EP0001418B2 - Installation et procédé de flottation pour la récupération de fibres et clarification de liquide particulièrement pour les effluents d'une usine à papier - Google Patents

Installation et procédé de flottation pour la récupération de fibres et clarification de liquide particulièrement pour les effluents d'une usine à papier Download PDF

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Publication number
EP0001418B2
EP0001418B2 EP19780100947 EP78100947A EP0001418B2 EP 0001418 B2 EP0001418 B2 EP 0001418B2 EP 19780100947 EP19780100947 EP 19780100947 EP 78100947 A EP78100947 A EP 78100947A EP 0001418 B2 EP0001418 B2 EP 0001418B2
Authority
EP
European Patent Office
Prior art keywords
dam
fibre
flotation plant
fibres
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
Application number
EP19780100947
Other languages
German (de)
English (en)
Other versions
EP0001418A1 (fr
EP0001418B1 (fr
Inventor
Pierino Farinone
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Individual
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Individual
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Filing date
Publication date
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Publication of EP0001418A1 publication Critical patent/EP0001418A1/fr
Application granted granted Critical
Publication of EP0001418B1 publication Critical patent/EP0001418B1/fr
Publication of EP0001418B2 publication Critical patent/EP0001418B2/fr
Expired 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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
    • B03B5/58—Bowl classifiers
    • 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
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1456—Feed mechanisms for the slurry
    • 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
    • B03D1/1493—Flotation machines with means for establishing a specified flow pattern

