WO1991019572A1 - Flotation cyclone - Google Patents

Flotation cyclone Download PDF

Info

Publication number
WO1991019572A1
WO1991019572A1 PCT/NL1991/000095 NL9100095W WO9119572A1 WO 1991019572 A1 WO1991019572 A1 WO 1991019572A1 NL 9100095 W NL9100095 W NL 9100095W WO 9119572 A1 WO9119572 A1 WO 9119572A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
flotation
liquid
porous wall
flotation cyclone
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.)
Ceased
Application number
PCT/NL1991/000095
Other languages
French (fr)
Inventor
Henricus Martinus Gerardus Clemens Tils
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.)
Heidemij Reststoffendiensten BV
Original Assignee
Heidemij Reststoffendiensten BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heidemij Reststoffendiensten BV filed Critical Heidemij Reststoffendiensten BV
Priority to US07/955,887 priority Critical patent/US5322169A/en
Priority to EP91912170A priority patent/EP0544683B1/en
Priority to DE69108247T priority patent/DE69108247T2/en
Publication of WO1991019572A1 publication Critical patent/WO1991019572A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1418—Flotation machines using centrifugal forces
    • B03D1/1425—Flotation machines using centrifugal forces air-sparged hydrocyclones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/10—Vortex chamber constructions with perforated walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • 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

Definitions

  • the invention relates to a flotation cyclone, more specifi ⁇ cally a flotation cyclone for small particles of less than 30 ⁇ m, as well as entities at the molecular level, such as molecules as such as well as ions.
  • the present invention provides a flotation cyclone, capable of efficient flotation of such particles as well as entities at the molecular level, such as mole ⁇ cules as such as well as ions.
  • the invention relates to a flotation cyclone comprising a cylinder, in its upper section provided with a porous wall, having a tangential inlet for a liquid with the particles to be separated, a weir at the lower end of the porous wall, and a gas chamber surounding said porous wall.
  • the cylinder has an extension beyond the porous wall downwards as a solid wall, provided at its lower end with water as a blocking device, which may be a bottom plate, whether or not adjustable, a cone, a float or similar.
  • the weir is the separation between the flotation section and the water/foam separating section of the apparatus.
  • the water as a blocking device in said second section allows separation of foam from water. If a bottom plate is used, the cylinder will expand at its lower end to a larger width, causing water to act as a blocking device by ap ⁇ muscularte positioning of the bottom plate.
  • Fig. 1 shows a plan view of a flotation cyclone according to the invention
  • Fig. 2 shows a vertical cross-section of the flotation cyclone of Fig. 1.
  • Fig. l is shown a cylinder (1) with an inlet (2) for the material to be treated.
  • cylinder (1) is shown with a tangential inlet (2), a gas inlet (3'), a porous wall (4), a weir (5), an extension with a solid wall (6), an expansion (7) and a bottom plate (8) with a liquid outlet (9) and a vortex- finder (10).
  • a liquid optionally containing a surfactant, as a surf ⁇ actant, if desired, may be added elsewhere, and having suspended therein small particles (of less than 30 ⁇ m) , is introduced through a tangential inlet (2) into a cylinder (1), comprising a porous wall (4) , which is surrounded by a gas- chamber (3) with an inlet (3') around said porous wall (4).
  • a weir (5) At the bottom of the cylinder (1) is a weir (5).
  • the liquid in tangentially injected into the cylinder (1) with the porous wall (4), thus causing rotation.
  • a plurality of tangential inlets may be used.
  • the weir (5) which usually is of an annular shape, a properly controlled rotating liquid film is obtained.
  • the angle of the weir (5) with the wall of the cylinder (1) can be a right angle, but may deviate therefrom.
  • a gas, inert with respect to the liquid, its contents and the apparatus is intro ⁇ pokerd through the porous wall (4) , thus providing a con ⁇ trolled injection of gas into the film.
  • the gas pressure and the pores in the porous wall (4) are selected such that the gas bubbles formed are in the order of
  • gas chamber (3) may be subdivided into segments, especially if the fraction of the
  • this section of the apparatus is the flotation section.
  • the liquid passing the weir (5) flows into an area (11) of an extension (6) of cylinder (1), said extension (6) having a solid wall, provided with an expansion (7), thus allowing separation of the liquid from the foam.
  • This latter section is the liquid/foam separating section.
  • the area (11) is provided with an adjustable bottom plate (8) , thus allowing liquid to act as a blocking device.
  • the liquid, comprising non-flotated particles, is allowed to discharge from the flotation cyclone by way of an open area (12) between the bottom plate (8) and the outmost wall of the expansion (7).
  • the bottom plate (8) should be positioned in such a way that some liquid is present over the outlet openings at all times in order to prevent gas (foam) from discharging at that end. It should be observed, that the shape of the separation area (11) is not relevant, as mentioned above.
  • the foam created in porous cylinder (1) comprising the flotated particles therein, will fill the void area (13) of said cylinder (1).
  • the liquid as a blocking device, caused by the bottom plate (8), causes that the foam is compelled to emerge from the flotation cyclone by way of the vortex- finder (10).
  • the length of said vortexfinder (10) may vary from as little as the thickness of the lid up to the full length of the porous wall or even longer.
  • the void area (13) acts as a foam draining chamber, thus increasing the selectivity of the flotation procedure.
  • the lid of the cylinder (1) is shown in Fig. 2, where the opening of the vortexfinder (10) has beem omitted.
  • a flotation cyclone according to the drawings was fed with a sludge containing leadsulfide (PbS) in an mount cor ⁇ responding with 13000 ppm Pb. After treatment in the flotation cyclone the lead content had been removed for about 80%. In the remaining total of 40% of dry matter the concentration of Pb had been reduced to 4800 ppm Pb.
  • PbS leadsulfide

