A flotation device and separation method for wide particle size materials

Abstract

The present invention provides a flotation device and separation method for wide-size materials, relating to the field of mineral processing technology, to solve the technical problem that flotation equipment has difficulty separating wide-size materials. The flotation device for wide-size materials comprises a mineralization pipe, a first foam flow generator, an annular distributor, and a first flotation column, a second flotation column, and an overflow trough, which are sequentially connected from bottom to top; the first flotation column penetrates the bottom wall of the second flotation column and extends to the middle of the second flotation column, and the second flotation column penetrates the bottom wall of the overflow trough and extends to the middle of the overflow trough; the mineralization pipe penetrates the bottom wall of the first flotation column and extends to the middle of the first flotation column; the distributor surrounds the periphery of the mineralization pipe and is located near the bottom wall of the first flotation column. The distributor is connected to the first foam flow generator. The flotation device can enhance the efficiency of separating coarse and medium particles.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to a flotation device and a separation method for wide-size material. Background Art

[0002] Flotation is widely used in mineral processing for the separation of metal ores such as iron, copper, and zinc, as well as non-metallic ores such as coal, phosphorus, and graphite. The flotation column, a core piece of flotation equipment, requires no transmission and is easy to install. However, in related technologies, flotation columns are generally used for separating fine-grained minerals and are poorly effective for separating medium- and coarse-grained materials. Summary of the Invention

[0003] The object of the present invention is to provide a flotation device and a separation method for materials with a wide particle size range, so as to solve the technical problem that flotation equipment is difficult to separate materials with a wide particle size range.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a wide-size material flotation device, comprising a mineralization pipe, a first foam flow generator, an annular distributor, and a first flotation column, a second flotation column, and an overflow tank sequentially connected from bottom to top;

[0006] The first flotation column passes through the bottom wall of the second flotation column and extends to the middle of the second flotation column, and the second flotation column passes through the bottom wall of the overflow tank and extends to the middle of the overflow tank;

[0007] The mineralization pipe passes through the bottom wall of the first flotation column and extends to the middle of the first flotation column;

[0008] The distributor surrounds the periphery of the mineralization pipe and is located near the bottom wall of the first flotation column. The distributor is communicated with the first foam flow generator.

[0009] According to at least one embodiment of the present invention, the flotation device further includes a second foam flow generator and a slurry feeding device, and one end of the mineralization pipe located outside the first flotation column is connected to the second foam flow generator and the slurry feeding device.

[0010] According to at least one embodiment of the present invention, the mineralized tube is an elongated tube.

[0011] According to at least one embodiment of the present invention, there are multiple mineralization tubes, and the distributor surrounds the periphery of each mineralization tube.

[0012] According to at least one embodiment of the present invention, there are a plurality of first foam flow generators, and the first foam flow generators are evenly distributed along the circumference of the distributor.

[0013] According to at least one embodiment of the present invention, the flotation device further includes a controller and a second liquid level gauge and a second valve respectively communicatively connected to the controller, the second liquid level gauge being provided on the second flotation column, and the second valve being provided on the bottom wall of the second flotation column;

[0014] The controller is used to control the liquid level in the second flotation column, and the liquid level is higher than the top of the first flotation column and lower than the top of the second flotation column.

[0015] According to at least one embodiment of the present invention, the orthographic projection of the first flotation column on a preset plane is located within the orthographic projection of the second flotation column on a preset plane, and the preset plane is parallel to a horizontal plane.

[0016] According to at least one embodiment of the present invention, the cross-sections of the first flotation column and the second flotation column are both circular, and the ratio of the inner diameters of the first flotation column to the second flotation column is in the range of 1:(1.2-3); and / or,

[0017] The ratio of the height of the axis of the first flotation column to the height of the axis of the second flotation column is in the range of 1:(0.5-1).

[0018] According to at least one embodiment of the present invention, the flotation device further includes a first liquid level gauge and a first valve respectively connected to the controller, the first liquid level gauge is provided on the first flotation column, and the first valve is provided on the bottom wall of the first flotation column;

[0019] The controller is further configured to control the amount of solids in the second flotation column.

