EP1193342B1 - Column flotation device - Google Patents

Column flotation device Download PDF

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Publication number
EP1193342B1
EP1193342B1 EP00121044A EP00121044A EP1193342B1 EP 1193342 B1 EP1193342 B1 EP 1193342B1 EP 00121044 A EP00121044 A EP 00121044A EP 00121044 A EP00121044 A EP 00121044A EP 1193342 B1 EP1193342 B1 EP 1193342B1
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EP
European Patent Office
Prior art keywords
set forth
flotation
flotation device
baffles
flow
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
EP00121044A
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German (de)
French (fr)
Other versions
EP1193342A1 (en
Inventor
Robert Heinz
Lucas Menke
Bernhard Niemczyk
George Troubounis
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.)
Meri Environmental Solutions GmbH
Original Assignee
Meri Entsorgungstechnik Fuer Die Papierindustrie GmbH
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Filing date
Publication date
Application filed by Meri Entsorgungstechnik Fuer Die Papierindustrie GmbH filed Critical Meri Entsorgungstechnik Fuer Die Papierindustrie GmbH
Priority to AT00121044T priority Critical patent/ATE257529T1/en
Priority to ES00121044T priority patent/ES2214203T3/en
Priority to EP00121044A priority patent/EP1193342B1/en
Publication of EP1193342A1 publication Critical patent/EP1193342A1/en
Application granted granted Critical
Publication of EP1193342B1 publication Critical patent/EP1193342B1/en
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    • 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
    • B03D1/1431—Dissolved air flotation machines
    • 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
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • 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
    • B03D1/1481—Flotation machines with a plurality of parallel plates
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a flotation device for separation of substances or mixtures of substances from suspensions for Formation of at least one substance-rich and low-substance fraction with a columnar separation tank that has a suspension inlet below as well as several obliquely arranged one above the other arranged slats, a first exit for the low-cloth Fraction and a second one arranged in the upper area Output for the high-fraction includes.
  • Such a flotation device is from the publication "Wochenblatt für Textilfabrikation", 1998, Issue 13, page 660 known.
  • Such an arrangement has compared to conventional Flotation arrangements with essentially horizontal Suspension flow the advantage of a much lower Space requirements for the installation, whereas the necessary significantly greater height is usually not critical.
  • a suspension flows along the outer walls a cylindrical container upwards, the Radial clear water between several spaced separating cones enters and exits into a central collecting line can be.
  • a disadvantage of this known arrangement is that the clear water flow an increasing due to the direction of flow Experiences flow velocity, which actually causes the particles that flow upwards and have a tendency to getting carried away. This reduces the efficiency of the Material separation.
  • Another disadvantage is that consecutive Separation processes, be it flotation processes or coupling of flotation and filtration processes requires separate installation of separate assemblies that then be closed in a row.
  • the object of the invention is to create a generic flotation device, which avoids the disadvantages mentioned above and in particular through an effective separation of the desired substances in the suspension in a low-substance and a substance-rich fraction.
  • the arrangement is also said to be compact enable functional series connection of several isolators.
  • the main advantages of the invention are that by arranging the vertical flow radially upwards and the arrangement of the fins radially outside the main flow the flow of the lean fraction is directed radially outwards and is slowing down, which is a better separation of the particles.
  • Another advantage consists in the fact that the low-fraction on the outer circumference, thus collected behind the downstream edges of the slats , which means that additional separation stages are required with a small footprint can be provided, be it as additional flotation or as filtration levels.
  • the separation tank has a circular cross-section.
  • other cross-sectional shapes are also required possible, especially a polygonal, especially triangular or square cross section.
  • the separation tank is usually cylindrical his. If there is a large accumulation due to technical reasons of the substance-rich fraction in the upper area, one can funnel-like or conical design of the main flow channel, that is, a radial reset of those further up Front slat edges should be appropriate.
  • the invention is radial at least one further arrangement outside the collecting duct several second slats provided one above the other arranged in cascade, with the collecting channel between the downstream edges of the former and the upstream edges of the second fins is formed.
  • This arrangement enables an improved separation of the suspension and in particular the derivation of a first sub-fraction after the first flotation step and the derivation of the Residual fraction after the second flotation step.
  • Inlet openings are preferably at the lower end of the collecting duct for the introduction of chemicals and / or Bubble fluid mixtures provided a selective (in particular by means of collective adsorption or hydrophobization) and / or a non-selective flotation principle for use bring to.
  • the lamellae in the form of closed conical rings A special one there is good separation of the fractions if the Slats an angle of inclination to the horizontal of 10 ° -40 °, preferably have 20 ° -30 °. It is also advantageous if the length of the lamellae in the direction of flow of the poor Fraction is 1 to 4 times the width of the through the inner edges of the fins delimited main flow channel. The distance between adjacent slats can be from below increase towards the top to accommodate the different flow and consistency ratios in the lower and upper range separation tank.
  • At least some of the slats can expediently be used be wavy, the waves in the circumferential direction run, so that this does not affect the flow the low-fraction is connected.
  • This training has the advantage of a considerably higher rigidity of the slats.
  • a particularly advantageous development of the invention provides before that at least part of the slats as multilayer, preferably honeycomb structure with two outer layers and in between arranged connection structures is formed, wherein preferably continuous flow channels between the Outer layers are formed. This results in an essential higher strength of the slats.
  • the suspension inlet comprises a feed line with a radial outlet device to generate an outflow in radial direction is connected and this from one to one centric passage, preferably conical dome is covered so that the suspension is centered over the passage enters the separation tank. In this way, one favorable introduction of the suspension into the lower area of the Separation tanks causes.
  • a first embodiment of the invention is shown schematically in axial longitudinal section, thus a flotation device 10a.
  • this essentially comprises an inflow unit 12, a material separation unit 14, a discharge unit 16 for the substance-rich fraction and a first collecting area 18 for the substance-poor fraction.
  • a second collection area 20 for solid particles is also provided.
  • a feed line 22 for the suspension to be separated which in the embodiment shown lead into several separate or one annular outlet 24 which are provided with baffle plates 26 .
  • a feed line 22 or the area of the outlets 24 there is preferably a feed line (not shown) for a liquid containing gas bubbles for a non-selective flotation and / or chemical substances for a selective flotation.
  • the material separation unit 14 is essentially formed by a cylindrical separation tank 28 , in the central area of which a vertical main flow channel 30 is formed, which leads from the inflow unit 12 to the discharge unit 16 .
  • a number of axially spaced lamellae 32 are provided one above the other, which are annularly conical and define between them a radially outward and obliquely downward flow for the low-fraction to the first collecting area 18 .
  • This annular first collecting area 18, which is formed between the wall of the separation tank 28 and the downstream edges of the fins 32 leads to a collecting space 34 arranged above the uppermost fin 32 for a first low-content fraction, in which a first collecting pipe 36 for this first low-content fraction Group is provided.
  • a simple one-stage embodiment of the invention would get along with the assemblies shown so far, the first header tube 36 in such a simple embodiment not necessarily being provided at the top but also elsewhere, for example at the bottom.
  • FIG. 1 The embodiment shown in Figure 1 includes in addition to previously discussed flotation - a filtration stage that will now be described.
  • a filter outer wall 38 is provided radially outside the wall of the separation tank 28 at a certain distance, so that an annular, essentially cylindrical filter space 40 is formed between the two.
  • the filter space is filled with a filter material, preferably sand of a certain consistency or other filter materials such as activated carbon or mixtures thereof.
  • this filter chamber 40 comprises a second collecting pipe 42 for a second low-fraction, which is obtained after a flotation and a subsequent filtration step.
  • a filter material regeneration unit 44 (not shown in more detail) is provided above the filter space 40 , which has the task of cleaning or regenerating filter material and conveying the regenerated filter material into the filter space 40 .
  • the filter material passes through the filter space 40 and arrives in a discharge duct 46, from where it is fed back to the filter material regeneration unit 44 via the schematically indicated line 48 in the used state.
  • the filter material regeneration unit 44 comprises at least one discharge line 47 for a second substance-rich fraction, which is produced by the material separation on the filter material located in the filter space 40 when it is regenerated.
  • the filter space 40 is connected via one or more connection openings 50 to the first collecting area 18 , via which the fraction enters the filter area which has already passed through the flotation area and is not discharged via the first collecting pipe 36 .
  • the discharge unit 16 essentially consists of a widening collecting duct 52 for the substance-rich fraction, which leads to one or more collecting troughs or pipes 54 .
  • one or more conveying devices 56 are provided in order to better convey the material-rich, mostly mud-shaped fraction from the collecting channel 52 into the collecting channel 54 .
  • a collection device 58 for sedimentation of heavy particles is provided below the material separation unit 14, preferably functionally combined with the inflow unit 12 , which opens into a sediment outlet 60 .
  • a suspension flows, which chemical substances and / or gas bubbles can be added to the outlets 24 and is deflected by means of the baffle plates 26 in such a way that when entering the inflow unit 12 there is first a horizontal flow which occurs when entering the main flow channel 30 changes into a radial main flow.
  • This process is supported by the conical shape of the lowest lamella 32 .
  • the type of generation and the location of the introduction of gas bubbles or the number and size of the bubbles determine the type of flotation (pressure relaxation or dispersion flotation).
  • the desired substances from the suspension separate under the action of the supplied gas bubbles and / or chemical substances on the way up into a substance-rich fraction flowing upwards and a substance-poor fraction flowing radially through the lamellae 32 .
  • the substance-rich fraction which is usually sludge-shaped, can be discharged via the collecting troughs 54 after collection in the discharge unit by means of the conveying devices 56 .
  • This substance-rich fraction can either contain undesirable substances such as ash or ink particles, in the recycling of waste paper (is then usually referred to as reject fraction) or else valuable substances, for example in the extraction of ore or minerals.
  • the fraction of poorer material branched off radially from the main flow in the main flow channel 30 reaches the first collecting area 18 after flowing through the annular spaces formed between the lamellae 32. If - unlike in the embodiment shown in FIG. 1 - no further filtration process follows - this is the desired one low-substance fraction, which is removed via the first collecting pipe 36 .
  • this partial fraction flows through the connection openings 50 into the filter space 40 and from there in the vertical direction upwards, in counterflow to the filter material flow, which is from top to bottom runs.
  • a second low-fraction can then be removed via the second collecting pipe 42 , from which the filtered-out substances are removed compared to the fraction that can be discharged via the first collecting pipe 36 , which in turn are removed from the system via the discharge line 47 .
  • the filter material circulates between the filter space 40 and the filter material regeneration unit 44. The heavy particles, for example iron parts, that occur during the separation fall into the sediment collecting device 58 and then into the sediment outlet 60.
  • FIG. 2 shows an alternative embodiment of the invention in the form of a flotation device 10b , which differs from the embodiment according to FIG. 1 in that two flotation stages are arranged one behind the other.
  • the same reference numerals designate the same components. In this regard, to avoid repetition, reference is made to the above description, insofar as this relates to the first flotation step.
  • FIG. 2 differs from that of FIG. 1 in that a second group of fins 62 is arranged radially outside the first collecting area 18 , radially outside of which a third collecting area 64 is provided.
  • first slats 32 and the second slats 62 have the same distances and inclinations, it is not necessary. Rather, the number, shape, inclination, etc. of the second slats 62 can be selected independently of that of the first slats 32 depending on the specific conditions.
  • a feed pipe 66 is provided at the lower end of the first annular collecting area 18 , through which a liquid or chemical substances mixed with gas bubbles are supplied in order to achieve certain flotation conditions in the first collecting area 18 .
  • a third collecting pipe 68 Arranged above the third collecting area 64 is a third collecting pipe 68 for collecting a second low-fraction, which, in contrast to the fraction which can be removed via the first collecting pipe 36, is further freed from substances to be separated.
  • collector pipes 36, 42, 68 any form of collector device is intended to be understood. In particular, it can also involve several pipes or openings that are provided in walls and only open into collecting pipes outside the wall.
  • FIGS. 3a and 3b show two shapes for slats 32, 62 , which are useful instead of simple flat shapes.
  • 3a shows a honeycomb structure with two outer surfaces 70a and 70b , between which connecting struts 72 are provided, the gray areas being intended to represent shadows.
  • the cavities formed between adjacent connecting struts 72 preferably form continuous lines via which part of the flow can also take place.
  • FIG. 3b shows a wave-like configuration of the fins 32, 62 , the direction of flow being indicated by an arrow, that is to say parallel to the wavefront.
  • FIG. 4 An arrangement of three successive flotation stages is shown schematically in FIG. 4, which would look similar to the embodiment of FIG. 2, except that 64 further lamellae would be radially outside the third collecting area.
  • the central axis a not shown in FIGS. 1 and 2, shows that one side is not shown completely here.
  • further slats 74 of a further flotation stage are provided in this embodiment, which preferably have a different distance between adjacent slats.
  • a fourth fourth chamber 76 Radially outside of the lamellae 74 , which is only indicated schematically, is then provided for an even lower-fraction.

