Flotationszelle mit einem Injektor Download PDF

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Publication number
EP0622122B1
EP0622122B1 EP94103560A EP94103560A EP0622122B1 EP 0622122 B1 EP0622122 B1 EP 0622122B1 EP 94103560 A EP94103560 A EP 94103560A EP 94103560 A EP94103560 A EP 94103560A EP 0622122 B1 EP0622122 B1 EP 0622122B1
Authority
EP
European Patent Office
Prior art keywords
pipe
screen
flotation cell
diameter
holes
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
EP94103560A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0622122A1 (de
Inventor
Gerhard Veh
Peter Schweiss
Hans-Dieter Dörflinger
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0622122A1 publication Critical patent/EP0622122A1/de
Application granted granted Critical
Publication of EP0622122B1 publication Critical patent/EP0622122B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23121—Diffusers having injection means, e.g. nozzles with circumferential outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/2366—Parts; Accessories
    • B01F23/2368—Mixing receptacles, e.g. tanks, vessels or reactors, being completely closed, e.g. hermetically closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/305—Injector mixers the additional component being axially fed and radially discharged through a circumferential outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4323—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa using elements provided with a plurality of channels or using a plurality of tubes which can either be placed between common spaces or collectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4521—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through orifices in elements, e.g. flat plates or cylinders, which obstruct the whole diameter of the tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • 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
    • B03D1/1481—Flotation machines with a plurality of parallel plates
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/75—Flowing liquid aspirates gas

Definitions

  • the invention relates to a flotation cell with at least one injector according to the preamble of claim 1.
  • a flotation cell is known from the publication "5 years of operating experience with pneumatic flotation in hard coal processing" by A. Bahr, K. Legner, H. Lüdke, FW Mehrhoff in Aufleungstechnik, 28 (1987) pp. 1 - 9.
  • the cell disclosed in this document is characterized by a sectioned tubular body, with the suspension from a central tube entering each individual section with the aid of a funnel-shaped opening, resulting in a laminar suspension flow results.
  • Another such cell is disclosed in EP-A-0277327.
  • the diaphragm is located within a feed tube of the flotation cell for the suspension, specifically at the beginning of a mixing tube section of this feed line. Shortly after the orifice - that is to say downstream - air supply slots are provided in the mixing tube section, and distributed over its circumference. In this case, practically only one arrangement makes sense in which the openings (holes) of the diaphragm are close to the circumference of the same. This is not a very effective arrangement. Attempts have also been made to increase the small throughput of the orifice described by an arrangement with a multiple injector according to DE-A-36 34 903. Here too, the way of working is accompanied by insufficient effectiveness due to the distribution among the different injectors - each of which is designed with its own mixing tube.
  • the object of the invention is to provide a flotation device with an injector which works at very high throughput quantities, ie air bubbles are distributed in the suspension in a sufficiently large quantity.
  • Each hole of the diaphragm is preferably assigned its own premix tube section in order to achieve the best possible air intake. This high amount of air should be mixed well with the suspension due to high turbulence in the premixing tube.
  • FIG. 1 shows in principle a cross section through a flotation cell with the injector according to the invention
  • FIG. 3 shows a top view of this and in particular the diaphragm
  • FIG. 4 shows another diaphragm arrangement.
  • the flotation cell according to FIG. 1 has a housing 20 which is essentially oval in cross section and into which it is eccentric - that is to say in the vicinity of a narrow side the same - an injector 1 is inserted, which ends about 50 - 100 cm below the suspension level.
  • This level is set by means of a weir 22 which can be adjusted by means of the adjusting rod 25 and over the overflow edge of which the foam containing dirt flows out into the foam channel 21 together with a certain proportion of the suspension.
  • the suspension is preferably gassed with air.
  • the vertical feed tube 6 of the injector has an orifice 2 which is provided with through openings in the form of round holes 3 which are distributed uniformly over the circumference of the orifice (see FIG. 3).
  • each hole 3 is followed by a pipe section 7 of small diameter, which serves as a premixing section.
  • the distance between the diaphragm and the pipe section 7 preferably has a value between 0.15 times and 1.5 times the hole diameter.
  • the length of the small pipe sections 7 is preferably 4 to 10 times their inner diameter or at least 0.8 times the inner diameter of the mixing pipe section 6 'connected downstream of the orifice, which in turn has approximately the same diameter as the outer diameter of the orifice 2.
  • the injector preferably has a continuous tube as the outer wall. However, at its end there is a radial diffuser 4 with a base plate 5, which leaves a gap 15 with respect to the tube 6 ', which is approximately 7-14% of the diameter of the mixing tube 6'.
  • the average flow velocity to the orifice can be set at about 2 m / s, so that due to the geometric conditions shown, a flow velocity behind the orifice holes of 12.5 m / s and after the premixing tubes 7 of about 4.5 m / s s results.
  • the outflow speed from the radial diffuser 4 is then about 2.2 m / s. But this is just an example.
  • the air is sucked in through the pipe sections 7, which act as small injectors, in a pipe section 9 of the supply line, which is connected downstream of the diaphragm. This has at least one air connection.
  • a valve can be switched on here to control the amount of air sucked in. It is favorable if the pipe sections 7 protrude at least 10 mm from the air intake section 9.
  • the aperture holes do not need to be exactly circular, as does the cross section of the pipe sections 7, e.g. a relatively even polygon or an ellipse is possible.
  • the inside diameter of the small pipe sections should be at least 10% larger than the diameter of the holes in the panel.
  • FIG. 4 shows that a different, approximately uniform distribution of the holes in the diaphragm can also be provided as in FIGS. 2 and 3.
  • the number of holes in the aperture must be limited to 16, since a larger number of holes has hardly any advantages.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Nozzles (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
EP94103560A 1993-03-26 1994-03-09 Flotationszelle mit einem Injektor Expired - Lifetime EP0622122B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4309918 1993-03-26
DE4309918A DE4309918C2 (de) 1993-03-26 1993-03-26 Flotationszelle mit einem Injektor

