EP0098902A2 - Kaskaden-Flotationsverfahren und Vorrichtung zur Durchführung des Verfahrens - Google Patents

Kaskaden-Flotationsverfahren und Vorrichtung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0098902A2
EP0098902A2 EP82303547A EP82303547A EP0098902A2 EP 0098902 A2 EP0098902 A2 EP 0098902A2 EP 82303547 A EP82303547 A EP 82303547A EP 82303547 A EP82303547 A EP 82303547A EP 0098902 A2 EP0098902 A2 EP 0098902A2
Authority
EP
European Patent Office
Prior art keywords
mixture
container
air
froth
outlet
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.)
Withdrawn
Application number
EP82303547A
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English (en)
French (fr)
Other versions
EP0098902A3 (de
Inventor
Hjalmar Andreas Kaare Hitland
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP82303547A priority Critical patent/EP0098902A3/de
Publication of EP0098902A2 publication Critical patent/EP0098902A2/de
Publication of EP0098902A3 publication Critical patent/EP0098902A3/de
Withdrawn legal-status Critical Current

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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
    • B03D1/02—Froth-flotation processes
    • B03D1/028—Control and monitoring of flotation processes; computer models therefor
    • 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
    • B03D1/1456—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
    • B03D1/1493—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
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type

Definitions

  • the flotation principle as applied to the recovery of minerals or metals from ore has been known for the last century, an example of a known froth flotation apparatus being shown in Canadian Patent Specification No. 167,476 issued on February 8th 1916 to Minerals Separation American Syndicate (1913) Limited.
  • This specification relates to the concentration of sulphide ores by froth flotation separation in which the ores are subjected to aeration in an aqueous separating medium in the presence of a frothing agent.
  • the aeration is obtained by passing crushed ore, froth and water through a series of pipes between vertically spaced containers, each pipe having an intermediate open topped container so that air can be entrapped in the mixture by exposure at the open top of the container.
  • the mixture with air therein then passes into the next container through a submerged outlet.
  • This system does provide a certain amount of aeration to the mixture, however it has since been determined that if more air can be entrapped in the mixture then more frothing will occur and a more efficient separation of the mixture will be possible.
  • a process of separating minerals or metals from a crushed ore mixture of crushed ore, aqueous solution, and a flotation agent comprises causing the mixture to fall freely into a container while entrapping air during the fall and thereby encouraging the development of froth at the top of the mixture in the container, and separating the froth and lighter component from the rest of the mixture in the container.
  • the mixture may be caused to enter and to fall freely our of a header which is provided with an air inlet whereby the mixture entrains air as it passes through the header.
  • the mixture will then draw in air by the venturi principle and cascade through air into the container, so entrapping additional air during the cascading.
  • the mixture may be held at a substantially constant level in the container by regulating flow from the bottom of the container, e.g. by a level sensing device which operates a valve near the base of the container.
  • the frothing may be promoted further if the mixture falls onto a baffle situated adjacent to the surface of the mixture in the container.
  • the invention also includes apparatus for carrying out the process, the apparatus comprising a container, a mixture outlet situated above the container so that, in use, an air space exists between the mixture outlet and the surface of the mixture in the container, means for collecting froth from the top of the mixture in the container, and means for maintaining a substantially constant level of mixture in the container.
  • the apparatus further comprises a header distribution box having an inlet for the mixture and a number of mixture outlet ducts, each of the outlet ducts being associated with an air inlet pipe whereby mixture passing through the distribution box from the inlet to the outlet ducts will entrain air drawn in through the air inlet pipes.
  • the means for collecting the froth may comprise a collecting launder to which:. e.g. the froth may be moved across the top of the mixture.
  • a container 1 has a froth retainer 3 and a froth collecting launder 5.
  • Inlet pipe 7 is coupled to a distribution header box 9 which has three vertically oriented outlet pipes 11 extending from the bottom thereof. Three pipes 11 are shown in this embodiment, however the apparatus will function with a lesser or greater number of outlet pipes, less pipes producing slightly less aeration and more pipes producing slightly more aeration of the mixture.
  • Outlet pipes 11 are each fitted with an air intake venturi pipe 39 extending from above the header box 9 down into the pipe.
  • a perforate baffle 23 is situated inside the container below the shield 13 and is secured to the side of the container by a suitable bracket 25.
  • the baffle 23 is shown as being flat and in a horizontally disposed position below the surface of the mixture, however it could be on the surface of the mixture, curved, or of any other form or inclined to the horizontal, the position, form and attitude of the baffle being selected, and preferably variable, possibly even during operation, to suit the mixture being processed, so as to achieve maximum dispersion of froth and flotation of fine and coarse materials.
  • a mixture level controlling valve 27 is situated near the base of the container and in the simple form shown consists of a U-shaped hollow body 29 having a stopper 31 which fits in a sealing manner in the top aperture of the body 29.
  • the stopper 31 is secured to a rod 33 which is reciprocally moved by an actuator 35 which is operated through a sensor (not shown) which senses the level 21 of the mixture in the container.
  • An outlet pipe 37 leads off the froth from the collecting launder 5.
  • crushed ore is mixed with water and flotation agents which are selected to suit the ore being treated.
  • flotation agents are well known in the industry and form no part of this invention.
  • the mixture is then passed through pipe 7 into distribution header box 9, wherein it is aerated by venturi pipes 39, and out through pipes 11.
  • the mixture falls freely through the air into the container 1 through the shield 13 which merely reduces the amount of splashing caused when the aerated mixture hits the surface 21 of the mixture in the container. More aeration is achieved by the free fall of the mixture and by the splashing caused at the surface 21.
  • baffle 23 which tends to cause the froth being formed to move towards the collecting launder 5 from which it is retrieved from outlet 37 for further processing.
  • the level of the surface 21 of the mixture in the container is held constant by controlling valve 27, the mixture being dumped through valve 27 either being reprocessed through additional flotation apparatus, passed on to further mill processes or discarded,
  • Multiple cascading can also be arranged by positioning single units one above the other.
  • An embodiment having two stacked units is shown in Figures 3, 4, and 5 and the same reference numerals are used for like parts to those in Figures 1 and 2.
  • the level of mixture in a unit is held constant in this embodiment by permitting the mixture left, after froth collection from launder 5, to pass through pipe 41 and flow into a trough 43 so passing through outlet pipes 11 to the next unit.
  • the level of mixture can be controlled at a desired height by use of interfitting collars 45 which are well known for mixture height control in this field.
  • the baffle 23 is also shown in a horizontal attitude in this embodiment but it is preferable that the baffle be adjustable in height and/or inclination, preferably during operation, to suit the type of mixture being processed. If additional banks of units are required the residual mixture can be returned to a convenient height by pumping.
  • Single units can also be usefully employed at the discharge end of a mill to reclaim minerals which would be otherwise lost in the mill tailings flow.
  • a single unit in such a location can recover up to 50 to 75% of the mineral presently being lost without additional expenditure of power or energy with or without additional frothing agents.
  • Some milling processes lose as much or more than 2000 lbs. of mineral in a 24 hour period and therefore recovery of 50% of this amount can produce, with negligible cost, an additional recovery of 1000 lbs. of mineral in a 24 hour period which would otherwise be lost.
  • the ability of the unit to float much coarser materials and heavier minerals also leads to increased recoveries of heavier precious metals such as gold and silver and faster recoveries of base metals still in a coarse state.
  • precious metals such as gold and silver
  • base metals still in a coarse state.
  • iron is always present as an unwanted mineral in copper and/or zinc recovery and can be removed more easily with the unit of this invention.
  • the iron and sulphide containing materials can, after removal, be then used as backfill in mining operations instead of being disposed of in tailings disposal areas where they create environment problems.
  • the ability of the unit to separate coarse material also reduces the necessity for excessively fine grinding of ores to attain maximum mineral recovery.
  • the cascade unit therefore produced 51.64% of coarse minerals whereas the standard Denver and Wemco units is multiple banks produced only 26.73% of coarse minerals.
  • the cascade unit was then placed in a primary copper recovery circuit in the same mill and in a two hour forty minutes test period produced the following results:
  • the cascade unit was placed on stream and in a test period of three and one half days produced a high grade concentrate at least equivalent to a unit tank cell which was 27 times larger in volume than the cascade unit.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP82303547A 1982-07-06 1982-07-06 Kaskaden-Flotationsverfahren und Vorrichtung zur Durchführung des Verfahrens Withdrawn EP0098902A3 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP82303547A EP0098902A3 (de) 1982-07-06 1982-07-06 Kaskaden-Flotationsverfahren und Vorrichtung zur Durchführung des Verfahrens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82303547A EP0098902A3 (de) 1982-07-06 1982-07-06 Kaskaden-Flotationsverfahren und Vorrichtung zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP0098902A2 true EP0098902A2 (de) 1984-01-25
EP0098902A3 EP0098902A3 (de) 1984-12-05

