EP2415527B1 - Aeration device for a flotation cell, flotation cell and flotation method - Google Patents

Aeration device for a flotation cell, flotation cell and flotation method Download PDF

Info

Publication number
EP2415527B1
EP2415527B1 EP10171860.9A EP10171860A EP2415527B1 EP 2415527 B1 EP2415527 B1 EP 2415527B1 EP 10171860 A EP10171860 A EP 10171860A EP 2415527 B1 EP2415527 B1 EP 2415527B1
Authority
EP
European Patent Office
Prior art keywords
gas
flotation
longitudinal axis
nozzle
orifice
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.)
Not-in-force
Application number
EP10171860.9A
Other languages
German (de)
French (fr)
Other versions
EP2415527A1 (en
Inventor
Stefan Blendinger
Robert Fleck
Gerold Franke
Lilla Grossmann
Werner Hartmann
Wolfgang Krieglstein
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.)
Siemens AG
Original Assignee
Siemens AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=43431225&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2415527(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP10171860.9A priority Critical patent/EP2415527B1/en
Priority to DK10171860.9T priority patent/DK2415527T3/en
Priority to PL10171860T priority patent/PL2415527T3/en
Priority to PE2013000194A priority patent/PE20131056A1/en
Priority to PCT/EP2011/056223 priority patent/WO2012016721A1/en
Priority to AU2011287891A priority patent/AU2011287891B2/en
Priority to US13/814,050 priority patent/US8794446B2/en
Publication of EP2415527A1 publication Critical patent/EP2415527A1/en
Publication of EP2415527B1 publication Critical patent/EP2415527B1/en
Application granted granted Critical
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • B03D1/24—Pneumatic
    • B03D1/242—Nozzles for injecting gas into the flotation tank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
    • 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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0422—Numerical values of angles

Definitions

  • the invention relates to a gassing device for a flotation cell, a flotation cell equipped with at least one such gassing device, and a method for flotation of valuable particles from a suspension.
  • Flotation is a physical separation process for separating fine-grained mixtures of solids, such as ores and gangue, in an aqueous slurry by means of air bubbles due to a different surface wettability of the particles contained in the suspension. It is used for the treatment of mineral resources and in the processing of preferably mineral substances with a low to moderate content of a useful component or a valuable material, for example in the form of non-ferrous metals, iron, metals of rare earths and / or precious metals and non-metallic mineral resources.
  • the WO 2006/069995 A1 describes a pneumatic flotation cell with a housing comprising a flotation chamber, with at least one nozzle arrangement, here referred to as ejectors, further with at least one gassing device, when using air aeration devices or aerators called, and a collecting container for a foam product formed in the flotation.
  • a suspension of water and fine-grained solid mixed with reagents is generally introduced into a flotation chamber via at least one nozzle arrangement.
  • the purpose of the reagents is to ensure that, in particular, the valuable particles or valuable material particles which are preferably to be separated off are made hydrophobic in the suspension become.
  • xanthates are used as reagents, in particular to selectively hydrophobize sulfidic ore particles.
  • the at least one nozzle arrangement is supplied with gas, in particular with air, which comes into contact with the hydrophobic particles in the suspension.
  • the hydrophobic particles adhere to forming gas bubbles, so that the gas bubble structures, also called aeroflocs, float and form the foam product on the surface of the suspension.
  • the foam product is discharged into a collecting container and usually thickened.
  • the quality of the foam product or the separation efficiency of the flotation process depends inter alia on the probability of collision between a hydrophobic particle and a gas bubble.
  • a preferred diameter of the gas bubbles is less than about 5 mm and is in particular in the range between 1 and 5 mm.
  • Such small gas bubbles have a high specific surface area and are therefore able to bind and take up significantly more valuable material particles, in particular ore particles, per amount of gas used than larger gas bubbles are capable of doing.
  • gas bubbles larger in diameter increase faster than gas bubbles of smaller diameter.
  • the smaller gas bubbles are collected by larger gas bubbles and combine with them to even larger gas bubbles. This reduces the available specific surface of the gas bubbles in the suspension, can be bound to the valuable particles.
  • hybrid flotation cells which represent a combination of a pneumatic flotation cell with a columnar flotation cell
  • larger particulate matter having particle diameters in the range of 50 microns and larger are not completely bound to the existing gas bubbles and thus can only be partially separated from the suspension. Fines with particle diameters in the range of 20 microns and less, however, are particularly well deposited.
  • Gas bubbles having a diameter in the range from 1 to 5 mm are continuously present in a column-like flotation cell over the height of the flotation chamber, so that a reduction in the diameter of the gas bubbles generated in the lower region of the flotation chamber or by a gassing device in the flotation chamber is required. So far, in the flotation gassing with gas outlet openings are used, whose diameter is in the range of 3 to 5 mm and in columnar flotation cells to gas bubble formation with significantly large gas bubbles, in particular greater than 5 mm in diameter, lead.
  • gas outlet openings with diameters of up to 1 mm on gassing devices easily clog, as long as usually suspensions with solids contents to be processed in the range of 30 to 40%. Even with short downtimes of the flotation cell particles from the suspension penetrate into the gas outlet openings and close them. When restarting the cell, the gas pressure of the gas to be introduced into the suspension is often insufficient to flush such small gas outlet openings of a gassing device freely again.
  • a gassing device for a flotation cell comprising a central gas pipe with a central gas opening, to which connect at least two connecting pipes, each with a connecting gas opening, wherein the connecting pipes are aligned at a right angle ⁇ to a longitudinal axis of the central gas pipe, wherein the central gas opening with wherein each connecting pipe is connected at its end facing away from the central gas pipe with at least one gas injection unit, wherein each gas injection unit comprising a gas supply pipe with a gas supply opening and a gas distributor is formed with a gas distribution chamber into which opens the gas supply opening, wherein the gas distributor further comprises a number of gas distributor nozzles, each having at least one tubular nozzle opening and at least one gas outlet opening, wherein each nozzle opening connected on the one hand to the gas distributor space and on the other hand to at least one gas outlet opening at an end of the gas distributor nozzle facing away from the gas supply tube, the gas distributor nozzles being arranged at a uniform distance from one another about this longitudinal axis L1
  • the arrangement of the gas outlet openings of the gas injection unit makes it possible for a gas to be sprayed into it in a particularly finely distributed manner against a direction of movement R of a suspension. As a result, an intimate mixing of suspension and gas bubbles is ensured, so that the yield of a flotation cell, which is equipped with at least one gassing device according to the invention, is significantly increased.
  • the longitudinal axis L2, L2 'of the nozzle opening and the longitudinal axis L1 of the gas supply tube can lie in one plane per gas distributor nozzle.
  • the longitudinal axis L2, L2 'of each nozzle opening and the longitudinal axis L1 of the gas supply tube are preferably aligned at an angle ⁇ in the range of 30 ° to 70 °, in particular at an angle ⁇ of 45 °, they are not arranged in one plane.
  • the gas outlet opening lies laterally of the longitudinal axis L1 of the gas supply pipe, the longitudinal axis L1 of the gas supply pipe and the longitudinal axis L2, L2 '
  • the nozzle opening in exactly this view in particular an angle ⁇ in the range of> 0 ° to 60 ° limit.
  • the gas distributor preferably has four gas distributor nozzles. As a result, the gas is mixed thoroughly into a suspension. However, it is also possible to provide only two, three or more than four gas distributor nozzles.
  • each gas outlet opening preferably has a diameter in the range of 1 to 5 mm.
  • exclusively gas bubbles with a diameter in the range of 1 to 5 mm are present over the entire height of the flotation chamber in the suspension, which allow optimal separation of the valuable material particles and a high yield.
  • the gassing device has the central gas pipe with a central gas opening, to which at least two connecting pipes each having a connecting gas opening connect, wherein the connecting pipes are aligned at a right angle ⁇ to a longitudinal axis LZ of the central gas pipe, the central gas opening being connected to the connecting gas openings, and wherein each connecting pipe is connected at its end facing away from the central gas pipe with at least one gas injection unit, wherein the connecting gas openings are connected to the nozzle openings.
  • two connecting tubes are arranged symmetrically to the longitudinal axis LZ of the central gas pipe opposite each other on the central gas pipe. This symmetrical embodiment stabilizes the desired position of the gas injector units in the flotation chamber.
  • the longitudinal axis L1 of a gas feed tube is preferably aligned at an angle, in particular a right angle, to a longitudinal axis LV of the respective connecting tube such that an injection of gas via the gas outlet openings is achieved against the direction of movement R of the suspension in the flotation chamber.
  • a gas injector unit is pivotally attached to a connecting pipe to ensure a quick and easy adjustment and optimization of the position of the gas outlet openings against the current direction of movement R of the suspension in a flotation chamber.
  • This can be realized by a fixable in a selected position joint, which is arranged between the connecting pipe and the gas injection unit, and the like.
  • the flotation cell in particular a columnar flotation cell or hybrid flotation cell, comprising a housing with a flotation chamber, at least one nozzle arrangement for supplying gas and a suspension in the flotation and at least one gasification device according to the invention for further supply of gas into the flotation by each gas injector unit is disposed in the flotation chamber below the at least one nozzle assembly.
  • At least part of the gas outlet openings is aligned counter to a local direction of movement R of the suspension in the housing, wherein the longitudinal axes L1 of the gas supply pipes are aligned at an angle of 0 ° to a maximum of 90 ° to the local direction of movement R of the suspension in the housing.
  • the flotation cell according to the invention ensures a high separation efficiency and thus a yield of valuable material particles, since the setting of suitable diameters of the gas bubbles in the entire flotation chamber and a particularly intimate mixing of the gas bubbles produced with the suspension can be achieved by means of the at least one gasification device.
  • the flotation cell is preferably a columnar flotation cell in which a diameter of the flotation chamber is many times smaller than its height.
  • it is a hybrid flotation cell formed by a columnar flotation cell combined with a pneumatic flotation cell.
  • the effect of formation of gas bubbles of excessive diameter which is reinforced here due to the columnar construction of these flotation cells, is counteracted by means of the gassing device according to the invention.
  • Already existing flotation cells can be equipped in a simple manner with at least one gassing device according to the invention and thereby their performance can be increased.
  • the housing of the flotation cell has, in a preferred embodiment, a cylindrical housing section whose axis of symmetry is arranged vertically.
  • the central gas pipe is preferably vertical and the connecting pipes are preferably arranged horizontally in the flotation chamber.
  • the connecting pipes are preferably arranged horizontally in the flotation chamber.
  • the longitudinal axes L1 of the gas supply pipes are preferably arranged at an angle in the range of 0 ° to 20 ° to the local direction of movement R of the suspension in the housing in the opposite direction, in order to intensify the mixing of gas bubbles and suspension.
  • gas which is introduced into a flotation chamber in a pneumatic flotation cell by means of the gassing device and / or the nozzle arrangement preference is given to using air or nitrogen.
  • the object is further achieved for the process for flotation of valuable particles, in particular ore minerals, from a suspension having a solids content in the range of 30 to 40% to form a foam product by means of a flotation cell according to the invention.
  • FIG. 1 shows a part 1 of a gassing device 1 "according to FIG. 5 in the front view.
  • FIG. 2 shows the part 1 of the gassing device 1 "according to FIG. 5 in a longitudinal section.
  • the gas injection unit 2 includes a gas supply pipe 2a having a gas supply opening 2a 'and a gas distributor 2b having a gas distribution space 2b ', in which the gas supply opening 2a' opens.
  • the gas distributor 2b further comprises four gas distributor nozzles 2c each having a tubular nozzle opening 2c 'and a gas outlet opening 2d, wherein each nozzle opening 2c' is connected on the one hand to the gas distributor chamber 2b 'and on the other hand to a gas outlet opening 2d on an end of the gas distributor nozzle 2c remote from the gas supply pipe 2a ,
  • four gas distributor nozzles 2c are present here, which are grouped around the same in the direction of the longitudinal axis L1 of the gas supply pipe 2a, at a uniform distance from one another.
  • Each two gas distributor nozzles 2c are arranged opposite one another symmetrically with respect to the longitudinal axis L1 of the gas supply pipe 2a.
  • a longitudinal axis L2, L2 'of each nozzle opening 2c' is oriented at an angle ⁇ of 45 ° to the longitudinal axis L1 of the gas supply pipe 2a in the direction of the end of the gas supply pipe 2a facing away from the gas distributor 2b.
  • a gas 7 flowing into the gas supply pipe 2a flows through the gas supply opening 2a ', passes into the gas distribution space 2b' and then into the nozzle openings 2c 'to finally discharge via the gas outlet openings 2d.
  • FIG. 3 shows a part 1 'in the form of a further gas injection unit 2 of a further gassing device in a longitudinal section, which has a particularly robust embodiment.
  • the same reference numerals as in FIGS. 1 and 2 denote the same elements.
  • the gas injection unit 2 also includes a gas supply pipe 2a having a gas supply port 2a 'and a gas distributor 2b having a gas distribution chamber 2b' into which the gas supply port 2a 'opens.
  • the gas supply pipe 2a is here closed on one side.
  • the gas distributor 2b here comprises four gas distributor nozzles 2c integrated in the closed end of the gas supply tube 2a, each having a tubular nozzle opening 2c 'and a gas outlet opening 2d, wherein each nozzle opening 2c' on the one hand with the gas distributor chamber 2b 'and on the other hand with a gas outlet opening 2d is connected to an end of the gas distributor nozzle 2b facing away from the gas supply pipe 2a.
  • a tapered gas feed tube 2a can be used here and mounted on the top of a cap and secured, wherein the gas distribution chamber 2b ', the gas distributor nozzles 2c with the nozzle openings 2c' and the gas outlet openings 2d due to the contour of the tip and the Contour of the, the tip-facing side of the cap arise.
  • the associated gas outlet opening 2d lies laterally of the longitudinal axis L1 of the gas supply pipe 2a, the longitudinal axis L1 of the gas supply pipe 2a and the longitudinal axis L2, L2 'of the nozzle opening 2c in exactly this view define an angle ⁇ in the range of> 0 ° to 60 °.
  • FIG. 4 shows the further gas injection unit 2 according to FIG. 3 in cross-section from above, wherein the arrangement and orientation of the gas distributor nozzles 2c is clearly visible.
  • FIG. 5 shows a gassing device 1 "in a three-dimensional view
  • the gassing device 1" comprises a central gas pipe 3 with a central gas opening 3a, to which here four connecting pipes 4a, 4b, 4c, 4d, each with a Connecting gas opening 4a ', 4b', 4c ', 4d' connect.
  • the connecting pipes 4a, 4b, 4c, 4d are aligned at a right angle ⁇ to the longitudinal axis LZ of the central gas pipe 3.
  • the central gas opening 3a is connected to the connecting gas openings 4a ', 4b', 4c ', 4d', wherein each connecting pipe 4a, 4b, 4c, 4d at its end facing away from the central gas pipe 3, each with a gas injection unit 2 (see FIGS. 1 and 2) is connected, and wherein the connecting gas openings 4a ', 4b', 4c ', 4d' are connected to the nozzle openings 2c '.
  • the gas injection units 2 can be pivotally mounted on the connecting pipe 4a, 4b, 4c, 4d (see arrows), so that an optimal spatial orientation and rapid adjustment of the positioning of the gas outlet openings 2d with respect to the present in a flotation cell spiraling direction R of the suspension in Area of the gas outlet openings 2d is possible.
  • the gas injection units 2 are preferably aligned with respect to the plane in which the distribution pipes are at an angle of about 20 to 30 ° upwards, provided that the suspension spiral from top to bottom in the flotation 120 (see FIG. 5 ) emotional.
  • FIG. 2 shows a columnar flotation cell 100, here a hybrid flotation cell, with a housing 110 that includes a flotation chamber 120.
  • the left side of the flotation cell 100 is shown in front view, the right side in section.
  • Within the flotation chamber 120 is a foam channel 130 with nozzle 131 for discharging the foam product formed.
  • the flotation chamber 120 is equipped with nozzle arrangements 140 for supplying a mixture 8 of gas, in particular air, and a suspension comprising recyclable material particles to be separated into the flotation chamber 120.
  • the suspension here has a high solids content in the range of 30 to 40%.
  • the housing 110 has a cylindrical housing section 110a, in the center of which the gassing arrangements 1 "according to FIG FIG. 5 is used.
  • the housing 110 also has a Floor discharge opening 150 on.
  • the upper edge of the outer wall of the housing 110 is located above the upper edge of the foam channel 130, whereby an overflow of the foam product formed over the upper edge of the housing 110 is excluded.
  • Particles of the suspension which are provided, for example, with an insufficiently hydrophobized surface or have not collided with a gas bubble, and hydrophilic particles sink in the direction of the bottom discharge opening 150 and are discharged via this.
  • additional gas 7, in particular air is blown into the cylindrical housing section 110a, so that further hydrophobic particles are bound thereto and rise.
  • the orientation of at least some of the gas outlet openings 2d of the respective gas injection units 2 in such a way that the gas 7 is injected counter to the spiraling direction of movement R of the suspension ensures intimate mixing of suspension and gas bubbles, so that the yield of the flotation cell 100 is increased.
  • the position of the gas injection units 2 can be changed in the direction of the longitudinal axis LZ of the central tube 3 up or down and thereby optimized.
  • the hydrophilic particles continue to sink and are discharged via the bottom discharge opening 150.
  • the foam product containing the valuable material particles passes from the flotation chamber 120 into the foam channel 130 and is discharged via the nozzles 131 and optionally thickened.
  • FIG. 7 shows the flotation cell 100 in the plan view, wherein the position of the gassing device 1 "in the flotation chamber 120 can be seen.
  • a suspension having a solids content in the range from 30 to 40% comprising particles having a maximum particle diameter is floated.
  • the diameter of the gas outlet openings 2d is in the range of 1 to 5 mm.
  • gassing devices and flotation cells illustrated in the figures merely represent examples of a multiplicity of further possible embodiments of gassing devices according to the invention and of flotation cells provided therewith.
  • a person skilled in the art can also equip other flotation cells with one or a suitable number of gassing devices according to the invention.
  • gas injector units 1, 1 ' can be arranged in the flotation chamber 120 in such a way that the gas supply tube 2a is fastened to the cylindrical housing section 110a and the supply of gas 7 takes place through the cylindrical housing section 110a.
  • suitable flotation cells with regard to the design and arrangement of the flotation, the foam collector, the number of nozzle arrangements for injecting suspension and gas, etc., without departing from the spirit of the invention.
  • the gassing devices may have a different number of gas distributor nozzles, nozzle openings, gas outlet openings, connecting pipes and the like, their arrangement and orientation being able to vary from one another.

