FR2544225A1 - Installation for removing impurities, comprising a floatation cell - Google Patents

Installation for removing impurities, comprising a floatation cell Download PDF

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Publication number
FR2544225A1
FR2544225A1 FR8306300A FR8306300A FR2544225A1 FR 2544225 A1 FR2544225 A1 FR 2544225A1 FR 8306300 A FR8306300 A FR 8306300A FR 8306300 A FR8306300 A FR 8306300A FR 2544225 A1 FR2544225 A1 FR 2544225A1
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France
Prior art keywords
cell
air
foams
installation
liquid
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Granted
Application number
FR8306300A
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French (fr)
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FR2544225B1 (en
Inventor
Enar Valentin Hellberg
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SUNDS DEFIBRATOR
Valmet AB
Original Assignee
SUNDS DEFIBRATOR
Sunds Defibrator AB
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Priority claimed from BE166085A external-priority patent/BE840662A/en
Application filed by SUNDS DEFIBRATOR, Sunds Defibrator AB filed Critical SUNDS DEFIBRATOR
Publication of FR2544225A1 publication Critical patent/FR2544225A1/en
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Publication of FR2544225B1 publication Critical patent/FR2544225B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • D21B1/325—Defibrating by other means of waste paper de-inking devices
    • D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/02—Foam dispersion or prevention
    • 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
    • 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
    • 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
    • B03D1/1406—Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
    • 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
    • B03D1/1418—Flotation machines using centrifugal forces
    • 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
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Abstract

The invention relates to a process and an installation for removing, by floatation, impurities in the form of solid particles contained in a liquid. The installation comprises at least one floatation cell through which passes a flow of this liquid to be purified (cleaned) and a flow of air, so as to form froth (floating foam particles) caused by the fixing of air bubbles to the impurities. The floatation cell 1, of cylindrical shape, comprises, in its upper part, a means 14 for inletting a flow of air driving the froth (foam particles) out of the cell. This cell is annular and forms a central conduit 12 surrounding a hopper 13 receiving the froth (foam particles). A plurality of cells 1, 2, 3, 4 are stacked vertically.

Description

La présente invention est relative à un appareil d'élimination par flottation d'impuretés se présentant sous forme de particules solides contenues dans un liquide, dans lequel on injecte dans une cellule de flottation, un flux d'air dans un débit de ce liquide à traiter, de façon à former des bulles d'air qui se répartissent dans ce liquide, qui se fixent aux impuretés et qui remontent en surface en sorte d'engendrer une mousse qui est chargée de ces impuretés et que l'on évacue de la surface de ce liquide. The present invention relates to an apparatus for removing impurities by flotation in the form of solid particles contained in a liquid, into which is injected into a flotation cell, an air flow in a flow of this liquid to treat, so as to form air bubbles which are distributed in this liquid, which are fixed to the impurities and which go up on the surface so as to generate a foam which is charged with these impurities and which one evacuates from the surface of this liquid.

On connatt un appareil du genre susdit pour le désencrage de pâte à papier préparée à partir de vieux papiers, dans lequel on introduit de l'air directement dans le fond de la cellule par aspiration au moyen d'un propulseur qui sert en outre au mélange intime et à la répartition de la suspension fibreuse dans cette cellule. We know an apparatus of the above type for deinking paper pulp prepared from old paper, in which air is introduced directly into the bottom of the cell by suction by means of a propellant which is also used for mixing intimate and the distribution of the fibrous suspension in this cell.

L'entrée d'air directement dans la pâte permet sans doute de régler la pression d'air et donc le diamètre des bulles en fonction du volume d'air qui est luimême réglable dans certaines limites. Or, si l'accroissement du volume d'air permet d'augmenter la pression et par conséquent le diamètre des bulles d'air, il est par contre impossible avec ce procédé connu de diminuer le diamètre des bulles tout en augmentant le débit d'air, ce qui dans certains cas peut être nécessaire pour obtenir la séparation de certaines impuretés. The entry of air directly into the paste undoubtedly makes it possible to adjust the air pressure and therefore the diameter of the bubbles as a function of the volume of air which is itself adjustable within certain limits. However, if the increase in the volume of air makes it possible to increase the pressure and consequently the diameter of the air bubbles, it is however impossible with this known process to reduce the diameter of the bubbles while increasing the flow of air, which in some cases may be necessary to obtain the separation of certain impurities.

