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WO2019008216A1 - Procédé de flottation par mousse et agencement de flottation par mousse - Google Patents

Procédé de flottation par mousse et agencement de flottation par mousse Download PDF

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Publication number
WO2019008216A1
WO2019008216A1 PCT/FI2017/050504 FI2017050504W WO2019008216A1 WO 2019008216 A1 WO2019008216 A1 WO 2019008216A1 FI 2017050504 W FI2017050504 W FI 2017050504W WO 2019008216 A1 WO2019008216 A1 WO 2019008216A1
Authority
WO
WIPO (PCT)
Prior art keywords
froth
tank
overflow
lip
height
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/FI2017/050504
Other languages
English (en)
Inventor
Tatu Miettinen
Rodrigo Grau
Alejandro YANEZ
Zakaria MÖNKÄRE
Jere Tuominen
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.)
Outotec Finland Oy
Original Assignee
Outotec Finland Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Outotec Finland Oy filed Critical Outotec Finland Oy
Priority to PCT/FI2017/050504 priority Critical patent/WO2019008216A1/fr
Publication of WO2019008216A1 publication Critical patent/WO2019008216A1/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
    • B03D1/14—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
    • B03D1/1443—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
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B03D1/22—Flotation machines with impellers; Subaeration machines with external blowers

Definitions

  • the invention relates to a froth flotation method and a froth flotation arrangement, and particularly to a froth flotation method and a froth flotation arrangement for treating mineral ore particles suspended in slurry.
  • a froth flotation method and arrangement is used for treating mineral ore particles suspended in slurry.
  • An object of the present invention is thus to provide a method and an arrangement having an improved froth collection lauder lip loading and a froth recovery.
  • the objects of the invention are achieved by a method and an arrangement which are characterized by what is stated in the independent claims.
  • the preferred embodiments of the invention are disclosed in the dependent claims.
  • the invention is based on the idea of a froth flotation method for treating mineral ore particles suspended in slurry, comprising a flotation tank for separating the slurry into an underflow and an overflow.
  • the arrangement comprises a primary line comprising at least three flotation tanks connected in series, wherein each subsequent flotation tank is arranged to receive the underflow from the previous flotation tank.
  • the method comprises the steps of: feeding a slurry to a tank through a slurry inlet, the tank has at least 200 m 3 volume, and the tank comprises an available froth surface area.
  • the tank comprises a froth collection launder comprising a froth overflow lip, and the overflow lip has total length of the overflow lips in horizontal direction.
  • the tank has a diameter at the height of the impeller, where the diameter of the tank is calculated as an average at the height of an impeller.
  • the ratio between the effective height and the diameter of the tank is less than 1,5.
  • the third tank or subsequent tank in the series comprises a ratio between a total length of the overflow lips in horizontal direction and a square root of an available froth surface area is 4-20.
  • the method further comprises the steps of: causing the froth to flow over the froth overflow lip of the froth collection lauder by controlling the froth level, wherein the froth overflow lip of the third tank or subsequent tank in the series comprises an edge portion with variable height in the vertical direction, and controlling the froth level to be vertically higher than the vertically lowest edge height of the lip and vertically lower than the vertically highest edge height of the lip, and controlling the slurry level to be lower than the vertically lowest edge height of the lip.
  • the invention is based on the idea of a froth flotation arrangement for treating mineral ore particles suspended in slurry, comprising a flotation tank for separating the slurry into an underflow and an overflow.
  • the arrangement comprises a primary line comprising at least three flotation tanks connected in series, wherein each subsequent flotation tank is arranged to receive the underflow from the previous flotation tank.
  • the arrangement further comprising a tank comprising an impeller within the tank and a gas supply.
  • the tank volume comprises at least 200 m 3 and the tank comprises an available froth surface area.
  • the tank comprises a froth collection launder comprising a froth overflow lip, and the overflow lip has total length of the overflow lips in horizontal direction, and there is an effective height from a bottom of the tank to the lip of the froth collection launder.
  • the tank has a diameter at the height of the impeller, where the diameter of the tank is calculated as an average at the height of an impeller.
  • the ratio between the effective height and the diameter of the tank is less than 1,5.
  • the third tank or subsequent tank in the series comprises a ratio between a total length of the overflow lips in horizontal direction and a square root of an available froth surface area which is 4-20.
  • the froth overflow lip of the third tank or subsequent tank in the series comprises an edge portion with variable height in the vertical direction, and the arrangement comprises means for controlling the froth level to be vertically higher than the vertically lowest edge height of the froth overflow lip and vertically lower than the vertically highest edge height of the froth overflow lip.
