Diffuser device and flotation machine

Abstract

A diffuser device for a flotation machine (1) and a flotation machine. The invention relates to a diffuser device (100) for a flotation machine, said diffuser device (100) comprising a rod set (3) comprising at least two rods (4) arranged in parallel and located on at least one horizontal imaginary plane (P) of a structural element of the flotation machine.

Description

Technical Field

[0001] The present invention relates to a diffuser device for a flotation machine.

[0002] The invention further relates to a flotation machine comprising at least one diffuser device. Background Art

[0003] For many years, flotation cells have had problems with excessive turbulence on the surface of the machine which can have a serious impact on the grade of the froth concentrate produced by the flotation cell and the recovery rate of the flotation cell. Summary of the invention

[0004] Viewed from a first aspect, there is provided a diffuser device for a flotation machine, the diffuser device comprising a rod set, the rod set comprising at least two rods, the at least two rods being arranged in parallel on at least one horizontal imaginary plane of a structural element of the flotation machine.

[0005] Thus, a diffuser arrangement can be achieved to assist a flotation machine in successfully producing a froth concentrate without having to deal with excessive turbulence which would reduce the grade or recovery of the froth concentrate. One of the main advantages of a diffuser arrangement is that it does not experience solids build-up which would reduce its efficiency.

[0006] Viewed from another aspect, there may be provided a flotation machine comprising at least one diffuser device as defined in the first aspect.

[0007] Thus, a flotation cell is obtained that produces a good froth concentrate. In the top area of ​​the flotation cell a more static zone is obtained, giving sufficient time for part of the entrained gangue to be discharged from the froth zone, thus maintaining the grade of the froth concentrate. In these upper areas, close to the semi-froth zone, the slurry velocity is reduced, so there is an opportunity for smaller bubbles to collide with each other and form larger bubbles.

[0008] The features of the diffuser device and the flotation machine are set out in the independent claims. The features of some other embodiments are set out in other claims. Embodiments of the invention are also disclosed in the description and drawings of the present patent application. The inventive content of the present patent application can also be defined in other ways than in the accompanying claims. The inventive content can also consist of several separate inventions, in particular if the invention is examined in terms of explicit or implicit sub-tasks or from the perspective of the benefits or interest groups obtained. Some of the definitions contained in the accompanying claims may be unnecessary from the perspective of an independent inventive idea. Features of different embodiments of the invention can be applied to other embodiments within the scope of the basic inventive concept.

[0009] Various embodiments of the various aspects may include at least one feature from the following paragraphs:

[0010] In one embodiment, the overall shape of the rod set in the horizontal plane is round, such as a circle.

[0011] This has the advantage of providing a symmetrical turbulence reduction effect.

[0012] In one embodiment, a rod set is arranged on a horizontal imaginary plane.

[0013] The advantage is that the structure is simple and only a small space is required in the vertical direction of the machine.

[0014] In one embodiment, the rods are arranged on at least two horizontal imaginary planes.

[0015] The advantage is that the effect of the diffuser device in preventing turbulence and generating smaller bubbles can be improved, thereby achieving a more efficient flotation process.

[0016] In one embodiment, the rod set is arranged around an element of a flotation machine.

[0017] This has the advantage of providing a symmetrical turbulence reduction effect around the element.

[0018] In one embodiment, the flotation machine comprises a vertically arranged blast tube for conveying slurry and air in the flotation machine, wherein the rod set is arranged around the blast tube, preferably coaxially with the blast tube.

[0019] This has the advantage of providing a symmetrical turbulence reduction effect around the air supply duct.

[0020] In one embodiment, the flotation machine comprises a wash tank, wherein the rod set is arranged at the wash tank.

[0021] The advantage is that it can prevent excessive turbulence in the washing tank and obtain a higher grade of foam concentrate in the washing tank.

[0022] In one embodiment, the rod set is located on the inner periphery of a flotation tank.

[0023] The advantage is that it can provide a wide and effective turbulence reduction field in the flotation tank.

[0024] In one embodiment, at least one of the rods is rounded, such as circular, in cross-section.