Description

Die Erfindung betrifft eine Begasungseinrichtung für eine Flotationszelle, eine mit mindestens einer derartigen Begasungseinrichtung ausgestattete Flotationszelle, sowie ein Verfahren zur Flotation von Wertstoffpartikeln aus einer Suspension.The invention relates to a gassing device for a flotation cell, a flotation cell equipped with at least one such gassing device, and a method for flotation of valuable particles from a suspension.

Die Flotation ist ein physikalisches Trennverfahren zur Trennung feinkörniger Feststoffgemenge, wie beispielsweise von Erzen und Gangart, in einer wässrigen Aufschlämmung bzw. Suspension mit Hilfe von Luftbläschen aufgrund einer unterschiedlichen Oberflächenbenetzbarkeit der in der Suspension enthaltenen Partikel. Sie wird zur Aufbereitung von Bodenschätzen und bei der Verarbeitung von vorzugsweise mineralischen Stoffen mit einem niedrigen bis mittleren Gehalt an einer Nutzkomponente bzw. eines Wertstoffs verwendet, beispielsweise in Form von Nichteisenmetallen, Eisen, Metallen der seltenen Erden und/oder Edelmetallen sowie nichtmetallischen Bodenschätzen.Flotation is a physical separation process for separating fine-grained mixtures of solids, such as ores and gangue, in an aqueous slurry by means of air bubbles due to a different surface wettability of the particles contained in the suspension. It is used for the treatment of mineral resources and in the processing of preferably mineral substances with a low to moderate content of a useful component or a valuable material, for example in the form of non-ferrous metals, iron, metals of rare earths and / or precious metals and non-metallic mineral resources.