[0020] According to at least one embodiment of the present invention, the bottom wall of the first flotation column, the bottom wall of the second flotation column, and the bottom wall of the overflow tank are all bottom walls inclined downward;

[0021] The first valve is located at the lower end of the bottom wall of the first flotation column, and the second valve is located at the lower end of the bottom wall of the second flotation column; and / or,

[0022] The flotation device further comprises a third valve arranged on the bottom wall of the overflow trough, wherein the third valve is located at the lower end of the bottom wall of the overflow trough.

[0023] According to at least one embodiment of the present invention, the distributor has a plurality of through holes, and the plurality of through holes are formed on the top surface of the distributor.

[0024] According to at least one embodiment of the present invention, both the first foam flow generator and the second foam flow generator include a Venturi tube.

[0025] According to at least one embodiment of the present invention, the diameter of the bubbles entering the first flotation column from the distributor is less than 1.5 mm.

[0026] In a second aspect, the present invention further provides a separation method, which uses the flotation device described in the first aspect to perform flotation.

[0027] One or more technical solutions provided in the exemplary embodiments of the present invention can achieve at least one of the following beneficial effects.

[0028] The wide particle size material flotation device of the exemplary embodiment of the present invention includes a first flotation column, a second flotation column and an overflow tank connected in sequence from bottom to top. After the slurry is mineralized once in the mineralization pipe, it is introduced into the middle of the first flotation column, and the distributor surrounding the periphery of the mineralization pipe provides an ascending foam flow in the first flotation column, providing a low-turbulence ascending foam flow sorting environment. After the slurry is injected from the mineralization pipe, some coarse-grained valuable minerals will undergo secondary mineralization in the low-turbulence ascending foam flow sorting environment during the descent process. The mineralized gas flocs formed by the primary and secondary mineralization float up into the second flotation column under the upward fluid drag. The valuable mineral monomer particles pass through the foam layer to become concentrate, and some coarse-grained gas flocs and fine-grained gangue minerals settle in the second flotation column to become middlings; while the coarse-grained gangue minerals are deposited in the first flotation column due to insufficient buoyancy. Based on this, through the mutual coordination of the distributor and the mineralization tube, the low-turbulence ascending foam flow allows the medium and coarse particles to undergo secondary mineralization when they descend, while providing upward fluid drag for the medium and coarse mineralized gas flocs, thereby enhancing the sorting efficiency of medium and coarse particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0030] Figure 1 3 is a schematic diagram of the main structure of a wide particle size material flotation device according to an embodiment of the present invention.

[0031] Figure numerals: 10, first flotation column; 11, first liquid level gauge; 12, first valve; 20, second flotation column; 21, second liquid level gauge; 22, second valve; 30, overflow tank; 32, third valve; 40, mineralization pipe; 41, second foam flow generator; 50, distributor; 51, first foam flow generator; 60, spraying device. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Before introducing the embodiments of the present invention, the following definitions are given for the relevant terms involved in the embodiments of the present invention:

[0034] Mineralization refers to an important operation in the flotation process, that is, before flotation, necessary flotation reagents such as adjusters, inhibitors, sulfiding agents, dispersants, activators and collectors are added to the pulp, stirred in stages, and the pH value of the pulp or the inhibitory, activating and collecting effects of the reagents are adjusted in turn to make the pulp reach a state suitable for flotation requirements.

[0035] Particle-bubble adhesion refers to the process from the encounter between particles and bubbles to the thinning and rupture of the liquid film and finally to the three-phase wetting and spreading around to form stable mineralized gas flocs.

[0036] Figure 1 Schematic diagram of the main structure of the wide particle size material flotation device according to the embodiment of the present invention. Figure 1 As shown, the wide particle size material flotation device provided by the exemplary embodiment of the present invention includes a mineralization pipe 40, a first foam flow generator 51, an annular distributor 50, and a first flotation column 10, a second flotation column 20 and an overflow trough 30 connected in sequence from bottom to top; the first flotation column 10 passes through the bottom wall of the second flotation column 20 and extends to the middle of the second flotation column 20, and the second flotation column 20 passes through the bottom wall of the overflow trough 30 and extends to the middle of the overflow trough 30; the mineralization pipe 40 passes through the bottom wall of the first flotation column 10 and extends to the middle of the first flotation column 10; the distributor 50 surrounds the periphery of the mineralization pipe 40 and is located near the bottom wall of the first flotation column 10, and the distributor 50 is connected to the first foam flow generator 51.