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Cyclones (AREA)
  • Saccharide Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

A flotation cyclone for flotation of small particles of less than 30 νm, comprising a cylinder (1) with an upper section, having a porous wall (4) and an extension (6) having a solid wall, said upper section being provided with an tangential inlet (2) and being covered with a lid, having a vortex finder (10) as a foam outlet, and being surrounded by a gas chamber (3) having a gas inlet (3'), surrounding said porous wall (4), and being provided at the lower end of said porous wall (4) with a weir (5), while the extension (6) of said cylinder, having a solid wall, is provided at its lower end with a liquid as a blocking device.

Description

Flotation cyclone
The invention relates to a flotation cyclone, more specifi¬ cally a flotation cyclone for small particles of less than 30 μm, as well as entities at the molecular level, such as molecules as such as well as ions.
Though various attempts have been made for separating particles by flotation, none of these have turned out to be satisfactory for efficient flotation of small particles of less than 30 μm. The present invention provides a flotation cyclone, capable of efficient flotation of such particles as well as entities at the molecular level, such as mole¬ cules as such as well as ions.
The invention relates to a flotation cyclone comprising a cylinder, in its upper section provided with a porous wall, having a tangential inlet for a liquid with the particles to be separated, a weir at the lower end of the porous wall, and a gas chamber surounding said porous wall. The cylinder has an extension beyond the porous wall downwards as a solid wall, provided at its lower end with water as a blocking device, which may be a bottom plate, whether or not adjustable, a cone, a float or similar.
The weir is the separation between the flotation section and the water/foam separating section of the apparatus. The water as a blocking device in said second section allows separation of foam from water. If a bottom plate is used, the cylinder will expand at its lower end to a larger width, causing water to act as a blocking device by ap¬ propriate positioning of the bottom plate.
The invention will now be elucidated with reference to the accompanying drawings without limiting the invention thereto. In the drawings:
Fig. 1 shows a plan view of a flotation cyclone according to the invention, and
Fig. 2 shows a vertical cross-section of the flotation cyclone of Fig. 1.
In the drawings identical parts are referred to by iden- tical reference numbers.
In Fig. l is shown a cylinder (1) with an inlet (2) for the material to be treated.
In Fig. 2 the cylinder (1) is shown with a tangential inlet (2), a gas inlet (3'), a porous wall (4), a weir (5), an extension with a solid wall (6), an expansion (7) and a bottom plate (8) with a liquid outlet (9) and a vortex- finder (10).
A liquid, optionally containing a surfactant, as a surf¬ actant, if desired, may be added elsewhere, and having suspended therein small particles (of less than 30 μm) , is introduced through a tangential inlet (2) into a cylinder (1), comprising a porous wall (4) , which is surrounded by a gas- chamber (3) with an inlet (3') around said porous wall (4). At the bottom of the cylinder (1) is a weir (5). The liquid in tangentially injected into the cylinder (1) with the porous wall (4), thus causing rotation. If desired a plurality of tangential inlets may be used. By means of the weir (5), which usually is of an annular shape, a properly controlled rotating liquid film is obtained. The angle of the weir (5) with the wall of the cylinder (1) can be a right angle, but may deviate therefrom. Through the gas- chamber (3) with the inlet (3') a gas, inert with respect to the liquid, its contents and the apparatus, is intro¬ duced through the porous wall (4) , thus providing a con¬ trolled injection of gas into the film. Preferably the gas pressure and the pores in the porous wall (4) are selected such that the gas bubbles formed are in the order of
0.05-1 mm in size. If desired the gas chamber (3) may be subdivided into segments, especially if the fraction of the
liquid with the wall would cause a rotational velocity gradient in the axial direction, this section of the apparatus is the flotation section.
The liquid passing the weir (5) flows into an area (11) of an extension (6) of cylinder (1), said extension (6) having a solid wall, provided with an expansion (7), thus allowing separation of the liquid from the foam. This latter section is the liquid/foam separating section. The area (11) is provided with an adjustable bottom plate (8) , thus allowing liquid to act as a blocking device. The liquid, comprising non-flotated particles, is allowed to discharge from the flotation cyclone by way of an open area (12) between the bottom plate (8) and the outmost wall of the expansion (7). The bottom plate (8) should be positioned in such a way that some liquid is present over the outlet openings at all times in order to prevent gas (foam) from discharging at that end. It should be observed, that the shape of the separation area (11) is not relevant, as mentioned above.
The foam created in porous cylinder (1) comprising the flotated particles therein, will fill the void area (13) of said cylinder (1). The liquid as a blocking device, caused by the bottom plate (8), causes that the foam is compelled to emerge from the flotation cyclone by way of the vortex- finder (10). The length of said vortexfinder (10) may vary from as little as the thickness of the lid up to the full length of the porous wall or even longer. The void area (13) acts as a foam draining chamber, thus increasing the selectivity of the flotation procedure.
The lid of the cylinder (1) is shown in Fig. 2, where the opening of the vortexfinder (10) has beem omitted.
With the flotation cyclone as outlined above an improvement in the separation yield of from 10% up to 30% or even higher may be achieved. Example
A flotation cyclone according to the drawings was fed with a sludge containing leadsulfide (PbS) in an mount cor¬ responding with 13000 ppm Pb. After treatment in the flotation cyclone the lead content had been removed for about 80%. In the remaining total of 40% of dry matter the concentration of Pb had been reduced to 4800 ppm Pb.
It will be obvious that the above apparatus may be modified or varied in various ways, such as for example by replacing the particles by molecules or ions, either alone or in combination without departing from the inventive concept.

