EP1084753B1 - Verfahren und Vorrichtung zur Trennung mittels pneumatischer Flotation - Google Patents

Verfahren und Vorrichtung zur Trennung mittels pneumatischer Flotation Download PDF

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Publication number
EP1084753B1
EP1084753B1 EP00307484A EP00307484A EP1084753B1 EP 1084753 B1 EP1084753 B1 EP 1084753B1 EP 00307484 A EP00307484 A EP 00307484A EP 00307484 A EP00307484 A EP 00307484A EP 1084753 B1 EP1084753 B1 EP 1084753B1
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EP
European Patent Office
Prior art keywords
pulp
annular channel
separating device
aerated
froth
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Expired - Lifetime
Application number
EP00307484A
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English (en)
French (fr)
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EP1084753A3 (de
EP1084753A2 (de
Inventor
Rainer Dr. Imhof
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Maelgwyn Mineral Services Ltd
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Maelgwyn Mineral Services Ltd
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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
    • B03D1/1418—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
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • 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 present invention relates to a separation device for use in a pneumatic flotation system, especially but not exclusively, for the separation of slurry.
  • Slurry comprises a fluid with particles suspended therein, which together form a pulp which is rich in valuable minerals. It is desirable to extract the minerals from the pulp, and this is typically done by a flotation technique in which air bubbles, which retain the minerals, are created in the pulp and then separated from it.
  • a previously proposed method of separation uses mechanical agitation.
  • the pulp is contained in a cascade of tanks, and agitated with impellers and stators, which maintains particle suspension in the pulp, and introduces air.
  • the air is then dispersed with blowers or by self-aspiration into the impeller mechanism.
  • An alternative method is that of column flotation, in which pulp is introduced into the top of a vertical cylindrical vessel, and a stream of bubbles is produced at the bottom of the vessel, and flows upwardly through the down-flowing pulp.
  • a more efficient method is that of pneumatic flotation, in which bubbles are dispersed through the pulp by aeration means prior to the introduction of the pulp to a separating device.
  • Such devices include the Jameson Cell and the Bahr Cell.
  • Aerated pulp is introduced into cylindrical or conical tanks, and the flow movement creates some separation of the bubbles in the form of a froth, which then flows to a peripheral launder.
  • the aerated pulp is introduced typically 2 metres below the surface of the pulp already held in the tank, which is likely to have a diameter of at least 3 metres.
  • the aerated pulp may be introduced into a cylindrical tank in a tangential and horizontal orientation, to create a rotary movement of the pulp, with centrifugal accelerations generally less than 1ms -2 .
  • the amount of time which the pulp is retained in the tank is typically between 2.5 and 3.5 minutes. This duration is required so that low flow rates of the pulp occur, which allows smaller air bubbles, which have relatively low buoyancy, sufficient time to make their way to the froth on the surface of the pulp.
  • the separation process is relatively slow, and the quality of the separation can be less than ideal.
  • An aim of the present invention is to address one or more of the foregoing disadvantages.
  • the present invention is directed to a method of separation of, especially for use in a pneumatic flotation separation device, as set out in claim 1. Preferred features of such a method are set out in claims 2 and 3. Furthermore, the invention is directed to a separating device, especially for use in a pneumatic flotation system, as set out in claim 4. Preferred features are set out in sub-claims 5 to 10 inclusive.
  • the present invention is directed to a separating device especially for use in a pneumatic flotation system comprising an annular channel, at least one nozzle for introducing aerated pulp substantially horizontally and tangentially into the annular channel, froth extraction means for the removal of separated froth from the annular channel, and pulp extraction means for the removal of separated pulp from the annular channel, in which the pulp extraction means comprises a pulp overflow weir and a plurality of apertures in the annular channel positioned below the top of the pulp overflow weir, and the froth extraction means comprises a froth overflow weir positioned near the inside upper edge of the annular channel.
  • This construction allows for a small volume of separated pulp to leave the annular channel before the majority of the aerated pulp passes over the overflow weir. In this way it is possible to maintain a near-constant height of pulp within the annular channel, to compensate for any variations in the rate of aerated pulp introduction.
  • the froth extraction means further comprises a pipe fed by the froth overflow weir.
  • the overflowing froth is thus collected and piped away from the separator device.
  • the pulp extraction means are positioned near the base of the annular channel. The means are therefore in the vicinity of the separated pulp.
  • the pulp extraction means further comprises a tailings pipe fed by the pulp overflow weir and the apertures.
  • the separated pulp extracted via the apertures and via the pulp overflow weir is thereby combined after extraction within a single pipe to be discharged from the separating device.
  • the separating device further comprises a manifold which distributes the aerated pulp to the at least one nozzle.
  • the manifold can evenly distribute the aerated pulp between a number of nozzles.