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Abstract

The flotation system (10a), to separate a suspension into fractions which are rich and poor has a suspension inflow (22) into the separation tank column (28) which gives a central and vertical main flow (30). Blades (32) are arranged radially outside the main flow. To give a fraction with a low matter content, a flow is directed outwards and at a downwards angle to a collection zone (18), into a ring collection channel (34) for the fraction which has a low material content. The separation tank has a circular or polygonal cross section. Or it has a general funnel shape, with an upwards expanding cross section. A further assembly of blades, stacked over each other, forms a cascade structure radially outside the collection channel. The collection channel is between the downstream edges of the initial blades and the upstream edges of the second set of blades. Inflow openings are at the lower end of the collection channel, for the introduction of chemicals and/or bubble fluid mixtures. A filtration zone (40) is radially outside the collection channel, to hold filtration particles of active carbon. The system has a filtrate outlet and a filter material outlet, where the filtration particles move in a counter flow to the filtrate flow in the filtration zone to the regeneration unit (44) at the opposite end, and are recirculated as regenerated particles. A number of blade flotation units and/or filtration units are assembled in an array outwards and in succession. Separate outlets are between them, to take off different fractions. Two or three blade flotation units are deployed as shells, radially outwards, with two or three filtration units outside a flotation unit. The blades have the shape of a closed conical ring, at a pitch angle of 10-40 degrees to the horizontal, and preferably 20-30 degrees . In the direction of the flow of the low-content fraction, the blades have a length which is 1-4 times the width of the main flow channel defined by the inner edges of the blades. The gap between the blades increases upwards from below. At least part of the blades is corrugated. At least part of the blades is a multilayer honeycomb structure, with two outer layers and linking structures between them, preferably forming passage flow channels between the outer layers. At least part of the blades is a micro-porous membrane, and at least a part of the blades forms a curvature. The suspension inflow has a channel for the incoming suspension into the flotation assembly, with a radial outlet system to give an outflow in a radial direction, covered by a central passage preferably covered by a conical dome, so that the suspension flows centrally into the flotation tank. The radial unit has a horizontal beating plate (26), to deflect the suspension flow radially, The radial unit has a number of radial outflows (24) in a discrete array round the circumference. A take-off unit (16) for the fraction with a high content of matter is over the separation tank, with a passage aligned with the main flow. It has at least one impeller system to pass the rich fraction through a reject outlet, using a rotating conveyor screw or spatial paddles (56) in a horizontal channel (52). The flotation action is non-selective, using a pressure relief flotation with a bubble flow at the suspension inlet. Or the flotation is selective, with a feed of chemical additives at the suspension flow inlet.