Definitions

  • the invention relates to flotation plants and to a process for fibre recovery and liquid clarification.
  • the invention relates to flotation plants for fibre recovery comprising a circular vessel containing liquid mixture to be treated, characterized by the fact that it comprises a radially extending dam which is rotatable in the vessel to cause a pressure on the front side of the dam and a depression on the back side of the dam, thus locally raising the liquid level adjacent the dam said rise substantially corresponding to the thickness of the fibre layer, and lifting floating fibres to a collection zone.
  • the rotating dam is followed - with reference to the roation direction of the dam itself - by a radial pipe provided with spouts arranged along its lower wall, by a trough forming a radial channel having an inclined base, and finally by a projection preferably forming a single unit with the dam, the arrangement being such as to cause liquid mixture fed through the spouts to follow a serpentine path in counter-current to the direction of rotation of the dam.
  • the invention relates also to a process for fibre recovering.
  • a known plant of the aforesaid kind is disclosed e.g. in Italian Patent No. 704,314, filed 7th September, 1963, by Milos Krofta: "Process and device for depurating non-clarified water waste particularly from paper and cellulose mills.
  • the arrangement is such that if the effective angle is increased the scoop dips deeply into and also collects the clarified liquid, whereas if the effective angle is reduced fibre collection is poor (the expression "effective angle” means the angle during which the scoop really collects the fibres to be collected). Such scoop, of course, raises the collected fibre which is caused to drop inwardly for disposal.
  • US-Patent n. 3,452,869 discloses a movable dividing wall which slowly rotates in a vessel while fluid is removed and entered from this moving wall so as the positive pressure which would normally be on the forward face of the wall is reduced by the expedient removal of the fluid adjacent the aforesaid forward face. At the same instant, the otherwise negative pressure areas on the trailing side of the barrier is neutralized by the addition of new unclassified materials.
  • US-Patent n. 4,022,696 also discloses a set of walls slowly rotating in the tank, one of which, placed radially with respect to the tank.
  • the collection of the sludge is made by means of a rotating scoop, that is identical to the one provided in a mechanical way with a radial archemedian screw, forming a spiral scoop which cyclically sinks into the fluid and lifts up fibres.
  • An object of the invention is to obviate the above mentioned disadvantages.
  • the present invention provides a plant and a process as defined by the appended claims where a hydraulic removal substitutes the known mechanical removal of fibres.
  • a flotation plant for fibre recovery comprising a circular vessel having an axis, containing liquid mixture to be treated and comprising in said vessel a dividing wall placed radially which is rotated about said axis, characterized in that this dividing wall is formed as an overflow dam, the upper edge of which is connected to a trough, so that the pressure caused on the front side of the dam locally raises the level of the liquid mixture thus lifting above the upper edge the layer (4) of floating fibres which then reach the trough.
  • a plant for recovering fibre from effluents known as black liquors comprises substantially circular effluent vessel 1 having a lip 10.
  • a central circular coaxial space which contains control means for driving the rotating fibre pick-up unit 3, as well as a system for collecting fibers, a system for feeding the effluent to an annular bath and a system for collecting the clarified water.
  • the pick-up unit 3 comprises one or more tubes 30 for collecting the clarified water and a radial effluent feed pipe 31.
  • gear 36 drives a chain 36', which, in turn, drives a gear 36" fastened to the collecting rotor of the fiber pick-up unit (to be described hereafter).
  • Gear 37 drives a chain 37' which, in turn, drives a gear 37" fastened to a shaft 137 extending radially from unit 3.
  • Shaft 137 is connected, with its end opposed to the end connected to gear 37", to a shaft 137' also extending radially in the vessel, by means of reversing gear device 237.
  • the shafts 137' are more than one e.g. three.
  • a radial pit 5 for collecting precipitated sludge, the collection being improved by rotating a doctor 50.
  • Such sludge flows outwardly e.g. through a tube 51.
  • the liquid surface is level and a spiral scoop skims an upper layer collecting and raising the floating fibres.
  • the operation of such known spiral scoops is cyclic i.e. the collection of fibres is perfect only in one point during each revolution of spiral scoop. Elsewhere the collection of fibres is either poor or a quantity of water is collected together with fibres.
  • a rise h is created at the surface of the bath 11 .
  • rise h is as high as the thickness of fibre layer 4 so that said fibres 4 may be collected by gravity at a lower level i.e. in central space 21. Sealing is obtained by providing unit 3 with walls 60 which cooperate with resilient sealing members 61.
  • Provision of rise h is brought about by a dam 7 which extends over the whole height of the bath 11.
  • Vessel 1 is filled in, in such a way so as the surface 6 of the liquid mixture in the vessel is substantially equal to the upper edge 70 of the dam 7.
  • a radial pipe 31 parallel to the upper edge 70.
  • the upper edge of radial pipe 31 is coplanar with edge 70.
  • a trough 71 which too extends radially and is provided with bottom wall sloping down towards the central space 21.
  • One of its outer walls extends upwardly to provide an apron 72.
  • the volume of this fraction is kept constantly equal to the volume of fibers collected at trough 71. Consequently, the inlet and outlet volumes are in balance and the driving energy of the barrier brings about a "wave" a rise h and containing the fibre layer 4 arranged in front of fibre collecting trough 71.
  • a collecting rotor 8 is provided which is driven by chain 36'.
  • collecting rotor is a member of unit 3 in operation it is subjected to a rotation about the vessel axis 100 and about its own axis.
  • Collecting rotor 8 comprises a tube 80 having a plurality of spokes 81, e.g. six.
  • spokes 81 On each spoke 81 is adjustably mounted a blade 82.
  • the arrangement is such that the distance between the blade and rotor axis may be adjusted so as to regulate the effect of each blade in operation.
  • two ways are available:
  • the outlet of clarified liquid take place through outlet holes 30', provided in tubes 30.
  • the liquid flowing therethrough reaches an annular space 2 thereof which is hydraulically sealed off both from the central space 21 and from the bath 11.
  • the inner and outer walls 2 and 21 of the annular space 2 are arranged at the bottom with a sealing coupling 60-61 of the kind shown at Figure 4.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)

Claims (8)