L'invention a pour objet un appareil pour l'élimination par flottation d'impuretés sous forme de particules solides contenues dans un liquide. The invention relates to an apparatus for the removal by flotation of impurities in the form of solid particles contained in a liquid.

Selon l'invention, l'appareil comprend en amont de la cellule de flottation au moins une chambre de mélange, étroite, capable de laisser passer une couche mince de liquide à épurer et pourvue d'un moyen capable- d'ad- mettre le flux d'air transversalement à la couche de liquide sur un trajet dans la chambre. According to the invention, the device comprises upstream of the flotation cell at least one mixing chamber, narrow, capable of allowing a thin layer of liquid to be purified to pass and provided with a means capable of admitting the air flow transverse to the liquid layer on a path in the chamber.

Selon une caractéristique, la chambre de mélange est délimitée par deux parois parallèles, distantes l'une de l'autre pour laisser passer la couche de liquide à épurer. According to one characteristic, the mixing chamber is delimited by two parallel walls, spaced from each other to allow the layer of liquid to be purified to pass.

Selon une autre caractéristique, la chambre de mélange comprend un moyen de réglage de la distance entre les parois parallèles. According to another characteristic, the mixing chamber comprises means for adjusting the distance between the parallel walls.

D'autres particularités et détails de l'invention apparaîtront au cours de la description d'une installation en référence aux dessins annexés au présent mémoire, qui représentent, à titre d'exemple seulement, une forme de réalisation de l'invention convenant en particulier pour le désencrage de pâte préparée à partir de vieux papiers. Other features and details of the invention will become apparent during the description of an installation with reference to the drawings appended to this specification, which represent, by way of example only, an embodiment of the invention which is particularly suitable for deinking pulp prepared from old paper.

- La figure 1 est une vue schématique en élévation d'une installation étagée,
- La figure 2 est une coupe horizontale selon la ligne Il-Il de la figure 1.FIG. 1 is a schematic elevation view of a stepped installation,
- Figure 2 is a horizontal section along the line Il-Il of Figure 1.

L'installation comporte quatre cellules de flottation 1, 2, 3, 4. Ces cellules sont annulaires et superposées axialement de manière à constituer les quatre étages d'une tour avec plusieurs fonds 5. Bien entendu, cette tour pourrait avoir un nombre d'étages différent de quatre. The installation comprises four flotation cells 1, 2, 3, 4. These cells are annular and superimposed axially so as to constitute the four floors of a tower with several bottoms 5. Of course, this tower could have a number of floors other than four.

La pate à papier défibrée et prétraitée chimiquement se présentant sous la forme d'une suspension fibreuse contenant un agent moussant est envoyée au moyen d'une pompe 6 par un conduit 7 à l'entrée lia de la cellule 1 en passant d'abord dans une chambre de mélange 8. Cette chambre comporte un passage étroit-où la suspension fibreuse circule sous forme d'une couche mince tandis que simultanément on y admet de l'air transversalement au trajet de cette couche de pâte le long d'une partie par un conduit 9 relié à une source de pression d'air non représentée avec interposition d'un robinet 10. The defibrated and chemically pretreated paper pulp in the form of a fibrous suspension containing a foaming agent is sent by means of a pump 6 via a conduit 7 to the inlet 11a of cell 1, first passing through a mixing chamber 8. This chamber has a narrow passage-where the fibrous suspension circulates in the form of a thin layer while simultaneously air is admitted to it transversely to the path of this layer of dough along a part by a duct 9 connected to an air pressure source not shown with the interposition of a tap 10.