[0025] Its advantages are simple shape, no influence from flow direction, and can provide equal turbulence reduction effect.

[0026] In one embodiment, at least one of the rods has an angular cross-section, such as a triangle or a quadrilateral.

[0027] This has the advantage that the turbulence reducing effect of such an arrangement can be concentrated or directed in a desired manner.

[0028] In one embodiment, the dimensions of the rods arranged on at least two horizontal imaginary planes are set so that in a cross-section of the rod group, the outer edges of the rods form an angle with the horizontal plane that is between 30° and 60° (from the horizontal plane upward) or between -30° and -60° (from the horizontal plane downward).

[0029] The advantage is that the turbulence reduction effect of this arrangement can be optimized, thereby increasing the recovery rate of valuable particles.

[0030] In one embodiment, the ratio of the cross-sectional area of ​​the openings between the rods to the total cross-sectional area of ​​the group is in the range of 25% to 75%.

[0031] The advantage is that the turbulence reduction effect of this arrangement can be optimized, while the clogging risk of the diffuser device can be greatly reduced, thereby improving the recovery rate of valuable particles.

[0032] In one embodiment, the flotation machine includes at least one air supply pipe, and an impinger (impinger) arranged on the longitudinal axis of the air supply pipe and at a certain distance from an outlet of the air supply pipe, wherein the impinger is configured to deflect the pulp flow flowing out of the outlet and move it radially outward.

[0033] The advantage is that it can further promote the contact between flotation bubbles and slurry particles, while reducing turbulence in the upper part of the tank, thereby improving the recovery rate of valuable particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Some embodiments of the invention are described in more detail in the accompanying drawings, in which

[0035] Figure 1 is a partial cross-sectional diagram of the diffuser device and flotation machine.

[0036] Figure 2 is a schematic diagram of the diffuser device viewed from the bottom.

[0037] Figure 3 is a detailed schematic side view of a partial cross section of a diffuser device,

[0038] Figure 4 is a schematic side view of a cross-sectional detail of a diffuser device,

[0039] Figure 5 is a schematic side view of a cross-sectional detail of a diffuser device,

[0040] Figure 6 is a schematic side view of a cross-sectional detail of a diffuser device,

[0041] Figure 7 is a detailed schematic side view of the diffuser device,

[0042] Figure 8 is a detailed schematic side view of the diffuser device,

[0043] Fig. 9 is a schematic side view of a detail of the diffuser device,

[0044] Fig.10 is a schematic side view of a cross-sectional detail of a diffuser device,

[0045] Fig.11 is a schematic diagram of the diffuser device viewed from the top.

[0046] Fig.12 is a schematic diagram of the diffuser device viewed from the top.

[0047] Fig.13 is a schematic diagram of a flotation machine viewed from the top.

[0048] Fig.14 is a schematic diagram of a flotation machine viewed from the top.

[0049] Fig.15 is a schematic diagram of a flotation machine viewed from the top.

[0050] Fig.16 is a schematic side view of a diffuser device, and

[0051] Fig.17 is a schematic side view of a partial cross section of a diffuser device and a flotation machine.

[0052] In the accompanying drawings, some embodiments are simplified for clarity. Similar components are marked with similar reference numerals in the drawings.

[0053] [List of Reference Numerals]

[0054] 1Flotation cell

[0055] 2 Air supply duct

[0056] 3-pole set

[0057] 4 bars

[0058] 5. Exit port

[0059] 6 Outer edge

[0060] 7 Support beam

[0061] 8 Gap

[0062] 9 Flotation tank

[0063] 10 Impactor

[0064] 11 Baffle

[0065] 12 outlet nozzle

[0066] 13. Washing Trough

[0067] 14 Periphery

[0068] 15 Feeder

[0069] 100 Diffuser Device

[0070] A angle

[0071] AR Area

[0072] D, d diameter

[0073] E Distance

[0074] F Foam

[0075] L imaginary line

[0076] OA opening cross-sectional area

[0077] P imaginary plane

[0078] R Radius

[0079] S is the distance between two successive rods.

