US3864438A - Flotation machine - Google Patents

Flotation machine Download PDF

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Publication number
US3864438A
US3864438A US341675A US34167573A US3864438A US 3864438 A US3864438 A US 3864438A US 341675 A US341675 A US 341675A US 34167573 A US34167573 A US 34167573A US 3864438 A US3864438 A US 3864438A
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United States
Prior art keywords
impeller
liquid
air
dispersing unit
cell
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
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US341675A
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English (en)
Inventor
Tatsuya Nagahama
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.)
Mitsui Mining and Smelting Co Ltd
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Mitsui Mining and Smelting Co Ltd
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Publication date
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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
    • B03D1/16—Flotation machines with impellers; Subaeration 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
    • B03D1/1493—Flotation machines with means for establishing a specified flow pattern
    • 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
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B03D1/20—Flotation machines with impellers; Subaeration machines with internal air pumps

Definitions

  • ABSTRACT A flotation machine comprising a flotation cell having therein an air inlet pipe for introducing air into the liquid being treated, a rotating body for agitating the liquid, and a dispersing unit having a plurality of guide vanes characterized'by the improvement in which projection portions are provided in the flow passages for the liquid formed between the guide vanes.
  • the flotation machine is required to provide the O function of generating air bubbles in the liquid, or slurry of solids and liquid being treated therein.
  • the material desired to be separated from the flotation liquid adheres to the bubbles so that it rises to the surface of the tank or cell with the bubbles. Therefore it is desired that the flotation machine be capable of generating a large amount of bubbles because the flotation efficiency can be increased in proportion to the amount of generated air bubbles to a certain degree.
  • the amount of bubbles generated in the cell has been controlled to a certain degree by regulating the kind and amount of the flotation agent that is employed. But in general, the amount of bubbles generated depends on the amount of air that is introduced into the cell.
  • the amount of air introduced into the cell has heretofore been increased by increasing the speed of rotation of the agitator or impeller or by blowing in a large amount of air progressively into the cell of the flotation machine.
  • the amount of air introduced into the cell is increased by increasing the speed of rotation of the rotating body of the flotation machine, there are the-drawbacks that the consumption of power is increased and the amount of wear of the rotating body and its supporting mechanical structure is increased.
  • air is blown' progressively into the cell, there is the drawback that extra equipment and power are required for the preparation and supply of the pressurized air.
  • the present invention is intended to provide an improved flotation machine capable of improving the flo-' tation efficiency by increasing the surface area of the generated air bubbles, but without necessarily increasing the total volume'of air sucked into the cell.
  • the inventor has discovered, as a result of numerous studies, that the surface areaof the bubbles generated by suction of air can be increased in a flotation machine employing an air suction pipe, such as a stand pipe or a hollow shaft, positioned in parallel with the vertical axis of the flotation cell, a rotating body for effecting agitation of the flotation liquid and a dispersing unit consisting of a plurality of guide vanes provided at the bottom portion of the flotation cell.
  • an air suction pipe such as a stand pipe or a hollow shaft
  • the present invention is based on this discovery.
  • FIG. 1 is a partially cut-away perspective view showing the inside of a cell.
  • FIG. 2 is an enlarged, partially cut-away, plan view of the dispersing unit of the FIG. 1.
  • FIG. 3 is a perspective view of a guide vane.
  • FIG. 4 is a perspective view of a modified guide vane.
  • The'structure of the flotation machine except for the structure of the guide vanes of the dispersing unit as shown in the drawings is generally similar to that of a conventional flotation machine and it will be described only briefly.
  • the apparatus comprises a flotation cell 1 having a rotating body or impeller 2 for drawing air into the cell and circulating the liquid through the cell.
  • the impeller 2 is rotated by a shaft 3.
  • An air inlet pipe 4 encircles and is spaced from the shaft 3.
  • a stationary dispersing unit 5 is mounted on the lower end of the pipe 4.
  • the dispersing unit 5 has a series of guide vanes, such as the vanes 6 and 7.
  • a froth discharging trough 8 is provided in the side wall of the cell at the upper end thereof.
  • the guide vanes are mounted on support rings 9 and 10.
  • projecting portions (6', 7) are provided in the passage formed between the guide vanes. It has been discovered that these projectingportions cause the air bubbles to be subdivided so that a larger number of smaller diameter-bubbles are formed, as compared with the case of the conventional dispers ing unit which has guide vanes made of curved plates and which do not have any projection portions. That is, by employing the apparatus shown in FIG. 2, the generated air bubbles are subdivided and dispersed in the flotation liquid. The mixture of air bubbles and liquid is discharged from the dispersing unit flowing in a substantially circumferential direction relative to the side wall of the flotation cell.
