US3842004A - Flotation machine - Google Patents

Flotation machine Download PDF

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Publication number
US3842004A
US3842004A US00324199A US32419973A US3842004A US 3842004 A US3842004 A US 3842004A US 00324199 A US00324199 A US 00324199A US 32419973 A US32419973 A US 32419973A US 3842004 A US3842004 A US 3842004A
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US
United States
Prior art keywords
cell
flotation
liquid
froth
opening
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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US00324199A
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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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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage 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
    • B03D1/1406—Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
    • 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
    • B03D1/16—Flotation machines with impellers; Subaeration machines

Definitions

  • the flotation cell is provided on its side wall with one opening to feed the liquid for flotation and one opening to discharge the liquid for flotation.
  • the discharge opening is disposed on said side wall at a vertical position level with or lower than the feed opening. Both of the feed and discharge openings open in a tangential direction, or in an approximately tangential direction, relative to the direction of movement of the liquid for flotation.
  • the present invention relates to a flotation machine.
  • FIG. 1 the numerals 1, 1' and 1 denote three flotation cells connected in serial arrangement.
  • cell 1 there is provided the impeller shaft 2, the stand pipe 3, the side wall 4, the flotation liquid feed opening 5, the flotation liquid discharge opening 6 and the froth-discharging trough 7.
  • the cells 1' and 1" are constructed similarly.
  • the means for connecting one flotation cell with the next flotation cell varies with the type of flotation machine.
  • the Warman flotation machine and the Agitair flotation machine there is provided practically no partition wall between the flotation cells.
  • the flotation cells are connected with one another either by means of the side walls of the flotation cells or by means of a part of their common side wall.
  • each flotation cell is provided with a damper or baflle, whereby the flotation liquid overflowing said damper is supposed to be sucked by an impeller through a suction pipe of the next flotation cell.
  • all of these conventional flotation machines suffer from the phenomenon of the flotation liquid short-circuiting. This short-circuiting phenomenon is especially conspicuous in the case of a flotation machine devised to rotate the flotation liquid within its flotation cells, so that here has been a demand for means for preventing said shortcircuiting in flotation machines of this type.
  • the present invention is intended to provide a flotation machine which meets the foregoing demand.
  • a flotation machine devised to move the flotation liquid in a circumferential direction within its flotation cells.
  • Each cell is provided in its side wall with an opening to feed the flotation liquid in a tangential or approximately tangential direction relative to the direction of the flow of the flotation liquid within the flotation cells, and an opening to discharge the flotation liquid after completion of the flotation in another Patented Oct. 15, 1974 tangential or approximately tangential direction relative to the direction of the flow of the flotation liquid within the flotation cells.
  • the discharge opening is disposed at a vertical position level with or lower than said feed opening.
  • FIG. 1 is a plan view of a conventional flotation machine consisting of a plural number of flotation cells connected in series
  • FIG. 2 is a plan view of a flotation machine embodying the present invention
  • FIG. 3 is a side view of the same flotation machine illustrated in FIG. 2
  • FIG. 4 is a side view of a modified flotation machine embodying the present invention
  • FIG. 5 is a plan view -of still another flotation machine embodying the present invention
  • FIG. 6 is a plan view of a flotation machine employed for the purpose of comparative tests.
  • the numbers 21, 21' and 21" denote flotation cells connected in serial arrangement.
  • the cells are constructed alike and each includes an impeller shaft 22, a stand pipe 23, a side wall 24, a flotation liquid feeding opening 25, a flotation liquid discharge opening 26, a froth-discharging trough 27, and a connecting pipe 28.
  • the arrows show the direction of flow of the flotation liquid.
  • the flotation liquid within the connecting pipes 28 is fed into each of the flotation cells through the feeding openings 25 which open in a direction approximately tangential to the flow of the liquid within each flotation cell.
  • the flotation liquid is fed through the cells in succession and, in each cell, said liquid moves circumferentially therein.
  • the flotation is carried out during this circumferential movement.
  • the flotation liquid is discharged through the outlet 26, which is disposed at a vertical level lower than the feeding opening 25, into the connecting pipe 28, the discharged liquid flowing in a substantially tangential direction relative to the flow within the flotation cell.
  • FIG. 4 illustrates another flotation machine embodying the present invention, wherein the flotation cells are connected in series with each cell being vertically lower than the preceding cell in the series.
  • a flotation machine of this type is advantageous when the flowing quantity of the flotation liquid per unit time is high.
  • the numbers 31, 31 and 31" denote the flotation cells in serial arrangement
  • 32 denotes the impeller shaft
  • 34 denotes the side wall of the flotation cell
  • 35 denotes the flotation liquid feeding opening
  • 36 denotes the flotation liquid discharging opening
  • 38 and 38' denote the connecting pipes respectively.
  • the reason for disposing the flotation liquid discharge openings at a vertical position lower than or level with the flotation liquid feeding opening, in the present invention, is that such a disposition will render the contact between the flotation liquid and the bubbles within the flotation cell more frequent than the case of disposing the discharge opening higher than the feed opening. This disposition enhances greatly the flotation efficiency.