[0080] Y vertical direction DETAILED DESCRIPTION

[0081] Figure 1 is a schematic diagram of a partial cross section of a diffuser device and a flotation machine.

[0082] In one embodiment, the flotation machine 1 is a so-called pneumatic flotation machine, in which the flotation gas (usually air) is introduced into the high shear force device, such as a blast pipe 2 together with the slurry feeding device. In the present description, the term "blast pipe" covers the meaning of a device that feeds the flotation gas by itself or together with the slurry in the flotation machine. Thus, the blast pipe can be, for example, a slurry sprayer or a downcomer.

[0083] The fine flotation bubbles generated by the air supply pipe 2 can capture finer particles during the process of forming bubbles in the air supply pipe. In the flotation tank 9, the slurry and the flotation bubbles are discharged from the air supply pipe 2 through the outlet nozzle arranged at the outlet end 5 of the air supply pipe.

[0084] In one embodiment, the flotation machine 1 comprises 2 to 40 air supply pipes 2, preferably 4 to 24 air supply pipes. Generally, the air supply pipes 2 are arranged vertically, that is, their longitudinal axes are arranged along the vertical direction Y.

[0085] In one embodiment, due to the vacuum formed in the downcomer, the flotation gas is introduced into the air supply pipe in a self-priming manner. A flotation machine 1 including such an air supply pipe is generally referred to as a Jameson flotation machine, and the air supply pipe 2 is referred to as a downcomer. Figure 1 A downcomer of a Jameson flotation machine is shown.

[0086] In another embodiment, the flotation gas is pressurized before being introduced into the air supply pipe.

[0087] In one embodiment, the rod group 3 is arranged in a surrounding form around at least one air supply pipe 2, preferably around each air supply pipe 2 in the flotation machine.

[0088] In one embodiment, the flotation machine 1 includes a wash tank 13 for receiving the froth F overflow and draining the overflow from the flotation machine.

[0089] The flotation machine 1 may further include features and structures for directing and controlling the flow of slurry in the flotation tank 9 , such as baffles 11 .

[0090] Figure 2 This is a schematic diagram of the diffuser device viewed from the outlet end.

[0091] In one embodiment, the rod group 3 is arranged concentrically with the air supply pipe 2. That is, the center of the surrounding rods 4 is on the longitudinal axis of the air supply pipe.

[0092] In one embodiment, the rod 4 is arranged so that the longitudinal axis of the air supply tube is perpendicular to the overall shape of the rod 4. In other words, the longitudinal axis of the air supply tube is perpendicular to an imaginary plane P where the rod 4 is located.

[0093] In one embodiment, the rod group 3 includes 2 to 10 rods. Figure 2 The embodiment shown includes 6 rods. However, it should be noted that since the number of rods depends on the size of the flotation machine, etc., there may be dozens or even hundreds of rods in the flotation machine.

[0094] In one embodiment, the rods 4 of the rod set are fixed to each other by at least one supporting beam 7 . Figure 2 The embodiment shown includes four support beams, but the number may vary. Figure 2As shown, the rod group 3 is connected to the air supply pipe 2 by a support beam 7. Therefore, the rod group 3 makes the air supply pipe 2 a unit or module, which can be assembled in the flotation machine or removed from the flotation machine as a single unit. In one embodiment, the rod group 3 is connected to another element or part of the flotation tank 9 (such as a side wall or baffle) through the support beam 7.

[0095] In one embodiment, Figure 2 As shown, all the rods 4 in the rod group are formed in a circular or annular form, so the rod group 3 is circular. However, in some embodiments, the rod group or its periphery may have another shape. For example, its shape may be elliptical or polygonal, the latter with or without rounded vertices.

[0096] In one embodiment, the outer diameter D of the rod group 3 is at least 1.5 times the outer diameter d of the air supply pipe. In one embodiment, the outer diameter D is at least 2 times the outer diameter d of the air supply pipe.

