US2711823A - Flotation machines - Google Patents

Flotation machines Download PDF

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Publication number
US2711823A
US2711823A US239878A US23987851A US2711823A US 2711823 A US2711823 A US 2711823A US 239878 A US239878 A US 239878A US 23987851 A US23987851 A US 23987851A US 2711823 A US2711823 A US 2711823A
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US
United States
Prior art keywords
cell
pulp
impeller
disc
blades
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
Application number
US239878A
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English (en)
Inventor
Kihlstedt Per Gudmar
Lofgren Tore Rudolf
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.)
Bolidens Gruvaktiebolag
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Bolidens Gruvaktiebolag
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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
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1456—Feed mechanisms for the slurry
    • 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

Definitions

  • This invention relates to a flotation machine for the flotation of ore bearing pulp, and particularly a machine of the subaeration type having a mechanical air distributor or agitator for froth flotation.
  • froth flotation air For carrying out froth flotation air is introduced into a cell containing an aqueous suspension of finely divided particles of the ore. The air then rises through the suspension in form of bubbles and forms a froth blanket on the surface of the liquid.
  • the cell is usually provided with an impeller for aerating and agitating the liquid, for which purpose the impeller has a plurality of blades.
  • the present invention has now for its object a flotation machine by which said disadvantages are avoided, the pulp being controllably guided outwardly against stationary guide blades or bafiles, and which machine presents also further improvements which will be understood by the following detailed description of a preferred embodiment of the novel machine.
  • Figure 1 is a diagrammatic vertical section of a machine according to a preferred embodiment of the invention.
  • Figure 2 is a horizontal section of the machine shown in Figure 1 taken on line A-A;
  • FIG 3 is a detailed fragmentary vertical view of the impeller included in the machine of Figures 1 and 2;
  • Figure 4 is a horizontal section of the impeller of Figure 3, taken on line C-C of said figure.
  • FIG. 1 is a trough or cell which is shown made of metal sheet but which also may be made of wood or any other suitable material.
  • the top portion of the cell has a rectangular horizontal transverse section to enable it to be directly connected to an adjacent cell. Below the line B--B of Figure l the horizontal section is substantially circular instead of rectangular.
  • Said intermediate portion of the cell has the shape of a frustum of a cone with a slightly inclined wall. The lowest portion of the cell below the impeller also forms a frustum of a cone but the wall of this cone is much more inclined than the abovementioned cone as shown by Figure l.
  • the cell 1 has an opening 2 at one side for introducing pulp to be treated into the cell.
  • the opening may be rectangular as shown or it may have any other States Patent 2,711,823 Patented June 28, 1955 suitable form. It is located on a level just below the lower surface of the froth blanket formed when operating the machine. At the bottom or near the bottom the cell 1 has another opening 3 for withdrawing the tailing. Also this opening may be rectangular or have any other form. 4 is a suitable rotating means for skimming off the concentrates.
  • an air agitating means is provided, the impeller or rotor of which is generally designated by 5 in Figure l.
  • 6 designates generally stationary guide blades or baffles mounted on the pipe 8 which surrounds the impeller spindle (not shown in Figure I).
  • Said spindle and the impeller are driven from a suitable source such as an electric motor (not shown) over the pulley 9 shown at the upper end of the spindle.
  • 7 is an opening in the pipe 8 for admitting air to the impeller.
  • FIG. 11 which show the impeller more in detail 11 is a hub mounted on the spindle 12 to rotate therewith.
  • a disc 13 Integral with the hub 11 or secured thereto is a disc 13, on the upper side of which is radially mounted a number of blades 14.
  • the disc 13 has a peripheral recess 1'5 between each blade, each recess being deepest adjacent to the trailing side of each blade. The direction of rotation is shown by the arrow in Figure 4.
  • the purpose of said recesses is to facilitate the passage of the pulp into the impeller.
  • To the underside of the disc 13 of the impeller there is secured a number of radial blades 20 of a low height.
  • a plate 17 is secured in a suitable way to cover the impeller.
  • annular member 18 is mounted which is provided with a number of guide blades or bafiles 19, the direction of each blade 19 constituting a small angle a with the radius.