  • An effect of the method and arrangement of the invention is a better froth handling.
  • the froth overflow lip comprising an edge portion with variable height in the vertical direction reduces the cross sectional surface for the froth to flow over the overflow lips while the total length of the overflow lips remains the same. This allows to adjust the overflow lip load. Further, the method and arrangement of the invention allows the use of multiple internal collection launders to decrease the travel time of bubble-particle aggregates.
  • Figure 1 shows a froth flotation tank
  • Figure 2 illustrates a part view of a froth collection launder
  • Figures 3a-d show an overflow lip edge
  • Figure 4 shows a froth flotation tank
  • Figure 5 shows a top view of a froth flotation tank
  • Figure 6 shows a primary line in a froth flotation arrangement.
  • Figures 1 and 4 show a froth flotation tank 2.
  • the froth flotation tank 2 comprising an impeller 3 within the tank 2 and a gas supply 4.
  • the tank 2 volume comprises at least 200 m 3 .
  • the tank 2 volume comprises the volume of the tank 2 surrounding the slurry 8 measured from the bottom 5 of the tank 2 to height of a lip 6 of the froth collection launder 7.
  • the tank 2 contains slurry 8 which is a mixture of solid particles in a carrier liquid, e.g. mineral particles in water.
  • the agitator 9 disperses air in the slurry 8, pumps slurry 8, keeps solids in the suspension and provides an environment in the tank 2 for interaction of bubbles and hydrophobic particles and their subsequent attachment and therefore separation of valuable mineral particles from the undesired gangue mineral particles.
  • the agitator may also comprise a stator 18 for providing a more stable air dispersion as shown in Figure 1.
  • a stator 18 surrounds the impeller 3.
  • the agitator 9 comprises an impeller 3 and a drive assembly for rotating the impeller.
  • the drive assembly may comprise a motor 10 and a drive shaft 11.
  • a gas supply 4 comprises pressurized or self-aspirating gas supply.
  • pressurized gas supply systems are pipes or tubes delivering gas to the bottom part of the tank. Gas may be supplied to the impeller 3 area also through conduits formed to the agitator 9.
  • the bubble— particle aggregates move up in the froth flotation tank 2 by buoyancy forming a froth layer 12 on the surface.
  • the froth 12 comprises water, bubbles and particles.
  • the tank 2 further comprises a froth collection launder 7.
  • the froth collection launder 7 is an inclined drainage module which collects froth 12 from the surface. In the Figures the froth collection launders 7 are located on the top of the tank 2, and enable the transportation of froth 12 or concentrate product out of the tank 2. The out of the tank 2 transported froth 12 or concentrate product form the overflow 20 separated from the slurry 8.
  • the froth flotation tank 2 can have one or more froth collection launders 7 which can be either internal or external, double, radial, depending on the capacity of the froth collection launder 7 necessary for the froth 12 removal.
  • froth collection launders 7 can be either internal or external, double, radial, depending on the capacity of the froth collection launder 7 necessary for the froth 12 removal.
  • Figure 5 two different types of froth collection launders 7 are shown, a central froth collection launder 7 in the middle of the tank 2 and an internal froth collection launder 7 adjacent a periphery of the tank 2.
  • the froth collection launder 7 comprises a froth overflow lip 6.
  • the ratio L tot/ J A froth between a total length of the overflow lips 6 in hori- zontal direction x and a square root of an available froth surface area is 4-20.
  • the available froth 12 surface area A froth is the horizontal area at the top of the tank 2 which is open for the froth 12 to flow at the height of the lip 6.
  • the available froth 12 surface area A froth is shown with a hatch pattern in Figure 5.
  • the froth overflow lip 6 comprises an edge portion 13 with variable height in the vertical direction y.
  • the arrangement comprises means for controlling the froth level 14 to be vertically higher than the vertically lowest edge height hi of the lip and vertically lower than the vertically highest edge height h2 of the lip 6.
  • a froth flotation method for treating mineral ore particles suspended in slurry valuable material is extracted from a slurry.
  • a flotation tank the slurry is separated into an underflow 19 and an overflow 20.
  • the arrangement comprises a primary line comprising at least three flotation tanks connected in series, wherein each subsequent flotation tank is arranged to receive the underflow 19 from the previous flotation tank.
  • Froth flotation is a physical separation method for separating particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in a mineral/water slurry 8.
  • the slurry 8 is fed to a tank 2 through a slurry inlet 15 and the underflow 19 is discharged through a underflow outlet 16.
  • the tank 2 comprises at least 200 m 3 volume.
  • the tank 2 further comprises a froth collection launder 7 comprising a froth overflow lip 6.
  • the third tank or subsequent tank in the series comprises the ratio L tot/ J A froth between a total length of the overflow lips L tot in horizontal direction x and a square root of an available froth surface area A froth is 4-20.
  • gas bubbles are introduced to the tank 2 through a gas supply 4, the slurry 8 and the gas is mixed with the impeller 3 within the tank 2.
  • the formed bubble— particle aggregates move up in the froth flotation tank 2 by buoyancy forming a froth 12 layer on the surface.