Die WO 2006/069995 A1 beschreibt eine pneumatische Flotationszelle mit einem Gehäuse, das eine Flotationskammer umfasst, mit mindestens einer Düsenanordnung, hier als Ejektoren bezeichnet, weiterhin mit mindestens einer Begasungseinrichtung, bei Verwendung von Luft Belüftungseinrichtungen oder Aeratoren genannt, sowie einem Sammelbehälter für ein bei der Flotation gebildetes Schaumprodukt.The WO 2006/069995 A1 describes a pneumatic flotation cell with a housing comprising a flotation chamber, with at least one nozzle arrangement, here referred to as ejectors, further with at least one gassing device, when using air aeration devices or aerators called, and a collecting container for a foam product formed in the flotation.

Bei der pneumatischen Flotation wird generell eine mit Reagenzien versetzte Suspension aus Wasser und feinkörnigem Feststoff über mindestens eine Düsenanordnung in eine Flotationskammer eingebracht. Die Reagenzien sollen bewirken, dass insbesondere die wertvollen, bevorzugt abzutrennenden Partikel bzw. Wertstoffpartikel in der Suspension hydrophob ausgebildet werden. Meist werden als Reagentien Xanthate eingesetzt, insbesondere um sulfidische Erzpartikel selektiv zu hydrophobisieren. Gleichzeitig mit der Suspension wird der mindestens einen Düsenanordnung Gas, insbesondere Luft, zugeführt, das mit den hydrophoben Partikeln in der Suspension in Berührung kommt. Die hydrophoben Partikel haften an sich bildenden Gasbläschen an, so dass die Gasbläschen-Gebilde, auch Aeroflocken genannt, aufschwimmen und an der Oberfläche der Suspension das Schaumprodukt bilden. Das Schaumprodukt wird in einen Sammelbehälter ausgetragen und üblicherweise noch eingedickt.In pneumatic flotation, a suspension of water and fine-grained solid mixed with reagents is generally introduced into a flotation chamber via at least one nozzle arrangement. The purpose of the reagents is to ensure that, in particular, the valuable particles or valuable material particles which are preferably to be separated off are made hydrophobic in the suspension become. In most cases, xanthates are used as reagents, in particular to selectively hydrophobize sulfidic ore particles. Simultaneously with the suspension, the at least one nozzle arrangement is supplied with gas, in particular with air, which comes into contact with the hydrophobic particles in the suspension. The hydrophobic particles adhere to forming gas bubbles, so that the gas bubble structures, also called aeroflocs, float and form the foam product on the surface of the suspension. The foam product is discharged into a collecting container and usually thickened.

Die Qualität des Schaumprodukts bzw. der Trennerfolg des Verfahrens der Flotation ist unter anderem von der Kollisionswahrscheinlichkeit zwischen einem hydrophoben Partikel und einem Gasbläschen abhängig. Je höher die Kollisionswahrscheinlichkeit, desto größer ist die Anzahl an hydrophoben Partikeln, die an einem Gasbläschen anhaften, an die Oberfläche aufsteigen und zusammen mit den Partikeln das Schaumprodukt bilden.The quality of the foam product or the separation efficiency of the flotation process depends inter alia on the probability of collision between a hydrophobic particle and a gas bubble. The higher the probability of collision, the greater the number of hydrophobic particles that adhere to a gas bubble, rise to the surface and together with the particles form the foam product.

Ein bevorzugter Durchmesser der Gasbläschen ist dabei kleiner als etwa 5 mm und liegt insbesondere im Bereich zwischen 1 und 5 mm. Derart kleine Gasbläschen weisen eine hohe spezifische Oberfläche auf und sind daher in der Lage, deutlich mehr Wertstoffpartikel, insbesondere Erzpartikel, pro eingesetzte Menge an Gas zu binden und mit sich zu nehmen, als es größere Gasblasen in der Lage sind.A preferred diameter of the gas bubbles is less than about 5 mm and is in particular in the range between 1 and 5 mm. Such small gas bubbles have a high specific surface area and are therefore able to bind and take up significantly more valuable material particles, in particular ore particles, per amount of gas used than larger gas bubbles are capable of doing.

Generell steigen Gasbläschen mit größerem Durchmesser schneller auf als Gasbläschen kleineren Durchmessers. Dabei werden die kleineren Gasbläschen von größeren Gasbläschen aufgesammelt und vereinigen sich mit diesen zu noch größeren Gasblasen. Dadurch reduziert sich die zur Verfügung stehende spezifische Oberfläche der Gasbläschen in der Suspension, an der Wertstoffpartikel gebunden werden können.In general, gas bubbles larger in diameter increase faster than gas bubbles of smaller diameter. The smaller gas bubbles are collected by larger gas bubbles and combine with them to even larger gas bubbles. This reduces the available specific surface of the gas bubbles in the suspension, can be bound to the valuable particles.

Bei säulenartig ausgebildeten Flotationszellen, bei welchen ein Durchmesser der Flotationskammer um ein Vielfaches geringer ist als deren Höhe, ist der Weg, welchen ein Gasbläschen in der Suspension bzw. der Flotationskammer zurücklegen muss, um an die Oberfläche der Suspension zu gelangen, besonders groß. Aufgrund des besonders langen Weges entstehen in der Suspension besonders große Gasblasen. Dadurch sinkt der spezifische Austrag an Wertstoffpartikeln aus der Suspension und somit auch der Wirkungsgrad der Flotationszelle.In columnar flotation cells in which a diameter of the flotation chamber is many times smaller than its height, the path which a gas bubble must travel in the suspension or the flotation chamber in order to reach the surface of the suspension is particularly large. Due to the particularly long way, particularly large gas bubbles are formed in the suspension. This reduces the specific discharge of valuable particles from the suspension and thus also the efficiency of the flotation cell.

Bei sogenannten Hybridflotationszellen, die eine Kombination einer pneumatische Flotationszelle mit einer säulenartig ausgebildeten Flotationszelle darstellen, werden insbesondere größere Wertstoffpartikel mit Partikeldurchmessern im Bereich von 50 µm und größer nicht vollständig an die vorhandenen Gasbläschen gebunden und können somit nur zum Teil von der Suspension abgetrennt werden. Feinanteile mit Partikeldurchmessern im Bereich von 20 µm und weniger werden hingegen besonders gut abgeschieden.In so-called hybrid flotation cells, which represent a combination of a pneumatic flotation cell with a columnar flotation cell, larger particulate matter having particle diameters in the range of 50 microns and larger are not completely bound to the existing gas bubbles and thus can only be partially separated from the suspension. Fines with particle diameters in the range of 20 microns and less, however, are particularly well deposited.

Damit in einer säulenartig ausgebildeten Flotationszelle über die Höhe der Flotationskammer gesehen durchgängig Gasbläschen mit einem Durchmesser im Bereich von 1 bis 5 mm vorhanden sind, ist eine Verringerung der Durchmesser der im unteren Bereich der Flotationskammer bzw. durch eine Begasungseinrichtung in der Flotationskammer generierten Gasbläschen erforderlich. Bisher werden bei der Flotation Begasungseinrichtungen mit Gasaustrittsöffnungen verwendet, deren Durchmesser im Bereich von 3 bis 5 mm liegen und die in säulenartig ausgebildeten Flotationszellen zu einer Gasblasenbildung mit deutlich zu großen Gasblasen, insbesondere von größer als 5 mm Durchmesser, führen.Gas bubbles having a diameter in the range from 1 to 5 mm are continuously present in a column-like flotation cell over the height of the flotation chamber, so that a reduction in the diameter of the gas bubbles generated in the lower region of the flotation chamber or by a gassing device in the flotation chamber is required. So far, in the flotation gassing with gas outlet openings are used, whose diameter is in the range of 3 to 5 mm and in columnar flotation cells to gas bubble formation with significantly large gas bubbles, in particular greater than 5 mm in diameter, lead.

Eine weitere Reduzierung der Durchmesser der Gasaustrittsöffnungen von Begasungseinrichtungen ist in der Praxis kaum mehr möglich. So verstopfen Gasaustrittsöffnungen mit Durchmessern von bis zu 1 mm an Begasungseinrichtungen leicht, sofern üblicherweise zu verarbeitende Suspensionen mit Feststoffgehalten im Bereich von 30 bis 40 % eingesetzt werden. Bereits bei kurzen Stillstandszeiten der Flotationszelle dringen Partikel aus der Suspension in die Gasaustrittsöffnungen ein und verschließen diese. Beim erneuten Anfahren der Zelle reicht der Gasdruck des in die Suspension einzubringenden Gases oft nicht aus, um derart kleine Gasaustrittsöffnungen einer Begasungseinrichtung wieder frei zu spülen.A further reduction in the diameter of the gas outlet openings of gassing devices is hardly possible in practice. Thus, gas outlet openings with diameters of up to 1 mm on gassing devices easily clog, as long as usually suspensions with solids contents to be processed in the range of 30 to 40%. Even with short downtimes of the flotation cell particles from the suspension penetrate into the gas outlet openings and close them. When restarting the cell, the gas pressure of the gas to be introduced into the suspension is often insufficient to flush such small gas outlet openings of a gassing device freely again.

Umso wichtiger ist es daher, in die Suspension eingedüste Gasbläschen bereits an der Eindüsstelle daran zu hindern, sich zu großen Gasblasen zu verbinden.It is therefore all the more important to prevent gas bubbles injected into the suspension from already being at the injection point from connecting to large gas bubbles.

Die US 1,583,591 A und die GB 1272047 A beschreiben Anordnungen zur Begasung, die rotierend eingesetzt werden.The US 1,583,591 A and the GB 1272047 A describe fumigation arrangements that are used in rotation.

Es ist daher Aufgabe der Erfindung, eine dahingehend verbesserte Begasungseinrichtung bereitzustellen, die in der Lage ist, eingedüstes Gas besonders fein in der Suspension zu verteilen, und weiterhin eine Flotationszelle mit einer derartigen Begasungseinrichtung und ein Verfahren zu deren Betrieb anzugeben.It is therefore an object of the invention to provide a gassing device improved to that effect, which is able to disperse injected gas in a particularly fine manner in the suspension, and also to specify a flotation cell with such a gassing device and a method for its operation.