La chambre de mélange 8 communique avec la cellule annulaire 1 par un conduit 11 qui débouche tangentiellement dans la paroi cylindrique de la cellule au voisinage de son fond 5 de sorte que la suspension fibreuse est amenée à tourner autour du conduit central 12 de la cellule annulaire. Les bulles créées dans la suspension se fixent sur les impuretés et les remontent à la surface sous forme de mousses. Celles-ci sont entraînées hors de la cellule à travers la sortie 18, pratiquée dans le conduit 12 partiellement par le mouvement giratoire de la suspension et partiellement par un courant d'air créé au-dessus de cellesci. Une plaque verticale disposée au-dessus du niveau de la pâte guide les mousses vers la sortie. La mousse est récoltée dans une trémie 13 qu'entoure le conduit 12 et est recueillie dans un tank 37 de rejets rempli d'eau.Le flux d'air d'évacuation des mousses est introduit dans la partie supérieure de la cellule par un conduit 14 relié à un appareil d'aspiration 15 disposé au-dessus d'une tubulure axiale tronconique 16 de recyclage de l'air d'évacuation des mousses. Cette tubulure est disposée concentriquement dans le conduit central 12 d'évacuation des r.ousses et est commune à toutes les cellules superposées. L'air d'évacuation des mousses est admis dans la cellule par l'ouverture 17 et quitte celle-ci-par la sortie 18 en entraînant les mousses qui se déversent par gravité dans la trémie3 tandis que l'air s'échappe par la tubulure 16.Celle-ci s'étend dans la cellule adjacente 2 en formant un cône rétréci vers le haut et disposé en regard de la tubulure plus large de recyclage de l'air d'évacuation des mousses de cette cellule adjacente et des autres cellules -3, 4. Les parties constitutives de la tubulure 16 forment un cyclone donnant ainsi une vitesse centrifuge à la mousse permettant de la dissocier de l'air qui est aspiré dans cette tubulure sous l'action de l'appareil d'aspiration 15, d'où il est renvoyé vers le conduit 14 pour être réutilisé pour l'évacuation des mousses. The mixing chamber 8 communicates with the annular cell 1 by a conduit 11 which opens tangentially into the cylindrical wall of the cell in the vicinity of its bottom 5 so that the fibrous suspension is caused to rotate around the central conduit 12 of the annular cell . The bubbles created in the suspension are fixed on the impurities and return them to the surface in the form of foams. These are driven out of the cell through the outlet 18, formed in the conduit 12 partially by the gyratory movement of the suspension and partially by an air current created above them. A vertical plate placed above the level of the dough guides the mosses towards the exit. The foam is collected in a hopper 13 which surrounds the conduit 12 and is collected in a waste tank 37 filled with water. The air flow for evacuating the foam is introduced into the upper part of the cell by a conduit 14 connected to a suction device 15 disposed above a frusto-conical axial tube 16 for recycling the foam discharge air. This tubing is arranged concentrically in the central duct 12 for discharging the r.ousses and is common to all the superimposed cells. The air for discharging the foams is admitted into the cell through the opening 17 and leaves the latter via the outlet 18, entraining the foams which flow by gravity into the hopper3 while the air escapes through the tubing 16.This extends into the adjacent cell 2 by forming a cone narrowed upwards and disposed opposite the larger tubing for recycling the air for the evacuation of the foams of this adjacent cell and of the other cells -3, 4. The constituent parts of the tubing 16 form a cyclone thus giving a centrifugal speed to the foam making it possible to dissociate it from the air which is sucked into this tubing under the action of the suction device 15, from where it is returned to the conduit 14 to be reused for the evacuation of the foams.

La pâte partiellement nettoyée dans la cellule 1 quitte celle-ci par un conduit 19 comportant une pompe 20 permettant d'accroître la pr#ession. Le conduit 19 pénètre dans la chambre de mélange de la cellule suivante 4 située au dernier étage de la tour. Le procédé appliqué est identique à celui mis en oeuvre dans la première cellule et ainsi de suite dans les autres cellules. Celles-ci sont alimentées successivement avec de la pâte ou de l'eau contenant les fibres de plus en plus épurées; tandis que les mousses récoltées dans ces autres cellules sont recyclées à leur tour dans la cellule inférieure. The partially cleaned dough in cell 1 leaves it through a conduit 19 comprising a pump 20 making it possible to increase the pressure. The conduit 19 enters the mixing chamber of the next cell 4 located on the top floor of the tower. The process applied is identical to that implemented in the first cell and so on in the other cells. These are successively supplied with pulp or water containing the increasingly purified fibers; while the foam collected in these other cells is recycled in turn in the lower cell.

