US3802569A - Flotation machine - Google Patents

Flotation machine Download PDF

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Publication number
US3802569A
US3802569A US00287269A US28726972A US3802569A US 3802569 A US3802569 A US 3802569A US 00287269 A US00287269 A US 00287269A US 28726972 A US28726972 A US 28726972A US 3802569 A US3802569 A US 3802569A
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United States
Prior art keywords
froth
wall
cell
flotation
flotation machine
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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US00287269A
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English (en)
Inventor
T 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
    • B03D1/24—Pneumatic
    • 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
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1493—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

Definitions

  • ABSTRACT A flotation machine for recovering valuables or concentrates from a raw material, which comprises: a flotation cell having at least one froth-discharging opening located at the lower part of a side wall of said cell; an agitating means fitted within the centralpart of said cell; and at least one froth-discharging pipe fixed within said cell, the one end opening of said pipe being connected with said froth-discharging opening of said cell and the other end opening of said pipe being held at a level lower than the upper end of said side wall but higher than the surface level of the pulp or liquid charged to be subjected to flotation, thereby forming at least one froth-discharging passage within said cell.
  • the present invention relates to a flotation machine for the purpose of recovering valuables or concentrates through flotation of ores or recovering ions contained in a liquid or recovering particles contained in a liquid resulting from reaction between said ions and a reagent applied upon concentrating them by flotation.
  • FIG. 1 of the appended drawings the numeral reference 1 denotes the impeller shaft connected with the impeller (which is not shown herein), denotes the flotation cell, and 6 denotes the trough for discharging the froth 9 (i.e., the aggregate of bubbles whereon minerals, ions or solid particles resulting from reaction between the ions and a reagent are adhering).
  • the froth 9 i.e., the aggregate of bubbles whereon minerals, ions or solid particles resulting from reaction between the ions and a reagent are adhering.
  • the so-called mechanically agitated flotation machine of such construction as above agitation-of the ore pulp or liquid and mixing of the air are simultaneously performed, and as a result, the bubbles generated in the pulp or liquid come up to the surface of the pulp or liquid within the flotation machine andto said bubbles are adhered minerals, ions, or solid particles resulting from reaction between said ions and a reagent, to thereby form a froth.
  • This froth is discharged into the frothdischarging trough through the froth-discharging discharging opening provided on a portion wall at the surrounding of the upper end of the flotation machine.
  • the froth formed in the vicinity of the froth-discharging opening or the froth-discharging trough is apt to be discharged faster than the froth formed in the other parts.
  • the froth formed in a part distant from the frothdischarging opening tends to stay for a long time on the surface of the pulp or liquid before it is discharged.
  • a part of the bubbles within the froth disappear and the suspended matter once floated off the pulp or liquid is put back in the pulp or liquid again, causing the flotation efficiency to decrease.
  • the object of the present invention is to provide an improved flotation machine which renders it possible to discharge the froth formed on the surface of the pulp or liquid in a very short time.
  • the present invention features the provision of at least one hollow cylinder or froth-discharging pipe for the above flotation machine for the purpose of rapidly discharging the froth to the outside of the machine.
  • said hollow cylinder froth-discharging pipe
  • said hollow cylinder froth-discharging pipe
  • the lower end opening of the hollow cylinder is connected with a froth-discharging opening located at an appropriate place in the lower part of a side wall of the flotation cell.
  • FIG. 1 is a perspective view of a prior art mechanically agitated flotation machine.
  • FIG. 2 is a perspective view of an embodiment of a mechanically agitated flotation machine according to thepresent invention.
  • FIG. 3 is a central sectional view of the flotation machine of FIG. 2.
  • FIG. 4 is a perspective view of another embodiment of a mechanically agitated flotation machine according to the present invention.
  • FIG. 5 is a central sectional view of the flotation machine of FIG. 4.
  • FIG. 6 is a plan view of the flotation machine of FIG. 4.
  • FIG. 7 is a plan view of still another embodiment of the mechanically agitated flotation machine according to the present invention.
  • the numeral reference ll denotes the impeller shaft
  • 12 denotes the stand pipe (which constitutes the hollow cylinder for air-blowing purpose and the inner wall of the hollow cylinder for froth-discharging purpose)
  • l3 denotes the impeller
  • 14 denotes the guide vane (or stabilizer)
  • 15 denotes the flotation cell
  • 16 denotes the frothdischarging trough
  • 17 denotes the hollow cylinder for froth-discharging purpose
  • 18 denotes the coupling pipe to interconnect the froth-discharging opening 18 and said hollow cylinder.
  • a cylindrical tube is most convenient for shaping, but other shapes such as triangular tube, a square tube and a polygonal tube are also applicable.
  • the material for the frothdischarging hollow cylinder the known materials for the conventional flotation machine, such as carbon steel, stainless steel, synthetic resin, etc., can be employed at ones discretion. Besides, it will do to make the fixed elevation of the upper end opening of the froth-discharging hollow cylinder adjustable in the vertical direction to thereby make it possible to modify optionally the rate of froth discharge to the frothdischarging trough and to the froth-discharging hollow cylinder according to the condition of flotation.