Die Aufgabe wird durch eine Begasungseinrichtung für eine Flotationszelle gelöst, umfassend ein Zentralgasrohr mit einer Zentralgasöffnung, an welches sich mindestens zwei Verbindungsrohre mit jeweils einer Verbindungsgasöffnung anschließen, wobei die Verbindungsrohre in einem rechten Winkel β zu einer Längsachse des Zentralgasrohrs ausgerichtet sind, wobei die Zentralgasöffnung mit den Verbindungsgas-öffnungen verbunden ist, und wobei ein jedes Verbindungsrohr an seinem dem Zentralgasrohr abgewandten Ende mit mindestens einer Gaseindüseeinheit verbunden ist, wobei jede Gaseindüseeinheit umfassend ein Gaszuführrohr mit einer Gaszuführöffnung und einen Gasverteiler mit einem Gasverteilerraum ausgebildet ist, in welchen die Gaszuführöffnung mündet, wobei der Gasverteiler weiterhin eine Anzahl an Gasverteilerdüsen mit jeweils mindestens einer rohrförmigen Düsenöffnung und mindestens einer Gasaustrittsöffnung umfasst, wobei eine jede Düsenöffnung einerseits mit dem Gasverteilerraum und andererseits mit mindestens einer Gasaustrittsöffnung an einem dem Gaszuführrohr abgewandten Ende der Gasverteilerdüse verbunden ist, wobei die Gasverteilerdüsen in Richtung einer Längsachse L1 des Gaszuführrohrs gesehen in einem gleichmäßigen Abstand voneinander um diese Längsachse L1 angeordnet sind und eine Längsachse L2, L2' einer jeden Düsenöffnung in einem Winkel α von kleiner als 90° zur Längsachse L1 des Gaszuführrohrs in Richtung des dem Gasverteiler abgewandten Endes des Gaszuführrohrs ausgerichtet ist, und wobei die Verbindungsgasöffnungen mit den Düsenöffnungen verbunden sind.The object is achieved by a gassing device for a flotation cell, comprising a central gas pipe with a central gas opening, to which connect at least two connecting pipes, each with a connecting gas opening, wherein the connecting pipes are aligned at a right angle β to a longitudinal axis of the central gas pipe, wherein the central gas opening with wherein each connecting pipe is connected at its end facing away from the central gas pipe with at least one gas injection unit, wherein each gas injection unit comprising a gas supply pipe with a gas supply opening and a gas distributor is formed with a gas distribution chamber into which opens the gas supply opening, wherein the gas distributor further comprises a number of gas distributor nozzles, each having at least one tubular nozzle opening and at least one gas outlet opening, wherein each nozzle opening connected on the one hand to the gas distributor space and on the other hand to at least one gas outlet opening at an end of the gas distributor nozzle facing away from the gas supply tube, the gas distributor nozzles being arranged at a uniform distance from one another about this longitudinal axis L1 in the direction of a longitudinal axis L1 of the gas supply tube and a longitudinal axis L2, L2 ' of each nozzle opening is oriented at an angle α of less than 90 ° to the longitudinal axis L1 of the gas supply pipe in the direction of the end of the gas supply pipe facing away from the gas distributor, and wherein the connecting gas openings are connected to the nozzle openings.

Die Anordnung der Gasaustrittsöffnungen der Gaseindüseeinheit ermöglicht es, dass ein Gas entgegen einer Bewegungsrichtung R einer Suspension in diese besonders fein verteilt eingedüst werden kann. Dadurch ist eine innige Vermischung von Suspension und Gasbläschen gewährleistet, so dass die Ausbeute einer Flotationszelle, die mit mindestens einer erfindungsgemäßen Begasungseinrichtung ausgestattet ist, deutlich erhöht wird.The arrangement of the gas outlet openings of the gas injection unit makes it possible for a gas to be sprayed into it in a particularly finely distributed manner against a direction of movement R of a suspension. As a result, an intimate mixing of suspension and gas bubbles is ensured, so that the yield of a flotation cell, which is equipped with at least one gassing device according to the invention, is significantly increased.

Dabei hat es sich bewährt, wenn die Längsachse L2, L2' einer jeden Düsenöffnung und die Längsachse L1 des Gaszuführrohrs in einem Winkel α im Bereich von 30° bis 70°, insbesondere in einem Winkel α von 45°, zueinander ausgerichtet sind.It has proven useful if the longitudinal axis L2, L2 'of each nozzle opening and the longitudinal axis L1 of the Gaszuführrohrs at an angle α in the range of 30 ° to 70 °, in particular at an angle α of 45 °, aligned with each other.

Dabei können pro Gasverteilerdüse die Längsachse L2, L2' der Düsenöffnung und die Längsachse L1 des Gaszuführrohrs in einer Ebene liegen. Bevorzugt sind die Längsachse L2, L2' einer jeden Düsenöffnung und die Längsachse L1 des Gaszuführrohrs zwar in einem Winkel α im Bereich von 30° bis 70°, insbesondere in einem Winkel α von 45°, zueinander ausgerichtet, jedoch nicht in einer Ebene angeordnet. Wird dabei ein Mittelpunkt der Querschnittsfläche einer der Düsenöffnungen am Übergang in den Gasverteilerraum fluchtend zur Längsachse L1 des Gaszuführrohrs betrachtet, liegt die Gasaustrittsöffnung seitlich der Längsachse L1 des Gaszuführrohrs, wobei die Längsachse L1 des Gaszuführrohrs und die Längsachse L2, L2' der Düsenöffnung in genau dieser Ansicht insbesondere einen Winkel γ im Bereich von > 0° bis 60° begrenzen. Durch eine derart verkippte Anordnung aller Düsenöffnungen einer Gaseindüseeinheit in gleicher Richtung wird dem aus der Gaseindüseeinheit ausströmenden Gas ein Drall aufgeprägt. Dieser bewirkt eine weitere Verbesserung der Durchmischung von Gas und Suspension.In this case, the longitudinal axis L2, L2 'of the nozzle opening and the longitudinal axis L1 of the gas supply tube can lie in one plane per gas distributor nozzle. Although the longitudinal axis L2, L2 'of each nozzle opening and the longitudinal axis L1 of the gas supply tube are preferably aligned at an angle α in the range of 30 ° to 70 °, in particular at an angle α of 45 °, they are not arranged in one plane. If a center point of the cross-sectional area of one of the nozzle openings at the transition into the gas distributor chamber is aligned with the longitudinal axis L1 of the gas supply pipe, the gas outlet opening lies laterally of the longitudinal axis L1 of the gas supply pipe, the longitudinal axis L1 of the gas supply pipe and the longitudinal axis L2, L2 ' The nozzle opening in exactly this view in particular an angle γ in the range of> 0 ° to 60 ° limit. By such a tilted arrangement of all the nozzle openings of a gas injection unit in the same direction, a swirl is imparted to the gas flowing out of the gas injection unit. This causes a further improvement of the mixing of gas and suspension.

Der Gasverteiler weist bevorzugt vier Gasverteilerdüsen auf. Dadurch wird das Gas intensiv in eine Suspension eingemischt. Es können aber auch lediglich zwei, drei oder mehr als vier Gasverteilerdüsen vorgesehen sein.The gas distributor preferably has four gas distributor nozzles. As a result, the gas is mixed thoroughly into a suspension. However, it is also possible to provide only two, three or more than four gas distributor nozzles.

Um ein Verstopfen der Gasaustrittsöffnungen durch Partikel aus der Suspension zu vermeiden, weist eine jede Gasaustrittsöffnung vorzugsweise einen Durchmesser im Bereich von 1 bis 5 mm auf. Je nachdem, welche Größe für die Gasaustrittsöffnungen gewählt wird, sind über die gesamte Höhe der Flotationskammer in der Suspension ausschließlich Gasbläschen mit einem Durchmesser im Bereich von 1 bis 5 mm vorhanden, die eine optimale Abtrennung der Wertstoffpartikel und eine hohe Ausbeute ermöglichen.In order to avoid clogging of the gas outlet openings by particles from the suspension, each gas outlet opening preferably has a diameter in the range of 1 to 5 mm. Depending on which size is selected for the gas outlet openings, exclusively gas bubbles with a diameter in the range of 1 to 5 mm are present over the entire height of the flotation chamber in the suspension, which allow optimal separation of the valuable material particles and a high yield.

Erfindungsgemäß weist die Begasungseinrichtung das Zentralgasrohr mit einer Zentralgasöffnung auf, an welches sich mindestens zwei Verbindungsrohre mit jeweils einer Verbindungsgasöffnung anschließen, wobei die Verbindungsrohre in einem rechten Winkel β zu einer Längsachse LZ des Zentralgasrohrs ausgerichtet sind, wobei die Zentralgasöffnung mit den Verbindungsgasöffnungen verbunden ist, und wobei ein jedes Verbindungsrohr an seinem dem Zentralgasrohr abgewandten Ende mit mindestens einer Gaseindüseeinheit verbunden ist, wobei die Verbindungsgasöffnungen mit den Düsenöffnungen verbunden sind. Dies ermöglicht ein Einsetzen der Begasungseinrichtung in eine Flotationskammer, ohne dass eine Befestigung im Bereich des Gehäuses der Flotationszelle erfolgen muss.According to the invention, the gassing device has the central gas pipe with a central gas opening, to which at least two connecting pipes each having a connecting gas opening connect, wherein the connecting pipes are aligned at a right angle β to a longitudinal axis LZ of the central gas pipe, the central gas opening being connected to the connecting gas openings, and wherein each connecting pipe is connected at its end facing away from the central gas pipe with at least one gas injection unit, wherein the connecting gas openings are connected to the nozzle openings. This allows the gassing device to be inserted into a flotation chamber without having to be fastened in the region of the housing of the flotation cell.

Vorzugsweise sind je zwei Verbindungsrohre symmetrisch zur Längsachse LZ des Zentralgasrohrs einander gegenüberliegend am Zentralgasrohr angeordnet. Diese symmetrische Ausführungsform stabilisiert die gewünschte Position der Gaseindüseeinheiten in der Flotationskammer.Preferably, two connecting tubes are arranged symmetrically to the longitudinal axis LZ of the central gas pipe opposite each other on the central gas pipe. This symmetrical embodiment stabilizes the desired position of the gas injector units in the flotation chamber.

Die Längsachse L1 eines Gaszuführrohrs ist bevorzugt derart in einem Winkel, insbesondere rechtem Winkel, zu einer Längsachse LV des jeweiligen Verbindungsrohrs ausgerichtet, dass eine Eindüsung von Gas über die Gasaustrittsöffnungen entgegen der Bewegungsrichtung R der Suspension in der Flotationskammer erreicht wird.The longitudinal axis L1 of a gas feed tube is preferably aligned at an angle, in particular a right angle, to a longitudinal axis LV of the respective connecting tube such that an injection of gas via the gas outlet openings is achieved against the direction of movement R of the suspension in the flotation chamber.