Description

Die Erfindung betrifft eine Flotationsvorrichtung zur Trennung von Stoffen oder Stoffgemischen aus Suspensionen zur Bildung mindestens einer stoffreichen und stoffarmen Fraktion mit einem säulenartigen Separationstank, der unten einen Suspensionseinlaß sowie mehrere übereinander angeordnete schräg angeordnete Lamellen, einen ersten Ausgang für die stoffarme Fraktion sowie einen im oberen Bereich angeordneten zweiten Ausgang für die stoffreiche Fraktion umfaßt.The invention relates to a flotation device for separation of substances or mixtures of substances from suspensions for Formation of at least one substance-rich and low-substance fraction with a columnar separation tank that has a suspension inlet below as well as several obliquely arranged one above the other arranged slats, a first exit for the low-cloth Fraction and a second one arranged in the upper area Output for the high-fraction includes.

Eine derartige Flotationsvorrichtung ist aus der Publikation "Wochenblatt für Papierfabrikation", 1998, Heft 13, Seite 660 bekannt. Eine derartige Anordnung besitzt gegenüber herkömmlichen Flotationsanordnungen mit im wesentlichen horizontaler Suspensionsströmung den Vorteil eines wesentlich geringeren Flächenbedarfs für die Aufstellung, wohingegen die dafür erforderliche erheblich größere Höhe meist unkritisch ist. Bei dieser Anordnung strömt eine Suspension entlang der Außenwände eines zylindrischen Behälters nach oben, wobei das Klarwasser zwischen mehreren beabstandeten Trennkonen radial nach innen in eine zentrische Sammelleitung eintritt und abgeführt werden kann. Ein Nachteil dieser vorbekannten Anordnung besteht allerdings darin, daß die Klarwasserströmung aufgrund der Strömungsrichtung nach innen eine zunehmende Strömungsgeschwindigkeit erfährt, wodurch die eigentlich nach oben strömenden, abzutrennenden Partikel eine Tendenz haben, mitgerissen zu werden. Damit sinkt der Wirkungsgrad der Stofftrennung. Ein weiterer Nachteil besteht darin, daß aufeinanderfolgende Trennvorgänge, sei es Flotationsvorgänge oder Kopplungen von Flotations- und Filtrationsvorgängen die separate Installation getrennter Baugruppen erfordert, die dann hintereinander geschlossen werden.Such a flotation device is from the publication "Wochenblatt für Papierfabrikation", 1998, Issue 13, page 660 known. Such an arrangement has compared to conventional Flotation arrangements with essentially horizontal Suspension flow the advantage of a much lower Space requirements for the installation, whereas the necessary significantly greater height is usually not critical. at In this arrangement, a suspension flows along the outer walls a cylindrical container upwards, the Radial clear water between several spaced separating cones enters and exits into a central collecting line can be. A disadvantage of this known arrangement however, is that the clear water flow an increasing due to the direction of flow Experiences flow velocity, which actually causes the particles that flow upwards and have a tendency to getting carried away. This reduces the efficiency of the Material separation. Another disadvantage is that consecutive Separation processes, be it flotation processes or coupling of flotation and filtration processes requires separate installation of separate assemblies that then be closed in a row.

Weitere Säulen-Flotationsvorrichtungen sind aus der US 5467876 und der US 5294003 bekannt. Other column flotation devices are from the US 5467876 and US 5294003 known.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine gattungsgemäße Flotationsvorrichtung zu schaffen, welche die oben genannten Nachteile vermeidet und sich insbesondere durch eine wirksame Trennung der gewünschten Stoffe der Suspension in eine stoffarme und eine stoffreiche Fraktion auszeichnet. Darüber hinaus soll die Anordnung auch die kompakte funktionelle Hintereinanderschaltung mehrerer Trennstufen ermöglichen.Proceeding from this, the object of the invention is to create a generic flotation device, which avoids the disadvantages mentioned above and in particular through an effective separation of the desired substances in the suspension in a low-substance and a substance-rich fraction. In addition, the arrangement is also said to be compact enable functional series connection of several isolators.

Diese Aufgabe wird durch die im Patentanspruch 1 angegebenen Merkmale gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.This object is achieved by the specified in claim 1 Features solved. There are advantageous further developments from the subclaims.

Die wesentlichsten Vorteile der Erfindung bestehen darin, daß durch die Anordnung der Vertikalströmung nach radial oben und die Anordnung der Lamellen radial außerhalb der Hauptströmung die Strömung der stoffarmen Fraktion nach radial außen gerichtet ist und sich damit zunehmend verlangsamt, was eine bessere Abtrennung der Partikel bewirkt. Ein weiterer Vorteil besteht darin, daß die stoffarme Fraktion am Außenumfang, also hinter den stromabwärtigen Kanten der Lamellen gesammelt wird, wodurch mit geringem Platzbedarf weitere Trennstufen vorgesehen werden können, sei es als weitere Flotations- oder als Filtrationsstufen. Durch eine gezielte kaskadenartige Aufeinanderfolge mehrerer Trennstufen, insbesondere von Flotationsstufen unterschiedlicher Prinzipien, ( Druckentspannungs- und physikalische Selektionsverfahren) können mehrere Fraktionen unterschiedlicher Stoffgehalte erzeugt werden. Der damit verbundene zusätzliche Platzbedarf in radialer Richtung ist dabei relativ gering.The main advantages of the invention are that by arranging the vertical flow radially upwards and the arrangement of the fins radially outside the main flow the flow of the lean fraction is directed radially outwards and is slowing down, which is a better separation of the particles. Another advantage consists in the fact that the low-fraction on the outer circumference, thus collected behind the downstream edges of the slats , which means that additional separation stages are required with a small footprint can be provided, be it as additional flotation or as filtration levels. Through a targeted cascade Sequence of several separation levels, especially flotation levels different principles, (pressure relief and physical selection procedures) can be several Fractions of different substance contents are generated. The associated additional space requirement in the radial direction is relatively small.

Am zweckmäßigsten hat der Separationstank kreisrunden Querschnitt. Bei Bedarf sind allerdings auch andere Querschnittsformen möglich, insbesondere ein polygonaler, vor allem dreieckiger oder quadratischer Querschnitt.Most conveniently, the separation tank has a circular cross-section. However, other cross-sectional shapes are also required possible, especially a polygonal, especially triangular or square cross section.