  • the invention is further directed to a method of separation, especially for use in a pneumatic flotation separating device, comprising introducing aerated pulp substantially horizontally and tangentially into an annular channel by means of at least one nozzle, in which the at least one nozzle is configured so that the aerated pulp introduced into the annular channel rotates therein with centrifugal acceleration of between 5 and 20 m.s -2 causing the particles in the aerated pulp to be circulated round the annular channel.
  • These large forces act in conjunction with gravitational forces to rapidly and efficiently separate mineral-carrying air bubbles from the fluid and non-floating particulate matter of the pulp, to create an improved quality of mineralised froth.
  • the at least one nozzle introduces the aerated pulp to the annular channel close below the surface of the pulp in the annular channel.
  • the separated pulp which moves downward under the centrifugal and gravitational forces, is removed from the path of newly introduced aerated pulp.
  • the average time spent by the aerated pulp in the separating device is less than 30 seconds. Less time is hence taken to separate a given volume of Less time is hence taken to separate a given volume of aerated pulp. This is made possible by the high centrifugal forces, which increase the velocities of the bubbles and particulate matter so that they separate from each other more quickly.
  • the inner wall 20 extends in height above the height of the outer wall 20.
  • the top edge of the inner wall 20 forms a froth overflow weir 26.
  • Funnel means 28 extend from the weir 26 towards the central axis of the annular channel 18, passing over the top of the outer wall 20, sloping downwards, and defining a gap 30 between the top of the outer wall 20 and the underside of the funnel means 28.
  • a vertical pipe 32 is positioned below the funnel means 28, and coaxial with the annular channel 18. The upper edge of the pipe 32 contacts the underside of the funnel means 28.
  • a plurality of apertures 34 are provided near the base of the outer wall 20, and spaced apart around its circumference.
  • the top of the outer wall 20 forms a pulp overflow weir 36.
  • a tailings pipe 38 is disposed between the outer wall 20 and the pipe 32 so that it encompasses the pipe 32, and tapers at its lower end to form an outlet 40 spaced apart from the lower end of the pipe 32.
  • the interior of the tailings pipe connects with the interior of the annular channel via the apertures 34 and the gap 30.
  • Figure 2 shows the separating device in use.
  • the arrows indicate the flow of the pulp at various stages of the separation process.
  • Slurry pulp which is to be separated comprises non-floating particles suspended in fluid, and contains valuable minerals.
  • the pulp is aerated in an aeration device (not shown) so that it contains many air bubbles, which carry the minerals.
  • the aerated pulp passes into the manifold 12, as indicated by arrow A.
  • the manifold 12 distributes the aerated pulp between the pipes 14 so that the pulp flows along the pipes 14 at velocity.
  • the aerated pulp is introduced horizontally and tangentially into the annular channel 18.
  • the direction and velocity of introduction cause the aerated pulp to circulate around the annular channel as indicated by arrow B.
  • the circulation velocity is determined by the size, number and configuration of the nozzles 16, and the velocity at which the aerated pulp leaves the nozzles 16.
  • the nozzles 16 are situated just below the surface of the circulating pulp.
  • the aerated pulp has two forces acting upon it. These are the gravitational force acting downwards and a centrifugal force acting radially outwards, perpendicular to the axis of rotation.
  • the centrifugal acceleration is between 5 and 20 ms -2 causing the particles in the aerated pulp to be circulated around the annular channel.
  • the resultant force arising from the gravitational and centrifugal forces acts downwardly and outwardly.
  • the direction of the forces is shown schematically in Figure 3, where arrow C shows the centrifugal force, arrow G shows the gravitational force, and arrow F shows the resultant force.
  • the resultant force acts to separate the aerated pulp.
  • the bubbles 42 which carry the minerals contained in the slurry, rise upwards against the direction of the resultant force, as indicated by arrow D. They rise to the surface 43 of the circulating pulp, in the vicinity of the froth overflow weir 26.
  • the bubbles 42 combine to form a mineral-containing froth 46, which under gravity flows over the froth overflow weir 26, down the funnel means 28 and into the pipe 32, as indicated by arrow H.
  • the froth leaves the pipe as indicated by arrow J.
  • the resultant force acts on the non-floating particles 44 to carry them in the opposite direction to the movement of the bubbles 42, so that they settle in the lower part of the annular channel 18, forming a separated pulp.
  • Continuing separation creates a build-up of separated pulp, which flows through the opening 24 into the passage 23.
  • a small portion of the separated pulp comprising predominantly coarse particles, passes through the apertures 34 (arrow K).
  • the remainder of the separated pulp is forced up the passage 23 by the weight of the newly formed separated pulp behind it, and flows over the pulp overflow weir 36 (arrow L).
  • the two thus-formed flows of separated pulp recombine in the tailings pipe 38 to form tailings, which are discharged through the outlet 40 (arrow M).
  • the size of the apertures 34 is determined so that only a small amount of the separated pulp passes through, with the remainder being forced over the pulp overflow weir 36.
  • This arrangement acts to regulate the rate at which the separated pulp leaves the annular channel 18, so that a roughly constant depth of pulp is maintained within the annular channel 18. This compensates for any variations in the flow rate from the nozzles 16 of the incoming aerated pulp.
  • the position of the nozzles 16 means that the aerated pulp is introduced into the annular channel 18 just below the level of the circulating pulp. This means that the incoming flow does not disturb the previously separated pulp, which has settled to the bottom of the annular channel 18.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Fish Paste Products (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (10)