  • the lateral spacing of the discharging opening and feeding opening in the present invention is not critical, but, in the embodiment shown in FIG. 3, where the flotation liquid moves from right to left within the connecting pipes 28, it is preferable that the discharge opening 26 be disposed to the right of and laterally spaced from opening 25. By so doing, the risk that the flotation liquid fed to the flotation cell will be discharged prior to its full movement within said cell can be minimized.
  • the same effect can be obtained from application of the present invention to a square-shaped flotation cell, as shown in FIG. 5, as well as to a round flotation cell, as shown in FIGS. 2 and 3.
  • FIG. 5 the same effect can be obtained from application of the present invention to a square-shaped flotation cell, as shown in FIG. 5, as well as to a round flotation cell, as shown in FIGS. 2 and 3.
  • the numbers 41, 41 and 41" denote the flotation cells connected in serial arrangement
  • 42 denotes the impeller shaft
  • 43 denotes the stand pipe
  • 44 denotes the side Wall of the flotation cell
  • 45 denotes the flotation liquid feeding opening
  • 46 denotes the flotation liquid discharge opening.
  • a flotation machine has the advantages that, not only is the occurrence of the phenomenon of the flotation liquid short-circuiting prevented, resulting in an enhancement of the flotation efficiency as discussed in the foregoing, but also the power necessary for driving the flotation machine can be minimized inasmuch as the direction of feeding and discharging the flotation liquid is identical with the direction of its movement within the flotation cell.
  • the numbers 51, 51 and 51" denote the flotation cells connected in serial arrangement
  • 52 denotes the impeller shaft
  • 53 denotes the stand pipe
  • 54 denotes the side wall of flotation cell
  • 57 denotes the frothdischarging trough.
  • Test 1 This example is illustrative of flotation of ions. That is, flotation was effected by adding sodium ethyl xanthate and a frother to an industrial waste water having a Cu++ concentration of 30 ppm. to form precipitates of Cu xanthate. The results were as shown in the following table.
  • This example is illustrative of flotation by precipitation. That is, flotation was effected by adding sodium sulfide to an industrial waste water having Cd++ concentration of 2 ppm. to form precipitates of CdS, and then adding sodium ethyl xanthate and a frother. The results were as shown in the following table.
  • Flotation machine according to present invention 3. 5 1. 7 98. 3 Comparative flotation machine. 9.0 4. 5 95. 5
  • Test 4 This example is illustrative of flotation of ores. That is, a zinc ore having a zinc content of 4.5% was crushed into grains comprising 18% by weight of grains having a grain size of -65 mesh, and then a pulp having 40% concentration of said grains was prepared. -By adding copper sulfate, sodium ethyl xanthate and a frother to this pulp, flotation was effected. The results were as shown in the following table.
  • Tailings ore Flotation machine Tailings ore Flotation machine:
  • Flotation machine according to the present invention 0. 08 2. 0 98. 0 Comparative flotation machine 0. 20 5. 0 95. 0
  • a froth apparatus comprising side and bottom Wall means defining a cell for holding a flotation liquid to be treated, feed means for feeding said liquid into said cell, discharge means for discharging said liquid from the cell after said liquid has been subjected to flotation therein, froth removal means at the upper end of the cell for discharging froth from the cell, an upright impeller shaft extending downwardly into the cell for circulating the flotation liquid around the circumference of the cell, and means for supplying gas into said cell in the vicinity of said impeller shaft for mixing the gas with the flotation liquid to generate in the cell a froth enriched with a selected component of said flotation liquid, which froth rises to the surface of the liquid and is discharged from the cell by said froth removal means, wherein the improvement comprises: said feed means is a feed opening in the side wall of the cell, disposed close to the bottom wall thereof and opening into the cell in a direction substantially tangential to the direction of movement of the flotation liquid in the cell; and
  • said discharge means is a discharge opening in the side wall of the cell at a location circumferentially spaced from said feed opening and opening into the cell in a direction substantially tangential to the direction of movement of the flotation liquid in the cell, said discharge opening being located on said side wall at a position not higher than the position of said feed opening.
  • a froth flotation apparatus in which the discharge opening is laterally spaced from the feed opening so that the included angle defined by imaginary lines drawn from the feed and discharge openings to the center of said cell is less than whereby the flotation liquid flows through an arc of more than V 180 within said cell.
  • a froth flotation apparatus in which said included angle is less than about 90 and greater than 0".
  • a froth flotation apparatus in which said means for supplying gas comprises a stand pipe surrounding said shaft and said froth removal means is a trough communicating with the upper end of said cell and disposed along the side wall thereof.
  • a froth flotation apparatus comprising a plurality of said cells connected in series with the discharge opening of each cell being connected by a conduit to the feed opening of the following cell in the series.
  • a froth flotation apparatus in which the cells lie in substantially the same horizontal plane and the conduits connecting adjacent cells in the series are inclined upwardly with respect to the horizontal in the direction of flow of the flotation liquid.
  • a flotation machine in which the cells are disposed at progressively lower vertical levels and the conduits connecting adjacent cells in the series are inclined downwardly with respect to the horizontal in the direction of flow of the flotation liquid.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physical Water Treatments (AREA)
  • Paper (AREA)
US00324199A 1972-01-22 1973-01-16 Flotation machine Expired - Lifetime US3842004A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP843272A JPS5714931B2 (no) 1972-01-22 1972-01-22

