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WO1999032229A1 - Dispositif et procede pour ameliorer la flottation au moyen de champs magnetiques - Google Patents

Dispositif et procede pour ameliorer la flottation au moyen de champs magnetiques Download PDF

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Publication number
WO1999032229A1
WO1999032229A1 PCT/AU1998/001044 AU9801044W WO9932229A1 WO 1999032229 A1 WO1999032229 A1 WO 1999032229A1 AU 9801044 W AU9801044 W AU 9801044W WO 9932229 A1 WO9932229 A1 WO 9932229A1
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WO
WIPO (PCT)
Prior art keywords
mineral
flotation
slurry
magnetic means
magnetic
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.)
Ceased
Application number
PCT/AU1998/001044
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English (en)
Inventor
Barry Graham Lumsden
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Individual
Original Assignee
Individual
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Filing date
Publication date
Priority claimed from AUPP1066A external-priority patent/AUPP106697A0/en
Priority claimed from AUPP1464A external-priority patent/AUPP146498A0/en
Application filed by Individual filed Critical Individual
Priority to AU16508/99A priority Critical patent/AU1650899A/en
Publication of WO1999032229A1 publication Critical patent/WO1999032229A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/0332—Component parts; Auxiliary operations characterised by the magnetic circuit using permanent magnets
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/0335—Component parts; Auxiliary operations characterised by the magnetic circuit using coils
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B03C1/12—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with magnets moving during operation; with movable pole pieces
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/18—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
    • B03C1/20—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation in the form of belts, e.g. cross-belt type
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/28—Magnetic plugs and dipsticks
    • B03C1/284—Magnetic plugs and dipsticks with associated cleaning means, e.g. retractable non-magnetic sleeve
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/28—Magnetic plugs and dipsticks
    • B03C1/286—Magnetic plugs and dipsticks disposed at the inner circumference of a recipient, e.g. magnetic drain bolt
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/28—Magnetic plugs and dipsticks
    • B03C1/288—Magnetic plugs and dipsticks disposed at the outer circumference of a recipient
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/18—Magnetic separation whereby the particles are suspended in a liquid

Definitions

  • This invention relates to a device and method for the recovery of at least one mineral from an ore body. More specifically, the device and method can be used for improving the recovery of a mineral product in a froth flotation process. Alternatively, the device and method can be used for reducing the amount of unwanted mineral in the concentrate stream of a flotation cell by ensuring that a greater portion of the unwanted mineral reports to a tailing stream.
  • mineral refers to one or more metal or non-metal compounds that may be subjected to a froth flotation process including ores, concentrates, semi-refined metal compounds, metal oxides and sulfides, flue dust etc.
  • the flotation process is used to recover minerals from a mineral ore by ensuring that the mineral is hydrophobic so that it may float in an aerated flotation cell.
  • the ore is mined prior to undergoing a comminution process whereby it is first crushed and then ground in a mill, usually in the presence of water, to a fine size so as to form a slurry.
  • the pH may be adjusted and chemicals added as required during the milling or subsequent operations.
  • the slurry then usually undergoes cycloning so that the solids in the slurry are of the required size for flotation.
  • the fine particle slurry is generally fed to a flotation chamber where further chemicals, such as for example pine oil or MIBC, may be added to act as a frothing agent which produces a stable froth.
  • Substitute Sheet Other chemicals may also be added prior to the flotation process to act as collecting agents, depressants or promoters.
  • Examples families of chemical collectors include Xanthates and Dithiophosphates which react with the mineral to make its surface hydrophobic so that it may attach to the surface of bubbles as they travel through the flotation cell to a froth phase. The efficiency at which the collector attaches to the mineral will be one factor which affects the performance of a flotation operation.
  • Other reagents may be added to the flotation process to adjust surface potential and particle surface interactions, such as for example sodium hydrogen sulfide (NaSH) .