  • the projecting portions of the dispersing unit to be installed in the flotation machine of the present invention it is desirable to make the projecting portions integral with the guide vanes. Particularly it is preferable to provide the projecting portions onthe leading surface of the guide vanes, in the direction of rotation of the impeller, that is, on the otherwise concave sides of the vanes.
  • the shape of the projecting portions there is no particular limitation, but guide vanes having a streamline type projecting portions as shown in FIG. 3 corresponding to the guide varies in FIG. 2 or the guide vanes 11 having columnar shape projecting portion 11 as shown in FIG. 4 can be employed in the present invention.
  • the dispersing unit according to the present invention can be installed not only in circular type flotation cells as illustrated, but also in any type of the flotation.
  • a waste water having a Cu concentration of 30 ppm was supplied to each flotation machine and furthermore, ethyl xanthate and a frother were added thereto to form precipitates of Cu xanthate. Flotation was effected for minutes.
  • each guide vane has an integral projecting portion on its leading side, in the direction of rotation of said impeller, said portion projecting toward the trailing side of the adjacent leading guide vane and defining therewith a zone which converges and then diverges in a direction away from the central opening of the dispersing unit, for causing subdivision of air bubbles in the liquid.
  • said dispersing unit comprises a series of guide vanes which are forwardly curved in the direction of rotation .of said impeller, said dispersing unit being stationarily mounted on the lower end of said air inlet pipe and adjacent to the bottom wall of the cell, said dispersing unit being coaxial with the axis of the rotation of said impeller.
  • each guide vane has a concave-convex shape with the concave side thereof being the leading side of the vane in the direction of rotation of said impeller, each guide vane having a member disposed in contact with the concave side thereof and extending partway across the flow passage defined between said vane and-the convex side of the adjacent leading vane, and defining therewith a flow passage zone which converges and then diverges in a direction away from the central opening of the dispersing unit.
  • a flotation machine in which said dispersing unit comprises a series of guide vanes which are forwardly curved in the direction of rotation of said impeller, said dispersing unit being stationarily mounted on the lower end of said air inlet pipe and adjacent to the bottom wall of the cell, said dispersing 'unit being coaxial with the axis of rotation of said impeller.
  • a flotation machine comprising a flotation cell having an air inlet pipe for introducing air into the liquid being treated, a rotatable impeller for mixing the air with the liquid and circulating same in the cell, and an annular dispersing unit having a central opening in which said impeller is disposed and having a series of circumferentially spaced guide vanes defining flow passages for directing flow of the air and the liquid from the impeller, the improvement which comprises: projecting portions integral or contiguous with the guide vanes and located thereon between the central opening and the periphery of said dispersing unit, each portion projecting toward the opposing surface of the adjacent a guide vane and e'xtending'partway across the flow passage defined between said adjacent guide vanes and forming a narrowed zone in said flow passage for causing subdivision of air bubbles in the liquid, said flow passage being enlarged relative to said narrowed zone on opposite sides of said zone.
  • a flotation machine comprising a flotation cell having an air inlet pipe for introducing air into the liquid being treated, a rotatable impeller for mixing the air with the liquid and circulating same in the cell,'and an annular dispersing unit having acentral opening in which said impeller is disposed and having a series of circumferentially spaced guide vanes defining flow passages for directing flow of the air and the liquid from the impeller, the improvement which comprises: a projecting portion disposed in each of said flow passages between the opposing surfaces of the adjacent guide vanes that define the flow passage, the projecting portion being located in the flow passage between and spaced radially from said central opening and the periphery of said dispersing unit, the projecting portion extending from one side of the flow passage toward the other side of the flow passage partway across the flow partway toward the trailing side of the adjacent guide vane.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Physical Water Treatments (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Paper (AREA)
US341675A 1972-03-18 1973-03-15 Flotation machine Expired - Lifetime US3864438A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47027602A JPS5136201B2 (fr) 1972-03-18 1972-03-18

Publications (1)

Publication Number Publication Date
US3864438A true US3864438A (en) 1975-02-04

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ID=12225458

Family Applications (1)

Application Number Title Priority Date Filing Date
US341675A Expired - Lifetime US3864438A (en) 1972-03-18 1973-03-15 Flotation machine

Country Status (8)