Der Separationstank wird normalerweise zylindrisch ausgebildet sein. Falls sich technisch bedingt eine große Ansammlung der stoffreichen Fraktion im oberen Bereich ergibt, kann eine trichterartige oder konische Ausbildung des Hauptströmungskanals, also eine radiale Zurücksetzung der weiter oben liegenden Lamellenvorderkanten zweckmäßig sein.The separation tank is usually cylindrical his. If there is a large accumulation due to technical reasons of the substance-rich fraction in the upper area, one can funnel-like or conical design of the main flow channel, that is, a radial reset of those further up Front slat edges should be appropriate.

Gemäß einer vorteilhaften Weiterbildung der Erfindung ist radial außerhalb des Sammelkanals mindestens eine weitere Anordnung mehrerer übereinander vorgesehener zweiter Lamellen kaskadenartig angeordnet, wobei der Sammelkanal zwischen den stromabwärtigen Kanten der erstgenannten Lamellen und den stromaufwärtigen Kanten der zweiten Lamellen gebildet ist. Diese Anordnung ermöglicht eine verbesserte Trennung der Suspension und insbesondere die Ableitung einer ersten Teilfraktion nach dem ersten Flotationsschritt und die Ableitung der Restfraktion nach dem zweiten Flotationsschritt.According to an advantageous development of the invention is radial at least one further arrangement outside the collecting duct several second slats provided one above the other arranged in cascade, with the collecting channel between the downstream edges of the former and the upstream edges of the second fins is formed. This arrangement enables an improved separation of the suspension and in particular the derivation of a first sub-fraction after the first flotation step and the derivation of the Residual fraction after the second flotation step.

Dabei sind vorzugsweise am unteren Ende des Sammelkanals Einströmöffnungen für die Einleitung von Chemikalien und/oder Blasenfluidgemischen vorgesehen, um ein selektives (insbesondere mittels Sammeladsorption oder Hydrophobierung) und/oder ein nicht-selektives Flotationsprinzip zur Anwendung zu bringen.Inlet openings are preferably at the lower end of the collecting duct for the introduction of chemicals and / or Bubble fluid mixtures provided a selective (in particular by means of collective adsorption or hydrophobization) and / or a non-selective flotation principle for use bring to.

Alternativ oder zusätzlich ist gemäß einer weiteren vorteilhaften Ausbildung der Erfindung außerhalb des Sammelkanals ein von diesem beschickter, mit Filtrationspartikeln gefüllter Filtrationsraum vorgesehen. Hierdurch ist eine Stoffabtrennung auf dem Filtrationsprinzip möglich, was nur einen sehr geringen zusätzlichen radialen Platzbedarf hat. Dabei läßt sich eine besonders wirksame Filtrierung erreichen, wenn ein Filtratauslaß und ein Filtermatieralauslaß vorgesehen sind, wobei die Filtrationspartikel im Gegenstrom zu dem Filtratstrom den Filtrationsraum durchwandern und dabei zur Regeneration entfernbar und am entgegengesetzten Ende in regenerierten Zustand erneut zugeführt werden.Alternatively or additionally, another is advantageous Formation of the invention outside the collecting channel one of them loaded with filtration particles Filtration room provided. This is a separation of substances on the filtration principle possible what only one has very little additional radial space. there a particularly effective filtration can be achieved if a filtrate outlet and a filter material outlet are provided are, the filtration particles in countercurrent to the filtrate stream wander through the filtration room and thereby for regeneration removable and at the opposite end in regenerated Condition again.

Bei allen oben beschriebenen Ausführungen können vorteilhafterweise zwischen den einzelnen Flotations- und/oder Filtrationsstufen getrennte Auslässe zur Entfernung von unterschiedlichen Fraktionen vorgesehen werden. In all the embodiments described above can advantageously between the individual flotation and / or filtration stages separate outlets to remove different ones Parliamentary groups.

Gemäß noch einer vorteilhaften Ausbildung der Erfindung haben die Lamellen die Form geschlossener konischer Ringe. Eine besonders gute Trennung der Fraktionen ergibt sich, wenn die Lamellen einen Neigungswinkel zur Horizontalen von 10°-40°, vorzugsweise 20°-30° aufweisen. Vorteilhaft ist es ferner, wenn die Länge der Lamellen in Strömungsrichtung der stoffarmen Fraktion 1 bis 4 mal so groß ist wie die Breite des durch die Innenkanten der Lamellen begrenzten Hauptströmungskanals. Dabei kann der Abstand zwischen benachbarten Lamellen von unten nach oben hin zunehmen, um die unterschiedlichen Strömungs- und Konsistenzverhältnisse im unteren bzw. oberen Bereich des Separationstanks zu berücksichtigen.According to another advantageous embodiment of the invention the lamellae in the form of closed conical rings. A special one there is good separation of the fractions if the Slats an angle of inclination to the horizontal of 10 ° -40 °, preferably have 20 ° -30 °. It is also advantageous if the length of the lamellae in the direction of flow of the poor Fraction is 1 to 4 times the width of the through the inner edges of the fins delimited main flow channel. The distance between adjacent slats can be from below increase towards the top to accommodate the different flow and consistency ratios in the lower and upper range separation tank.

Dabei kann zweckmäßigerweise zumindest ein Teil der Lamellen wellig ausgebildet sein, wobei die Wellen in Umfangsrichtung verlaufen, so daß hierdurch keine Beeinträchtigung der Strömung der stoffarmen Fraktion verbunden ist. Diese Ausbildung hat den Vorteil einer erheblich höheren Steifigkeit der Lamellen.At least some of the slats can expediently be used be wavy, the waves in the circumferential direction run, so that this does not affect the flow the low-fraction is connected. This training has the advantage of a considerably higher rigidity of the slats.

Eine besonders vorteilhafte Weiterbildung der Erfindung sieht vor, daß zumindest ein Teil der Lamellen als mehrlagige, vorzugsweise wabenartige Struktur mit zwei Außenlagen und dazwischen angeordneten Verbindungsstrukturen ausgebildet ist, wobei vorzugsweise durchgängige Strömungskanäle zwischen den Außenlagen gebildet sind. Dadurch ergibt sich eine wesentlich höhere Festigkeit der Lamellen.A particularly advantageous development of the invention provides before that at least part of the slats as multilayer, preferably honeycomb structure with two outer layers and in between arranged connection structures is formed, wherein preferably continuous flow channels between the Outer layers are formed. This results in an essential higher strength of the slats.

Noch eine Weiterbildung der Erfindung sieht vor, daß der Suspensionseinlaß eine Zuführleitung umfaßt, die mit einer Radialaustrittseinrichtung zur Erzeugung einer Ausströmung in radialer Richtung verbunden ist und diese von einem mit einem zentrischen Durchlaß versehenen, vorzugsweise kegeligen Dom bedeckt ist, so daß die Suspension über den Durchlaß mittig in den Separationstank eintritt. Auf diese Weise wird eine günstige Einleitung der Suspension in den unteren Bereich des Separationstanks bewirkt. Another development of the invention provides that the suspension inlet comprises a feed line with a radial outlet device to generate an outflow in radial direction is connected and this from one to one centric passage, preferably conical dome is covered so that the suspension is centered over the passage enters the separation tank. In this way, one favorable introduction of the suspension into the lower area of the Separation tanks causes.