Claims

Claims :
1. A flotation cyclone, comprising a cylinder (1), having a porous wall (4), provided with a tangential inlet
(2) , a gaschamber (3) with an inlet (3') , surrounding the porous wall (4) of the cylinder (1), at the lower end of said porous wall (4) a weir (5), an extension (6) of the cylinder (1), having a solid wall, provided at its lower end with a liquid as a blocking device.
2. A flotation cyclone according to claim 1, charac¬ terised in that the liquid as a blocking device comprises an expansion (7) at the lower end of the extension (6) , an adjustable bottom plate (8), fitting in said expansion (7), thus forming liquid outlet (9) .
3. A flotation cyclone according to claim 1 or 2, characterised in that the cylinder (1) is provided at its upper end with a foam outlet vortexfinder (10).
4. A flotation cyclone according to claim 2 or 3, characterised in that the bottom plate (8) is positioned in such a way that a liquid as a blocking device is maintained over outlet opening (9) during operation of the cyclone.
5. A flotation cyclone according to any one of claims 1-4, characterised in that the weir (5) has an annular shape.
PCT/NL1991/000095 1990-06-15 1991-06-11 Flotation cyclone Ceased WO1991019572A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US07/955,887 US5322169A (en) 1990-06-15 1991-06-11 Flotation cyclone
EP91912170A EP0544683B1 (en) 1990-06-15 1991-06-11 Flotation cyclone
DE69108247T DE69108247T2 (en) 1990-06-15 1991-06-11 FLOTATION CYCLE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP90201542 1990-06-15
EP90201542.9 1990-06-15

Publications (1)

Publication Number Publication Date
WO1991019572A1 true WO1991019572A1 (en) 1991-12-26

Family

ID=8205033

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1991/000095 Ceased WO1991019572A1 (en) 1990-06-15 1991-06-11 Flotation cyclone

Country Status (6)

Country Link
US (1) US5322169A (en)
EP (1) EP0544683B1 (en)
AT (1) ATE119806T1 (en)
AU (1) AU8055591A (en)
DE (1) DE69108247T2 (en)
WO (1) WO1991019572A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013042084A2 (en) 2011-09-22 2013-03-28 Cydaf Technologies Limited Apparatus for separation and processing of materials