  1. Trennverfahren, insbesondere zur Verwendung in einer pneumatischen Flotations-Trennvorrichtung, umfassend das im Wesentlichen horizontale und tangentiale Einführen von mit Luft versetzter Trübe bzw. einem solchen Brei oder einer solchen Pulpe in einen ringförmigen Kanal (18) mit Hilfe mindestens einer Düse (16), dadurch gekennzeichnet, dass die mindestens eine Düse (16) so ausgestaltet ist, dass die in den ringförmigen Kanal (18) eingebrachte, mit Luft versetzte Trübe oder Pulpe bzw. dieser Brei sich darin mit einer Zentrifugalbeschleunigung von zwischen 5 und 20 ms-2 dreht.
  2. Trennverfahren, insbesondere zur Verwendung in einer pneumatischen Flotations-Trennvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die mindestens eine Düse (16) die mit Luft versetzte Trübe oder Pulpe bzw. diesen Brei dem ringförmigen Kanal (18) dicht unter der Oberfläche der Trübe oder Pulpe bzw. des Breis dem ringförmigen Kanal (18) zuführt.
  3. Trennverfahren, insbesondere zur Verwendung in einer pneumatischen Flotations-Trennvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die durchschnittliche Zeit, die die mit Luft versetzte Trübe oder Pulpe bzw. dieser Brei in der Trennvorrichtung (10) verbringt, weniger als 30 Sekunden beträgt.
  4. Trennvorrichtung (10), insbesondere zur Verwendung in einem pneumatischen Flotationssystem, umfassend einen ringförmigen Kanal (18), mindestens eine Düse (16) für das im Wesentlichen horizontale und tangentiale Einführen von mit Luft versetzter Trübe, Pulpe bzw. einem solchen Brei in den ringförmigen Kanal (18), ein Schaumextraktionsmittel (26) für die Entfernung von abgesondertem Schaum aus dem ringförmigen Kanal (18), und (ein) Extraktionsmittel (24) für die Entfernung von abgesonderter Trübe oder Pulpe bzw. abgesondertem Brei aus dem ringförmigen Kanal (18), dadurch gekennzeichnet, dass das Trübe-/Pulpe-/Brei-Extraktionsmittel (24) eine Überlaufsperre (36) für die Trübe, Pulpe oder den Brei und eine Mehrzahl von Öffnungen (34) in dem ringförmigen Kanal (18) aufweist, die sich unterhalb des oberen Endes der Überlaufsperre (36) für die Trübe, Pulpe oder den Brei befinden, und dass das Schaumextraktionsmittel (26) eine Überlaufsperre (26) für Schaum umfasst, die sich nahe dem inneren oberen Rand des ringförmigen Kanals (18) befindet.
  5. Trennvorrichtung (10) gemäß Anspruch 4, dadurch gekennzeichnet, dass der ringförmige Kanal (18) ein Verhältnis von Durchmesser zu Höhe von größer als 3 besitzt.
  6. Trennvorrichtung (10) gemäß Anspruch 4 oder Anspruch 5, dadurch gekennzeichnet, dass das Schaumextraktionsmittel (26) weiterhin ein Rohr (32) umfasst, das durch die Überlaufsperre (26) für Schaum beschickt wird.
  7. Trennvorrichtung (10) gemäß einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die Extraktionsmittel (24) für Trübe, Pulpe bzw. Brei nahe dem Boden des ringförmigen Kanals (18) angeordnet sind.
  8. Trennvorrichtung (10) gemäß einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass das Extraktionsmittel (24) für Trübe, Pulpe bzw. Brei weiterhin ein Überlauf- oder Abgangsrohr (38) aufweist, das durch die Überlaufsperre (36) für Trübe, Pulpe bzw. Brei und die Öffnungen (34) beschickt wird.
  9. Trennvorrichtung (10) gemäß einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, dass sie weiterhin einen Verteiler (12) umfasst, der die mit Luft versetzte Trübe, Pulpe bzw. den entsprechenden Brei an die mindestens eine Düse (16) verteilt.
  10. Trennvorrichtung (10) gemäß Anspruch 9, dadurch gekennzeichnet, dass sie weiterhin eine Belüftungseinrichtung umfasst, die die mit Luft versetzte Trübe oder Pulpe bzw. den entsprechenden Brei dem Verteiler (12) zuführt.
EP00307484A 1999-09-14 2000-08-31 Verfahren und Vorrichtung zur Trennung mittels pneumatischer Flotation Expired - Lifetime EP1084753B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9921716.8A GB9921716D0 (en) 1999-09-14 1999-09-14 Pneumatic flotation separation device
GB9921716 1999-09-14