1. Installation de flottation pour la récupération de fibres qui comporte une cuve circulaire (1) avec un axe (100) et contenant un mélange de liquide à traiter en comprenant dans ladite cuve (1) une paroi on cloison radiale qui tourne autour dudit axe (100), caractérisée en ce que la paroi a la forme d'un barrage ou batardeau à débordement dont le bord supérieur (70) est relié a un bac (71) de façon que la pression déterminée sur le côté avant du barrage élève localement le niveau du mélange en soulevant ainsi su dessus du bord supérieur (70) la couche de fibres flottantes (4) qui enfin arrivent au bac (71).
2. Installation de flottation pour la récupération de fibres selon la revendication 1, caractérisée en ce que le barrage ou batardeau (7) tournant est suivi - par rapport à la direction de rotation du barrage lui-même - par un tube radial (31) pourvu d'ouvertures (31'), par un bac (71) qui forme un canal radial ayant un fond incliné et enfin par une saillie (75), de préférence formant un complexe unique avec le barrage (7), la disposition étant telle qu'elle amène le mélange de liquide alimenté à travers les ouvertures (31 à à suivre un parcours en serpentin (76), à contre- courant par rapport à la direction de rotation du barrage ou batardeau.
3. Installation de flottation pour la récupération de fibres selon les revendications 1 et 2, caractérisée par un élément tournant (8) de collecte, qui s'étend radialement et présente des palettes éventuellement réglables, et qui est monté de manière sensiblement varticale au-dessus du barrage ou batardeau (7) et tourne avec ce dernier, ledit élément (8) tournant aussi autour d'un axe horizontal de façon à faire plonger sa palette (82) dans la couche (4) des fibres de manière à transporter les fibres vers la zone de collecte.
4. Installation de flottation pour la récupération de fibres selon la revendication 3, caractérisée en ce que l'élément radial (8) tourne autour dudit axe horizontal dans une direction opposée à celle de la rotation du barrage.
5. Installation de flottation pour la récupération de fibres selon les revendications 1 et 2, caractérisée en ce que les ouvertures (31') du tube radial (31) sont orientées vers le bas de façon à créer un courant vertical dirigé vers le bas, et/ou que les fibrers, après la zone de collecte, suivent un parcours descendant.
6. Installation de flottation pour la récupération de fibres selon les revendications précédentes, comportant au moins quatre zones concentriques essentiellement séparées par parois ou cloisons mobiles, caractérisée en ce que l'étanchéité entre les parois circulaires mobiles (2', 22), qui limitent la chambre annulaire (2) pour la récupération de l'eau clarifiée et le fond de la cuve (1) est assurée au moyen de garnitures annulaires d'étanchéité à sectin en U (60-61) qui serrent sur les deux côtés de chaque paroi circulaire.
7. Procédé pour la récupération de fibres contenues dans un mélange liquide au moyen d'une installation telle que revendiquée dans les revendications précédentes, caractérisé en ce que le barrage ou batardeau (7) tourne pour créer une montée ou dénivellation (h) correspondant sensiblement à l'épaisseur de la couche (4) de fibres.
8. Procédé suivant la revendication 7, caractérisé en ce que les débits d'entrée et de sortie, à l'intérieur et à l'extérieur de la cuve (1), sont réglés pour obtenir une montée (h) correspondant à l'épaisseur de la couche (4) de fibres.
EP19780100947 1977-09-26 1978-09-21 Installation et procédé de flottation pour la récupération de fibres et clarification de liquide particulièrement pour les effluents d'une usine à papier Expired EP0001418B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8363577A IT1117836B (it) 1977-09-26 1977-09-26 Procedimento ed impianto per il recupero delle fibre negli impianti di flottazione circolari con equipaggio mobile a giostra
IT8363577 1977-09-26

Publications (3)

Publication Number Publication Date
EP0001418A1 EP0001418A1 (fr) 1979-04-18
EP0001418B1 EP0001418B1 (fr) 1982-03-17
EP0001418B2 true EP0001418B2 (fr) 1987-09-23

Family

ID=11323467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780100947 Expired EP0001418B2 (fr) 1977-09-26 1978-09-21 Installation et procédé de flottation pour la récupération de fibres et clarification de liquide particulièrement pour les effluents d'une usine à papier

Country Status (3)

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EP (1) EP0001418B2 (fr)
DE (1) DE2861671D1 (fr)
IT (1) IT1117836B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3525788A1 (de) * 1985-06-24 1987-01-02 Escher Wyss Gmbh Verfahren und anordnung zur steuerung der chemikalien-zugabe zum ausflocken von flockierbaren substanzen in suspensionen, insbesondere zur reinigung des rueckwassers von deinking-anlagen
US7258788B2 (en) * 2004-03-12 2007-08-21 Noram Engineering And Constructors Ltd. Circular clarifier apparatus and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE288462C (fr) *
FR651286A (fr) * 1927-12-05 1929-02-16 Laveur, séparateur, flotteur automatique et rotatif pour épuration de minerais ou produits hétérogènes
US2888139A (en) * 1955-04-25 1959-05-26 Dorr Oliver Inc Combination flotation-settling unit
FR2296464A1 (fr) * 1974-12-30 1976-07-30 Saint Gobain Techn Nouvelles Ensemble de flottation, notamment pour l'epuration des eaux residuelles

Also Published As

Publication number Publication date
IT1117836B (it) 1986-02-24
DE2861671D1 (en) 1982-04-15
EP0001418A1 (fr) 1979-04-18
EP0001418B1 (fr) 1982-03-17

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