[0097] In one embodiment, Figure 2 As shown, a gap 8 is left between the innermost rod 4 and the air supply pipe 2. This gap can prevent any solids from accumulating on the interface between the diffuser device and the air supply pipe.

[0098] In one embodiment, the horizontal spacing Sh of all adjacent rods 4 is the same in the rod group. In another embodiment, the horizontal spacing in the rod group varies. Here, "horizontal spacing" refers to the distance between the projections of adjacent rods 4 on the same horizontal plane. This projection can be Figure 2 In one embodiment, the spacing between two adjacent rods 4 is selected so that the ratio of the opening cross-sectional area between the rods 4 to the total cross-sectional area of ​​the group (composed of the opening cross-sectional area and the cross-sectional area of ​​the rods) is in the range of 25% to 75%.

[0099] Figure 3 is a detailed schematic side view of a partial cross section of a diffuser device.

[0100] It should be noted that the rod 4 disclosed in this description can be made of metal materials, such as steel, and can also be made of composite materials, such as reinforced polymer composite materials.

[0101] The rod group 3 includes a plurality of rods 4, that is, at least 2 rods, such as 4 to 10 rods. Figure 1 As shown, the overall shape of these rods is annular. The rods 4 are arranged on a plurality of superimposed horizontal imaginary planes P (e.g. Figure 3 and Figure 4 The rods 4 with the largest overall outer diameter are arranged on the lowest horizontal imaginary plane. The remaining rods 4 are arranged so that their overall outer diameters decrease as the distance from the largest rod 4 increases.

[0102] In one embodiment, the cross section of the rod 4 is angular, such as triangular or quadrilateral. Figure 3 The embodiment shown is an isosceles triangle rod 4, the bottom surface of which is arranged perpendicular to the vertical direction Y, and the vertex points upward, that is, away from the outlet end 5 of the air supply pipe.

[0103] It should be noted that the rod 4 with an asymmetric cross section can be positioned in many different ways relative to the horizontal imaginary plane P or the vertical direction Y. Furthermore, it is not necessary to position all rods similarly. Figure 3 One of the triangular bars shown is positioned with its apex pointing downwards, ie towards the outlet end 5 etc.

[0104] In one embodiment, all rods 4 in the rod set 3 have the same cross-sectional shape and size. In another embodiment, the rod set 3 comprises a plurality of rods of different shapes and / or sizes.

[0105] In one embodiment, the rods 4 in all rod groups are positioned so that the imaginary line L passes through the outer edge or periphery 6 of the rod and forms an angle A with the vertical direction Y. In one embodiment, the angle A is in the range of -30° to -60°. Here, "-" means that in the process of extending from one imaginary plane P downward to another imaginary plane P, the angle A is below the horizontal plane and the outer edge or periphery 6 increases. Figure 3 , angle A is approximately -45°.

[0106] Figure 4 is a schematic side view of a cross-sectional detail of a diffuser arrangement.

[0107] In one embodiment, the cross section of the rod 4 is round, such as a circle (such as Figure 4 as shown) or oval.

[0108] In one embodiment, the spacing S of all adjacent rods 4 is the same in the rod group. "Spacing" refers to the distance between the imaginary plane where the rods 4 are located and the imaginary plane perpendicular to the vertical direction Y. Figure 4 Two spacings S1 and S2 are shown. In one embodiment, the spacing between two adjacent rods 4 is selected so that the ratio of the opening cross-sectional area OA between the group of rods 4 to the total cross-sectional area AR of the group (composed of the opening cross-sectional area OA and the cross-sectional area of ​​the rods) is in the range of 25% to 75%. Figure 4 The opening cross-sectional area OA between the three rods 4 is shown in FIG.

[0109] In another embodiment, the spacing of the rods in the rod set is varied. Figure 4 The first spacing S1 may be greater than the second spacing S2, and vice versa.

[0110] Figure 5 is a schematic side view of a cross-sectional detail of a diffuser device. In one embodiment, the rod 4 has a quadrilateral cross section. Its cross section can be a square, a parallelogram, a trapezoid, etc. Figure 5 In the embodiment shown, the cross section of the rod is a parallelogram with a longer dimension and a shorter dimension. The longer dimension can be arranged perpendicular to the vertical direction Y. In another embodiment, the longer dimension can be arranged parallel to the longitudinal direction Y or at another angle to the longitudinal direction Y.

