EP0613725A2 - Dispositif de flottation avec moyens d'aspiration de la mousse - Google Patents

Dispositif de flottation avec moyens d'aspiration de la mousse Download PDF

Info

Publication number
EP0613725A2
EP0613725A2 EP94200443A EP94200443A EP0613725A2 EP 0613725 A2 EP0613725 A2 EP 0613725A2 EP 94200443 A EP94200443 A EP 94200443A EP 94200443 A EP94200443 A EP 94200443A EP 0613725 A2 EP0613725 A2 EP 0613725A2
Authority
EP
European Patent Office
Prior art keywords
tub
flotation device
foam
pipe
suction
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Withdrawn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
EP94200443A
Other languages
German (de)
English (en)
Other versions
EP0613725A3 (fr
Inventor
Antonio Velo
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.)
Velo SpA
Original Assignee
Velo SpA
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 Velo SpA filed Critical Velo SpA
Publication of EP0613725A2 publication Critical patent/EP0613725A2/fr
Publication of EP0613725A3 publication Critical patent/EP0613725A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • B03D1/08—Subsequent treatment of concentrated product
    • B03D1/082—Subsequent treatment of concentrated product of the froth product, e.g. washing
    • 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
    • B03D1/1487—Means for cleaning or maintenance

Definitions

  • the present invention relates to a flotation device for continously separating solid particles suspended in liquids, especially alimentary liquids, in order to proceed with their clarification.
  • the clarification of a liquid may occur by some methods: that is for decantation, filtration, centrifugation and flotation.
  • the flotation is one among the most practical, cheap and well suitable ones for a continuos processing of large liquid masses.
  • Said flotation process consists in separating solid particles from liquid by floating, making transport said particles by gaseous bubbles which are adhered to them.
  • this process is ideal for a continuos processing because it is possible to put continuously into a tub-like vessel a liquid containing solid particles, to which a gas has been added, to have the solid particles transported by the gas and come to the surface and to separate, always in a continuos manner, the floating mass from the liquid mass purified of the particles.
  • floating gases like nitrogen, air or oxygen, and also coadjuvant agents, are added to the liquid mass to be processed, agents that, adhering as bubbles to the increased solid particles, permit them to float in said flotation tub.
  • the skimmer shovels if they are of a very simple kind, have the drawback to require the attention or, at least, a close supervision with operating staff in order to keep the shovels always at a such level which assure a proper drawing of the foam from the flotation tub unless they are provided with complicated means taking into account and follow the level of the floated liquid within the tub.
  • the rotary gatherers have, in addition to a considerable complexity and consequent cost, the risk, if operated very fast, to scatter the foam with considerable problems of hygiene, safety and maintenance.
  • a flotation device which provides to suck the floated foam floating over a liquid mass in clarification within a first tub by means of an exhauster dipped into the foam mass, but not reaching the liquid, moving above said foam mass in order to cover all its surface and, consequently, to remove in a substantially uniform way the foam from the top of the flotation device.
  • the first tub is circular and the exhauster is fixed to a radial arm which is pivotted substantially at the middle of the tub and circularly moves in order to cover all the upper surface of the tub itself.
  • said radial arm is fastened to a rotary support which is positioned at the center of the tub, moved by driving means and installed on a substantially vertical column which is fastened to the bottom of the tub itself.
  • said driving means may be installed either over or under the column.
  • the radial arm outwardly ends with a pipe-fitting movable about the axis of the same arm carrying a suction hood may be oriented in such a way that it turns a suction inlet opening thereof either towards the foam mass, when it is intended to suck the same, or towards an inner wall of the first tub when it is intended to carry out a washing of the tub itself.
  • the above-mentioned movable pipe-fitting is moved by a motor providing to orient the suction hood so that it turns towards the bottom or the side-wall of said first tub depending on whether it is required to suck the foam or to wash the tub of the flotation device.
  • the movable pipe-fitting may be moved with more carefull movements to get the suction hood to reach the dipping depth within the floating foam mass.
  • the suction hood may be manually manoeuvred in order to be fixed to the position requested to carry out the required task, that is the suction of the foam at a controlled depth or the washing of the tub.
  • the tub must be provided with a bottom drain for the removal of the washing water and of every residue trailed thereby.
  • the flotation device 10 consists of a first inner tub 12, substantially cylindrical and formed by a peripherical wall 14 which is suspended above a bottom 16 which is lowered in the middle and provided with an anular opening 18 for the entering of liquid to be clarified, being said opening connected to a pipe 20 for the supply of the liquid itself and surrounded by a relieved crown 22 having the task to upwardly direct the liquid flow to be clarified so that the liquid remains away from the peripheric wall 14.