Bien entendu, les mousses contenant les matières de rejet de la première cellule et des autres cellules peuvent être soit recyclées, soit évacuées à chaque étage pour être traitées dans un dispositif séparé dépendant du type de produit pour lequel la pâte est prévue. Of course, the foams containing the reject materials from the first cell and from the other cells can be either recycled or discharged on each stage to be treated in a separate device depending on the type of product for which the paste is intended.

L'installation comprend encore un couvercle 40 fermant la cellule du dernier étage, un regard de contr- le 41 avec possibilité d'évacuation rapide pour le nettoyage, une valve de vidange 42 de chaque cellule, un clapet 46 dans le conduit d'air du transport de la mousse, un fond 43 dans la tubulure 12 pour la réception des rejets recyclés, un conduit 44 pour l'évacuation de ces rejets dans la cellule 1 et un conduit 45 pour l'évacuation de la pâte acceptée dans la cellule 2 traitant la pâte la plus épurée.  The installation also includes a cover 40 closing the cell of the top floor, a manhole 41 with the possibility of rapid evacuation for cleaning, a drain valve 42 of each cell, a valve 46 in the air duct. transporting the foam, a bottom 43 in the tubing 12 for receiving the recycled rejects, a conduit 44 for the evacuation of these rejections in the cell 1 and a conduit 45 for the evacuation of the dough accepted in the cell 2 treating the most refined dough.

Claims (8)

REVENDICATIONS l. Installation d'élimination par flottation d'impuretés se présentant sous forme de particules solides contenues dans un liquide comprenant au moins une cellule de flottation (1) traversée par un débit du liquide à épurer et par un flux d'air, de façon à former des mousses flottantes provenant de la fixation de bulles d'air aux impuretés, une entrée 11a pour l'admission du liquide à épu- rer dans la cellule, une chambre de mélange (8) à travers laquelle le liquide circule vers ladite entrée et y est chargée d' air pour y former des bulles, caractérisée en ce que la cellule de flottation (1) est pourvue dans sa partie supérieure d'un moyen (14) d'admission d'un flux d'air entraînant les mousses-hors de cette cellule. l. Installation for the elimination by floating of impurities in the form of solid particles contained in a liquid comprising at least one flotation cell (1) traversed by a flow of the liquid to be purified and by a flow of air, so as to form floating foams from the attachment of air bubbles to impurities, an inlet 11a for the admission of the liquid to be purified into the cell, a mixing chamber (8) through which the liquid circulates towards said inlet and there is charged with air to form bubbles there, characterized in that the flotation cell (1) is provided in its upper part with a means (14) for admission of an air flow entraining the foams-out of this cell. 2. Installation selon la revendication 1, ca ractérisée en ce que la cellule de flottation est annulaire, formant un conduit central (12) qui entoure une trémie (13) dans laquelle les mousses sont entraînées et récoltées par le flux au cours de leur évacuation. 2. Installation according to claim 1, ca acterized in that the flotation cell is annular, forming a central conduit (12) which surrounds a hopper (13) in which the foams are entrained and collected by the flow during their evacuation . 3. Installation selon la revendication 2, caractérisée en ce qu'une tubulure axiale (16) de recyclage de l'air d'évacuation est prévue dans le conduit central (12) 3. Installation according to claim 2, characterized in that an axial tube (16) for recycling the exhaust air is provided in the central duct (12) o au-dessus de la trémie (13).  o above the hopper (13). 4. Installation selon la revendication 1, ca ractérisée en ce que la chambre de mélange (8) est reliée à la cellule de flottation (1) qui est cylindrique par un conduit (11) débouchant à sa périphérie latérale au voisinage du fond (5). 4. Installation according to claim 1, ca acterized in that the mixing chamber (8) is connected to the flotation cell (1) which is cylindrical by a conduit (11) opening at its lateral periphery in the vicinity of the bottom (5 ). 5. Installation selon la revendication 4, ca ractérisée en ce que l'extrémité du conduit reliant la chambre de mélange (3) à la cellule (1) débouche tangentiellement dans le passage de la cellule. 5. Installation according to claim 4, ca acterized in that the end of the conduit connecting the mixing chamber (3) to the cell (1) opens tangentially in the passage of the cell. 6. Installation, dans le cas d'une flottation au moyen d'une batterie de cellules selon l'une quelconque des revendications 1 à 5, caractérisée en ce qu'elle comprend plusieurs cellules (1, 2 3, 4) superposées axialement, présentant des conduits (18) d'-évacuation des mousses com muns à plusieurs cellules. 6. Installation, in the case of flotation by means of a cell battery according to any one of claims 1 to 5, characterized in that it comprises several cells (1, 2 3, 4) superposed axially, having conduits (18) for evacuating common foam with several cells. 7. Installation selon la revendication 6 carac térisée en ce qu'elle comprend une tubulure axiale (16) de recyclage de l'air d'évacuation des mousses qui est commune à toutes les cellules (1, 2, 3, 4). 7. Installation according to claim 6 charac terized in that it comprises an axial tube (16) for recycling the foam discharge air which is common to all the cells (1, 2, 3, 4). 8. Installation selon l'une quelconque des revendications 6 et 7, caractérisée en ce que la tubulure (16) de recyclage d'air d'évacuation des mousses de la cellule inférieure s'étend dans la cellule adjacente en formant un cône rétréci vers le haut et disposé en regard de la tubulure plus large de recyclage de l'air d'évacuation des mousses de cette cellule adjacente et des autres cellules.  8. Installation according to any one of claims 6 and 7, characterized in that the tubing (16) for recycling the air for evacuating the foams from the lower cell extends into the adjacent cell by forming a cone narrowed towards the top and arranged opposite the larger tubing for recycling the air for evacuating the foams from this adjacent cell and from the other cells.
FR8306300A 1976-04-12 1983-04-18 IMPURITY REMOVAL INSTALLATION COMPRISING A FLOTATION CELL Expired FR2544225B1 (en)