[0111] In the embodiment shown in the figures, all rods 4 in the set of rods have similar cross-sectional shapes and sizes. However, this is not always the case, i.e. in some embodiments, the rod set 3 includes rods 4 with different cross-sectional shapes and / or sizes.

[0112] Figure 6 is a schematic side view of a cross-sectional detail of a diffuser arrangement.

[0113] As already disclosed, all the rods 4 of the rod set can be positioned so that an imaginary line L passes through the outer edge or periphery 6 of the rod and forms an angle A with the vertical direction Y.

[0114] In another embodiment, Figure 6 As shown, at least one rod 4 of the set of rods is positioned so that the imaginary line L does not cross its outer edge. However, most of the rods 4 are on the L line defined herein. Figure 6 The outermost rods (or the rods with the largest overall diameter) are offset to the L line.

[0115] In one embodiment, the imaginary line L is not a straight line but a curve. It can be curved downward (such as Figure 6 The dotted line shown in the figure may also be bent upward.

[0116] Figure 7 is a schematic side view of the diffuser device in detail. In this embodiment, the rod 4 has a circular cross section, the spacing between two adjacent rods is 52%, and the angle A is +30°. Figure 3 and Figure 4 As defined in the relevant instructions.

[0117] The distance E between the outlet end 5 and the rod 4 closest to the outlet end may vary depending on the details of the flotation machine.In one embodiment, the height position of the rod set is selected so that it is in the pulp or slurry area of ​​the flotation machine.

[0118] Figure 8 is a schematic side view of a detail of the diffuser device. In this embodiment, the rods 4 have a circular cross section, the spacing between two adjacent rods is 60%, and the angle A is +45°. Figure 3and Figure 4 As defined in the relevant instructions.

[0119] Fig. 9 is a schematic side view of the diffuser device details. In this embodiment, the rod 4 has a circular cross section, the spacing between two adjacent rods is 71%, and the angle A is +60°. Figure 3 and Figure 4 As defined in the relevant instructions.

[0120] Fig.10 is a schematic side view of a cross-sectional detail of a diffuser device. In one embodiment, the rod 4 with the longest circumference is arranged at the top of the rod group 3. For example, if the rods are annular, the rod with the largest diameter is the topmost rod in the rod group. The remaining rods 4 in the rod group are arranged so that their circumference decreases as the distance from the topmost rod increases. In other words, the order of the rods is similar to, for example Figure 4 The opposite of what is shown.

[0121] In one embodiment, the rods 4 in all rod groups are positioned so that the imaginary line L passes through the outer edge or periphery 6 of the rods and forms an angle A with the vertical direction Y. In one embodiment, the angle A is in the range of +30° to +60°. Here, "+" means that when rising from one imaginary plane P to another imaginary plane P, the angle A is above the horizontal plane and the outer edge or periphery 6 increases. Figure 3 In the embodiment, angle A is about 30°.

[0122] Fig.11 is a schematic diagram of a diffuser device viewed from the top. The overall shape of the rod group 3 shown in the previous figures is circular. However, other overall shapes are also possible. In one embodiment, the overall shape of the rod group 3 is elliptical, such as Fig.11 As shown. Other circular shapes are also possible. In one embodiment, the overall shape of the rod group 3 is angular, for example Fig.12 The hexagon shown.

[0123] In one embodiment, the overall shape of the rod 4 is annular, so that it has a continuous or closed shape, e.g. Figure 2 and Fig.12 In one embodiment, the rod 4 is in a curved or angled, but discontinuous overall shape, such as Fig.11 In one embodiment, the rod group 3 can be composed of continuous and discontinuous rods.