Die Erfindung wird nachfolgend anhand der beiliegenden Zeichnungen weiter erläutert. Dabei zeigt:

Fig. 1:
eine schematische Längsschnittansicht durch eine erste Ausführungsform der Erfindung mit einer Flotations- und einer Filtrationstufe;
Fig. 2:
eine schematische Längsschnittansicht durch eine zweite Ausführungsform der Erfindung mit zwei aufeinanderfolgenden Flotationsstufen;
Fig. 3:
schematisch zwei alternative Formen für die Lamellen; und
Fig. 4:
schematisch eine Anordnung mit drei aufeinanderfolgenden Flotationsschritten.
The invention is further explained below with reference to the accompanying drawings. It shows:
Fig. 1:
is a schematic longitudinal sectional view through a first embodiment of the invention with a flotation and a filtration stage;
Fig. 2:
a schematic longitudinal sectional view through a second embodiment of the invention with two successive flotation stages;
Fig. 3:
schematically two alternative forms for the slats; and
Fig. 4:
schematically an arrangement with three successive flotation steps.

In Figur 1 ist schematisch im axialen Längsschnitt eine erste Ausführungsform der Erfindung dargestellt, mithin eine Flotationsvorrichtung 10a. Diese umfaßt baugruppenmäßig im wesentlichen eine Einströmeinheit 12, eine Stofftrenneinheit 14, eine Abführeinheit 16 für die stoffreiche Fraktion und einen erster Sammelbereich 18 für die stoffarme Fraktion. Ferner ist noch ein zweiter Sammelbereich 20 für feste Partikel vorgesehen.In Figure 1, a first embodiment of the invention is shown schematically in axial longitudinal section, thus a flotation device 10a. In terms of subassembly, this essentially comprises an inflow unit 12, a material separation unit 14, a discharge unit 16 for the substance-rich fraction and a first collecting area 18 for the substance-poor fraction. A second collection area 20 for solid particles is also provided.

In der Einströmeinheit 12 führt eine Zuführleitung 22 für die zu trennende Suspension, die in der gezeigten Ausführung in mehrere separate oder einen ringförmigen Auslaß 24 führen, die mit Prallplatten 26 versehen sind. In der Zuführleitung 22 oder dem Bereich der Auslässe 24 ist vorzugsweise eine nicht dargestellte Zuleitung für eine gasblasenversetzte Flüssigkeit für eine nicht-selektive Flotation und/oder chemische Stoffe für eine selektive Flotation vorgesehen.In the inflow unit 12 leads a feed line 22 for the suspension to be separated, which in the embodiment shown lead into several separate or one annular outlet 24 which are provided with baffle plates 26 . In the feed line 22 or the area of the outlets 24 there is preferably a feed line (not shown) for a liquid containing gas bubbles for a non-selective flotation and / or chemical substances for a selective flotation.

Die Stofftrenneinheit 14 wird im wesentlichen durch einen zylindrischen Separationstank 28 gebildet, in dessen Zentralbereich ein vertikaler Hauptströmungskanal 30 ausgebildet ist, der von der Einströmeinheit 12 bis zur Abführeinheit 16 führt. Radial außerhalb des Hauptströmungskanals 30 sind darin übereinander eine Anzahl axial beabstandeter Lamellen 32 vorgesehen, die ringförmig konisch ausgebildet sind und zwischen sich eine radial nach außen und schräg unten verlaufende Strömung für die stoffarme Fraktion zum ersten Sammelbereich 18 hin definieren. Dieser ringförmige erste Sammelbereich 18, der zwischen der Wandung des Separationstanks 28 und den stromabwärtigen Kanten der Lamellen 32 gebildet ist, führt zu einem oberhalb der obersten Lamelle 32 angeordneten Sammelraum 34 für eine erste stoffarme Fraktion, in dem ein erstes Sammelrohr 36 für diese erste stoffarme Fraktion vorgesehen ist.The material separation unit 14 is essentially formed by a cylindrical separation tank 28 , in the central area of which a vertical main flow channel 30 is formed, which leads from the inflow unit 12 to the discharge unit 16 . Radially outside of the main flow channel 30 , a number of axially spaced lamellae 32 are provided one above the other, which are annularly conical and define between them a radially outward and obliquely downward flow for the low-fraction to the first collecting area 18 . This annular first collecting area 18, which is formed between the wall of the separation tank 28 and the downstream edges of the fins 32 , leads to a collecting space 34 arranged above the uppermost fin 32 for a first low-content fraction, in which a first collecting pipe 36 for this first low-content fraction Group is provided.

Eine einfache einstufige Ausführung der Erfindung würde mit den bisher dargestellten Baugruppen auskommen, wobei das erste Sammelrohr 36 bei einer derartigen einfachen Ausführungsform nicht notwendigerweise oben sondern auch an anderer Stelle, z.B. unten vorgesehen sein kann.A simple one-stage embodiment of the invention would get along with the assemblies shown so far, the first header tube 36 in such a simple embodiment not necessarily being provided at the top but also elsewhere, for example at the bottom.

Die in Figur 1 dargestellte Ausführungsform umfaßt neben der bisher diskutierten Flotations- eine Filtrationsstufe, die nunmehr beschrieben wird.The embodiment shown in Figure 1 includes in addition to previously discussed flotation - a filtration stage that will now be described.

Radial außerhalb konzentrisch der Wand des Separationstanks 28 ist in einem gewissen Abstand eine Filteraußenwand 38 vorgesehen, so daß zwischen beiden ein ringförmiger im wesentlichen zylindrischer Filterraum 40 ausgebildet ist. Der Filterraum ist mit einem Filtermaterial gefüllt, vorzugsweise Sand bestimmter Konsistenz oder anderer Filterstoffe wie Aktivkohle oder Mischungen davon.A filter outer wall 38 is provided radially outside the wall of the separation tank 28 at a certain distance, so that an annular, essentially cylindrical filter space 40 is formed between the two. The filter space is filled with a filter material, preferably sand of a certain consistency or other filter materials such as activated carbon or mixtures thereof.

Dieser Filterraum 40 umfaßt in seinem oberen Endbereich ein zweites Sammelrohr 42 für eine zweite stoffarme Fraktion, die nach einem Flotations- und einem darauffolgenden Filtrationsschritt erhalten wird. Oberhalb des Filterraumes 40 ist eine nicht näher dargestellte Filtermaterial-Regenerationseinheit 44 vorgesehen, welche die Aufgabe hat, Filtermaterial zu reinigen bzw. zu regenerieren und das regenerierte Filtermaterial in den Filteraum 40 fördert. Das Filtermaterial durchläuft dabei den Filterraum 40 und gelangt in einen Ableitungskanal 46, von wo dieses im verbrauchten Zustand über die schematisch angedeutete Leitung 48 wieder der Filtermaterial-Regenerationseinheit 44 zugeführt wird. Die Filtermaterial-Regenerationseinheit 44 umfaßt mindestens eine Abführleitung 47 für eine zweite stoffreiche Fraktion, die durch die Stofftrennung an dem im Filterraum 40 befindlichen Filtermaterial bei dessen Regenerierung anfällt.In its upper end region, this filter chamber 40 comprises a second collecting pipe 42 for a second low-fraction, which is obtained after a flotation and a subsequent filtration step. A filter material regeneration unit 44 ( not shown in more detail) is provided above the filter space 40 , which has the task of cleaning or regenerating filter material and conveying the regenerated filter material into the filter space 40 . The filter material passes through the filter space 40 and arrives in a discharge duct 46, from where it is fed back to the filter material regeneration unit 44 via the schematically indicated line 48 in the used state. The filter material regeneration unit 44 comprises at least one discharge line 47 for a second substance-rich fraction, which is produced by the material separation on the filter material located in the filter space 40 when it is regenerated.

