EP1726366A1 - Dispositif de flottation d'un liquide - Google Patents

Dispositif de flottation d'un liquide Download PDF

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Publication number
EP1726366A1
EP1726366A1 EP06009335A EP06009335A EP1726366A1 EP 1726366 A1 EP1726366 A1 EP 1726366A1 EP 06009335 A EP06009335 A EP 06009335A EP 06009335 A EP06009335 A EP 06009335A EP 1726366 A1 EP1726366 A1 EP 1726366A1
Authority
EP
European Patent Office
Prior art keywords
liquid
tube
nozzle
gap
air
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.)
Withdrawn
Application number
EP06009335A
Other languages
German (de)
English (en)
Inventor
Klaus Peter Dipl.-Ing. Janisch
Alexander Dipl.-Ing. Gscheider
Friedrich Hoppl
Josef Glawogger
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.)
Andritz AG
Original Assignee
Andritz AG
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 Andritz AG filed Critical Andritz AG
Publication of EP1726366A1 publication Critical patent/EP1726366A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/66Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/70Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/14Flotation machines
    • B03D1/24Pneumatic
    • B03D1/242Nozzles for injecting gas into the flotation tank
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/14Flotation machines
    • B03D1/24Pneumatic
    • B03D1/26Air lift machines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof

Definitions

  • the invention relates to a device for flotation of a liquid with a container into which the liquid to be floated is fed through at least one nozzle.
  • One way to deliver the liquid and the gas bubbles into the container is to pressurize the liquid via a nozzle located above the liquid level in the container, thereby simultaneously entraining finely divided air into the liquid.
  • the resulting gas bubbles release and then fulfill the described floating function.
  • the residence time of the liquid in the container depends largely on the effectiveness of the flotation, which in turn depends on the amount and size of the gas bubbles.
  • the invention is therefore based on the object to provide a device of the type mentioned, in which the highest possible proportion of fine gas bubbles is generated in the liquid received in the container.
  • the jet from the nozzle does not enter directly into the liquid or suspension, but first through a pipe arranged after the nozzle, whereupon the liquid jet enters the liquid. Since a gap for supplying gas, in particular air, is arranged between the nozzle and the pipe, the proportion of air entrained or entrained by the liquid jet can be increased, whereby a higher number of finely divided gas bubbles can be formed.
  • the inner diameter of the tube is larger than the outer diameter of the nozzle. In this way, an annular gap can be formed between the nozzle and the tube, through which additional air can be very effectively incorporated into the liquid.
  • the nozzle may extend into the tube.
  • the tube is spaced from the nozzle in the flow direction of the liquid.
  • a problem with feeding the liquid at the surface of the liquid level through a nozzle is that the foam in the immediate area adjacent to the liquid jet on the surface of the liquid is entrained back into the liquid with particulate matter attached thereto, which affects the efficiency of the flotation adversely affects.
  • the tube is immersed in the liquid. As the tube is immersed in the liquid, it provides protection against the foam floating on the surface of the liquid approaching the jet entering the liquid, thereby reliably preventing foam floating on the surface of the liquid from being swept back into the liquid by the liquid jet becomes.
  • a further tube is arranged and that between the first tube and the other tube, a gap for supplying gas, in particular air, is arranged.
  • the inner diameter of the further tube can in turn be larger than the outer diameter of the first tube in a preferred embodiment. Furthermore, it is also possible in the arrangement of a further tube that the first tube extends into the further tube or that the further tube in the flow direction of the liquid is spaced from the first tube.
  • the further tube is immersed in the liquid, with the already described effect that is prevented in this way that at the liquid surface floating foam is entrained again in the liquid.
  • a line for supplying gas, in particular air, is arranged in the nozzle.
  • the nozzle and the first tube and possibly the further tube are aligned at an angle not equal to 90 ° to the liquid surface.
  • a directed flow can be generated in the container, with which the ascending gas bubbles are directed specifically into a region of the container, where they can rise unhindered and in which, for example, the foam can be particularly easily removed.
  • FIG. 1 shows a first embodiment of a nozzle which can be used in the device according to the invention
  • FIG. 2 shows a second embodiment of a nozzle with a line for supplying air
  • FIG. 3 shows a first embodiment of the invention with one above the liquid level
  • FIG. 4 shows the embodiment of the invention according to FIG. 3, but with the tube immersed in the liquid
  • FIG. 5 shows a second embodiment of the invention with two tubes, the tubes being arranged above the liquid level
  • FIG. 6 the embodiment according to FIG Fig. 5, wherein the lowermost tube is immersed in the liquid.
  • a nozzle 1 which is connected to a supply line 2.
  • a liquid, in particular a suspension at the papermaking, fed which emerges in the direction of arrow 4 from the nozzle 1.
  • a second embodiment of a nozzle 1 is shown, which can also be used in the invention.
  • the nozzle is in turn attached to a supply line 2, wherein the suspension is supplied in the direction of the arrow 3 and emerges in the direction of the arrows 4 from the nozzle 1.
  • a conduit 5 is further arranged for supplying air, which exits in the direction of the arrow 6 from the conduit 5.
  • a first embodiment of the invention is shown in which in the flow direction 4 of the suspension after the nozzle 1, a tube 7 is arranged.
  • This tube has an inner diameter which is larger than the outer diameter of the nozzle 1. Furthermore, the tube 7 is seen in the flow direction 4 spaced from the nozzle 1.
  • air is entrained in the direction of the arrows 9 by the suspension emerging from the nozzle 1, the mixture of air and suspension passing through the pipe 7 and entering the liquid whose liquid level is denoted by 10.
  • the liquid jet entrains the air through the gap 8
  • the liquid-air mixture enters the liquid at a high velocity, thereby forming finely divided gas bubbles, which adhere to the deposited solid particles, which then rise, whereupon forming foam can be removed from the liquid surface 10.
  • the embodiment shown in Fig. 4 differs from that shown in Fig. 3 in that the tube 7 is immersed in the liquid. This avoids that foam, which floats in the area around the tube 7 on the liquid surface 10, is torn by the liquid jet back into the liquid.
  • a further tube 11 is provided, which forms a gap 12 in an analogous manner with the first tube 7, through which in the direction of the arrows 13 even more air sucked and can be introduced with the liquid jet into the liquid.
  • Fig. 6 differs from the embodiment of FIG. 5 again in that the further tube 11 is immersed in the liquid again, so that in an analogous manner as in Fig. 4 prevents foam by the liquid jet back into the Liquid is entrained down.
  • the nozzle according to FIG. 2 could also be used.
  • Other forms of nozzles are of course possible.
  • the nozzle 1 as seen in the flow direction is immersed in the first nozzle 7 or that the first tube 7 is immersed in the further tube 11.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Degasification And Air Bubble Elimination (AREA)
EP06009335A 2005-05-25 2006-05-05 Dispositif de flottation d'un liquide Withdrawn EP1726366A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0090305A AT501976B1 (de) 2005-05-25 2005-05-25 Vorrichtung zur flotation einer flüssigkeit