Vorzugsweise ist eine Gaseindüseeinheit dabei verschwenkbar an einem Verbindungsrohr befestigt, um eine schnelle und unkomplizierte Anpassung und Optimierung der Position der Gasaustrittsöffnungen entgegen der aktuellen Bewegungsrichtung R der Suspension in einer Flotationskammer zu gewährleisten. Dies kann durch ein in einer gewählten Position feststellbares Gelenk, das zwischen Verbindungsrohr und Gaseindüseeinheit angeordnet ist, und dergleichen realisiert sein.Preferably, a gas injector unit is pivotally attached to a connecting pipe to ensure a quick and easy adjustment and optimization of the position of the gas outlet openings against the current direction of movement R of the suspension in a flotation chamber. This can be realized by a fixable in a selected position joint, which is arranged between the connecting pipe and the gas injection unit, and the like.

Die Aufgabe wird für die Flotationszelle, insbesondere eine säulenartige Flotationszelle oder Hybridflotationszelle, umfassend ein Gehäuse mit einer Flotationskammer, mindestens eine Düsenanordnung zur Zuführung von Gas und einer Suspension in die Flotationskammer sowie mindestens einer erfindungsgemäßen Begasungseinrichtung zur weiteren Zuführung von Gas in die Flotationskammer gelöst, indem jede Gaseindüseeinheit in der Flotationskammer unterhalb der mindestens einen Düsenanordnung angeordnet ist.The object is achieved for the flotation cell, in particular a columnar flotation cell or hybrid flotation cell, comprising a housing with a flotation chamber, at least one nozzle arrangement for supplying gas and a suspension in the flotation and at least one gasification device according to the invention for further supply of gas into the flotation by each gas injector unit is disposed in the flotation chamber below the at least one nozzle assembly.

Zumindest ein Teil der Gasaustrittsöffnungen wird entgegen einer lokalen Bewegungsrichtung R der Suspension im Gehäuse ausgerichtet, wobei die Längsachsen L1 der Gaszuführrohre in einem Winkel von 0° bis maximal 90° zur lokalen Bewegungsrichtung R der Suspension im Gehäuse ausgerichtet werden.At least part of the gas outlet openings is aligned counter to a local direction of movement R of the suspension in the housing, wherein the longitudinal axes L1 of the gas supply pipes are aligned at an angle of 0 ° to a maximum of 90 ° to the local direction of movement R of the suspension in the housing.

Die erfindungsgemäße Flotationszelle gewährleistet eine hohe Trennleistung und damit Ausbeute an Wertstoffpartikeln, da mittels der mindestens einen Begasungseinrichtung die Einstellung geeigneter Durchmesser der Gasbläschen in der gesamten Flotationskammer sowie eine besonders innige Vermischung der erzeugten Gasbläschen mit der Suspension erreicht werden kann.The flotation cell according to the invention ensures a high separation efficiency and thus a yield of valuable material particles, since the setting of suitable diameters of the gas bubbles in the entire flotation chamber and a particularly intimate mixing of the gas bubbles produced with the suspension can be achieved by means of the at least one gasification device.

Bei der Flotationszelle handelt es sich bevorzugt um eine säulenartige Flotationszelle, bei welcher ein Durchmesser der Flotationskammer um ein Vielfaches geringer ist als deren Höhe. Insbesondere handelt es sich um eine Hybridflotationszelle, welche durch eine säulenartige Flotationszelle kombiniert mit einer pneumatischen Flotationszelle gebildet ist. Dem Effekt einer Bildung von Gasblasen mit übermäßigem Durchmesser, der hier aufgrund der säulenartigen Bauweise dieser Flotationszellen verstärkt gegeben ist, wird mittels der erfindungsgemäßen Begasungseinrichtung entgegen gewirkt. Bereits bestehende Flotationszellen können in einfacher Weise mit mindestens einer erfindungsgemäßen Begasungseinrichtung ausgerüstet werden und dadurch deren Leistungsfähigkeit erhöht werden.The flotation cell is preferably a columnar flotation cell in which a diameter of the flotation chamber is many times smaller than its height. In particular, it is a hybrid flotation cell formed by a columnar flotation cell combined with a pneumatic flotation cell. The effect of formation of gas bubbles of excessive diameter, which is reinforced here due to the columnar construction of these flotation cells, is counteracted by means of the gassing device according to the invention. Already existing flotation cells can be equipped in a simple manner with at least one gassing device according to the invention and thereby their performance can be increased.

Das Gehäuse der Flotationszelle weist in einer bevorzugten Ausführungsform einen zylindrischen Gehäuseabschnitt auf, dessen Symmetrieachse vertikal angeordnet ist.The housing of the flotation cell has, in a preferred embodiment, a cylindrical housing section whose axis of symmetry is arranged vertically.

Das Zentralgasrohr wird bevorzugt senkrecht und die Verbindungsrohre werden bevorzugt horizontal in der Flotationskammer angeordnet. So ist eine Höhenverstellung der Position der Gaseindüseeinheiten innerhalb der Flotationskammer schnell und problemlos möglich.The central gas pipe is preferably vertical and the connecting pipes are preferably arranged horizontally in the flotation chamber. Thus, a height adjustment of the position of the gas injection units within the flotation is possible quickly and easily.

Die Längsachsen L1 der Gaszuführrohre werden bevorzugt in einem Winkel im Bereich von 0° bis 20° zur lokalen Bewegungsrichtung R der Suspension im Gehäuse dieser entgegengerichtet angeordnet, um die Vermengung von Gasbläschen und Suspension zu intensivieren.The longitudinal axes L1 of the gas supply pipes are preferably arranged at an angle in the range of 0 ° to 20 ° to the local direction of movement R of the suspension in the housing in the opposite direction, in order to intensify the mixing of gas bubbles and suspension.

Diese Maßnahme(n) führen zu einer guten Verteilung des Gases und einer intensiven Durchmischung von Gas und Suspension in einer Flotationszelle.This measure (s) lead to a good distribution of the gas and an intensive mixing of gas and suspension in a flotation cell.

Als Gas, das bei einer pneumatischen Flotationszelle mittels der Begasungseinrichtung und/oder der Düsenanordnung in eine Flotationskammer eingebracht wird, wird bevorzugt Luft oder Stickstoff eingesetzt.As gas which is introduced into a flotation chamber in a pneumatic flotation cell by means of the gassing device and / or the nozzle arrangement, preference is given to using air or nitrogen.

Die Aufgabe wird weiterhin für das Verfahren zur Flotation von Wertstoffpartikeln, insbesondere Erzmineralen, aus einer Suspension mit einem Feststoffgehalt im Bereich von 30 bis 40 % unter Ausbildung eines Schaumprodukts mittels einer erfindungsgemäßen Flotationszelle gelöst.The object is further achieved for the process for flotation of valuable particles, in particular ore minerals, from a suspension having a solids content in the range of 30 to 40% to form a foam product by means of a flotation cell according to the invention.

Die Figuren 1 bis 7 sollen beispielhaft erfindungsgemäße Begasungseinrichtungen, eine Flotationszelle und deren Funktionsweise erläutern. So zeigt

FIG 1
eine Gaseindüseeinheit der Begasungs-einrichtung gemäß FIG 5 in der Vorderansicht;
FIG 2
die Gaseindüseeinheit der Begasungseinrichtung gemäß FIG 5 im Längsschnitt;
FIG 3
eine weitere Gaseindüseeinheit im Längsschnitt;
FIG 4
die weitere Gaseindüseeinheit im Querschnitt von oben;
FIG 5
eine Begasungseinrichtung in dreidimensionaler Ansicht;
FIG 6
schematisch eine pneumatische Flotationszelle im Teil-Längsschnitt; und
FIG 7
eine Draufsicht auf die pneumatische Flotationszelle gemäß FIG 6.
The FIGS. 1 to 7 For example, gassing devices according to the invention, a flotation cell and their mode of operation will be explained. So shows
FIG. 1
a gas injection unit of the gassing according to FIG. 5 in front view;
FIG. 2
the gas injection unit of the gassing according to FIG. 5 in longitudinal section;
FIG. 3
a further gas injection unit in longitudinal section;
FIG. 4
the further gas injection unit in cross section from above;
FIG. 5
a gassing device in three-dimensional view;
FIG. 6
schematically a pneumatic flotation cell in partial longitudinal section; and
FIG. 7
a plan view of the pneumatic flotation cell according to FIG. 6 ,