[0037] In actual application, the first foam flow generator 51 generates a foam flow that enters the annular distributor 50. Since the distributor 50 is located near the bottom wall of the first flotation column 10, the foam flow enters the first flotation column 10 through the openings on the surface of the annular distributor. The gas phase concentration in the first flotation column 10 is high, while the solid phase concentration is low. The first flotation column 10 generally presents an upward flow state, forming a low-turbulence upward foam flow sorting environment; primary mineralization occurs in the slurry mineralization pipe 40, such as valuable minerals, especially fine-grained valuable minerals and bubbles, which undergo preliminary mineralization and flow upward into the middle of the first flotation column 10.

[0038] After the primary mineralization, some valuable minerals, especially coarse-grained valuable minerals, will descend after coming out from the top of the mineralization pipe 40. They will undergo secondary mineralization in the low-turbulence rising foam flow sorting environment of the first flotation column 10. The formed mineralized gas flocs will float up and enter the second flotation column 20 under the upward fluid drag. Fine-grained valuable minerals will also enter the second flotation column 20 under the action of water drag. Coarse-grained gangue minerals will sink in the first flotation column 10 and become tailings due to insufficient buoyancy.

[0039] Within the second flotation column 20, a foam layer forms at the top. Valuable mineral particles pass through the foam layer and enter the overflow tank 30 to become concentrate. Some coarse-grained gas flocs and fine-grained gangue minerals settle within the second flotation column 20 to become middlings. Thus, by introducing a low-turbulence, rising foam flow, a static mineralization environment is created for the coarse and medium-grained particles to float upward, while also providing upward fluid drag for the coarse and medium-grained mineralized gas flocs, reducing their buoyancy limitations and enhancing the coarse particle separation efficiency. The flotation apparatus of this exemplary embodiment of the present invention is suitable for separating materials from fine to coarse particle sizes.

[0040] It should be noted that the middle of each flotation column mentioned above refers to the middle position in the height direction.

[0041] It should also be noted that, taking the metal mining field as an example to illustrate the commonly used particle sizes in flotation, generally fine particles refer to particles with a diameter less than 0.074 mm, medium particles refer to particles with a diameter of 0.074 mm to 0.25 mm, and coarse particles refer to particles with a diameter greater than 0.25 mm.

[0042] In some embodiments, as Figure 1 As shown, the flotation device further includes a second foam flow generator 41 and a slurry feeding device (not shown in the figure), and one end of the mineralization pipe 40 located outside the first flotation column 10 is connected to the second foam flow generator 41 and the slurry feeding device.

[0043] The second foam flow generator 41 and the slurry feeding device respectively introduce the foam flow and slurry into the mineralization pipe 40. Because the mineralization pipe 40 is an elongated tube, the slurry and foam flow are vigorously mixed in the mineralization pipe 40. Valuable minerals, especially fine-grained valuable minerals, and bubbles undergo primary mineralization and flow upward, ultimately entering the first flotation column 10. Turbulent mineralization in the mineralization pipe 40 is more conducive to the mineralization of fine-grained valuable minerals.

[0044] For example, there are multiple mineralization tubes 40, and the distributor 50 surrounds the periphery of each mineralization tube 40. Figure 1As shown, there are two mineralization tubes 40, both of which are identical and elongated. They are symmetrically arranged relative to the central axis of the first flotation column 10. The spacing between the two mineralization tubes 40 and the spacing between the mineralization tubes 40 and the corresponding inner walls of the first flotation column 10 are consistent or approximately consistent, thereby ensuring relatively uniform distribution of the slurry within the first flotation column 10. The elongated mineralization tubes 40 also ensure that coarse and medium-sized valuable minerals have sufficient space for secondary mineralization during their descent, thereby improving the separation rate of coarse and medium-sized valuable minerals.