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Family Applications (1)

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EP82303547A Withdrawn EP0098902A3 (de) 1982-07-06 1982-07-06 Kaskaden-Flotationsverfahren und Vorrichtung zur Durchführung des Verfahrens

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109382215A (zh) * 2018-09-29 2019-02-26 四川西冶检测科技有限公司 自动添加石灰乳系统

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB104367A (en) * 1916-02-26 1917-02-26 Minerals Separation Ltd Improvements in or relating to Apparatus for the Concentration of Ores.
US1380650A (en) * 1917-11-20 1921-06-07 Minerals Separation North Us Apparatus for the concentration of ores
US1442306A (en) * 1923-01-16 Oil-elotation apparatus
US1780022A (en) * 1928-07-03 1930-10-28 Minerals Separation North Us Flotation concentration of phosphatic material
US1869732A (en) * 1930-11-10 1932-08-02 Dale L Pitt Apparatus for the concentration of ores
US2416066A (en) * 1944-05-19 1947-02-18 Donald S Phelps Froth flotation cell
US3255882A (en) * 1962-10-15 1966-06-14 Duval Sulphur & Potash Company Flotation froth level control
EP0041728A1 (de) * 1980-06-11 1981-12-16 J.M. Voith GmbH Flotationszelle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1442306A (en) * 1923-01-16 Oil-elotation apparatus
GB104367A (en) * 1916-02-26 1917-02-26 Minerals Separation Ltd Improvements in or relating to Apparatus for the Concentration of Ores.
US1380650A (en) * 1917-11-20 1921-06-07 Minerals Separation North Us Apparatus for the concentration of ores
US1780022A (en) * 1928-07-03 1930-10-28 Minerals Separation North Us Flotation concentration of phosphatic material
US1869732A (en) * 1930-11-10 1932-08-02 Dale L Pitt Apparatus for the concentration of ores
US2416066A (en) * 1944-05-19 1947-02-18 Donald S Phelps Froth flotation cell
US3255882A (en) * 1962-10-15 1966-06-14 Duval Sulphur & Potash Company Flotation froth level control
EP0041728A1 (de) * 1980-06-11 1981-12-16 J.M. Voith GmbH Flotationszelle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109382215A (zh) * 2018-09-29 2019-02-26 四川西冶检测科技有限公司 自动添加石灰乳系统

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Publication number Publication date
EP0098902A3 (de) 1984-12-05

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