  • NaSH sodium hydrogen sulfide
  • the selection of the particular frothing or collecting agent will depend upon the mineral undergoing flotation and the desirable surface potential and flotation conditions.
  • frother and other agents are added to the slurry, the mixture is then subjected to aeration within an agitated chamber known as a flotation cell. Air or other gases are introduced to the flotation cell to create a froth on the surface of the mixture. Hydrophobic minerals attach to the bubbles of the mixture transferring to a froth phase on the surface of the process fluid. Non- hydrophobic gangue is discharged and does not enter the froth phase but reports to a tailings stream at the bottom end of the flotation cell.
  • Flotation is used for many mineral recovery processes such as for the recovery of copper, molybdenum, nickel, lead and zinc. Furthermore, flotation may be used in a number of other separation processes, such as for cleaning coal .
  • the present invention provided an improvement in the performance of a flotation process.
  • By improving the recovery or quality of product from a mineral flotation process significant increases in productivity from mineral processing plants are possible which would produce an increase in revenue.
  • an apparatus for flotation of at least one mineral included in a slurry including:
  • the magnetic means may be located within the flotation treatment enclosure or outside of the flotation treatment enclosure.
  • the magnetic means may be in the form of a movable magnetic structure.
  • the magnetic means may be in the form of a fixed magnetic structure.
  • these structures are capable of orientation, either simultaneously or separately, to encourage movement of mineral particles in a particular direction due to the application of a magnetic field.
  • the movable magnetic structure may be in the form of a motive structure within a sealed protective housing which is placed in contact with the mineral slurry and/or froth interface.
  • this apparatus will have a mechanism for the movement of magnetic means within the housing to allow discharge of fine mineral accumulated on the surface of the housing.
  • the movable magnetic structure may be in the form of a motive structure in direct contact with the mineral slurry and the froth interface.
  • this apparatus will have a mechanism capable of scraping and discharging the fine mineral accumulated from the surface of the magnetic means .
  • the magnetic field is applied by means of a magnet. More preferably the magnet is either an electromagnet or a permanent magnet.
  • the flotation treatment enclosure will consist of a tank fitted with a mechanism to provide gas phase dispersion in the form of bubbles.
  • a method for flotation of at least one mineral included in a slurry including the steps of:
  • the mineral has undergone a mineral comminution operation so that when it enters the flotation treatment enclosure it is in fine particle form.
  • reagents or other additives have been included in the milling.
  • the mineral particles undergo a mineral comminution operation so that the size distribution of the mineral particles is 80% smaller than 200 micrometers in size.
  • the mineral may be capable of being ferromagnetic or paramagnetic so that when the magnetic field is applied to the flotation enclosure, the mineral particles move towards a froth phase. More advantageously upon application of the magnetic field the finer sized mineral particles attract to other particles, so forming larger particles which report to a froth phase.
  • the mineral may be capable of being ferromagnetic or paramagnetic so that when the magnetic field is applied to the flotation enclosure, the mineral moves away from a froth phase. More advantageously upon application of the magnetic field a substantial portion of the mineral reports to a tailing stream.
  • the flotation treatment enclosure is a flotation cell, column or chamber which is used for a flotation process.
  • the gas phase in the flotation treatment enclosure is substantially evenly dispersed throughout the slurry of the flotation treatment enclosure. More typically, gas phase is in the form of bubbles which are dispersed throughout the slurry and aerate the slurry to produce bubbles. Typically the gas phase is air supplied to the flotation treatment enclosure.
  • chemicals are added to the flotation treatment enclosure so that with the bubbles and magnetic field, the mineral particles tend to travel towards a froth phase which forms on top of the slurry. More preferably these chemicals would include collectors, frothers, surface potential modifiers and the like. More preferably other particulate additives could be included such as iron powder .