Publications (2)

Publication Number Publication Date
EP0622122A1 EP0622122A1 (de) 1994-11-02
EP0622122B1 true EP0622122B1 (de) 1997-06-04

Family

ID=6483968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94103560A Expired - Lifetime EP0622122B1 (de) 1993-03-26 1994-03-09 Flotationszelle mit einem Injektor

Country Status (11)

Country Link
US (1) US5465848A (enrdf_load_stackoverflow)
EP (1) EP0622122B1 (enrdf_load_stackoverflow)
JP (1) JP3423404B2 (enrdf_load_stackoverflow)
KR (1) KR940021110A (enrdf_load_stackoverflow)
AT (1) ATE153881T1 (enrdf_load_stackoverflow)
BR (1) BR9400883A (enrdf_load_stackoverflow)
CA (1) CA2119936C (enrdf_load_stackoverflow)
DE (1) DE4309918C2 (enrdf_load_stackoverflow)
FI (1) FI113748B (enrdf_load_stackoverflow)
NO (1) NO301968B1 (enrdf_load_stackoverflow)
TW (1) TW237390B (enrdf_load_stackoverflow)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783118A (en) * 1997-07-02 1998-07-21 Kolaini; Ali R. Method for generating microbubbles of gas in a body of liquid
AT408957B (de) * 2000-02-03 2002-04-25 Andritz Ag Maschf Verfahren und vorrichtung zum belüften von dispersionen
US6394279B1 (en) 2000-06-16 2002-05-28 Voith Sulzer Paper Technology North America, Inc. Flotation machine for a fiber suspension and method of using same
US6395131B1 (en) 2000-09-19 2002-05-28 Voith Sulzer Paper Technology North America, Inc. Flotation machine for a fiber suspension and method of using same
KR100781820B1 (ko) * 2001-02-21 2007-12-03 시부야 코교 가부시키가이샤 기체액체 혼합류의 분사장치
AT411155B (de) † 2002-03-27 2003-10-27 Andritz Ag Maschf Vorrichtung zum abtrennen von feststoffen aus flüssigkeiten mittels flotation
ES2283158B1 (es) * 2003-11-10 2008-09-16 Universidad De Sevilla Procedimiento y dispositivo para la generacion de espumas y emulsiones mediante pares de tubos enfrentados.
AU2005309332B2 (en) * 2004-11-26 2006-11-09 The University Of Queensland Improvements to a fluid jet flotation apparatus
CA2594278A1 (en) * 2004-11-26 2006-06-01 The University Of Queensland Improvements to a fluid jet flotation apparatus
FI122973B (fi) * 2005-06-17 2012-09-28 Metso Paper Inc Flotaatiokennon injektori, flotaatiokennon injektorin suutinosa ja menetelmä kuitususpensiovirtauksen ja ilman sekoittamiseksi toisiinsa flotaatiokennon injektorissa
FI119554B (fi) 2005-10-10 2008-12-31 Metso Paper Inc Flotaatiokennon injektorin diffuusori
US7562777B1 (en) 2006-06-12 2009-07-21 Narayanasamy Seenivasan Flotation cell injector assembly for use with open or closed flotation deinking modules for recycled paper