Applications Claiming Priority (1)

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BE166085A BE840662A (en) 1976-04-12 1976-04-12 METHOD AND INSTALLATION FOR THE REMOVAL BY FLOTATION OF IMPURITIES IN THE FORM OF SOLID PARTICLES, CONTAINED IN A LIQUID

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FR2544225A1 true FR2544225A1 (en) 1984-10-19
FR2544225B1 FR2544225B1 (en) 1988-11-18

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FR7708842A Granted FR2347984A1 (en) 1976-04-12 1977-03-24 METHOD AND INSTALLATION FOR THE REMOVAL BY FLOTATION OF IMPURITIES IN THE FORM OF SOLID PARTICLES, CONTAINED IN A LIQUID
FR8306300A Expired FR2544225B1 (en) 1976-04-12 1983-04-18 IMPURITY REMOVAL INSTALLATION COMPRISING A FLOTATION CELL

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FR7708842A Granted FR2347984A1 (en) 1976-04-12 1977-03-24 METHOD AND INSTALLATION FOR THE REMOVAL BY FLOTATION OF IMPURITIES IN THE FORM OF SOLID PARTICLES, CONTAINED IN A LIQUID

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JP (2) JPS52124273A (en)
AT (1) AT358499B (en)
BR (1) BR7702266A (en)
CA (1) CA1096515A (en)
CH (1) CH614636A5 (en)
DE (2) DE2760246C2 (en)
ES (1) ES458029A1 (en)
FI (1) FI68093C (en)
FR (2) FR2347984A1 (en)
GB (1) GB1570345A (en)
IT (2) IT1073184B (en)
NL (2) NL180076C (en)
SE (2) SE425145B (en)

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US4157952A (en) * 1978-03-24 1979-06-12 Lenox Institute For Research Apparatus for deinking waste paper pulp
DE2836496C2 (en) * 1978-08-21 1982-05-13 E. & M. Lamort S.A., 51300 Vitry-le-François, Marne Process and device for deinking pulp suspensions
DE3111506C2 (en) * 1981-03-24 1986-01-09 Bergwerksverband Gmbh, 4300 Essen Gas injection device for flotation systems
DE3127290C2 (en) * 1981-07-10 1986-10-30 J.M. Voith Gmbh, 7920 Heidenheim Flotation device for processing waste paper
DE3320125A1 (en) * 1983-06-03 1984-12-06 J.M. Voith Gmbh, 7920 Heidenheim METHOD AND DEVICE FOR PROCESSING WASTE PAPER
AU3762285A (en) * 1984-01-30 1985-08-08 Miller, F.G. Flotation separation apparatus and method
US4613430A (en) * 1984-01-30 1986-09-23 Miller Francis G Froth flotation separation method and apparatus
DE3723502A1 (en) * 1987-07-16 1989-01-26 Henkel Kgaa METHOD FOR FLOTATION OF FILLERS FROM WASTE PAPER
DE3918025A1 (en) * 1989-06-02 1990-12-06 Bergwerksverband Gmbh FLOTATION APPARATUS
FR2772399B1 (en) * 1997-12-15 2000-02-11 Lamort E & M PROCESS FOR DEINKING PAPER PULP FROM RECYCLED PAPER
JP4802305B2 (en) * 2009-07-17 2011-10-26 独立行政法人科学技術振興機構 Floating separation apparatus and method, and manufacturing method of product using the same