  • the valuable material is captured from the slurry 8 to the gas bubbles creating a froth 12.
  • the froth 12 is caused to flow over the froth overflow lip 6 of the froth collection lauder 7 by con- trolling the froth level 14, wherein the froth overflow lip 6 comprises an edge portion 13 with variable height h in the vertical direction y.
  • the froth level 14 is controlled to be vertically higher than the vertically lowest edge height hi of the lip 6 and vertically lower than the vertically highest edge height h2 of the lip 6.
  • the slurry level 17 is controlled to be lower than the vertically lowest edge height hi of the lip.
  • the froth overflow lip 6 comprising an edge portion 13 with variable height h in the vertical direction y reduces the cross sectional surface for the froth 12 to flow over the overflow lips 6 while the total length of the overflow lips L tot remains the same. This allows to adjust the overflow lip 6 load.
  • An effect of the edge portion 13 with variable height h in the vertical direction y is that the amount of the froth 12 flow over the overflow lip 6 can be set to be adequate to prevent the froth 12 from drying on the overflow lip 6 surface. Thus the overflow lip 6 surface remains clean.
  • the risk of froth 12 drying on the overflow lip 6 surface is sig- nificant with large froth flotation tank 2 sizes.
  • large froth flotation tanks 2 multiple internal froth collection launders 7 are necessary for obtaining a more effective froth transportation required due to the increase of the travel time of bubble- particle aggregates which results in a high drop-back and a low froth recovery.
  • Multiple internal froth collection launders 7 means an increase to the length of the overflows lip 6 in a froth collection tank 2.
  • a distance between the lengths in the overflow lips open for the froth 12 to flow over the froth overflow lip 6 in horizontal direction x at the froth level 14 is less than 50 cm.
  • the froth 12 layer adjacent to an overflow lip 6 has an open flow path into the froth launder 7 at less than 50 cm intervals.
  • An excessive length between the open flow paths for the froth 12 creates easily dead zones where the froth 12 does not move.
  • the effective length of the overflow lips L e ff is calculated at the height of the froth top surface level 14.
  • the ratio between a height from a bottom 5 of the tank 2 to the lip 6 of the froth collection launder 7 and the square root of a pulp area h/ jA pulp is less than 1,5, where the pulp area A pu i P is calculated as an average from the cross sectional areas of the tank 2 at the height h3 of the impeller 3.
  • Figure 2 illustrates a part view of a froth collection launder 7.
  • the froth 12 layer is above the slurry 8 in vertical direction y.
  • the froth level 14 is vertically higher than the vertically lowest edge height hi of the froth overflow lip 6 to allow the flow of the froth 12 over the overflow lip 6.
  • the froth level 14 is vertically lower than the vertically highest edge height h2 of the lip 6.
  • the slurry level 17 may be controlled for controlling the flow of the froth 12 over the overflow lip 6.
  • the slurry level 17 is vertically y lower than the vertically low- est edge height hi of the froth overflow lip 6 to prevent the flow of the slurry 8 over the overflow lip 6.
  • the edge portion 13 with a variable height h allows a refined controlling of the flow of the froth 12 over the overflow lips 6.
  • the froth level 14 rises the increase of the cross sectional surface for the froth 12 to flow over the overflow lips 6 is smaller than with a straight edge.
  • a froth is preferably between 8-16 as it provides optimal travel time of the bubble-particle aggregates but not too much overflow lip 6 length.
  • Figures 3a-d show several shapes of froth overflow lip edges 13.
  • the froth overflow lip edgesl3 comprise notched lip edges 13.
  • L tot between effective length of the overflow lips L e ff and the total length of the overflow lips L tot in horizontal direction (x) is in range of 0,2-0,6.
  • the effective length of the overflow lips L e ff is the sum of lengths in the overflow lips 6 open for the froth 12 to flow over the overflow lip 6 in horizontal direction x at the froth level 14.
  • the overflow lip edge portion 13 comprises columns projecting in vertical direction y.
  • the overflow lip edge portion 13 comprises a mixture of columns and serrated edge portion.
  • the overflow lip edge portion 13 comprises a serrated edge portion 13.
  • the overflow lip edge portion 13 comprises an undulated edge portion 13.
  • the height variation dh in the edge portion 13 is at least 2 cm, preferably 5 cm.
  • the froth level 14 controlling can be performed at least in a range defined by the distance between the vertically lowest edge height hi and the vertically highest edge height h2 of the froth overflow lip 6 which is at least 2 cm, preferably 5 cm.
  • Figure 6 shows a froth flotation arrangement with three flotation tanks 2.
  • the arrangement can comprise more than three flotation tanks 2.
  • the flotation tank 2 separates the slurry 8 into an underflow 19 and an overflow 20.
  • the primary line 1 comprises three flotation tanks 2 which are connected in series. Each subsequent flotation tank 2 is arranged to receive the underflow 19 from the previous flotation tank 2.
  • a froth available froth surface area dh a height variation; h height; hi, h2 an edge height; h3 a height of the impeller; L e ff the effective length of the overflow lips; L tot a total length of overflow lips; y vertical direction; x horizontal direction.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
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Abstract