Publications (3)

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EP1084753A2 EP1084753A2 (de) 2001-03-21
EP1084753A3 EP1084753A3 (de) 2002-01-09
EP1084753B1 true EP1084753B1 (de) 2006-10-18

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EP00307484A Expired - Lifetime EP1084753B1 (de) 1999-09-14 2000-08-31 Verfahren und Vorrichtung zur Trennung mittels pneumatischer Flotation

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EP (1) EP1084753B1 (de)
AT (1) ATE342772T1 (de)
DE (1) DE60031344T2 (de)
ES (1) ES2274766T3 (de)
GB (1) GB9921716D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112723454A (zh) * 2020-12-04 2021-04-30 周美蓉 一种污水处理用高效射流气浮机

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2001240887B2 (en) 2001-03-19 2007-05-24 Maelgwyn Mineral Services Limited Pneumatic flotation separation device
CA2596329C (en) 2005-02-01 2015-07-14 The University Of Newcastle Research Associates Limited Method and apparatus for contacting bubbles and particles in a flotation separation system
CN113976333B (zh) * 2021-10-25 2022-07-22 中南大学 一种含高磁黄铁矿型铜矿的预处理方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR86129E (fr) * 1964-07-08 1965-12-17 Kloeckner Humboldt Deutz Ag Cuve pour la flottation à la mousse de mélanges de matières à grains fins, en particulier de matières minérales
DE2738782C2 (de) * 1977-08-27 1979-07-12 J.M. Voith Gmbh, 7920 Heidenheim Flotationsvorrichtung zum Entfernen von Druckerschwärze
CH665962A5 (de) * 1985-07-19 1988-06-30 Escher Wyss Gmbh Begasungsvorrichtung fuer eine flotationseinrichtung und deren verwendung.
FR2730941B1 (fr) * 1995-02-23 1997-05-16 Gonzalez Pierre Cellule pour le traitement par flottation d'un milieu liquide
DE19728393C2 (de) * 1997-07-03 1999-08-05 Voith Sulzer Stoffaufbereitung Verfahren und Anlage zur Entfernung von Störstoffen aus einer wässrigen Faserstoffsuspension

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112723454A (zh) * 2020-12-04 2021-04-30 周美蓉 一种污水处理用高效射流气浮机
CN112723454B (zh) * 2020-12-04 2022-09-06 成都市蜀科科技有限责任公司 一种污水处理用高效射流气浮机

Also Published As

Publication number Publication date
DE60031344D1 (de) 2006-11-30
EP1084753A3 (de) 2002-01-09
GB9921716D0 (en) 1999-11-17
ATE342772T1 (de) 2006-11-15
DE60031344T2 (de) 2007-05-24
ES2274766T3 (es) 2007-06-01
EP1084753A2 (de) 2001-03-21

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