Citations (6)

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FR668406A (en) * 1928-01-24 1929-10-31 Phosphate Recovery Corp Improvements in the treatment of phosphatic materials
US1805830A (en) * 1929-05-20 1931-05-19 Mason Charles Dorel Foam destroyer
US2874842A (en) * 1955-04-05 1959-02-24 Krofta Milos Process and apparatus for waste liquid purification
US3148948A (en) * 1961-12-26 1964-09-15 Dorr Oliver Inc Cooling and defoaming phosphoric acid slurries
FR2018255A1 (en) * 1968-09-17 1970-05-29 Baer Erhardt Separating suspended particles forom waste - paper mill water
DE2420482A1 (en) * 1974-04-27 1975-11-13 Bergwerksverband Gmbh METHOD AND SYSTEM FOR FLOTATION

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US1952727A (en) * 1929-10-26 1934-03-27 United Verde Copper Company Froth flotation
AU464321B2 (en) * 1970-10-28 1975-08-07 Aktiengesellschaft Des Altenbergs Furberg Bau Und Zinkhuttenbetrieb Process and apparatus forthe flotation of fine-grained mixtures of material, particularly of minerals
DE2161015A1 (en) * 1971-12-09 1973-06-20 Escher Wyss Gmbh FLOATING DEVICE FOR CLEANING A FIBER SUSPENSION BY FLOTATION IN THE PAPER INDUSTRY

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR668406A (en) * 1928-01-24 1929-10-31 Phosphate Recovery Corp Improvements in the treatment of phosphatic materials
US1805830A (en) * 1929-05-20 1931-05-19 Mason Charles Dorel Foam destroyer
US2874842A (en) * 1955-04-05 1959-02-24 Krofta Milos Process and apparatus for waste liquid purification
US3148948A (en) * 1961-12-26 1964-09-15 Dorr Oliver Inc Cooling and defoaming phosphoric acid slurries
FR2018255A1 (en) * 1968-09-17 1970-05-29 Baer Erhardt Separating suspended particles forom waste - paper mill water
DE2420482A1 (en) * 1974-04-27 1975-11-13 Bergwerksverband Gmbh METHOD AND SYSTEM FOR FLOTATION

Also Published As

Publication number Publication date
SE452121B (en) 1987-11-16
BR7702266A (en) 1977-12-06
NL180076C (en) 1987-01-02
JPS52124273A (en) 1977-10-19
NL180076B (en) 1986-08-01
FR2544225B1 (en) 1988-11-18
FI68093C (en) 1985-07-10
DE2712947A1 (en) 1977-10-20
IT1073184B (en) 1985-04-13
JPS5623659B2 (en) 1981-06-01
NL7703627A (en) 1977-10-14
CA1096515A (en) 1981-02-24
FR2347984A1 (en) 1977-11-10
FR2347984B1 (en) 1983-08-26
NL8601174A (en) 1986-09-01
ES458029A1 (en) 1978-03-16
FI770993A (en) 1977-10-13
AT358499B (en) 1980-09-10
IT8348476A0 (en) 1983-06-10
SE8202540L (en) 1982-04-22
FI68093B (en) 1985-03-29
DE2712947C2 (en) 1985-10-10
JPS56161849A (en) 1981-12-12
SE7704203L (en) 1977-10-13
CH614636A5 (en) 1979-12-14
IT1218334B (en) 1990-04-12
SE425145B (en) 1982-09-06
GB1570345A (en) 1980-07-02
ATA247877A (en) 1980-02-15
DE2760246C2 (en) 1985-09-12
JPS6057903B2 (en) 1985-12-17

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