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6773603B2 (en) * 2000-03-13 2004-08-10 Intellectual Capital Enterprises, Inc. Chemical removal and suspended solids separation pre-treatment system
GB0216955D0 (en) * 2002-07-20 2002-08-28 Hoover Ltd Cyclonic vacuum cleaner
DE102004009686B3 (en) * 2004-02-27 2005-09-01 Schambeck Sfd Gmbh Evaporative light scattering detector, for use with high pressure liquid chromatography, has a rotating chamber where an aerosol has a rotary movement with the eluent passing through a drying section into the detection chamber
FR2892953B1 (en) * 2005-11-09 2008-06-27 Saipem S A Sa METHOD AND DEVICE FOR SEPARATING POLYPHASE LIQUID
GB201222483D0 (en) * 2012-12-13 2013-01-30 Enhydra Ltd Flotation apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2102525A (en) * 1936-03-11 1937-12-14 Nichols Eng & Res Corp Separation of solid particles from fluids
DE1168868B (en) * 1958-11-11 1964-04-30 Waldhof Zellstoff Fab Method for breaking foams
US4226708A (en) * 1977-02-24 1980-10-07 Coal Processing Equipment, Inc. Variable wall and vortex finder hydrocyclone classifier
US4397741A (en) * 1980-08-29 1983-08-09 University Of Utah Apparatus and method for separating particles from a fluid suspension
WO1990000646A1 (en) * 1988-07-08 1990-01-25 Wikdahl Nils Anders Lennart A method and arrangement for cleansing a fibre suspension from light contaminants

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1134443A (en) * 1954-06-30 1957-04-11 Bataafsche Petroleum Cyclone or swirl chamber with diffuser
US3802570A (en) * 1972-10-25 1974-04-09 M Dehne Cyclone separator
AU6140273A (en) * 1972-11-03 1975-04-17 Xci Australia Limited Apparatus
US4094783A (en) * 1977-09-29 1978-06-13 Jackson George F Centrifugal flotation separator
US4279743A (en) * 1979-11-15 1981-07-21 University Of Utah Air-sparged hydrocyclone and method
US4838434A (en) * 1979-11-15 1989-06-13 University Of Utah Air sparged hydrocyclone flotation apparatus and methods for separating particles from a particulate suspension
US4744890A (en) * 1979-11-15 1988-05-17 University Of Utah Flotation apparatus and method
FR2579638B1 (en) * 1985-03-29 1988-09-02 Lamort E & M APPARATUS FOR INKING PAPER PULP
US4971685A (en) * 1989-04-11 1990-11-20 The United States Of America As Represented By The Secretary Of The Interior Bubble injected hydrocyclone flotation cell
US4997549A (en) * 1989-09-19 1991-03-05 Advanced Processing Technologies, Inc. Air-sparged hydrocyclone separator
US5224604A (en) * 1990-04-11 1993-07-06 Hydro Processing & Mining Ltd. Apparatus and method for separation of wet and dry particles
US5069751A (en) * 1990-08-09 1991-12-03 Kamyr, Inc. Hydrocyclone deinking of paper during recycling
US5131980A (en) * 1990-08-09 1992-07-21 Kamyr, Inc. Hydrocyclone removal of sticky contaminants during paper recycling
US5173177A (en) * 1991-03-27 1992-12-22 Kamyr, Inc. Anti-plugging adjustable orifice for gas sparged hydrocyclone
US5192423A (en) * 1992-01-06 1993-03-09 Hydro Processing & Mining Ltd. Apparatus and method for separation of wet particles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2102525A (en) * 1936-03-11 1937-12-14 Nichols Eng & Res Corp Separation of solid particles from fluids
DE1168868B (en) * 1958-11-11 1964-04-30 Waldhof Zellstoff Fab Method for breaking foams
US4226708A (en) * 1977-02-24 1980-10-07 Coal Processing Equipment, Inc. Variable wall and vortex finder hydrocyclone classifier
US4397741A (en) * 1980-08-29 1983-08-09 University Of Utah Apparatus and method for separating particles from a fluid suspension
WO1990000646A1 (en) * 1988-07-08 1990-01-25 Wikdahl Nils Anders Lennart A method and arrangement for cleansing a fibre suspension from light contaminants

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013042084A2 (en) 2011-09-22 2013-03-28 Cydaf Technologies Limited Apparatus for separation and processing of materials

Also Published As

Publication number Publication date
ATE119806T1 (en) 1995-04-15
US5322169A (en) 1994-06-21
EP0544683A1 (en) 1993-06-09
EP0544683B1 (en) 1995-03-15
AU8055591A (en) 1992-01-07
DE69108247D1 (en) 1995-04-20
DE69108247T2 (en) 1995-11-09

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