FIG 1 zeigt einen Teil 1 einer Begasungseinrichtung 1" gemäß FIG 5 in der Vorderansicht. FIG 2 zeigt den Teil 1 der Begasungseinrichtung 1" gemäß FIG 5 in einem Längsschnitt. Die Gaseindüseeinheit 2 umfasst ein Gaszuführrohr 2a mit einer Gaszuführöffnung 2a' und einen Gasverteiler 2b mit einem Gasverteilerraum 2b', in welchen die Gaszuführöffnung 2a' mündet. Der Gasverteiler 2b umfasst weiterhin vier Gasverteilerdüsen 2c mit jeweils einer rohrförmigen Düsenöffnung 2c' und einer Gasaustrittsöffnung 2d, wobei eine jede Düsenöffnung 2c' einerseits mit dem Gasverteilerraum 2b' und andererseits mit einer Gasaustrittsöffnung 2d an einem dem Gaszuführrohr 2a abgewandten Ende der Gasverteilerdüse 2c verbunden ist. Insgesamt sind hier vier Gasverteilerdüsen 2c vorhanden, die in Richtung der Längsachse L1 des Gaszuführrohrs 2a gesehen in gleichmäßigem Abstand zueinander um diese gruppiert sind. Je zwei Gasverteilerdüsen 2c sind symmetrisch zur Längsachse L1 des Gaszuführrohrs 2a einander gegenüberliegend angeordnet. Eine Längsachse L2, L2' einer jeden Düsenöffnung 2c' ist in einem Winkel α von 45° zur Längsachse L1 des Gaszuführrohrs 2a in Richtung des dem Gasverteiler 2b abgewandten Endes des Gaszuführrohrs 2a ausgerichtet. Ein in das Gaszuführrohr 2a einströmendes Gas 7 durchströmt die Gaszuführöffnung 2a', gelangt in dem Gasverteilerraum 2b' und anschließend in die Düsenöffnungen 2c', um schließlich über die Gasaustrittsöffnungen 2d auszuströmen. Beim Einsatz der Begasungseinrichtung 1" gemäß FIG 5 in einer Flotationszelle wird Gas 7 fein verteilt in eine zu flotierende Suspension eingedüst. FIG. 1 shows a part 1 of a gassing device 1 "according to FIG. 5 in the front view. FIG. 2 shows the part 1 of the gassing device 1 "according to FIG. 5 in a longitudinal section. The gas injection unit 2 includes a gas supply pipe 2a having a gas supply opening 2a 'and a gas distributor 2b having a gas distribution space 2b ', in which the gas supply opening 2a' opens. The gas distributor 2b further comprises four gas distributor nozzles 2c each having a tubular nozzle opening 2c 'and a gas outlet opening 2d, wherein each nozzle opening 2c' is connected on the one hand to the gas distributor chamber 2b 'and on the other hand to a gas outlet opening 2d on an end of the gas distributor nozzle 2c remote from the gas supply pipe 2a , In total, four gas distributor nozzles 2c are present here, which are grouped around the same in the direction of the longitudinal axis L1 of the gas supply pipe 2a, at a uniform distance from one another. Each two gas distributor nozzles 2c are arranged opposite one another symmetrically with respect to the longitudinal axis L1 of the gas supply pipe 2a. A longitudinal axis L2, L2 'of each nozzle opening 2c' is oriented at an angle α of 45 ° to the longitudinal axis L1 of the gas supply pipe 2a in the direction of the end of the gas supply pipe 2a facing away from the gas distributor 2b. A gas 7 flowing into the gas supply pipe 2a flows through the gas supply opening 2a ', passes into the gas distribution space 2b' and then into the nozzle openings 2c 'to finally discharge via the gas outlet openings 2d. When using the gassing device 1 "according to FIG. 5 In a flotation cell, gas 7 is injected in a finely divided manner into a suspension to be floated.

FIG 3 zeigt einen Teil 1' in Form einer weiteren Gaseindüseeinheit 2 einer weiteren Begasungseinrichtung in einem Längsschnitt, die eine besonders robuste Ausführungsform aufweist. Gleiche Bezugszeichen wie in den FIGen 1 und 2 bezeichnen gleiche Elemente. Die Gaseindüseeinheit 2 umfasst ebenfalls ein Gaszuführrohr 2a mit einer Gaszuführöffnung 2a' und einen Gasverteiler 2b mit einem Gasverteilerraum 2b', in welchen die Gaszuführöffnung 2a' mündet. Das Gaszuführrohr 2a ist hier allerdings einseitig verschlossen. Der Gasverteiler 2b umfasst hier vier in das geschlossene Ende des Gaszuführrohrs 2a integrierte Gasverteilerdüsen 2c mit jeweils einer rohrförmigen Düsenöffnung 2c' und einer Gasaustrittsöffnung 2d, wobei eine jede Düsenöffnung 2c' einerseits mit dem Gasverteilerraum 2b' und andererseits mit einer Gasaustrittsöffnung 2d an einem dem Gaszuführrohr 2a abgewandten Ende der Gasverteilerdüse 2b verbunden ist. FIG. 3 shows a part 1 'in the form of a further gas injection unit 2 of a further gassing device in a longitudinal section, which has a particularly robust embodiment. The same reference numerals as in FIGS. 1 and 2 denote the same elements. The gas injection unit 2 also includes a gas supply pipe 2a having a gas supply port 2a 'and a gas distributor 2b having a gas distribution chamber 2b' into which the gas supply port 2a 'opens. However, the gas supply pipe 2a is here closed on one side. The gas distributor 2b here comprises four gas distributor nozzles 2c integrated in the closed end of the gas supply tube 2a, each having a tubular nozzle opening 2c 'and a gas outlet opening 2d, wherein each nozzle opening 2c' on the one hand with the gas distributor chamber 2b 'and on the other hand with a gas outlet opening 2d is connected to an end of the gas distributor nozzle 2b facing away from the gas supply pipe 2a.

In einer alternativen Ausführungsform kann hier auch ein spitz zulaufendes Gaszuführrohr 2a eingesetzt und auf dessen Spitze eine Kappe aufgesetzt und befestigt werden, wobei der Gasverteilerraum 2b', die Gasverteilerdüsen 2c mit den Düsenöffnungen 2c' sowie die Gasaustrittsöffnungen 2d sich aufgrund der Kontur der Spitze und der Kontur der, der Spitze zugewandten Seite der Kappe ergeben.In an alternative embodiment, a tapered gas feed tube 2a can be used here and mounted on the top of a cap and secured, wherein the gas distribution chamber 2b ', the gas distributor nozzles 2c with the nozzle openings 2c' and the gas outlet openings 2d due to the contour of the tip and the Contour of the, the tip-facing side of the cap arise.

Die Längsachse L2, L2' einer jeden Düsenöffnung 2c' und die Längsachse L1 des Gaszuführrohrs 2a sind, wie in den FIGen 1 und 2 gezeigt, in einem Winkel α von 45° zueinander ausgerichtet, jedoch nicht in einer Ebene angeordnet. Wird ein Mittelpunkt der Querschnittsfläche einer der Düsenöffnungen 2c am Übergang in den Gasverteilerraum 2b' fluchtend zur Längsachse L1 des Gaszuführrohrs 2a betrachtet, liegt die zugehörige Gasaustrittsöffnung 2d seitlich der Längsachse L1 des Gaszuführrohrs 2a , wobei die Längsachse L1 des Gaszuführrohrs 2a und die Längsachse L2, L2' der Düsenöffnung 2c in genau dieser Ansicht einen Winkel γ im Bereich von > 0° bis 60° begrenzen. Durch die derart verkippte Anordnung aller Düsenöffnungen 2c' der Gaseindüseeinheit 2 in gleicher Richtung wird einem aus der Gaseindüseeinheit 2 ausströmenden Gas 7 ein Drall aufgeprägt. Dieser bewirkt eine weitere Verbesserung der Durchmischung von Gas 7 und Suspension. Auch die Gasverteilerdüsen 2c gemäß der in den FIGen 1 und 2 gezeigten Ausführungsform können derart verkippt angeordnet werden.The longitudinal axis L2, L2 'of each nozzle opening 2c' and the longitudinal axis L1 of the gas supply pipe 2a, as shown in Figures 1 and 2, at an angle α of 45 ° aligned with each other, but not arranged in a plane. If a center point of the cross-sectional area of one of the nozzle openings 2c at the transition into the gas distributor space 2b 'is aligned with the longitudinal axis L1 of the gas supply pipe 2a, the associated gas outlet opening 2d lies laterally of the longitudinal axis L1 of the gas supply pipe 2a, the longitudinal axis L1 of the gas supply pipe 2a and the longitudinal axis L2, L2 'of the nozzle opening 2c in exactly this view define an angle γ in the range of> 0 ° to 60 °. As a result of the arrangement of all the nozzle openings 2c 'of the gas injection unit 2 in the same direction, which is tilted in this way, a swirl is imparted to a gas 7 flowing out of the gas injection unit 2. This causes a further improvement of the mixing of gas 7 and suspension. The gas distributor nozzles 2c according to the embodiment shown in FIGS. 1 and 2 can also be arranged tilted in this way.

FIG 4 zeigt die weitere Gaseindüseeinheit 2 gemäß FIG 3 im Querschnitt von oben, wobei die Anordnung und Ausrichtung der Gasverteilerdüsen 2c deutlicher erkennbar ist. FIG. 4 shows the further gas injection unit 2 according to FIG. 3 in cross-section from above, wherein the arrangement and orientation of the gas distributor nozzles 2c is clearly visible.

FIG 5 zeigt eine Begasungseinrichtung 1" in dreidimensionaler Ansicht. Die Begasungseinrichtung 1" umfasst ein Zentralgasrohr 3 mit einer Zentralgasöffnung 3a, an welches sich hier vier Verbindungsrohre 4a, 4b, 4c, 4d mit jeweils einer Verbindungsgasöffnung 4a', 4b', 4c', 4d' anschließen. Dabei sind die Verbindungsrohre 4a, 4b, 4c, 4d in einem rechten Winkel β zur Längsachse LZ des Zentralgasrohrs 3 ausgerichtet. Die Zentralgasöffnung 3a ist mit den Verbindungsgasöffnungen 4a', 4b', 4c', 4d' verbunden, wobei ein jedes Verbindungsrohr 4a, 4b, 4c, 4d an seinem dem Zentralgasrohr 3 abgewandten Ende mit je einer Gaseindüseeinheit 2 (vergleiche FIGen 1 und 2) verbunden ist, und wobei die Verbindungsgasöffnungen 4a', 4b', 4c', 4d' mit den Düsenöffnungen 2c' verbunden sind. Die Gaseindüseeinheiten 2 können dabei am Verbindungsrohr 4a, 4b, 4c, 4d verschwenkbar befestigt sein (siehe Pfeile), so dass eine optimale räumliche Ausrichtung und schnelle Anpassung der Positionierung der Gasaustrittsöffnungen 2d im Hinblick auf die in einer Flotationszelle vorhandene spiralförmige Bewegungsrichtung R der Suspension im Bereich der Gasaustrittsöffnungen 2d möglich ist. Die Gaseindüseeinheiten 2 sind dabei bevorzugt gegenüber der Ebene, in der sich die Verteilerrohre befinden, in einem Winkel von etwa 20 bis 30° nach oben ausgerichtet, sofern sich die Suspension spiralförmig von oben nach unten in der Flotationskammer 120 (vergleiche FIG 5) bewegt. FIG. 5 shows a gassing device 1 "in a three-dimensional view The gassing device 1" comprises a central gas pipe 3 with a central gas opening 3a, to which here four connecting pipes 4a, 4b, 4c, 4d, each with a Connecting gas opening 4a ', 4b', 4c ', 4d' connect. In this case, the connecting pipes 4a, 4b, 4c, 4d are aligned at a right angle β to the longitudinal axis LZ of the central gas pipe 3. The central gas opening 3a is connected to the connecting gas openings 4a ', 4b', 4c ', 4d', wherein each connecting pipe 4a, 4b, 4c, 4d at its end facing away from the central gas pipe 3, each with a gas injection unit 2 (see FIGS. 1 and 2) is connected, and wherein the connecting gas openings 4a ', 4b', 4c ', 4d' are connected to the nozzle openings 2c '. The gas injection units 2 can be pivotally mounted on the connecting pipe 4a, 4b, 4c, 4d (see arrows), so that an optimal spatial orientation and rapid adjustment of the positioning of the gas outlet openings 2d with respect to the present in a flotation cell spiraling direction R of the suspension in Area of the gas outlet openings 2d is possible. The gas injection units 2 are preferably aligned with respect to the plane in which the distribution pipes are at an angle of about 20 to 30 ° upwards, provided that the suspension spiral from top to bottom in the flotation 120 (see FIG. 5 ) emotional.