  • the area delimited by the crown 22 is partially closed upwards by a flange 25 delimiting a ring-shaped opening 27 which allows to keep the flow of the liquid to be clarified away from the center of the inner tub 12 and from its peripheric wall 14.
  • the bottom 16 is joined with a cylindrical peripheric wall 24 defining a second outer tub 26 which forms with the first tub 12 an hollow space 28 in which passes through a space 23 the clarified liquid which has left the solid particles floated by the gas as a foam mass 30 at the tub top 12.
  • the clarified liquid within the hollow space 28 rises and pours, by means of a pipe 32, into a collector reservoir 34 from which it may proceed through a pipe 36 towards the destination of the clarified liquid (conservation, fermentation or packaging).
  • the mass 30 of floated foam consists of a hollow column 40 operating both as a drain-pipe of the foam or as a stand for a rotary support 42 rotated by a motor 44 through a suitable mechanical shafting unit 46 of a kind well known in the art, rotating in the direction of an arrow 48.
  • a pipe-like arm 50 which by means of a pipe-fitting 52, is joined to a suction hood 54 that, from figures 2 and 3 appears consisted of two divergent walls 56a and 56b arranged in a radial direction with respect to the tub 12, of two convergent walls 56a and 56b transversally arranged with respect to the first two walls and of a sleeve 60 for the connection to the pipe-fitting 52.
  • the pipe-fitting 52 is made in such a way to be threaded in the arm 50 and to rotate therein and furthermore, the pipe-fitting has, at one end, a toothed crown 62 engaged in a pinion 64 coming from a motor 66, fastened to the arm 50 and the rotation thereof controls the orientation of the hood 54 with respect to the tub 12.
  • the pipe comprised of the hollow column 40, comes out under the bottom 16 as a pipe 68 for the draining of the foam which, by means of a volumetric pump 70, removing the foam from the flotation device 10 through a further pipe 72.
  • a drain outlet 74 placed under the lowered bottom 16 in the middle thereof, just out of the crown 22, is used, during the washing of the flotation device 10, for drawing and draining the washing water.
  • This drain outled 74 ends with a controlled valve 76 which must be opened when it is required to drain the water with which the washing of the flotation device itself has been carried out.
  • the operation of the device is the following.
  • a liquid to be clarified is put into the tub 12, through the pipe 20, filling completely the tub.
  • the liquid to be clarified containing the thickeners and the flotation gas which is dispersed as a plurality of bubbles, forms an abundant foamy mass 30 at the surface from which it may be gathered and removed by the suction hood 54.
  • the clarified liquid passes through a space 23 and goes into the hollow space 28 which is formed between the wall 14 of the tub 12 and the wall 24 of the second tub 26. From this point the liquid rises up to reach the pipe 32 and pours into the reservoir 34 and from this, by means of the pipe 36, proceeds to the other equipments of the plant.
  • the flotation device 10 As the flotation process ends, it is possible to completely clean the flotation device 10 simply connecting the drain pipe 72 to a water source or reserve and inverting the operation of the volumetric pump 70 so as to supply washing water under pressure to the hood 54 which, under the present occurence, becomes a sprayer.
  • the same hood 54 is oriented by an appropriate control signal to the positioning motor 66 or by means of a manual manoeuvre in order to point towards the wall 14 of the inner tub 12 so that the spray coming out from the hood 54, hits the wall 14 and at last gathers on the lowered bottom 16 moves all the present residues of both liquid and foam, also diluting possible bottom sludges 78 due to collection of not floated particles 80 falling towards the bottom.
  • the opening of the valve 76 of the drain outlet 74 removes the washing water together with all the residues permitting a complete cleaning of the flotation device.
  • the positioner motor 66, the pinion 64 and the toothed crown 62 on the pipe-fitting 52 might be all omitted and the orientation of the hood 54 might be carried out manually because the adjustment of the dipping depth of the hood 54 into the foamy mass 30 is usually done once for all when the flotation process begins and the whashing of the flotation device is carried out only when ends the process usually lasting several hours.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Physical Water Treatments (AREA)
EP94200443A 1993-02-25 1994-02-22 Dispositif de flottation avec moyens d'aspiration de la mousse. Withdrawn EP0613725A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD930017U 1993-02-25
ITPD930017 IT231090Y1 (it) 1993-02-25 1993-02-25 Flottatore, munito di aspiratore, per separare in continuazione particelle solide da liquidi alimentari

Publications (2)

Publication Number Publication Date
EP0613725A2 true EP0613725A2 (fr) 1994-09-07
EP0613725A3 EP0613725A3 (fr) 1995-04-05

Family

ID=11390158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94200443A Withdrawn EP0613725A3 (fr) 1993-02-25 1994-02-22 Dispositif de flottation avec moyens d'aspiration de la mousse.