  • Figure 1 is a diagrammatic horizontal section through a flotation cell with two sets of magnets, one set of magnets being placed inside the flotation cell while the other set of magnets are placed outside the flotation cell;
  • Figure 2 is a diagrammatic elevation showing an embodiment of the present invention in which there are a series of magnets which move within an enclosure that is inside a flotation cell;
  • Figure 3 is a diagrammatic elevation showing an embodiment of the present invention in which there are a series of magnets which move within an enclosure that is inside a flotation cell so that the mineral particles are attracted away from a froth phase;
  • Figure 4 is a diagrammatic elevation showing a series of magnets that are inside a tubular enclosure, the tubular enclosure being placed inside and towards the top of a flotation cell;
  • Figure 5 is a diagrammatic elevation showing a magnet inside a flotation cell in which the gradient of the magnetic field induced by the magnet is greater towards the top of the flotation cell;
  • Figure 6 is a diagrammatic elevation showing a plurality of magnets which are deployed at the interface of the li-quid and froth phase so as to ensure the magnetic field is applied across upper surface of the flotation cell;
  • Figure 7 is a diagrammatic sectional plan view showing a cross-section of a self-cleaning magnetic tube;
  • Figure 8 is a similar view to Figure 7 showing the tube being cleaned on one side so that the particles move from the surface of the tube; and Figure 9 is a similar view to Figure 7 showing the alternative side being cleaned and the particles being removed from the tube .
  • Figure 10 is a diagrammatic elevation showing an embodiment of the present invention using a rotating drum magnet to directly draw magnetisable material from the froth.
  • this diagram shows examples of two possible arrangements in which a magnetic field may be imparted to a flotation treatment enclosure.
  • a flotation treatment enclosure in the form of flotation cell 10 in which one set of magnetic means in the form of permanent magnets 14 are placed throughout the flotation cell 10 in parallel, equally spaced rows.
  • the minerals shown in the form of the mineral particles 12 are, in this example of the invention, ferromagnetic or paramagnetic.
  • the permanent magnets 14 or electromagnets 16 impart a magnetic field to the flotation slurry within flotation cell 10
  • the mineral particles become magnetized particles 13 and coagulate as they are attracted to each other.
  • the surfaces of the mineral particles are reacted with a collector chemical for example with a functional group such as Xanthate.
  • the magnetized particles 13 are subjected to a flotation process wherein they attach to bubbles 15 and move towards the froth phase 18.
  • the permanent magnets 14 and the electromagnets 16 could be used upon a flotation cell 10 either together, as in this example, or individually so as to achieve the desired effect.
  • the electromagnets 16 may be placed within the flotation cell 10 and the permanent magnets 14 may be placed outside of the flotation cell 10. Such examples and variations are encompassed by the invention.
  • this diagram demonstrates another example of the means by which a magnetic means can be imparted to a flotation treatment enclosure.
  • a flotation treatment enclosure in the form of a flotation cell 10 within which there is a protective housing 20.
  • the protective housing 20 is placed inside the flotation cell 10.
  • the protective housing 20 is enclosed so that slurry cannot enter.
  • the belts 22 enable the magnets 14 to travel around the protective housing 20 as they are moved by two rollers 24.
  • the rollers 24 are, in this example, directly aligned underneath each other so that the belts 22 can travel substantially throughout the height of the flotation cell 10.
  • a magnetic field is imparted throughout the height of the flotation cell 10 and in a direction which moves towards the froth phase 18.
  • the small mineral particles 12 under a magnetic field are attracted to each other forming magnetized particles 13 which move as the belts 22 move towards the surface of the froth phase 18.
  • the general flow path of the magnetized particles is represented by flow lines 19.
  • the two belts which are placed inside the protective housing 20 are placed at equally spaced distances on the belt so that movement of the magnetized particles is towards the froth phase 18.
  • this example is a similar device to that shown in Figure 2, however there is a single belt 22 which rotates about two rollers 24 on the outside of the flotation cell 10. Hence, it will be apparent to those persons skilled in the art that such a belt could be placed on any side of the flotation cell so that a magnetic field is imparted to the slurry. In this example the magnetized particles are travelling towards the tailings stream 21.