[0124] Fig.13is a schematic diagram of a flotation machine viewed from the top. As discussed in this specification, the rod group 3 can be arranged around the air supply pipe or the downcomer. In another embodiment, the rod group 3 is arranged around another element or multiple elements of the flotation machine 1, such as a connecting wash tank pipe, a transition pipe, an internal or external wash tank, an axis in a mechanical cell, such as a rotor shaft, an open pipe, a dart valve shaft, etc., that is, any location where turbulence may occur. Therefore, the diffuser device 100 can also be used in flotation processes based on mechanical cells, columnar cells, fluidized bed flotation machines, and can also be used in any flotation machine that produces foamy or non-foamy concentrates, as long as bubbles or gas phases appear in the process.

[0125] In one embodiment, the flotation machine 1 comprises a central washing tank 15 for supplying slurry, and the rod group 3 is arranged around the central washing tank. In one embodiment, the rod group 3 is arranged concentrically with the central washing tank 15.

[0126] Fig.14 is a schematic diagram of a flotation machine viewed from the top. Fig.14 As shown, the rod group 3 is located around the periphery 14 of the flotation tank 9. The rod 4 with the longest circumference or the largest diameter (such as a ring-shaped rod) is arranged closest to the flotation tank wall, which can be the lowest or highest rod in the rod group 3 in the embodiment, and these rods are arranged on at least two horizontal imaginary planes.

[0127] Fig.15 Schematic diagram of a flotation machine viewed from the top. The flotation machine 1 may have a flotation tank 9 that is polygonal (eg quadrilateral). Fig.15 Four different diffuser devices 100 are shown in a flotation machine 1. It should be noted that the described embodiments and other embodiments described in this specification may be present in different combinations in a flotation machine, depending on the size, shape and use of the flotation machine.

[0128] In one embodiment, the diffuser device 100 is composed of straight rods. These rods can be arranged at the periphery of the flotation machine or at the wash tank 13, such as Fig.15 As shown below right. In one embodiment, the rod may have two or more straight sections that are angled. Fig.15 The upper left side shows that the straight rod 4 has a right angle.

[0129] In one embodiment, the rod 4 forms a closed angular loop. Fig.15 The lower left side is the rod 4, which is rectangular in shape as a whole.

[0130] In one embodiment, the diffuser device 100 includes a combination of closed loop multiple rods and open ended / discontinuous rods. Fig.15 The upper right of shows an embodiment consisting of a straight rod and a circular rod with an angled portion.

[0131] In one embodiment, Figure 2 As shown, there is a gap 8 between the innermost rod 4 and the structural element in which the group of rods is arranged. This gap can prevent any solids from accumulating at the interface of the diffuser device and the air supply pipe.

[0132] Fig.16 is a schematic side view of a diffuser device. In one embodiment, Fig.16 As shown, an impactor 10 is arranged below the air supply pipe and coaxially therewith, and is far away from the outlet end 5.

[0133] In one embodiment, the impactor 10 includes a concave surface facing the corresponding air supply pipe, such as a dome shape or a bowl shape.

[0134] The impactor 10 deflects the flow of slurry (mixed with a flotation gas, typically air) exiting the outlet port 5 and directs the flow radially outward toward the sidewalls of the flotation tank 9 and upward toward the upper portion of the flotation tank. In one embodiment, the rod set 3 is arranged so that at least a majority of the flow that bounces or reflects off the impactor 10 encounters the rod 4.

[0135] Fig.17 is a schematic side view of a partial cross section of a diffuser device and a flotation machine. Fig.17 An embodiment in which the diffuser device 100 is arranged at three positions of the flotation machine 1 is shown. Fig.17 The embodiments of the diffuser device 100 shown and discussed below may all be present in one and the same flotation machine 1, but this is not required for all embodiments.

[0136] In one embodiment, at least one rod group 3 is arranged at the inner periphery 14 of the flotation tank. The rod group 3 may go around all the inner edges, but this is not necessary.

[0137] In one embodiment, the flotation machine 1 includes a wash tank 13 arranged at the upper part of the flotation machine to receive the froth overflow. The wash tank can be an external wash tank, such as Fig.17 As shown, it is also possible to arrange an internal washing tank (not shown) inside the flotation machine. At least one rod group 3 can be arranged in the washing tank or on the washing tank wall.