Der Filterraum 40 steht über eine oder mehrere Verbindungsöffnungen 50 mit dem ersten Sammelbereich 18 in Verbindung, über welche die Fraktion in den Filterbereich eintritt, die den Flotationsbereich bereits durchlaufen hat und nicht über das erste Sammelrohr 36 abgeleitet wird.The filter space 40 is connected via one or more connection openings 50 to the first collecting area 18 , via which the fraction enters the filter area which has already passed through the flotation area and is not discharged via the first collecting pipe 36 .

Die Abführeinheit 16 besteht im wesentlichen aus einem sich verbreiternden Sammelkanal 52 für die stoffreiche Fraktion, der zu einer oder mehreren Sammelrinnen oder -rohren 54 führt. Um die stoffreiche, meist schlammförmige Fraktion besser aus dem Sammelkanal 52 in die Sammelrinne 54 zu befördern, ist ein oder mehrere Fördereinrichtungen 56, als rotierende Paddelanordnungen dargestellt, vorgesehen.The discharge unit 16 essentially consists of a widening collecting duct 52 for the substance-rich fraction, which leads to one or more collecting troughs or pipes 54 . In order to better convey the material-rich, mostly mud-shaped fraction from the collecting channel 52 into the collecting channel 54 , one or more conveying devices 56, shown as rotating paddle arrangements, are provided.

Unterhalb der Stofftrenneinheit 14, vorzugsweise funktionsvereint mit der Einströmeinheit 12 ist eine Sammeleinrichtung 58 für die Sedimentation schwerer Partikel vorgesehen, die in einen Sedimentauslaß 60 mündet.Below the material separation unit 14, preferably functionally combined with the inflow unit 12 , a collection device 58 for sedimentation of heavy particles is provided, which opens into a sediment outlet 60 .

Nunmehr wird die Arbeitsweise dieser ersten Ausführungsform der Erfindung weiter dargestellt.Now the operation of this first embodiment further illustrated the invention.

Über die Zuführleitung 22 strömt eine Suspension, der chemische Stoffe und/oder Gasbläschen zugesetzt sein können zu den Auslässen 24 und wird mittels der Prallplatten 26 derart umgelenkt, daß beim Eintritt in die Einströmeinheit 12 zunächst eine horizontale Strömung entsteht, die beim Eintritt in den Hauptströmungskanal 30 in eine radiale Hauptströmung übergeht. Dieser Vorgang wird durch die konische Form der untersten Lamelle 32 unterstützt. Die Art der Generierung und der Ort der Einleitung von Gasbläschen bzw. die Bläschenzahl und Größe bestimmen dabei die Art der Flotation ( Druckentspannungs- bzw. Dispersionsflotation).Via the feed line 22 , a suspension flows, which chemical substances and / or gas bubbles can be added to the outlets 24 and is deflected by means of the baffle plates 26 in such a way that when entering the inflow unit 12 there is first a horizontal flow which occurs when entering the main flow channel 30 changes into a radial main flow. This process is supported by the conical shape of the lowest lamella 32 . The type of generation and the location of the introduction of gas bubbles or the number and size of the bubbles determine the type of flotation (pressure relaxation or dispersion flotation).

Die erwünschten Stoffe aus der Suspension trennen sich unter Einwirkung der zugeführten Gasbläschen und/oder chemischen Stoffe auf dem Weg nach oben in eine nach oben weiter strömende stoffreiche Fraktion und eine durch die Lamellen 32 radial strömende stoffarme Fraktion. Die stoffreiche Fraktion, die meist schlammförmig ist, kann nach Sammlung in der Abführeinheit mittels der Fördereinrichtungen 56 über die Sammelrinnen 54 abgeleitet werden. Diese stoffreiche Fraktion kann entweder unerwünschte Stoffe enthalten wie z.B. Asche oder Tintenpartikel, bei der Altpapierstoffaufbereitung (wird dann meist als Rejekt-Fraktion bezeichnet) oder aber Wertstoffe, z.B. bei der Erz- oder Mineraliengewinnung.The desired substances from the suspension separate under the action of the supplied gas bubbles and / or chemical substances on the way up into a substance-rich fraction flowing upwards and a substance-poor fraction flowing radially through the lamellae 32 . The substance-rich fraction, which is usually sludge-shaped, can be discharged via the collecting troughs 54 after collection in the discharge unit by means of the conveying devices 56 . This substance-rich fraction can either contain undesirable substances such as ash or ink particles, in the recycling of waste paper (is then usually referred to as reject fraction) or else valuable substances, for example in the extraction of ore or minerals.

Die von der Hauptströmung im Hauptströmungskanal 30 radial außen abgezweigte stoffärmere Fraktion gelangt nach Durchströmen der zwischen den Lamellen 32 gebildeten Ringräume in den ersten Sammelbereich 18. Sofern sich - anders als bei der in Figur 1 dargestellten Ausführungsform - kein weiterer Filtrationsprozeß anschließt - ist dies die gewünschte stoffarme Fraktion, die über das erste Sammelrohr 36 entfernt wird.The fraction of poorer material branched off radially from the main flow in the main flow channel 30 reaches the first collecting area 18 after flowing through the annular spaces formed between the lamellae 32. If - unlike in the embodiment shown in FIG. 1 - no further filtration process follows - this is the desired one low-substance fraction, which is removed via the first collecting pipe 36 .

Sofern allerdings eine wirksamere Stoffabtrennung zumindest für einen Teil der im ersten Sammelbereich 18 befindlichen Fraktion gewünscht wird, strömt diese Teilfraktion über die Verbindungsöffnungen 50 in den Filterraum 40 und von dort in vertikaler Richtung nach oben, im Gegenstrom zu dem Filtermaterialstrom, der von oben nach unten verläuft. Über das zweite Sammelrohr 42 läßt sich dann eine zweite stoffarme Fraktion entnehmen, von der gegenüber der über das erste Sammelrohr 36 ableitbaren Fraktion die ausgefilterten Stoffe entfernt sind, die wiederum über die Abführleitung 47 aus dem System entfernt werden. Dabei zirkuliert das Filtermaterial zwischen Filterraum 40 und Filtermaterial-Regenerationseinheit 44. Die bei der Trennung anfallenden schweren Partikel, z.B. Eisenteile, fallen in die Sedimant-Sammeleinrichtung 58 und anschließend in den Sedimentauslaß 60. If, however, a more effective material separation is desired at least for a part of the fraction located in the first collecting area 18 , this partial fraction flows through the connection openings 50 into the filter space 40 and from there in the vertical direction upwards, in counterflow to the filter material flow, which is from top to bottom runs. A second low-fraction can then be removed via the second collecting pipe 42 , from which the filtered-out substances are removed compared to the fraction that can be discharged via the first collecting pipe 36 , which in turn are removed from the system via the discharge line 47 . The filter material circulates between the filter space 40 and the filter material regeneration unit 44. The heavy particles, for example iron parts, that occur during the separation fall into the sediment collecting device 58 and then into the sediment outlet 60.