Country Link
US (1) US3864438A (fr)
JP (1) JPS5136201B2 (fr)
AU (1) AU473767B2 (fr)
CA (1) CA993575A (fr)
DE (1) DE2312806C2 (fr)
FR (1) FR2176880B1 (fr)
SE (1) SE398826B (fr)
SU (1) SU562176A3 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973759A (en) * 1973-11-26 1976-08-10 Imi(Tami) Institute For Research And Development Liquid-liquid mixer
US4472271A (en) * 1982-08-25 1984-09-18 Freeport Kaolin Company Froth flotation apparatus and process
US4483624A (en) * 1982-08-25 1984-11-20 Freeport Kaolin Company High intensity conditioning mill and method
US5160459A (en) * 1990-11-27 1992-11-03 Claudio Guarnaschelli Fluid mixer
US5660766A (en) * 1995-09-22 1997-08-26 Van Dyek; Bernhard Aerator
US20030107950A1 (en) * 2000-01-11 2003-06-12 Shepherd Ian Clarence Apparatus for mixing
US20090110559A1 (en) * 2007-10-25 2009-04-30 Midan Industries Ltd. Submersible mixing propeller
US20090213684A1 (en) * 2007-10-25 2009-08-27 Midan Industries Ltd. Apparatus for distribution of a gas into a body of liquid
WO2014042655A1 (fr) * 2012-09-17 2014-03-20 Arribau Jorge Appareil mélangeur et procédé

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54107901U (fr) * 1978-01-17 1979-07-30
DE2852023C2 (de) * 1978-12-01 1980-08-28 J.M. Voith Gmbh, 7920 Heidenheim Vorrichtung zum Einleiten einer Faserstoffsuspension in einen Flotationsbehälter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070229A (en) * 1958-07-21 1962-12-25 Loro & Parisini Spa Apparatus for the froth-flotation of minerals
US3409130A (en) * 1967-09-14 1968-11-05 Nakamura Koichi Flotation apparatus
US3778034A (en) * 1969-07-17 1973-12-11 W Giebel Agitator assembly for recovery of minerals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070229A (en) * 1958-07-21 1962-12-25 Loro & Parisini Spa Apparatus for the froth-flotation of minerals
US3409130A (en) * 1967-09-14 1968-11-05 Nakamura Koichi Flotation apparatus
US3778034A (en) * 1969-07-17 1973-12-11 W Giebel Agitator assembly for recovery of minerals

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973759A (en) * 1973-11-26 1976-08-10 Imi(Tami) Institute For Research And Development Liquid-liquid mixer
US4472271A (en) * 1982-08-25 1984-09-18 Freeport Kaolin Company Froth flotation apparatus and process
US4483624A (en) * 1982-08-25 1984-11-20 Freeport Kaolin Company High intensity conditioning mill and method
US5160459A (en) * 1990-11-27 1992-11-03 Claudio Guarnaschelli Fluid mixer
US5660766A (en) * 1995-09-22 1997-08-26 Van Dyek; Bernhard Aerator
US6126150A (en) * 1995-09-22 2000-10-03 Van Dyk; Bernhard Submersible mixing impeller
US20030107950A1 (en) * 2000-01-11 2003-06-12 Shepherd Ian Clarence Apparatus for mixing
US20090110559A1 (en) * 2007-10-25 2009-04-30 Midan Industries Ltd. Submersible mixing propeller
US20090213684A1 (en) * 2007-10-25 2009-08-27 Midan Industries Ltd. Apparatus for distribution of a gas into a body of liquid
US7997788B2 (en) 2007-10-25 2011-08-16 Midan Industries Ltd. Submersible mixing propeller
WO2014042655A1 (fr) * 2012-09-17 2014-03-20 Arribau Jorge Appareil mélangeur et procédé
CN104812471A (zh) * 2012-09-17 2015-07-29 诺夫康铎有限责任公司 搅拌器装置和方法
CN104812471B (zh) * 2012-09-17 2016-11-09 诺夫康铎有限责任公司 搅拌器装置和方法

Also Published As

Publication number Publication date
CA993575A (en) 1976-07-20
FR2176880B1 (fr) 1977-08-26
FR2176880A1 (fr) 1973-11-02
SU562176A3 (ru) 1977-06-15
SE398826B (sv) 1978-01-23
AU473767B2 (en) 1976-07-01
JPS4895305A (fr) 1973-12-07
DE2312806A1 (de) 1973-10-04
AU5349173A (en) 1974-09-19
JPS5136201B2 (fr) 1976-10-07
DE2312806C2 (de) 1982-07-08

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