  • the ratio of the total surface area of the upper and opening of the froth-discharging hollow cylinder to the surface area of the froth-forming zone may be modified optionally according to the condition of flotation. But, according to the present invention, it is preferable to adjust the ratio of the total surface area of the upper end opening of said hollow cylinder to the surface area of the froth-forming zone of the flotation cell to be in the range of from l/l to II].
  • FIGS. 4 through 6 show a flotation machine wherein the froth-discharging hollow cylinder is installed in a cylindrical flotation cell instead of a square flotation cell such as shown in FIG. 2 and FIG. 3.
  • an upper froth-deflecting guide vane 20 an impeller shaft 21, a stand pipe 22, an impeller 23, lower guide vanes 24, a flotation cell wall 25, a froth discharging trough 26, a hollow cylinder 27 for froth discharging purposes, and a coupling pipe 28 to connect said cylinder 27 to froth-discharging opening 28.
  • the arrow 29 indicates the direction of flow to the froth.
  • this is a flotation machine devised to guide and impart movement to the layer of froth.
  • FIG. 7 is the plan view of a mechanically agitated flotation machine as devised to guide and impart movement to the froth layer and this machine is equipped with the froth-deflecting vane 40
  • FIG. 7 illustrates the location of said froth deflecting vane 40 and the direction of its curvature.
  • the froth in case the froth is made to rotate in the direction of the arrow, it can be discharged through the center of the machine exclusively, not through the surrounding wall thereof.
  • the outer froth-discharging trough is not always required; the discharge of the froth can be sufficiently effected by enlarging the diameter of the froth-discharging hollow cylinder.
  • the froth-deflective vane 40 is of the same shape as the froth-deflective vane 20 in FIG. 4 excepting that it is convex in the direction of the rotation of the froth, the two ends of said vane being fixed on the inner wall of the flotation cell 35 and the outer wall of the frothdischarging hollow cylinder 37 respectively.
  • the numeral reference 31 denotes the impeller shaft, 32 denotes the stand pipe and arrow 39 denotes the direction in which the froth is discharged.
  • the above described flotation machines according to the present invention are of such construction that a double-wall froth-discharging hollow cylinder is fitted on an impeller shaft.
  • TEST 1 Flotation of zinc ores was conducted by employing a flotation machine according to the present invention, such as shown in FIG. 4 and FIG. 5 (said flotation machine being l,675 mm in the inside diameter of the flotation cell, 1,000 mm in height, 500 mm in the inside diameter of the froth-discharging hollow cylinder and 200 mm in the inside diameter of the stand pipe).
  • flotation of zinc ores was conducted by employing a conventional flotation machine obtained by removing the froth-discharging hollow cylinder from the above flotation machine for the purpose of comparison.
  • the flotation efficiency of the flotation machine according to the present invention is by far superior to that of the comparative flotation machine.
  • a flotation machine comprising;
  • a flotation cell having an upright side wall, said side wall having a froth-discharging opening located close to the lower end thereof,
  • double-walled hollow cylinder disposed within the central portion of said cell and extending downwardly therein to a position close to the bottom of said cell, said cylinder being defined by an upright inner wall and an upright outer wall encircling and spaced outwardly from said inner wall and defining therewith a passage through which froth can flow downwardly, the bottom end of said passage being closed and the upper end of the passage being open so that froth can flow into said passage at the upper end thereof, the upper end of said outer wall being located at a position below the upper end of the side wall of the cell and higher than the upper surface of the liquid substance subjected to flotation in the cell;
  • a flotation machine in which said inner wall extends above the upper end of said outer wall.
  • a flotation machine in which said agitating means comprises an upright rotatable impeller shaft extending inside of and being spaced from said inner wall, and an impeller secured to the lower end of said shaft and disposed directly below the bottom of said cylinder.
  • a flotation machine in which a froth deflecting vane extends between said side wall of said cell and the upper end of said outer wall of said hollow cylinder for deflecting froth into the upper end of said passage.
  • a flotation machine including a froth discharging trough attached to the upper end of said side wall of said cell.
  • a flotation machine including a froth-discharging trough attached to the upper end of said side wall of said cell.
  • a flotation machine in which the bottom end of said passage is closed by an imperforate bottom wall which extends transversely between the lower ends of said inner and outer walls.
  • a flotation machine in which said bottom wall slopes downwardly in a direction from said inner wall toward saidouter wall, and said pipe is connected to and slopes downwardly away from the lower end of said outer wall.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Physical Water Treatments (AREA)
US00287269A 1971-09-14 1972-09-08 Flotation machine Expired - Lifetime US3802569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46071605A JPS5115482B2 (xx) 1971-09-14 1971-09-14

Publications (1)

Publication Number Publication Date
US3802569A true US3802569A (en) 1974-04-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00287269A Expired - Lifetime US3802569A (en) 1971-09-14 1972-09-08 Flotation machine