US7537674B1 (en) 2006-06-12 2009-05-26 Narayanasamy Seenivasan Closed floatation de-inking module for recycled paper
US7544271B1 (en) 2006-06-12 2009-06-09 Narayanasamy Seenivasan Open flotation de-inking module for recycled paper
FI119598B (fi) * 2007-04-05 2009-01-15 Metso Paper Inc Flotaatiokennon injektori
FI119998B (fi) * 2007-04-05 2009-05-29 Metso Paper Inc Kuitususpensiovirtauksen syöttäminen flotaatiokennoon ja flotaatiokennon injektori
US8771520B2 (en) * 2008-05-31 2014-07-08 Vws Westgarth Limited Fluid treatment apparatus
DE102008056506A1 (de) * 2008-11-08 2010-05-12 Voith Patent Gmbh Mischvorrichtung
DE102008064270A1 (de) * 2008-12-20 2010-07-01 Voith Patent Gmbh Verfahren und Vorrichtung zur Flotation einer wässrigen Faserstoffsuspension
DE102009011046A1 (de) * 2009-02-28 2010-09-02 Voith Patent Gmbh Flotationsvorrichtung
DE102009045965A1 (de) * 2009-10-23 2011-04-28 Voith Patent Gmbh Verfahren zur Entfernung von Feststoffen aus einer Faserstoffsuspension durch Flotation
JP6042061B2 (ja) * 2011-10-12 2016-12-14 Ｊｆｅエンジニアリング株式会社 噴霧ノズル、該噴霧ノズルを用いた流体微粒化装置
JP5912393B2 (ja) * 2011-10-12 2016-04-27 Ｊｆｅエンジニアリング株式会社 噴霧ノズル及び気体と液体との混合方法
CN106269295A (zh) * 2016-09-05 2017-01-04 洛阳豫鹭矿业有限责任公司 一种浮选柱
FR3089822B1 (fr) * 2018-12-12 2022-01-14 Suez Groupe Dispositif d’injection de fluide dans un liquide
CN114849503B (zh) * 2022-07-07 2022-09-23 北京石油化工学院 一种溶气设备

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144386C2 (de) * 1981-11-07 1983-12-29 J.M. Voith Gmbh, 7920 Heidenheim Injektorflotationsapparat
DE3614933C1 (de) * 1986-05-02 1987-10-22 Voith Gmbh J M Flotationsbehaelter oder -zelle
CA1329277C (en) * 1986-09-25 1994-05-03 Graeme John Jameson Column flotation method and apparatus
DE3634903A1 (de) * 1986-10-14 1988-04-28 Voith Gmbh J M Flotationseinrichtung
DE8701636U1 (de) * 1987-02-04 1987-03-19 J.M. Voith Gmbh, 7920 Heidenheim Injektor
WO1992003218A1 (en) * 1990-08-27 1992-03-05 The University Of Newcastle Research Associates Limited Aeration of liquids

Also Published As

Publication number Publication date
ATE153881T1 (de) 1997-06-15
TW237390B (enrdf_load_stackoverflow) 1995-01-01
KR940021110A (ko) 1994-10-17
DE4309918A1 (en) 1993-08-19
DE4309918C2 (de) 1994-09-15
JP3423404B2 (ja) 2003-07-07
FI941411A0 (fi) 1994-03-25
CA2119936C (en) 1999-04-27
NO941113D0 (no) 1994-03-25
FI941411L (fi) 1994-09-27
NO941113L (no) 1994-09-27
US5465848A (en) 1995-11-14
CA2119936A1 (en) 1994-09-27
FI113748B (fi) 2004-06-15
BR9400883A (pt) 1994-11-01
EP0622122A1 (de) 1994-11-02
JPH07856A (ja) 1995-01-06
NO301968B1 (no) 1998-01-05

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