[0045] Considering that in actual factory production, the first flotation column 10 is relatively large, for example, having a diameter of several meters, this results in uneven rising foam flow in the first flotation column 10. Exemplarily, there are multiple first foam flow generators 51, each of which is evenly distributed along the circumference of the distributor 50. For example, two first foam flow generators 51 are symmetrically arranged on either side of the distributor 50 so that the rising foam flow generated in various parts of the distributor 50 within the first flotation column 10 is evenly distributed, thereby providing a low-turbulence rising foam flow environment that is conducive to secondary mineralization.

[0046] In some embodiments, the flotation device further includes a controller and a second liquid level gauge 21 and a second valve 22 respectively connected to the controller for communication. The second liquid level gauge 21 is provided on the second flotation column 20, and the second valve 22 is provided on the bottom wall of the second flotation column 20. The controller is used to control the liquid level in the second flotation column 20, and the liquid level is higher than the top of the first flotation column 10 and lower than the top of the second flotation column 20.

[0047] In practice, a second liquid level gauge 21 is located near the bottom wall of the second flotation column 20 to measure the liquid level there. A second valve 22 is located on the bottom wall of the second flotation column 20 to discharge middlings deposited therein. A controller controls the opening of the second valve 22 based on the liquid level measured by the second liquid level gauge 21, thereby adjusting the liquid level and maintaining a foam layer at the top of the second flotation column 20.

[0048] For example, the liquid level in the second flotation column 20 must be higher than the top of the first flotation column 10. Otherwise, a fluid interface will exist between the second flotation column 20 and the first flotation column 10, which will deteriorate the coarse particle separation effect. At the same time, the liquid level in the second flotation column 20 must be lower than the top of the second flotation column 20. Otherwise, the foam layer at the top of the second flotation column 20 will disappear. Based on this, the thickness of the foam layer can be reduced to facilitate the floating of coarse valuable minerals.

[0049] In some embodiments, the orthographic projection of the first flotation column 10 on a predetermined plane is located within the orthographic projection of the second flotation column 20 on the predetermined plane, and the predetermined plane is parallel to the horizontal plane. In other words, the cross-sectional dimensions of the first flotation column 10 are smaller than the cross-sectional dimensions of the second flotation column 20.

[0050] For example, the cross-sections of the first flotation column 10 and the second flotation column 20 are both circular, and the ratio of the inner diameters of the first flotation column 10 to the second flotation column 20 is in the range of 1:(1.2-3), optionally 1:(1.5-2.5), and further optionally 1:2. The ratio of the heights of the axis of the first flotation column 10 to the axis of the second flotation column 20 is in the range of 1:(0.5-1). It should be noted that the height of the axis of the first flotation column 10 refers to the distance from the center point of the bottom wall of the first flotation column 10 to the top opening thereof. Similarly, the height of the axis of the second flotation column 20 refers to the distance from the center point of the bottom wall of the second flotation column 20 to the top opening thereof.

[0051] When the mineralized gas flocs enter the second flotation column 20 from the first flotation column 10, the fluid velocity decreases due to the larger diameter of the second flotation column 20 relative to the first flotation column 10, and the slurry becomes relatively static. At the same time, a foam layer forms at the top of the second flotation column 20. After the material flows into the second flotation column 20 area, the valuable mineral monomer particles pass through the foam layer and enter the overflow trough 30 to become concentrate. Some coarse gas flocs and fine gangue minerals settle in the second flotation column 20 to become middlings and are discharged through the corresponding discharge port. The separation effect is better when the ratio of the inner diameters of the first flotation column 10 to the second flotation column 20 is in the range of 1:(1.2-3).

[0052] For example, the ratio of the inner diameter of the mineralization tube 40 to the inner diameter of the first flotation column 10 is in the range of 1:(5-10). The slender rod of the mineralization tube 40 can cause the foam flow and the slurry to mix vigorously, introducing a turbulent mineralization field and enhancing the mineralization of fine particles. For example, half of the mineralization tube 40 is located within the first flotation column 10, and the other half is located in the external environment, providing sufficient time and space for the primary mineralization of the slurry.