  • the air-pulp mixture will be thrown outwardly from the impeller and forced to pass between the stationary guide blades or batfies 19. Said blades will further divide the air bubbles formed. Due to the fact that the guide blades 19 make an angle a with the' radius against the direction of rotation of the impeller ( Figure 4) the rotation of pulp, caused by the impeller, will be substantially compensated and the pulp will leave the guide blades 19 in radial directions substantially. This will give a uniform air distribution throughout the whole area of the cell which improves the flotation process extraordinarily.
  • pulp in the bottom Zone of such machines will usually be relatively rich in the mineral particles which are to be flotated and there is a risk of. the pulp thrown outwardly from the impeller flowing directly through the outlet of the machine. In the machine of theinvention, however, the pulp leaving the machine will. contain a minimum of the particles to be fiotated.
  • the distance between the under surface of the impeller 5 and the bottom of the cell 1 should be within the range of /2 to /s of the diameter of the impeller. This involves a greater distance than is usual, but it will enable the pulp in said zone to be freed from any air bubbles before leaving the cell through the outlet 3. bottom of the cell.
  • Flotation machine comprising a cell for containing the pulp being treated, means for aerating said pulp, said aerating means comprising a rotatable impeller having a disc and radially directed blades thereon, each blade having substantially a uniform height along the radius of the disc, the periphery of the said impeller disc being formed with recesses between the blades to permit pulp to be drawn upwardly from.
  • aerating means being located in the lower section of said cell to form a rising 5 column of air bubbles in the cell to form a froth blanket in the upper section of said cell, the lower section of said cell below the level of the under surface of said means for aerating the pulp having the form of a frustum of a cone, means for forcing air into the space between the rotatable impeller and said stationary disc, thereby supplying air to said aerating means, means for introducing pulp to be treated into the cell and located on a level just below the lower surface of said froth blanket, means for Withdrawing concentrates from the cell and means for withdrawingtailings from the cell.
  • Flotation machine comprising a cell for containing pulp being treated, means for aerating said pulp, said aerating means comprising a rotatable impeller having a disc and radially directed blades thereon, each blade having substantially a uniform height along the radius of the disc, the periphery of the said impeller disc being formed with recesses between the blades to permit pulp to be drawn upwardly from the section of the cell below said impeller disc, an upper stationary disc positioned imme- It will also reduce the wear of the diately' above said blades, saidaerating means being located in the lower section of said cell to form a rising column of air bubbles in the cell to form a froth blanket in the upper section of said cell, means for forcing air into the space between the rotatable impeller and said stationary disc, thereby supplying air to said aerating means, means for introducing pulp to be treated into the cell and located on alevel just below the lower surface of said froth blanket, means for Withdrawing concentrates from the cell, and
  • Flotation machine comprising a cell for containing the pulp being treated, means for aerating said pulp, said aerating means comprising a rotatable impeller having a disc and radially directed blades thereon, each blade having substantially a uniform height along the radius of the disc, the periphery of the said impeller disc being formed with recesses between the blades to permit pulp to be drawn upwardly from the section of the cell below said impeller disc, an upper stationary disc positioned immediately above said blades, said aerating means being located in the lower section of said cell to form a rising column of air bubbles in the cell to form a froth blanketv in the upper section of said cell, said aerating means also including a substantially circular set of deflector baffies positioned about butspaced from the periphery of said blades, the alignment of each baflie forming an angle from the radius of said disc to substantially eliminate the swirling movement of pulp leaving the impeller, means for forcing air into the space between said rotatable impeller
  • Flotation machine comprising a cell for containing the pulp being treated, means for aerating said pulp, said aerating means comprising a rotatable impeller having a disc and radially directed blades thereon, each blade having substantially a uniform, height along the radius of the disc, theperiphery of the said impeller disc being formed with recesses between the blades to permit pulp to be drawn upwardly from. the sectionv of the cell below said impeller disc, each. of said recesses in said disc between said blades has its greatest depth adjacent the trailing edge of each blade, an upper stationary disc positioned immediately above said blades, said aerating means.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US239878A 1950-08-02 1951-08-02 Flotation machines Expired - Lifetime US2711823A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE76446X 1950-08-02

Publications (1)

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US2711823A true US2711823A (en) 1955-06-28