  • this diagram shows a flotation treatment enclosure in the form of a flotation cell 10 in which there is a magnetic means in the form of permanent magnets 14 that rotate within a protective housing 20.
  • the protective housing includes a cylindrical tube 26 and rotating wheel 28.
  • the rotating wheel 28 rotates within the cylindrical tube in a clockwise direction.
  • the rotating wheel 28 has attached on its outer surface a plurality of stems 30.
  • the magnets 14 On the periphery of the stems 30 are the magnets 14 which rotate about the inner surface of the cylindrical tube 26 during the flotation process .
  • a magnetic bridge 32 On one side of the cylindrical tube 26, there is a magnetic bridge 32 which ensures that the magnetic field is shunted from the flotation cell 10 as the magnets 14 rotate past the magnetic bridge 32. This ensures that the mineral particles 12 are maintained in the froth phase and not carried over back into the slurry phase as the rotating wheel 28 moves in a clockwise direction within the flotation cell 10.
  • the general path of the magnetized particles can be shown by flow lines 21.
  • a magnetic means in the form of a magnet 14 which is located within a flotation treatment enclosure in the form of a flotation cell 10.
  • the gradient of the magnetic field or the rate of change of magnetic field strength over the length of the flotation cell is greater towards the surface of the mixture as shown by magnetic field lines 23. This encourages the mineral particles 12 to move towards the froth phase 18.
  • the general path of the magnetized particles can be shown by flow lines 19.
  • this example of the present invention shows the magnetic means in the form of a plurality of circular-shaped magnets 14 configured in a grid-like pattern on the surface of the slurry, so as to establish a magnetic field in the region of the slurry- froth interface.
  • the slurry is contained by the flotation treatment enclosure in the form of flotation cell 10. Any sort of grid arrangement can be used, but in this arrangement the grids are arranged in a series of squares so that there is an interface of magnets with overlapping field areas 15.
  • the mineral particles 12 which are either ferromagnetic, paramagnetic or diamagnetic particles, are circulated throughout the chamber by an agitator and/or by the gas phase in the form of bubbles 34 supplied to the flotation cell 10.
  • the magnets 14 can be placed in either the slurry itself or partially in the froth phase above the slurry, without departing from the features of the present invention as disclosed herein. - li lt will be apparent to those skilled in the art that, some of the mineral particles that become magnetized, may attach permanently to any of the surfaces of the above- mentioned magnetic means, rather than proceeding to the froth. Over time, the build up of particles reduces the efficiency of the magnetic device in imposing a magnetic field to the flotation treatment enclosure, hence there is provided a device to overcome the problems associated with the build up of magnetic particles. For example in Figure 6 there is shown a cross-section of a number of magnets which are in a grid arrangement on the surface of the mixture. In this example, it can be shown that the magnets 14 collect fine, strongly magnetic particles that may be present in or have been introduced to the grinding process .
  • this diagram shows a self- cleaning tube magnet 36 which can be used in the place of the magnets 14 and which includes a plurality of magnet elements 40 enclosed within a tubular section 38.
  • the magnetic elements may be any type of magnet but in this example, they are permanent magnets.
  • the magnetic elements are spaced within the tubular section 38 at even intervals so that between each magnet element 40 there is a compartment 42.
  • plugs 44 which insert into the ends of the tubular section 38.
  • a conduit 46 which is attached to an air supply tube 48.
  • a discharge disc 50 is positioned in the middle section of the tubular section and is made from any type of diamagnetic material .
  • the tubular section 38 imparts a magnetic field 15 substantially along the length of the tubular section 38 so as to impart a magnetic field to the slurry solution.
  • fine particles 52 may accumulate on the outer surface of the tubular section, hence when the tubular section 38 is to be cleaned, an air supply is provided at one end via air supply tube 48 which imparts a pressure force of air to the conduit 46. This force acts against the seal 54 which moves the magnet elements to one end of the tubular section 38 as shown in Figure 8.