[0053] Considering that the amount of solid deposited in the first flotation column 10 is too much, it will lead to bubble merging and poor distribution, which is not conducive to the mineralization flotation of the slurry. Figure 1 As shown, the flotation device of the exemplary embodiment of the present invention further includes a first liquid level gauge 11 and a first valve 12 respectively connected to the controller for communication. The first liquid level gauge 11 is provided on the first flotation column 10, and the first valve 12 is provided on the bottom wall of the first flotation column 10. The controller is also used to control the amount of solids in the second flotation column 20.

[0054] In practical applications, the first liquid level gauge 11 is arranged near the bottom wall of the first flotation column 10. The controller can obtain the amount of solids in the first flotation column 10 through the difference between the second liquid level gauge 21 of the second flotation column 20 and the first liquid level gauge 11. The controller controls the opening of the first valve 12, thereby controlling the discharge speed of the tailings and maintaining the amount of deposited solids in the first flotation column 10 at a constant level.

[0055] In some embodiments, as Figure 1 As shown, the bottom wall of the first flotation column 10, the bottom wall of the second flotation column 20, and the bottom wall of the overflow trough 30 are all downwardly inclined bottom walls; the first valve 12 is located at the lower end of the bottom wall of the first flotation column 10, and the second valve 22 is located at the lower end of the bottom wall of the second flotation column 20; the flotation device also includes a third valve 32 provided on the bottom wall of the overflow trough 30, and the third valve 32 is located at the lower end of the bottom wall of the overflow trough 30.

[0056] When the cross-sections of the first flotation column 10, the second flotation column 20, and the overflow trough 30 are all circular, the bottom walls of the above three are all sloped to facilitate the deposition and collection of solids at the lower end of the bottom wall. For example, the first valve 12 is located at the lower end of the bottom wall of the first flotation column 10, the second valve 22 is located at the lower end of the bottom wall of the second flotation column 20, and the third valve 32 is located at the lower end of the bottom wall of the overflow trough 30. The third valve 32 controls the discharge of the concentrate, the second valve 22 controls the discharge of the middlings, and the first valve 12 controls the discharge of the tailings. The coarse tailings can be discarded, the concentrate is a qualified product, and the middlings are graded by the grading cyclone and then ground and flotated. Based on this, by strengthening the tailings of coarse and medium-grained minerals, the pre-selection tailings of coarse and medium-grained minerals can be achieved, the amount of ore entering the mill and the amount of fine-grained tailings discharged are reduced, and the coarse tailings are easier to dehydrate, transport, and utilize as resources.

[0057] By integrating multiple flow fields in one flotation unit, fine particle separation and medium-coarse particle tailings can be achieved simultaneously, effectively simplifying the separation process.

[0058] In some embodiments, as Figure 1 As shown, the distributor 50 has a plurality of through holes formed on the top surface of the distributor 50. The through holes are used for the foam flow to enter the first flotation column 10 to form a low-turbulence rising foam flow.

[0059] Exemplarily, the foam flow is generated by a Venturi tube. Specifically, the first foam flow generator 51 includes a Venturi tube and a water pipe. A fixed flow of water is introduced into the water distribution chamber. As the water flows through the Venturi tube, the airflow is sucked into the Venturi tube, dispersed into small bubbles, and forms a bubble flow that enters the annular distributor 50. The bubble flow enters the first flotation column 10 through the through holes on the surface of the distributor 50. The bubbles are finely dispersed and less than 1.5 mm in size, forming a low-turbulence rising foam flow separation environment.

[0060] like Figure 1 As shown, the flotation apparatus of the exemplary embodiment of the present invention further includes a spray device 60, which is disposed directly above the overflow trough 30 and opposite the opening of the second flotation column 20. The spray device 60 can perform leaching based on the froth phenomenon and the concentrate grade, washing away gangue and slime entrained in the concentrate foam, thereby achieving a secondary enrichment effect.

[0061] The exemplary embodiment of the present invention further provides a separation method, which uses the flotation device of the above embodiment to perform flotation, and may include the following steps:

[0062] Step 101 : Generate an ascending foam flow through the distributor 50 and the first foam flow generator 51 and introduce it into the first flotation column 10 .

[0063] Step 102 : After the first flotation column 10 is filled with fluidized water, the slurry is mineralized once through the mineralization pipe 40 and the second foam flow generator 41 , and then introduced into the first flotation column 10 .