In Figur 2 ist eine alternative Ausführungsform der Erfindung in Form einer Flotationsvorrichtung 10b dargestellt, die sich von der Ausführung gemäß Figur 1 dadurch unterscheidet, daß zwei Flotationsstufen hintereinander angeordnet sind. Gleiche Bezugszeichen bezeichnen dabei gleiche Bauteile. Insoweit wird zur Vermeidung von Wiederholungen auf die oben genannte Beschreibung verwiesen, soweit diese in ersten Flotationsschritt betrifft.FIG. 2 shows an alternative embodiment of the invention in the form of a flotation device 10b , which differs from the embodiment according to FIG. 1 in that two flotation stages are arranged one behind the other. The same reference numerals designate the same components. In this regard, to avoid repetition, reference is made to the above description, insofar as this relates to the first flotation step.

Die Ausführung von Figur 2 unterscheidet sich dadurch von der von Figur 1, daß radial außerhalb des ersten Sammelbereichs 18 eine zweite Gruppe von Lamellen 62 angeordnet ist, radial außerhalb derer ein dritter Sammelbereich 64 vorgesehen ist. Wenngleich in der dargestellten Ausführung die ersten Lamellen 32 und die zweiten Lamellen 62 gleiche Abstände und Neigungen aufweisen, ist nicht notwendig. Vielmehr kann die Anzahl, Form, Neigung etc. der zweiten Lamellen 62 unabhängig von derjenigen der ersten Lamellen 32 abhängig von den spezifischen Bedingungen gewählt werden.The embodiment of FIG. 2 differs from that of FIG. 1 in that a second group of fins 62 is arranged radially outside the first collecting area 18 , radially outside of which a third collecting area 64 is provided. Although in the embodiment shown the first slats 32 and the second slats 62 have the same distances and inclinations, it is not necessary. Rather, the number, shape, inclination, etc. of the second slats 62 can be selected independently of that of the first slats 32 depending on the specific conditions.

Am unteren Ende des ersten ringförmigen Sammelbereichs 18 ist bei dieser Ausführung ein Zuleitungsrohr 66 vorgesehen, über das eine gasblasenversetzte Flüssigkeit oder chemische Stoffe zugeführt werden, um bestimmte Flotationsbedingungen im ersten Sammelbereich 18 zu erreichen.In this embodiment, a feed pipe 66 is provided at the lower end of the first annular collecting area 18 , through which a liquid or chemical substances mixed with gas bubbles are supplied in order to achieve certain flotation conditions in the first collecting area 18 .

Oberhalb des dritten Sammelbereichs 64 ist ein drittes Sammelrohr 68 zum Sammeln einer zweiten stoffarmen Fraktion angeordnet, das im Gegensatz zu der über das erste Sammelrohr 36 entnehmbaren Fraktion weiter von abzutrennenden Stoffen befreit ist. Arranged above the third collecting area 64 is a third collecting pipe 68 for collecting a second low-fraction, which, in contrast to the fraction which can be removed via the first collecting pipe 36, is further freed from substances to be separated.

Sofern in diesem Zusammenhang von Sammelrohren 36, 42, 68 die Rede ist, soll damit jede Form einer Sammeleinrichtung verstanden werden. Es kann sich insbesondere auch um mehrere Rohre handeln oder um Öffnungen, die in Wandungen vorgesehen sind und erst außerhalb der Wandung in Sammelrohre münden.Insofar as collector pipes 36, 42, 68 are referred to in this context, any form of collector device is intended to be understood. In particular, it can also involve several pipes or openings that are provided in walls and only open into collecting pipes outside the wall.

In den Figuren 3a und 3b sind zwei Formen für Lamellen 32, 62 dargestellt, die anstelle einfacher flacher Formen zweckmäßig sind. In Fig. 3a ist eine waabenartige Struktur mit zwei Außenflächen 70a und 70b zu sehen, zwischen denen Verbindungsstreben 72 vorgesehen sind, wobei die grauen Bereiche Schatten darstellen sollen. Vorzugsweise bilden die zwischen benachbarten Verbindungsstreben 72 gebildeten Hohlräume durchgängige Leitungen, über die ebenfalls ein Teil der Strömung stattfinden kann. In Figur 3b ist eine wellenartige Ausbildung der Lamellen 32, 62 dargestellt, wobei die Strömungsrichtung mit einem Pfeil angedeutet ist, also parallel zur Wellenfront verläuft.FIGS. 3a and 3b show two shapes for slats 32, 62 , which are useful instead of simple flat shapes. 3a shows a honeycomb structure with two outer surfaces 70a and 70b , between which connecting struts 72 are provided, the gray areas being intended to represent shadows. The cavities formed between adjacent connecting struts 72 preferably form continuous lines via which part of the flow can also take place. FIG. 3b shows a wave-like configuration of the fins 32, 62 , the direction of flow being indicated by an arrow, that is to say parallel to the wavefront.

In Figur 4 ist schematisch eine Anordnung von drei aufeinanderfolgenden Flotationsstufen dargestellt, die ähnlich der Ausführung von Figur 2 aussehen würde, nur daß radial außerhalb des dritten Sammelbereichs 64 weitere Lamellen wären. Die in den Figuren 1 und 2 nicht dargestellte Mittelachse a zeigt, daß hier eine Seite nicht komplett dargestellt ist. Außerhalb des dritten Sammelbereichs 64 sind bei dieser Ausführungsform weitere Lamellen 74 einer weiteren Flotationsstufe vorgesehen, die vorzugsweise einen anderen Abstand benachbarter Lamellen aufweisen. Radial außerhalb der Lamellen 74 ist dann ein vierter nur noch schematisch angedeuteter vierter Sammelraum 76 für eine noch stoffärmere Fraktion vorgesehen.An arrangement of three successive flotation stages is shown schematically in FIG. 4, which would look similar to the embodiment of FIG. 2, except that 64 further lamellae would be radially outside the third collecting area. The central axis a, not shown in FIGS. 1 and 2, shows that one side is not shown completely here. Outside of the third collecting area 64 , further slats 74 of a further flotation stage are provided in this embodiment, which preferably have a different distance between adjacent slats. Radially outside of the lamellae 74 , a fourth fourth chamber 76, which is only indicated schematically, is then provided for an even lower-fraction.