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Application Number Title Priority Date Filing Date
US239878A Expired - Lifetime US2711823A (en) 1950-08-02 1951-08-02 Flotation machines

Country Status (5)

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US (1) US2711823A (da)
DE (2) DE855531C (da)
DK (2) DK77681C (da)
FR (2) FR1047941A (da)
GB (2) GB703571A (da)

Cited By (5)

* 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
US3256987A (en) * 1962-04-27 1966-06-21 Kloeckner Humboldt Deutz Ag Flotation apparatus
EP0140310A2 (de) * 1983-10-20 1985-05-08 YSTRAL GmbH Verfahren und Vorrichtung zum Trennen der Bestandteile von emulsionshaltigen Abwässern mittels Rührwerksflotation
US4551285A (en) * 1984-02-09 1985-11-05 Envirotech Corporation Flotation machine and aeration impeller
US5509535A (en) * 1994-07-12 1996-04-23 Hydrochem Developments Ltd. Flotation apparatus

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1417895A (en) * 1920-05-11 1922-05-30 Arthur W Fahrenwald Flotation apparatus
US1445042A (en) * 1917-08-16 1923-02-13 Jr Joseph P Ruth Flotation apparatus
US2031590A (en) * 1931-10-05 1936-02-25 Arthur C Daman Flotation apparatus
GB445547A (en) * 1934-10-06 1936-04-06 Robert Sydney Detlor Improvements in combustion devices for furnaces
US2134410A (en) * 1936-09-28 1938-10-25 Kraut Max Flotation apparatus
US2243309A (en) * 1938-11-25 1941-05-27 Mining Process & Patent Co Flotation apparatus
US2274401A (en) * 1940-08-05 1942-02-24 Frank A Dromgold Agitating and aerating means for flotation cells
US2436375A (en) * 1943-04-19 1948-02-24 American Cyanamid Co Clarifier for lubricating coolants by means of frothe flotation
US2609097A (en) * 1949-05-12 1952-09-02 Combined Metals Reduction Comp Flotation machine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1445042A (en) * 1917-08-16 1923-02-13 Jr Joseph P Ruth Flotation apparatus
US1417895A (en) * 1920-05-11 1922-05-30 Arthur W Fahrenwald Flotation apparatus
US2031590A (en) * 1931-10-05 1936-02-25 Arthur C Daman Flotation apparatus
GB445547A (en) * 1934-10-06 1936-04-06 Robert Sydney Detlor Improvements in combustion devices for furnaces
US2134410A (en) * 1936-09-28 1938-10-25 Kraut Max Flotation apparatus
US2243309A (en) * 1938-11-25 1941-05-27 Mining Process & Patent Co Flotation apparatus
US2274401A (en) * 1940-08-05 1942-02-24 Frank A Dromgold Agitating and aerating means for flotation cells
US2436375A (en) * 1943-04-19 1948-02-24 American Cyanamid Co Clarifier for lubricating coolants by means of frothe flotation
US2609097A (en) * 1949-05-12 1952-09-02 Combined Metals Reduction Comp Flotation machine

Cited By (6)

* 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
US3256987A (en) * 1962-04-27 1966-06-21 Kloeckner Humboldt Deutz Ag Flotation apparatus
EP0140310A2 (de) * 1983-10-20 1985-05-08 YSTRAL GmbH Verfahren und Vorrichtung zum Trennen der Bestandteile von emulsionshaltigen Abwässern mittels Rührwerksflotation
EP0140310A3 (en) * 1983-10-20 1987-02-04 Ystral Gmbh Method and device for separating emulsions and/or solids from a suspension of solids and a liquid by means of mechanical flotation
US4551285A (en) * 1984-02-09 1985-11-05 Envirotech Corporation Flotation machine and aeration impeller
US5509535A (en) * 1994-07-12 1996-04-23 Hydrochem Developments Ltd. Flotation apparatus

Also Published As

Publication number Publication date
DE855531C (de) 1952-12-08
FR1047941A (fr) 1953-12-17
GB703571A (en) 1954-02-03
DE854034C (de) 1952-10-30
DK76446C (da) 1953-10-05
FR1047940A (fr) 1953-12-17
GB699045A (en) 1953-10-28
DK77681C (da) 1954-06-21

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