[0064] In this step, the slurry after primary mineralization undergoes secondary mineralization in the rising foam flow environment in the first flotation column 10, and the mineralized gas flocs formed by the primary and secondary mineralization are carried by the upward fluid drag and float into the second flotation column 20.

[0065] The liquid surface between the first flotation column 10 and the second flotation column 20 is controlled to have no interface, thereby eliminating the influence of the fluid interface on the floating of coarse particles;

[0066] In the first flotation column 10, coarse gangue minerals sink due to insufficient buoyancy and become tailings. In the second flotation column 20, the slurry is static. Due to the foam layer on top, valuable mineral particles pass through the foam layer and settle on the bottom wall of the overflow trough 30 to form concentrate. Some coarse gas flocs and fine gangue minerals settle in the second flotation column 20 to become middlings and are discharged.

[0067] Step 103 : The controller controls the opening of the second valve 22 to maintain the foam layer in the second flotation column 20 .

[0068] Step 104 : The controller controls the opening of the first valve 12 to maintain the amount of solid accumulation in the first flotation column 10 .

[0069] The technical advantages of the above-mentioned separation method over the prior art are the same as those of the above-mentioned wide particle size material flotation device, and will not be described in detail here.

[0070] It should be understood by those skilled in the art that the above embodiments are merely for the purpose of illustrating the present invention clearly, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and such changes or modifications are still within the scope of the present invention.

Claims

1. A flotation device for wide particle size materials, characterized in that: It includes a mineralization pipe, a first foam flow generator, an annular distributor, and a first flotation column, a second flotation column and an overflow tank that are sequentially connected from bottom to top; The first flotation column penetrates the bottom wall of the second flotation column and extends to the middle of the second flotation column, so that the mineralized gas flocs in the first flotation column float up and enter the second flotation column. The second flotation column penetrates the bottom wall of the overflow tank and extends to the middle of the overflow tank. The distributor surrounds the periphery of the mineralization tube and is located near the bottom wall of the first flotation column. The distributor is connected to the first foam flow generator. The distributor has a plurality of through holes, and the plurality of through holes are formed on the top surface of the distributor. The mineralization tube passes through the bottom wall of the first flotation column and extends to the middle of the first flotation column; the mineralization tube is a slender tube; the ratio of the inner diameter of the mineralization tube to the inner diameter of the first flotation column is in the range of 1:(5-10); The cross-sections of the first flotation column and the second flotation column are both circular, and the ratio of the inner diameters of the first flotation column to the second flotation column is in the range of 1:(1.2-3); The flotation device further includes a second foam flow generator and a slurry feeding device, and one end of the mineralization pipe located outside the first flotation column is connected to the second foam flow generator and the slurry feeding device; The flotation device further includes a first liquid level gauge and a first valve respectively connected to the controller, the first liquid level gauge being provided on the first flotation column, and the first valve being provided on the bottom wall of the first flotation column; the controller is further configured to control the amount of solids in the second flotation column; The bottom wall of the first flotation column, the bottom wall of the second flotation column, and the bottom wall of the overflow trough are all bottom walls inclined downward.

2. The flotation device according to claim 1, characterized in that The first valve is located at the lower end of the bottom wall of the first flotation column, and the second valve is located at the lower end of the bottom wall of the second flotation column; and / or, The flotation device further comprises a third valve arranged on the bottom wall of the overflow trough, wherein the third valve is located at the lower end of the bottom wall of the overflow trough.

3. The flotation device according to claim 1, characterized in that The first foam flow generator and the second foam flow generator both include a Venturi tube.

4. The flotation device according to claim 1, characterized in that The diameter of the bubbles entering the first flotation column from the distributor is less than 1.5 mm.

5. The flotation device according to claim 1, characterized in that There are multiple mineralization tubes, and the distributor surrounds the periphery of each mineralization tube.

6. The flotation device according to claim 1, wherein: There are multiple first foam flow generators, and each of the first foam flow generators is evenly distributed along the circumference of the distributor.

7. A sorting method, characterized in that: Flotation is carried out using the flotation device according to any one of claims 1 to 6.

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