[0138] In one embodiment, the flotation machine 1 comprises a feeder 15 for supplying slurry and optionally adding air to the flotation machine. At least one rod group 3 may be arranged around the feeder 15 .

[0139] It should be noted that the position and angle of the rod group 3 and the number of rods in the rod group can be Fig.17In an embodiment of the flotation machine 1 which creates a froth or a froth layer F, the rod set 3 is arranged below the froth layer F.

[0140] The present invention is not limited to the specific forms described above, but can be modified in many ways within the scope of the inventive concept defined by the following claims. Within the scope of the inventive concept, properties of different embodiments and applications can be used or replaced with properties of another embodiment or application.

[0141] The drawings and the related description are intended only to illustrate the concept of the invention. The invention may vary in its details within the scope of the inventive concept defined by the appended claims.

Claims

1. A diffuser device for a flotation machine (1), the diffuser device (100) comprising: Rod set (3), The rod group (3) comprises at least two rods (4) which are arranged in parallel and are located on at least one horizontal imaginary plane (P) of a structural element of the flotation machine.

2. Diffuser device according to claim 1, wherein the cross section of the rod (4) is round, for example circular.

3. Diffuser device according to claim 1, wherein the cross section of the rod (4) is angular, for example triangular or quadrilateral.

4. Diffuser device according to any of the preceding claims, wherein the overall shape of the rod (4) is round, such as annular.

5. Diffuser device according to any one of claims 1-3, wherein the overall shape of the rod (4) is straight or angular.

6. Diffuser device according to any of the preceding claims, wherein the rods (4) are arranged on a horizontal imaginary plane (P).

7. Diffuser device according to any one of claims 1 to 5, wherein the rods (4) are arranged on at least two horizontal imaginary planes (P).

8. A diffuser device according to claim 7, wherein the size and position of the rods (4) are set so that in the cross section of the rod group (3), the outer edge (6) of the rod forms an angle (A) with the horizontal plane, and the angle is in the range of +30° to +60° (from the horizontal plane upward) or in the range of -30° to -60° (from the horizontal plane downward).

9. Diffuser device according to any one of the preceding claims, wherein in an imaginary plane of vertical arrangement the open cross-sectional area (OA) between the rods (4) accounts for 25% to 75% of the total cross-sectional area (AR) of the rod group.

10. The diffuser device according to any one of the preceding claims, wherein in a horizontally arranged imaginary plane, the projection of the open cross-sectional area (OA) between the rods (4) accounts for 25% to 75% of the projection of the total cross-sectional area (AR) of the rod group.

11. Diffuser device according to any of the preceding claims, wherein the rod group (3) is arranged as an element surrounding the flotation machine (1).

12. Diffuser device according to any of the preceding claims, wherein the rod group (3) is arranged at the inner periphery of an element of the flotation machine (1).

13. A diffuser device according to claim 11, wherein the flotation machine (1) comprises a vertically arranged air supply pipe (2), which is used to supply slurry and air into the flotation machine, and wherein the rod group (3) is arranged around the air supply pipe (2), preferably concentrically arranged with the air supply pipe (2).

14. The diffuser device according to claim 8, wherein the flotation machine (1) comprises a wash tank (13), and wherein the rod group (3) is arranged at the wash tank (13).

15. Diffuser device according to claim 12, wherein the rod set (3) is located at the periphery (14) of the flotation tank.

16. A flotation machine (1) comprising at least one diffuser device as claimed in any one of the preceding claims.

17. The flotation machine according to claim 16, comprising: The air supply duct (2) according to claim 13, and An impactor (10) is arranged below the air supply pipe and at a certain distance from the outlet end (5) of the air supply pipe, and is configured to deflect the slurry flow flowing out of the outlet end (5) and guide the slurry flow radially outward.

18. A flotation machine according to claim 16 or 17, wherein the height position of the rod group (3) is selected so that the height position is in the pulp or slurry area of ​​the flotation machine (1).

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