  • an air supply is provided at one end via air supply tube 49 which imparts a pressure force of air to the conduit 46. This force acts against the seal 54 which moves the magnet elements to one end of the tubular section 38 as shown in Figure 9.
  • the device may be of any particular shape and that the magnetic elements could be easily substituted into a single unit.
  • this diagram shows a cross sectional diagram of a flotation treatment enclosure in the form of a flotation cell 10 in where there is a magnetic means in the form of a permanent magnet 54 that rotates in direct contact with the mineral slurry 56 and the froth layer above the slurry 18 and which has some clearance over the top of the froth layer 62.
  • the general flow paths of the magnetised particles are represented by flow lines 19.
  • the magnetic means 54 is circular in configuration and arranged for rotation about a horizontal axis with the lower part of the magnetic means immersed in the mineral slurry 56 and/or froth layer 18 above.
  • Test 1 are the results of flotation using a standard flotation cell
  • Test 2 are the results of flotation using the present invention.
  • the Cu recovery using the present invention is significantly increased over that of the prior art using conventional flotation techniques. It has been found that improvements in the recovery of Cu using the present invention are in the order of 5-6 % wt .
  • Test 3 are the results of flotation using a standard flotation cell
  • Test 4 are the flotation results using the present invention.
  • Test 3 and Test 4 were carried out in under the same test conditions and using the same feed stock.
  • the Ni recovery using the present invention is significantly increased over that of the prior art using conventional flotation techniques. It has been found that the improvement in the recovery of Ni using the present invention is in the order of 4 % wt .
  • Test 3 are the results of flotation using a standard flotation cell
  • Test 4 are the flotation results using the present invention.
  • Both Test 3 and Test 4 were carried out under the same test conditions and using the same feed stock. Some of the mineral particles that become magnetized may attach permanently to any of the surfaces of the above-mentioned magnetic means, rather than proceeding to the froth. Recovery I is the recovery of mineral during flotation, and Recovery II is the recovery from the magnet itself during flotation. Use was made of a device to overcome the problems associated with the build up of magnetic particles. The magnets collect fine, strongly magnetic particles that may be present in the flotation cell. The fine particles which are on the surface of the tubular section of the magnetic means are removed from the surface of this tubular section at the discharge disc and the self- cleaning tube magnet becomes clean. A size analysis of the copper-containing mineral reporting to concentrate was conducted.
  • the Ni recovery using the present invention is significantly increased over that of the prior art using conventional flotation techniques, across the particle size range.
  • a self-cleaning magnetic device partially located within the flotation cell significantly augments flotation recovery of mineral.
  • improvements in the recovery of Ni using the present invention are in the order of 3-5 % wt .
  • the Cu recovery using the present invention is significantly increased over that of the prior art using conventional flotation techniques, across the particle size range.
  • improvements in the recovery of Cu using the present invention are in the order of 9-10 % wt .
  • Test 7 are the results of flotation using the present invention
  • Test 8 are the flotation results using the present invention with the inclusion of a finely ground magnetic material in the pulp (in this case, iron powder) , introduced previously in the milling stage. Magnetic means were available in both instances.
  • Test 7 and Test 8 were carried out in under the same test conditions and using the same feed stock.
  • the Cu recovery using the present invention is significantly increased over that of the prior art using the same new flotation techniques . It has been found that improvements in the recovery of Cu using the present invention are in the order of 1-2 % wt .
  • Test 9 are the results of flotation using the present invention
  • Test 10 are the flotation results using the present invention with the inclusion of a reductant (reducing agent) in the flotation cell (in this case, sodium hydrogen sulfide) .
  • a reductant reducing agent
  • Magnetic means were available in both instances .
  • Test 9 and Test 10 were carried out in under the same test conditions and using the same feed stock.