Claims (32)

  1. A flotation device (10a, 10b) for separating materials or mixtures of materials from suspensions for forming at least one non-float fraction and one float fraction including a column-type separation tank (28) comprising in the lower zone a suspension inlet (12) as well as a stack of inclined baffles (32), a first outlet (36) for the float fraction as well as a second outlet (52) for the non-float fraction arranged in the upper zone, characterized in that said suspension inlet results in a central, vertically oriented main flow, said baffles being arranged radially outside of said main flow and resulting in a flow oriented outwards and inclined downwards for said float fraction, and an annular collection passage (18) for said float fraction being formed radially outside of said baffles.
  2. The flotation device as set forth in claim 1, characterized in that said separation tank comprises a circular or polygonal cross-section.
  3. The flotation device as set forth in claim 1, characterized in that said separation tank is configured funnel-shaped with a cross-section flared upwards.
  4. The flotation device as set forth in any of the preceding claims, characterized in that provided radially outside of said collection passage is at least one further stack of second baffles (62) in a cascaded arrangement, said collection passage being formed between the downstream edges of said first baffles and the upstream edges of said second baffles.
  5. The flotation device as set forth in claim 4, characterized in that inflow ports (66) are provided at the lower end of said collection passage for introducing chemicals and/or gas bubble fluid mixtures.
  6. The flotation device as set forth in any of the preceding claims, characterized in that provided radially outside of said collection passage is a filtration space (40) filled with filtration particles coming from said collection passage.
  7. The flotation device as set forth in claim 6, characterized in that a filtrate outlet (42) and a filter material outlet (46) are provided, said filtration particles migrating in counterflow to said filtrate flow through said filtration space whilst permitting removal for and recycling at the opposite end regenerated.
  8. The flotation device as set forth in in any of the claims 4 to 7, characterized in that a plurality of baffled flotation assemblies as set forth in in claims 1 to 3 and/or filtration arrangements as set forth in claim 6 are arranged each concentric to the other.
  9. The flotation device as set forth in in claim 8, characterized in that separate outlets are provided between said individual flotation and/or filtration stages for removing the different fractions.
  10. The flotation device as set forth in claim 8, characterized in that two or three baffled flotation assemblies are arranged nested concentrically.
  11. The flotation device as set forth in claim 8, characterized in that two or three filtration assemblies are provided radially outside of a baffled flotation assembly.
  12. The flotation device as set forth in any of the preceding claims, characterized in that said baffles take the shape of closed conical rings.
  13. The flotation device as set forth in any of the preceding claims, characterized in that said baffles are inclined at an angle of 10°-40° to the horizontal.
  14. The flotation device as set forth in claim 13, characterized in that said baffles are inclined at an angle of 20°- 30° to the horizontal.
  15. The flotation device as set forth in any of the preceding claims, characterized in that the length of said baffles in the flow direction of said float fraction is 1 to 4 times greater than the width of said main flow passage defined by the inner edges of said baffles.
  16. The flotation device as set forth in any of the preceding claims, characterized in that the spacing between adjacent baffles increases from the bottom up to the top.
  17. The flotation device as set forth in any of the preceding claims, characterized in that at least some of said baffles are configured corrugated.
  18. The flotation device as set forth in any of the preceding claims, characterized in that at least some of said baffles are configured as a laminated structure comprising two skin layers (70a, 70b) sandwiching connecting structures (72).
  19. The flotation device as set forth in claim 18, characterized in that at least some of said baffles are configured as a honeycomb structure.
  20. The flotation device as set forth in claim 18, characterized in that full-length flow passages are formed between said skin layers.
  21. The flotation device as set forth in any of the preceding claims, characterized in that at least some of said baffles are configured as a microporous membrane.
  22. The flotation device as set forth in any of the preceding claims, characterized in that at least some of said baffles are configured curved.
  23. The flotation device as set forth in claim 1, characterized in that said suspension inlet comprises a feed conduit (22) connected to a radial outlet means (24, 26) for generating a radial outlet flow, said radial outlet means being covered by a dome provided with a central through passage so that said suspension enters said separation tank centrally via said through passage.
  24. The flotation device as set forth in claim 23, characterized in that said radial outlet means comprises a horizontal baffle plate to redirect said incident flow radially.
  25. The flotation device as set forth in claim 23, characterized in that said radial outlet means comprises a plurality of discrete radially oriented outlet ports (24) distributed about the circumference.
  26. The flotation device as set forth in claim 1, characterized in that provided above said separation tank is a discharge unit (16) for said non-float fraction comprising a central through passage (52) for said non-float fraction substantially in line with said main flow as well as at least one conveyor means for supplying said non-float fraction to a reject outlet.
  27. The flotation device as set forth in claim 26, characterized in that said conveyor means comprises a rotating worm.
  28. The flotation device as set forth in claim 26, characterized in that said conveyor means comprises at least one passage (54) running substantially horizontal with rotating skimmer paddles (56).
  29. The flotation device as set forth in any of the preceding claims, characterized in that it is designed for non-selective flotation.
  30. The flotation device as set forth in claim 29, characterized in that said flotation is configured as a pressure relief flotation and that in the region of said suspension inlet an inlet is provided for a gas bubble fluid.
  31. The flotation device as set forth in any of the preceding claims, characterized in that it is designed for selective flotation.
  32. The flotation device as set forth in claim 31, characterized in that in the region of said suspension inlet an inlet for chemical additives is provided.
EP00121044A 2000-09-27 2000-09-27 Column flotation device Expired - Lifetime EP1193342B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT00121044T ATE257529T1 (en) 2000-09-27 2000-09-27 COLUMN FLOTATION DEVICE
ES00121044T ES2214203T3 (en) 2000-09-27 2000-09-27 DEVICE FOR FLOATING IN COLUMN.
EP00121044A EP1193342B1 (en) 2000-09-27 2000-09-27 Column flotation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00121044A EP1193342B1 (en) 2000-09-27 2000-09-27 Column flotation device

Publications (2)

Publication Number Publication Date
EP1193342A1 EP1193342A1 (en) 2002-04-03
EP1193342B1 true EP1193342B1 (en) 2004-01-07

Family

ID=8169960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00121044A Expired - Lifetime EP1193342B1 (en) 2000-09-27 2000-09-27 Column flotation device

Country Status (3)

Country Link
EP (1) EP1193342B1 (en)
AT (1) ATE257529T1 (en)
ES (1) ES2214203T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1735070B1 (en) 2004-04-16 2013-08-14 Nijhuis Water Technology B.V. Separator device
WO2008028650A1 (en) * 2006-09-06 2008-03-13 Meri Entsorgungstechnik für die Papierindustrie GmbH Method of softening a liquid or dispersion
DE102007020029A1 (en) 2007-04-27 2008-10-30 Meri Entsorgungstechnik für die Papierindustrie GmbH Flotation device with perforated plate
FI122400B (en) * 2010-05-28 2011-12-30 Metso Paper Inc Flotation cell and method for deinking a fiber suspension
CN105537239A (en) * 2015-12-25 2016-05-04 安徽继宏环保科技有限公司 Vertical spiral air flotation machine of municipal solid waste processing system
WO2017143554A1 (en) * 2016-02-25 2017-08-31 许寅 Scum concentration apparatus
CN112320916B (en) * 2020-09-24 2022-03-18 宁波方太厨具有限公司 Filter element of mineral filter material and water quality mineralization method of filter element

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1107096A (en) * 1964-06-26 1968-03-20 Alexander Peter Saranin Flotation clarifier
US5080780A (en) * 1988-10-11 1992-01-14 Process Development Company Single cell vertical static flow flotation unit cross-reference to related applications
US5294003A (en) * 1990-09-26 1994-03-15 Hollingsworth Clinton A Process for concentration of minerals
GB9106574D0 (en) * 1991-03-27 1991-05-15 Bagghley Jack Improvements in or relating to material treatment apparatus
US5897772A (en) * 1995-12-22 1999-04-27 Chiang; Shiao-Hung Multi-stage flotation column
DE19915735C2 (en) * 1999-04-08 2001-05-23 Meri Entsorgungstech Papierind Column flotation device

Also Published As

Publication number Publication date
EP1193342A1 (en) 2002-04-03
ATE257529T1 (en) 2004-01-15
ES2214203T3 (en) 2004-09-16

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