Publications (1)

Publication Number Publication Date
EP1726366A1 true EP1726366A1 (fr) 2006-11-29

Family

ID=36602520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06009335A Withdrawn EP1726366A1 (fr) 2005-05-25 2006-05-05 Dispositif de flottation d'un liquide

Country Status (3)

Country Link
EP (1) EP1726366A1 (fr)
CN (1) CN1872708A (fr)
AT (1) AT501976B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014188232A1 (fr) * 2013-05-23 2014-11-27 Dpsms Tecnologia E Inovação Em Mineração Ltda Système automatique de colonnes de flottation par mousse avec buses d'injection d'aérateurs et procédé

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009040318A1 (de) * 2009-09-05 2011-03-10 Voith Patent Gmbh Verfahren zur Entfernung von Störstoffen aus einer Fasersuspension durch Flotation sowie Flotationsvorrichtung zu seiner Durchführung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB100637A (en) * 1915-06-04 1916-10-12 Metallurg Company Of America Process of and Apparatus for the Separation of Metalliferous Particles by Oil Flotation.
US1598858A (en) * 1923-04-02 1926-09-07 William E Greenawalt Apparatus for treating liquids with gases
DE2129564A1 (de) * 1971-06-15 1972-12-21 Basf Ag Vorrichtung zum Begasen von Fluessigkeiten
GB2107612A (en) * 1981-10-15 1983-05-05 Kloeckner Humboldt Deutz Ag Method of and flotation cell for the flotation of solids
EP0142595A2 (fr) * 1983-08-23 1985-05-29 Technica Entwicklungsgesellschaft mbH & Co. KG Procédé et dispositif de préparation d'eau d'arrosage pendant le processus d'arrosage pour l'enrichissement avec CO2 et H2CO3
US4645603A (en) * 1977-11-09 1987-02-24 Frankl Gerald P Liquid aeration device and method
EP0465043A2 (fr) * 1990-06-18 1992-01-08 Inax Corporation Ejecteur et son usage dans un procédé de traitement aérobie de l'eau
US20030155084A1 (en) * 2000-02-03 2003-08-21 Bernhard Scherzinger Process for aerating dispersions

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3439464A1 (de) * 1984-10-27 1986-05-07 Hosch-Fördertechnik GmbH, 4350 Recklinghausen Vorrichtung zur einbringung eines gases in eine fluessigkeit
SU1504227A1 (ru) * 1987-12-08 1989-08-30 Брестский инженерно-строительный институт Пневмогидравлический аэратор
RU2040979C1 (ru) * 1992-02-10 1995-08-09 Эмерик Панкратьевич Ячушко Пневматическая флотационная машина
RU2187381C1 (ru) * 2001-06-04 2002-08-20 Иркутский государственный технический университет Аэратор

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB100637A (en) * 1915-06-04 1916-10-12 Metallurg Company Of America Process of and Apparatus for the Separation of Metalliferous Particles by Oil Flotation.
US1598858A (en) * 1923-04-02 1926-09-07 William E Greenawalt Apparatus for treating liquids with gases
DE2129564A1 (de) * 1971-06-15 1972-12-21 Basf Ag Vorrichtung zum Begasen von Fluessigkeiten
US4645603A (en) * 1977-11-09 1987-02-24 Frankl Gerald P Liquid aeration device and method
GB2107612A (en) * 1981-10-15 1983-05-05 Kloeckner Humboldt Deutz Ag Method of and flotation cell for the flotation of solids
EP0142595A2 (fr) * 1983-08-23 1985-05-29 Technica Entwicklungsgesellschaft mbH & Co. KG Procédé et dispositif de préparation d'eau d'arrosage pendant le processus d'arrosage pour l'enrichissement avec CO2 et H2CO3
EP0465043A2 (fr) * 1990-06-18 1992-01-08 Inax Corporation Ejecteur et son usage dans un procédé de traitement aérobie de l'eau
US20030155084A1 (en) * 2000-02-03 2003-08-21 Bernhard Scherzinger Process for aerating dispersions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014188232A1 (fr) * 2013-05-23 2014-11-27 Dpsms Tecnologia E Inovação Em Mineração Ltda Système automatique de colonnes de flottation par mousse avec buses d'injection d'aérateurs et procédé

Also Published As

Publication number Publication date
AT501976B1 (de) 2007-03-15
AT501976A1 (de) 2006-12-15
CN1872708A (zh) 2006-12-06

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