Publications (1)

Publication Number Publication Date
US3842004A true US3842004A (en) 1974-10-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00324199A Expired - Lifetime US3842004A (en) 1972-01-22 1973-01-16 Flotation machine

Country Status (8)

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US (1) US3842004A (no)
JP (1) JPS5714931B2 (no)
AU (1) AU472880B2 (no)
CA (1) CA992225A (no)
DE (1) DE2301690C2 (no)
FR (1) FR2223088B1 (no)
SE (1) SE389278B (no)
SU (1) SU604466A3 (no)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959144A (en) * 1974-11-15 1976-05-25 Agrotechnika, Narodny Podnik Apparatus for biological and chemical purification of water by agglomeration
US4002561A (en) * 1974-11-20 1977-01-11 Traverse Charles E Method and apparatus for aerobic sewage treatment
US4031006A (en) * 1976-03-12 1977-06-21 Swift And Company Limited Vortex coagulation means and method for wastewater clarification
US4186094A (en) * 1976-04-12 1980-01-29 Swemac S.A. Apparatus for eliminating by flotation impurities in the form of solid particles contained in a liquid
US4208276A (en) * 1976-07-13 1980-06-17 Bergwerksverband Gmbh Flotation plant
US4362627A (en) * 1978-09-13 1982-12-07 Fly Anderson B Cellular flow system and method
US6073775A (en) * 1999-01-19 2000-06-13 Liu; Jiongtian Cyclonic-static micro-bubble floatation apparatus and method
US6126815A (en) * 1999-07-19 2000-10-03 Kelada; Maher I. Sequential air dissolved floatation apparatus and methods
US6893572B2 (en) 2001-07-12 2005-05-17 Western Environmental Engineering Company Solids accumulating flotation separator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003901208A0 (en) 2003-03-17 2003-04-03 Outokumpu Oyj A flotation device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959144A (en) * 1974-11-15 1976-05-25 Agrotechnika, Narodny Podnik Apparatus for biological and chemical purification of water by agglomeration
US4002561A (en) * 1974-11-20 1977-01-11 Traverse Charles E Method and apparatus for aerobic sewage treatment
US4031006A (en) * 1976-03-12 1977-06-21 Swift And Company Limited Vortex coagulation means and method for wastewater clarification
US4186094A (en) * 1976-04-12 1980-01-29 Swemac S.A. Apparatus for eliminating by flotation impurities in the form of solid particles contained in a liquid
US4208276A (en) * 1976-07-13 1980-06-17 Bergwerksverband Gmbh Flotation plant
US4362627A (en) * 1978-09-13 1982-12-07 Fly Anderson B Cellular flow system and method
US6073775A (en) * 1999-01-19 2000-06-13 Liu; Jiongtian Cyclonic-static micro-bubble floatation apparatus and method
US6126815A (en) * 1999-07-19 2000-10-03 Kelada; Maher I. Sequential air dissolved floatation apparatus and methods
US6893572B2 (en) 2001-07-12 2005-05-17 Western Environmental Engineering Company Solids accumulating flotation separator

Also Published As

Publication number Publication date
CA992225A (en) 1976-06-29
JPS5714931B2 (no) 1982-03-27
SE389278B (sv) 1976-11-01
AU472880B2 (en) 1976-06-10
DE2301690A1 (de) 1973-08-09
FR2223088B1 (no) 1978-03-03
JPS4878002A (no) 1973-10-19
SU604466A3 (ru) 1978-04-25
DE2301690C2 (de) 1982-07-29
FR2223088A1 (no) 1974-10-25
AU5130073A (en) 1974-07-25

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