L'invention est fondée sur l'idée d'un procédé de flottation par mousse qui permet de traiter des particules de minerai en suspension dans une boue. Le procédé de flottation par mousse comprend une cuve de flottation qui permet de séparer la boue en une sous-verse (19) et en un trop-plein (20). L'agencement comprend une ligne primaire comportant au moins trois cuves de flottation reliées en série, chaque cuve de flottation suivante étant conçue pour recevoir la sous-verse (19) de la cuve de flottation précédente. Le procédé comprend les étapes consistant : à introduire une boue (8) dans une cuve (2) par l'intermédiaire d'une entrée (15) de boue, la cuve (2) ayant un volume d'au moins 200 m3, et la cuve (2) comportant une surface de mousse disponible (Afroth). La cuve (2) comprend une goulotte (7) de récupération de mousse comportant une lèvre (6) de trop-plein de mousse, la lèvre (6) de trop-plein ayant une longueur totale de lèvres de trop-plein (L tot) dans la direction horizontale (x). Il y a une hauteur efficace (h) à partir d'un fond (5) de la cuve jusqu'à la lèvre (6) de la goulotte (7) de récupération de mousse. Le diamètre de la cuve au niveau de la hauteur de la roue à aubes est (D), le diamètre de la cuve étant calculé en tant que moyenne à la hauteur d'une roue à aubes (h3). Le rapport entre la hauteur efficace (h) et le diamètre (D) de la cuve (h/) est inférieur à 1,5. Le procédé consiste à introduire des bulles de gaz dans la cuve par l'intermédiaire d'une alimentation en gaz (4), à mélanger la boue (8) et le gaz au moyen de la roue à aubes (3) à l'intérieur de la cuve (2), et à capturer le matériau de valeur dans la boue (8) jusqu'aux bulles de gaz créant une mousse (12). La troisième cuve ou la cuve suivante de la série comporte un rapport L tot/ √A froth entre une longueur totale des lèvres de trop-plein (L tot) dans la direction horizontale (x) et une racine carrée d'une surface de mousse disponible (A froth) est de 4-20. Le procédé comprend en outre les étapes consistant : à amener la mousse (12) à s'écouler sur la lèvre (6) de trop-plein de mousse de la goulotte (7) de récupération de mousse par commande du niveau (14) de mousse, la lèvre (6) de trop-plein de mousse de la troisième cuve ou de la cuve suivante dans la série comportant une partie bord (13) de hauteur (h) variable dans la direction verticale (y), et à commander le niveau (14) de mousse afin qu'il soit verticalement plus haut par rapport à la hauteur verticalement la plus basse (h1) du bord de la lèvre (6) et verticalement plus bas par rapport à la hauteur verticalement la plus élevée (h2) du bord de la lèvre (6), et à commander le niveau (17) de boue afin qu'il soit plus bas par rapport à la hauteur verticalement la plus basse (h1) du bord de la lèvre (6). L'invention concerne également un agencement de flottation par mousse.
PCT/FI2017/050504 2017-07-04 2017-07-04 Procédé de flottation par mousse et agencement de flottation par mousse Ceased WO2019008216A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI2017/050504 WO2019008216A1 (fr) 2017-07-04 2017-07-04 Procédé de flottation par mousse et agencement de flottation par mousse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2017/050504 WO2019008216A1 (fr) 2017-07-04 2017-07-04 Procédé de flottation par mousse et agencement de flottation par mousse

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WO2019008216A1 true WO2019008216A1 (fr) 2019-01-10

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE363816C (de) * 1919-05-08 1922-11-14 Elektro Osmose Akt Ges Graf Sc Vorrichtung zur Erzaufbereitung nach dem Schaumschwimmverfahren
US6019898A (en) * 1998-06-23 2000-02-01 Aqua-Aerobic Systems, Inc. Weir assembly with movable baffle member
WO2003078013A2 (fr) * 2002-03-18 2003-09-25 Outokumpu Oyj Dispositif et procede de flottation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE363816C (de) * 1919-05-08 1922-11-14 Elektro Osmose Akt Ges Graf Sc Vorrichtung zur Erzaufbereitung nach dem Schaumschwimmverfahren
US6019898A (en) * 1998-06-23 2000-02-01 Aqua-Aerobic Systems, Inc. Weir assembly with movable baffle member
WO2003078013A2 (fr) * 2002-03-18 2003-09-25 Outokumpu Oyj Dispositif et procede de flottation

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