FIG 6 zeigt eine säulenartige Flotationszelle 100, hier eine Hybridflotationszelle, mit einem Gehäuse 110, das eine Flotationskammer 120 umfasst. Die linke Seite der Flotationszelle 100 ist in Vorderansicht, die rechte Seite im Schnitt dargestellt. Innerhalb der Flotationskammer 120 befindet sich eine Schaumrinne 130 mit Stutzen 131 zum Austragen des gebildeten Schaumproduktes. Die Flotationskammer 120 ist mit Düsenanordnungen 140 zur Zuführung eines Gemisches 8 aus Gas, insbesondere Luft, und einer Suspension umfassend abzutrennende Wertstoffpartikel in die Flotationskammer 120 ausgestattet. Die Suspension weist hier einen hohen Feststoffgehalt im Bereich von 30 bis 40 % auf. FIG. 6 FIG. 2 shows a columnar flotation cell 100, here a hybrid flotation cell, with a housing 110 that includes a flotation chamber 120. The left side of the flotation cell 100 is shown in front view, the right side in section. Within the flotation chamber 120 is a foam channel 130 with nozzle 131 for discharging the foam product formed. The flotation chamber 120 is equipped with nozzle arrangements 140 for supplying a mixture 8 of gas, in particular air, and a suspension comprising recyclable material particles to be separated into the flotation chamber 120. The suspension here has a high solids content in the range of 30 to 40%.

Das Gehäuse 110 weist einen zylindrischen Gehäuseabschnitt 110a auf, in dessen Zentrum die Begasungsanordnungen 1" gemäß FIG 5 eingesetzt ist. Das Gehäuse 110 weist weiterhin eine Bodenaustragsöffnung 150 auf. Die Oberkante der Außenwandung des Gehäuses 110 befindet sich oberhalb der Oberkante der Schaumrinne 130, wodurch ein Überlauf des gebildeten Schaumproduktes über die Oberkante des Gehäuses 110 ausgeschlossen ist. Partikel der Suspension, die beispielsweise mit einer nicht ausreichend hydrophobierten Oberfläche versehen sind oder nicht mit einem Gasbläschen kollidiert sind sowie hydrophile Partikel sinken in Richtung der Bodenaustragsöffnung 150 ab und werden über diese ausgetragen. Mittels der Begasungseinrichtung 1" wird in den zylindrischen Gehäuseabschnitt 110a zusätzliches Gas 7, insbesondere Luft, eingeblasen, so dass weitere hydrophobe Partikel daran gebunden werden und aufsteigen.The housing 110 has a cylindrical housing section 110a, in the center of which the gassing arrangements 1 "according to FIG FIG. 5 is used. The housing 110 also has a Floor discharge opening 150 on. The upper edge of the outer wall of the housing 110 is located above the upper edge of the foam channel 130, whereby an overflow of the foam product formed over the upper edge of the housing 110 is excluded. Particles of the suspension, which are provided, for example, with an insufficiently hydrophobized surface or have not collided with a gas bubble, and hydrophilic particles sink in the direction of the bottom discharge opening 150 and are discharged via this. By means of the gassing device 1 ", additional gas 7, in particular air, is blown into the cylindrical housing section 110a, so that further hydrophobic particles are bound thereto and rise.

Die Ausrichtung zumindest einiger der Gasaustrittsöffnungen 2d der jeweiligen Gaseindüseeinheiten 2 derart, dass das Gas 7 entgegen der spiralförmigen Bewegungsrichtung R der Suspension eingedüst wird, gewährleistet eine innige Vermischung von Suspension und Gasbläschen, so dass die Ausbeute der Flotationszelle 100 erhöht wird. Die Position der Gaseindüseeinheiten 2 kann dabei in Richtung der Längsachse LZ des Zentralrohrs 3 nach oben oder unten verändert und dabei optimiert werden.The orientation of at least some of the gas outlet openings 2d of the respective gas injection units 2 in such a way that the gas 7 is injected counter to the spiraling direction of movement R of the suspension ensures intimate mixing of suspension and gas bubbles, so that the yield of the flotation cell 100 is increased. The position of the gas injection units 2 can be changed in the direction of the longitudinal axis LZ of the central tube 3 up or down and thereby optimized.

Im Idealfall sinken vor allem die hydrophilen Partikel weiter ab und werden über die Bodenaustragsöffnung 150 ausgetragen. Das Schaumprodukt enthaltend die Wertstoffpartikel gelangt aus der Flotationskammer 120 in die Schaumrinne 130 und wird über die Stutzen 131 abgeführt und gegebenenfalls eingedickt.Ideally, especially the hydrophilic particles continue to sink and are discharged via the bottom discharge opening 150. The foam product containing the valuable material particles passes from the flotation chamber 120 into the foam channel 130 and is discharged via the nozzles 131 and optionally thickened.

FIG 7 zeigt die Flotationszelle 100 in der Draufsicht, wobei die Lage der Begasungseinrichtung 1" in der Flotationskammer 120 ersichtlich ist. FIG. 7 shows the flotation cell 100 in the plan view, wherein the position of the gassing device 1 "in the flotation chamber 120 can be seen.

In der Flotationszelle 100 wird idealerweise eine Suspension mit einem Feststoffgehalt im Bereich von 30 bis 40 % umfassend Partikel mit einem maximalen Partikeldurchmesser flotiert. Der Durchmesser der Gasaustrittsöffnungen 2d liegt dabei im Bereich von 1 bis 5 mm.In the flotation cell 100, ideally, a suspension having a solids content in the range from 30 to 40% comprising particles having a maximum particle diameter is floated. The diameter of the gas outlet openings 2d is in the range of 1 to 5 mm.

Die in den Figuren dargestellten Begasungseinrichtungen und Flotationszellen stellen dabei lediglich Beispiele aus einer Vielzahl an weiteren möglichen Ausgestaltungen von erfindungsgemäßen Begasungseinrichtungen und damit versehenen Flotationszellen dar. Ein Fachmann kann auch andere Flotationszellen mit einer oder einer geeigneten Anzahl an erfindungsgemäßen Begasungseinrichtungen ausstatten.The gassing devices and flotation cells illustrated in the figures merely represent examples of a multiplicity of further possible embodiments of gassing devices according to the invention and of flotation cells provided therewith. A person skilled in the art can also equip other flotation cells with one or a suitable number of gassing devices according to the invention.

So können Gaseindüseeinheiten1, 1' gemäß den FIGen 1 bis 4 derart in der Flotationskammer 120 angeordnet werden, dass das Gaszuführrohr 2a am zylindrischen Gehäuseabschnitt 110a befestigt wird und die Zufuhr von Gas 7 durch den zylindrischen Gehäuseabschnitt 110a hindurch erfolgt. Auch können sich für den Einsatz einer erfindungsgemäßen Begasungseinrichtung geeignete Flotationszellen hinsichtlich der Ausgestaltung und Anordnung der Flotationskammer, des Schaumsammlers, der Anzahl an Düsenanordnungen zum Eindüsen von Suspension und Gas usw. unterscheiden, ohne den Grundgedanken der Erfindung zu verlassen. Weiterhin können die Begasungseinrichtungen eine andere Anzahl an Gasverteilerdüsen, Düsenöffnungen, Gasaustrittsöffnungen, Verbindungsrohren und dergleichen aufweisen, wobei deren Anordnung und Ausrichtung zueinander variieren kann.Thus, gas injector units 1, 1 'according to FIGS. 1 to 4 can be arranged in the flotation chamber 120 in such a way that the gas supply tube 2a is fastened to the cylindrical housing section 110a and the supply of gas 7 takes place through the cylindrical housing section 110a. Also suitable for the use of a gassing device according to the invention suitable flotation cells with regard to the design and arrangement of the flotation, the foam collector, the number of nozzle arrangements for injecting suspension and gas, etc., without departing from the spirit of the invention. Furthermore, the gassing devices may have a different number of gas distributor nozzles, nozzle openings, gas outlet openings, connecting pipes and the like, their arrangement and orientation being able to vary from one another.