  • the Cu recovery using the present invention is significantly increased over that of the prior art using the same new flotation techniques . It has been found that improvements in the recovery of Cu using the present invention are in the order of 1 % wt.
  • the flotation treatment enclosure relates to any device for flotation, such as a flotation cell or flotation column.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un appareil et un procédé pour réaliser la flottation d'au moins un minéral contenu dans une boue. Ledit appareil comprend une enceinte de traitement par flottation se présentant sous la forme d'une cellule de flottation (10) destinée à recevoir la boue contenant le minéral pour la soumettre à un processus de flottation, ainsi que des moyens magnétiques (14, 16) disposés, lors de l'utilisation de l'appareil, de façon à appliquer un champ magnétique aux particules de minéral (12) se trouvant à l'intérieur de la cellule (10).
PCT/AU1998/001044 1997-12-22 1998-12-18 Dispositif et procede pour ameliorer la flottation au moyen de champs magnetiques Ceased WO1999032229A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU16508/99A AU1650899A (en) 1997-12-22 1998-12-18 Device and method for improving flotation process using magnetic fields

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPP1066 1997-12-22
AUPP1066A AUPP106697A0 (en) 1997-12-22 1997-12-22 Assisted flotation
AUPP1464 1998-01-22
AUPP1464A AUPP146498A0 (en) 1998-01-22 1998-01-22 Device and method for improving flotation

Publications (1)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7429331B2 (en) 2001-02-16 2008-09-30 Ausmetec Pty. Ltd. Apparatus and process for inducing magnetism
EP2563520A4 (fr) * 2010-04-29 2017-06-28 Ausmetec Pty Ltd Appareil pour magnétisation continuelle d'une pâte
EP3424600A4 (fr) * 2017-01-11 2019-11-27 Institute of Process Engineering, Chinese Academy of Sciences Système de séparation magnétique continu assisté par gaz pour procédé entier
WO2021089988A1 (fr) * 2019-11-04 2021-05-14 Romar International Limited Appareil et procédé de séparation de particules magnétiques de liquides et de boues

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1256976A (en) * 1975-04-04 1977-10-06 Financial Mining-Industrial And Shipping Corporation Upgrading the nickel content from low grade nickel lateritic iron ores
US4343694A (en) * 1980-08-25 1982-08-10 Anglo-American Clays Corporation Magnetic beneficiation of clays utilizing magnetic seeding and flotation
WO1983001397A1 (fr) * 1981-10-26 1983-04-28 Snook, Harvey Flottation magnetique
JPH0487648A (ja) * 1990-07-27 1992-03-19 Sumitomo Metal Mining Co Ltd モリブデン鉱物の精製方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1256976A (en) * 1975-04-04 1977-10-06 Financial Mining-Industrial And Shipping Corporation Upgrading the nickel content from low grade nickel lateritic iron ores
US4343694A (en) * 1980-08-25 1982-08-10 Anglo-American Clays Corporation Magnetic beneficiation of clays utilizing magnetic seeding and flotation
WO1983001397A1 (fr) * 1981-10-26 1983-04-28 Snook, Harvey Flottation magnetique
JPH0487648A (ja) * 1990-07-27 1992-03-19 Sumitomo Metal Mining Co Ltd モリブデン鉱物の精製方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7429331B2 (en) 2001-02-16 2008-09-30 Ausmetec Pty. Ltd. Apparatus and process for inducing magnetism
EP2563520A4 (fr) * 2010-04-29 2017-06-28 Ausmetec Pty Ltd Appareil pour magnétisation continuelle d'une pâte
EP3424600A4 (fr) * 2017-01-11 2019-11-27 Institute of Process Engineering, Chinese Academy of Sciences Système de séparation magnétique continu assisté par gaz pour procédé entier
WO2021089988A1 (fr) * 2019-11-04 2021-05-14 Romar International Limited Appareil et procédé de séparation de particules magnétiques de liquides et de boues

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