Country Status (7)

Country Link
US (1) US3802569A (xx)
JP (1) JPS5115482B2 (xx)
AU (1) AU472445B2 (xx)
CA (1) CA966942A (xx)
DE (1) DE2244303C3 (xx)
FR (1) FR2152976B1 (xx)
SE (1) SE384327B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5431286A (en) * 1994-01-06 1995-07-11 Inco Limited Recirculating column flotation apparatus
US6095336A (en) * 1997-08-29 2000-08-01 Baker Hughes Incorporated Flotation cell with radial launders for enhancing froth removal
US20060169644A1 (en) * 2005-02-02 2006-08-03 Petreco International, Inc. Single-cell mechanical flotation system
US20100167339A1 (en) * 2007-06-19 2010-07-01 Eastman Chemical Company Process for microalgae conditioning and concentration

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55133799U (xx) * 1979-03-16 1980-09-22
JPS57186857U (xx) * 1981-05-18 1982-11-27
JPS62190497U (xx) * 1987-04-22 1987-12-03
DE102008014791A1 (de) * 2008-03-18 2009-09-24 Siemens Aktiengesellschaft Flotationszelle zur Gewinnung von Wertstoffpartikeln

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875897A (en) * 1953-06-22 1959-03-03 Booth Lionel Earl Flotation machine
US2944802A (en) * 1955-02-16 1960-07-12 Denver Equip Co Froth flotation and aeration apparatus
US3342331A (en) * 1965-05-24 1967-09-19 Maxwell John Russell Flotation machine
US3428175A (en) * 1965-06-14 1969-02-18 Outokumpu Oy Process and apparatus for froth flotation
US3437203A (en) * 1963-02-20 1969-04-08 Koichi Nakamura Flotation apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE392241C (de) * 1923-04-12 1924-03-24 Ver Kolenmij En Ter Voortzetti Vorrichtung zum Abstreichen bzw. Entfernen von auf Fluessigkeit schwimmendem Schaum
US2316770A (en) * 1940-05-27 1943-04-20 Mining Process & Patent Co Froth flotation apparatus and treatment
US2612358A (en) * 1947-06-14 1952-09-30 Mining Process & Patent Co Pumping-type flotation apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875897A (en) * 1953-06-22 1959-03-03 Booth Lionel Earl Flotation machine
US2944802A (en) * 1955-02-16 1960-07-12 Denver Equip Co Froth flotation and aeration apparatus
US3437203A (en) * 1963-02-20 1969-04-08 Koichi Nakamura Flotation apparatus
US3342331A (en) * 1965-05-24 1967-09-19 Maxwell John Russell Flotation machine
US3428175A (en) * 1965-06-14 1969-02-18 Outokumpu Oy Process and apparatus for froth flotation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Denver Sub A Flotation, Denver Equipment Co., Bulletin No. F10. B29, 8/5/49, pages 10 13. *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5431286A (en) * 1994-01-06 1995-07-11 Inco Limited Recirculating column flotation apparatus
US6095336A (en) * 1997-08-29 2000-08-01 Baker Hughes Incorporated Flotation cell with radial launders for enhancing froth removal
US20060169644A1 (en) * 2005-02-02 2006-08-03 Petreco International, Inc. Single-cell mechanical flotation system
US7438809B2 (en) * 2005-02-02 2008-10-21 Petreco International Inc. Single-cell mechanical flotation system
US20100167339A1 (en) * 2007-06-19 2010-07-01 Eastman Chemical Company Process for microalgae conditioning and concentration
US20100176062A1 (en) * 2007-06-19 2010-07-15 Eastman Chemical Company Process and apparatus for adsorptive bubble separation using a dense foam
US20100181234A1 (en) * 2007-06-19 2010-07-22 Eastman Chemical Company Process and apparatus for adsorptive bubble separation
US8196750B2 (en) 2007-06-19 2012-06-12 Renewable Algal Energy, Llc Process and apparatus for adsorptive bubble separation using a dense foam
US8251228B2 (en) * 2007-06-19 2012-08-28 Renewable Algal Energy, Llc Process and apparatus for adsorptive bubble separation
US8512998B2 (en) 2007-06-19 2013-08-20 Renewable Algal Energy, Llc Process for microalgae conditioning and concentration
US9358553B2 (en) 2007-06-19 2016-06-07 Renewable Algal Energy, Llc Process for microalgae conditioning and concentration

Also Published As

Publication number Publication date
JPS4837301A (xx) 1973-06-01
CA966942A (en) 1975-04-29
FR2152976B1 (xx) 1977-07-29
DE2244303A1 (de) 1973-03-29
FR2152976A1 (xx) 1973-04-27
AU4658772A (en) 1974-03-21
AU472445B2 (en) 1976-05-27
DE2244303B2 (de) 1981-05-21
DE2244303C3 (de) 1981-12-17
JPS5115482B2 (xx) 1976-05-17
SE384327B (sv) 1976-05-03

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