Claims (11)

  1. Sparging device (1") for a flotation cell (100), the device comprising a central gas conduit (3) having a central gas orifice (3a) to which are connected at least two connecting tubes (4a, 4b, 4c, 4d), each having a connecting gas orifice (4a', 4b', 4c', 4d'), wherein the connecting tubes (4a, 4b, 4c, 4d) are aligned at a right angle β to a longitudinal axis LZ of the central gas conduit (3), wherein the central gas orifice (3a) is connected to the connecting gas orifices (4a', 4b', 4c', 4d'), and wherein at its end facing away from the central gas conduit (3) each connecting tube (4a, 4b, 4c, 4d) is connected to at least one gas injection unit (2), wherein each gas injection unit (2) comprising a gas feed tube (2a) having a gas feed orifice (2a') and a gas distributor (2b) is embodied with a gas distributor chamber (2b') into which the gas feed orifice (2a') leads, wherein the gas distributor (2b) additionally comprises a number of gas distributor nozzles (2c), each having at least one tubular nozzle orifice (2c') and at least one gas outlet orifice (2d), wherein each nozzle orifice (2c') is connected on one side to the gas distributor chamber (2b') and on the other side to at least one gas outlet orifice (2d) at an end of the gas distributor nozzle (2c) facing away from the gas feed tube (2a), wherein the gas distributor nozzles (2c) are arranged equidistantly from one another around a longitudinal axis L1 of the gas feed tube (2a), viewed in the direction of said longitudinal axis L1, and a longitudinal axis L2, L2' of each nozzle orifice (2c') is aligned at an angle α of less than 90° to the longitudinal axis L1 of the gas feed tube (2a) in the direction of the end of the gas feed tube (2a) facing away from the gas distributor (2b), and wherein the connecting gas orifices (4a', 4b', 4c', 4d') are connected to the nozzle orifices (2c').
  2. Sparging device according to claim 1,
    wherein the longitudinal axis L2, L2' of each nozzle orifice (2c') is aligned at an angle α in the range of 30° to 70° to the longitudinal axis L1 of the gas feed tube (2a).
  3. Sparging device according to claim 2,
    wherein for each gas distributor nozzle (2c) the longitudinal axis L2, L2' of the nozzle orifice (2c') and the longitudinal axis L1 of the gas feed tube (2a) are arranged in one plane.
  4. Sparging device according to one of claims 1 to 3,
    wherein each gas outlet orifice (2d) has a diameter in the range of 1 to 5 mm.
  5. Sparging device according to one of claims 1 to 4, wherein two connecting tubes (4a, 4c; 4b, 4d) in each case are arranged opposite each other at the central gas conduit (3) and symmetrically with respect to the longitudinal axis LZ of the central gas conduit (3).
  6. Sparging device according to one of claims 1 to 5,
    wherein the longitudinal axis (L1) of each gas feed tube (2a) is aligned at an angle, in particular a right angle, to a longitudinal axis LV of the respective connecting tube (4a, 4b, 4c, 4d).
  7. Flotation cell (100), comprising a housing (110) having a flotation chamber (120), at least one nozzle arrangement (140) for feeding gas and a suspension into the flotation chamber (120), and at least one sparging device (1") according to one of claims 1 to 6 for further feeding of gas into the flotation chamber (120), wherein each gas injection unit (2) is arranged in the flotation chamber (120) underneath the at least one nozzle arrangement (140).
  8. Flotation cell according to claim 7, which is embodied as a column-shaped flotation cell or hybrid flotation cell.
  9. Flotation cell according to claim 7 or claim 8,
    wherein the central gas conduit (3) is arranged vertically and the connecting tubes (4a, 4b, 4c, 4d) are arranged horizontally in the flotation chamber (120).
  10. Method for separating valuable resource particles, in particular ore minerals, by flotation from a suspension having a solid matter content in the range of 30 to 40 % while forming a foam product by means of a flotation cell (100) according to one of claims 7 to 9, wherein at least some of the gas outlet orifices (2d) are aligned counter to a local direction of movement R of the suspension in the housing (110), wherein the longitudinal axes (L1) of the gas feed tubes (2a) are aligned at an angle of 0° to max. 90° to the local direction of movement R of the suspension in the housing (110) .
  11. Method according to claim 10,
    wherein the longitudinal axes L1 of the gas feed tubes (2a) are arranged at an angle in the range of 0° to 20° to the local direction of movement R of the suspension in the housing (110) and oppositely directed thereto.
EP10171860.9A 2010-08-04 2010-08-04 Aeration device for a flotation cell, flotation cell and flotation method Not-in-force EP2415527B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP10171860.9A EP2415527B1 (en) 2010-08-04 2010-08-04 Aeration device for a flotation cell, flotation cell and flotation method
DK10171860.9T DK2415527T3 (en) 2010-08-04 2010-08-04 Gassing device for a flotation cell, flotation cell and flotation method
PL10171860T PL2415527T3 (en) 2010-08-04 2010-08-04 Aeration device for a flotation cell, flotation cell and flotation method
PCT/EP2011/056223 WO2012016721A1 (en) 2010-08-04 2011-04-19 Sparging device for a flotation cell
PE2013000194A PE20131056A1 (en) 2010-08-04 2011-04-19 GAS INTRODUCTION DEVICE FOR A FLOAT CELL
AU2011287891A AU2011287891B2 (en) 2010-08-04 2011-04-19 Sparging device for a flotation cell
US13/814,050 US8794446B2 (en) 2010-08-04 2011-04-19 Sparging device for a flotation cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10171860.9A EP2415527B1 (en) 2010-08-04 2010-08-04 Aeration device for a flotation cell, flotation cell and flotation method

Publications (2)

Publication Number Publication Date
EP2415527A1 EP2415527A1 (en) 2012-02-08
EP2415527B1 true EP2415527B1 (en) 2013-11-06

Family

ID=43431225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10171860.9A Not-in-force EP2415527B1 (en) 2010-08-04 2010-08-04 Aeration device for a flotation cell, flotation cell and flotation method

Country Status (7)

Country Link
US (1) US8794446B2 (en)
EP (1) EP2415527B1 (en)
AU (1) AU2011287891B2 (en)
DK (1) DK2415527T3 (en)
PE (1) PE20131056A1 (en)
PL (1) PL2415527T3 (en)
WO (1) WO2012016721A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK2415527T3 (en) 2010-08-04 2014-02-10 Siemens Ag Gassing device for a flotation cell, flotation cell and flotation method
GB2516603B (en) * 2012-05-16 2016-09-14 Ross Dunman Barry Separator and method for treatment of a contaminated liquid
KR20230073044A (en) * 2021-11-18 2023-05-25 주식회사 엘지화학 Sparger and reactor comprising the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1268630A (en) * 1917-05-31 1918-06-04 Joseph P Ruth Jr Aerating device.
US1526596A (en) * 1922-06-09 1925-02-17 William E Greenawalt Apparatus for treating liquids with gases
US1583591A (en) * 1922-06-29 1926-05-04 William E Greenawalt Apparatus for treating liquids with gases
US1579355A (en) * 1923-06-11 1926-04-06 William E Greenawalt Apparatus for treating liquids with gases
GB1272047A (en) * 1971-04-06 1972-04-26 William Ewert Scragg Improvements in and relating to aerators
RU2004138727A (en) 2004-12-28 2006-06-10 Марк Григорьевич Видуецкий (RU) FLOTATION PNEUMATIC COLUMN MACHINE
DK2415527T3 (en) 2010-08-04 2014-02-10 Siemens Ag Gassing device for a flotation cell, flotation cell and flotation method

Also Published As

Publication number Publication date
AU2011287891B2 (en) 2013-11-28
AU2011287891A1 (en) 2013-02-28
PL2415527T3 (en) 2014-04-30
US8794446B2 (en) 2014-08-05
WO2012016721A1 (en) 2012-02-09
EP2415527A1 (en) 2012-02-08
US20130134101A1 (en) 2013-05-30
DK2415527T3 (en) 2014-02-10
PE20131056A1 (en) 2013-10-04

Similar Documents

Publication Publication Date Title
EP2308601A1 (en) Dispenser nozzle, flotation machine with dispenser nozzle and method for its operation
WO2006069995A1 (en) Pneumatic flotation column comprising a foam collecting container
EP2500102B1 (en) Flotation apparatus with a fluid distribution element for creating a fluid flow towards the froth collecting device
EP2572778B1 (en) Flotation machine with dispenser nozzle and method for its operation
DE4031262A1 (en) FLOTATION APPARATUS
WO2006061265A1 (en) Pneumatic flotation column
WO2012116848A1 (en) Flotation device, method for operating the flotation device and use thereof
EP2415527B1 (en) Aeration device for a flotation cell, flotation cell and flotation method
EP2266704A1 (en) Pneumatic flotation machine and flotation method
WO2012059415A1 (en) Flotation apparatus and flotation process
EP1375738A1 (en) Method for removing impurities from an aqueous fibre suspension
WO2011128154A1 (en) Gassing device for a flotation cell
DE4031260A1 (en) FLOTATION APPARATUS
WO2009115348A1 (en) Flotation cell for obtaining valuable material particles
DE202016107331U1 (en) Device for the flotative separation of a mixture of nano- and microstructures
DE3918213C2 (en)
EP2497575A1 (en) Flotation device with a gas diffuser made from a foam material
EP2676733A1 (en) Device for separating magnetic and/or magnetisable particles from a suspension and use of same
EP2623189A1 (en) Gassing device for a flotation device, flotation device and method for swapping at least one gas discharge unit of a gassing device
AT504955B1 (en) DIFFUSER FOR AN INJECTOR IN A FLOTATION CELL AND METHOD FOR FEEDING A FIBER SUSPENSION INTO THE FLOTATION CELL
DE4414272A1 (en) Device for gassing a suspension
EP0369015A1 (en) Flotation machine
DE102009006034A1 (en) Flotation method for removing impurities from aqueous fiber suspension in flotation container, involves collecting impurities of aqueous fiber suspension in flotation froth, and discharging impurities with flotation froth
DE102009010698A1 (en) Flotation device for the removal of impurities by using gas bubbles, comprises flotation container, where mixing device is provided for supplying flow of gas
DE102009040318A1 (en) Method for removing impurities from waste paper suspension, involves forming suspension jet, and pulling surface of suspension jet accessible to supplied gas during or after discharge from jet forming channel

Legal Events

Date Code Title Description
AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME RS

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20120709

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SIEMENS AKTIENGESELLSCHAFT

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20130529

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 639068

Country of ref document: AT

Kind code of ref document: T

Effective date: 20131215

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502010005263

Country of ref document: DE

Effective date: 20140102

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

Effective date: 20140203

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20131106

REG Reference to a national code

Ref country code: NO

Ref legal event code: T2

Effective date: 20131106

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140306

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

REG Reference to a national code

Ref country code: PL

Ref legal event code: T3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140306

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502010005263

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20140807

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502010005263

Country of ref document: DE

Effective date: 20140807

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140804

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NO

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140831

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140831

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140804

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140831

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140805

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20150430

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 502010005263

Country of ref document: DE

Owner name: PRIMETALS TECHNOLOGIES GERMANY GMBH, DE

Free format text: FORMER OWNER: SIEMENS AKTIENGESELLSCHAFT, 80333 MUENCHEN, DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140804

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140901

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20150812

Year of fee payment: 6

Ref country code: DK

Payment date: 20150819

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140804

REG Reference to a national code

Ref country code: PL

Ref legal event code: LAPE

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20151016

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140207

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20100804

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 639068

Country of ref document: AT

Kind code of ref document: T

Effective date: 20150804

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150804

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502010005263

Country of ref document: DE

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

Effective date: 20160831

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20160804

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160831

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160804

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131106