Country Status (2)

Country Link
EP (1) EP0613725A3 (fr)
IT (1) IT231090Y1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500102A1 (fr) 2011-03-15 2012-09-19 Siemens Aktiengesellschaft Dispositif de flottation avec un élément de distribution d'un fluide pouvant générer un courant du fluide vers le collecteur en mousse
WO2017210752A1 (fr) * 2016-06-10 2017-12-14 OPEC Remediation Technologies Pty Limited Procédé et appareil pour la séparation d'une substance de l'eau souterraine
WO2019111238A1 (fr) * 2017-12-09 2019-06-13 OPEC Remediation Technologies Pty Limited Procédé et appareil de séparation d'une substance de l'eau
US10752521B2 (en) 2016-06-13 2020-08-25 Eminus, Llc System and method for treatment of soil and groundwater contaminated with PFAS
CN111719329A (zh) * 2020-06-29 2020-09-29 晋海利 一种基于微气泡浮选的废纸回收用多段式脱墨装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769207A (en) * 1971-06-14 1973-10-30 E Baer Process of separation of emulsified or dispersed matter from water
EP0441230A1 (fr) * 1990-02-09 1991-08-14 Masakatsu Ozawa Appareil pour la séparation par pressurisation et flotation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769207A (en) * 1971-06-14 1973-10-30 E Baer Process of separation of emulsified or dispersed matter from water
EP0441230A1 (fr) * 1990-02-09 1991-08-14 Masakatsu Ozawa Appareil pour la séparation par pressurisation et flotation

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500102A1 (fr) 2011-03-15 2012-09-19 Siemens Aktiengesellschaft Dispositif de flottation avec un élément de distribution d'un fluide pouvant générer un courant du fluide vers le collecteur en mousse
WO2012123258A1 (fr) 2011-03-15 2012-09-20 Siemens Aktiengesellschaft Dispositif de flottation pourvu d'un élément répartiteur de fluide pour produire un courant dirigé vers l'appareil collecteur d'écume
WO2017210752A1 (fr) * 2016-06-10 2017-12-14 OPEC Remediation Technologies Pty Limited Procédé et appareil pour la séparation d'une substance de l'eau souterraine
EP3468700A4 (fr) * 2016-06-10 2020-08-05 Opec Remediation Technologies Pty Limited Procédé et appareil pour la séparation d'une substance de l'eau souterraine
US11975369B2 (en) 2016-06-10 2024-05-07 OPEC Remediation Technologies Pty Limited Apparatus for separation of a substance from groundwater
US10752521B2 (en) 2016-06-13 2020-08-25 Eminus, Llc System and method for treatment of soil and groundwater contaminated with PFAS
WO2019111238A1 (fr) * 2017-12-09 2019-06-13 OPEC Remediation Technologies Pty Limited Procédé et appareil de séparation d'une substance de l'eau
CN112004607A (zh) * 2017-12-09 2020-11-27 欧佩克修复技术有限公司 用于从水中分离物质的方法和设备
CN112004607B (zh) * 2017-12-09 2023-10-10 欧佩克修复技术有限公司 用于从水中分离物质的方法和设备
CN111719329A (zh) * 2020-06-29 2020-09-29 晋海利 一种基于微气泡浮选的废纸回收用多段式脱墨装置

Also Published As

Publication number Publication date
ITPD930017U1 (it) 1994-08-25
IT231090Y1 (it) 1999-07-12
ITPD930017V0 (it) 1993-02-25
EP0613725A3 (fr) 1995-04-05

Similar Documents

Publication Publication Date Title
US4651762A (en) Agitation parts degreaser
US4154678A (en) Skimmer device
US4956100A (en) Method and apparatus for mixing and surface skimming water treatment basins
EP0048091B1 (fr) Machine pour enlever la sédimentation
US5340485A (en) Apparatus and method for clarifier sludge collection
JP4406521B2 (ja) 一定水域に浮遊する物質を収集する装置
US5802653A (en) Device for automatically cleaning the bottom and walls of a swimming-pool
JP2008272671A (ja) 一体型固液分離システムおよびろ過装置
US4443111A (en) Installation for washing vegetables, fruits or similar products
EP0613725A2 (fr) Dispositif de flottation avec moyens d'aspiration de la mousse
US5219470A (en) Apparatus and method for clarifier sludge collection
US4994182A (en) Apparatus for the thickening by floatation of slurries produced during the treatment of waters
CA2044375A1 (fr) Systeme ecumeur pour bassin circulaire de sedimentation et d'epaississement
US4221669A (en) System for separating and removing oil based matter from liquids such as water
US3947355A (en) Apparatus and process of separating packing house waste
US2604443A (en) Spraying system for sludge separators
US3327867A (en) Scum skimmer for a liquid clarifier
JP2859328B2 (ja) 洗砂分離機
US4144172A (en) Industrial liquid cleansing apparatus
US5158679A (en) Crude oil and water separator
KR20030046937A (ko) 오일 새퍼레이터 부유이물 슬러지 연속 자동 제거장치
US5585006A (en) Clarifier having sludge pick-up tubes
US4049549A (en) Liquid condition and settling tanks
USRE22701E (en) Liquid clarification
SU1139464A1 (ru) Установка дл очистки жидкости от механических примесей при мойке корнеплодов

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): BE DE ES FR GR PT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE DE ES FR GR PT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19950921