Flocculant adding device and thickener adding device having the same

Abstract

The present invention provides a flocculant adding device and a thickener feeding device having the same, wherein the flocculant adding device comprises: a delivery pipe; a distribution box, the distribution box comprises a top plate, a bottom plate and a side plate connected between the top plate and the bottom plate, an inlet is arranged on the top plate, an outlet is arranged on the bottom plate, the inlet and the outlet are arranged at intervals in the projection of the horizontal plane, the output end of the delivery pipe is connected to the inlet; and the distribution pipe is connected to the outlet. The technology of the present application can effectively solve the problem of increasing production costs by ensuring the flocculation effect through excessive addition of flocculants in the related art.

Description

Technical Field

[0001] The invention relates to the field of nonferrous metal hydrometallurgy, and in particular to a flocculant adding device and a thickener feeding device having the same. Background Art

[0002] At present, thickeners are mostly used in the liquid-solid separation or CCD washing process in non-ferrous metal hydrometallurgy (latite nickel ore HPAL, high nickel matte oxygen pressure leaching, MHP leaching, copper oxide hydrometallurgy, zinc smelting, etc.). The clarification speed of the leached slurry in the thickener and the sedimentation speed of the ore particles in the production largely depend on the size of the ore particles in the slurry. The fine ore particles are in a colloidal or semi-colloidal state, and the sedimentation speed in the solution is very slow, and they may even be suspended for a long time.

[0003] Therefore, flocculants need to be added during the sedimentation process to aggregate the dispersed fine mineral particles into larger aggregates, thereby accelerating the sedimentation rate of the mineral particles. However, the current method of adding flocculants is to directly use a delivery pipe to connect the flocculant solution storage box and the slurry feed pipeline. The delivery pipe adds the flocculant on the liquid surface, and the slurry and flocculant are mixed unevenly, affecting the flocculation effect, which in turn causes the thickener to have poor liquid-solid separation effect and slow slurry sedimentation rate. At present, in production, the flocculation effect is generally ensured by excessive addition of flocculants, which results in a large consumption of flocculants and increased production costs. Summary of the invention

[0004] The main purpose of the present invention is to provide a flocculant adding device and a thickener feeding device having the same, so as to solve the problem in the related art that excessive addition of flocculant is used to ensure the flocculation effect, thereby increasing production costs.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a flocculant adding device is provided, comprising: a delivery pipe; a distribution box, the distribution box comprising a top plate, a bottom plate and a side plate connected between the top plate and the bottom plate, an inlet is arranged on the top plate, an outlet is arranged on the bottom plate, the inlet and the outlet are arranged at intervals in the projection of the horizontal plane, the output end of the delivery pipe is connected to the inlet; and a distribution pipe is connected to the outlet.

[0006] Furthermore, the top plate has a first end and a second end in the first horizontal direction, the bottom plate has a first end and a second end in the first horizontal direction, the first end of the top plate is arranged corresponding to the first end of the bottom plate, the inlet is arranged at the first end of the top plate, and the outlet is arranged at the second end of the bottom plate.

[0007] Furthermore, an aeration plate is arranged in the distribution box, and the aeration plate is located below the delivery pipe. In the direction from the delivery pipe to the distribution pipe, the aeration plate is arranged to be tilted downward.

[0008] Furthermore, the angle between the aeration plate and the horizontal plane is between 45° and 60°.

[0009] Furthermore, there are multiple distribution pipes, and the multiple distribution pipes are arranged at intervals along the second horizontal direction, wherein the second horizontal direction is perpendicular to the first horizontal direction.

[0010] Furthermore, a flow partition extending along the second horizontal direction is arranged in the distribution box, the flow partition is located between the delivery pipe and the distribution pipe and is arranged close to the distribution pipe, the flow partition is connected to the bottom plate and the side plate and is spaced from the top plate.

[0011] Furthermore, the top of the flow divider has a plurality of flow splitting teeth arranged at intervals along the second horizontal direction.

[0012] Further, in a direction from the middle of the distribution box to the edge of the distribution box, the lengths of the plurality of distribution pipes gradually decrease.

[0013] Further, the length difference between adjacent distribution pipes is between 50 mm and 100 mm.

[0014] Furthermore, the delivery pipe includes a delivery main pipe and multiple delivery branch pipes connected to the delivery main pipe, there are multiple distribution boxes, each delivery branch pipe is provided with a distribution box, each distribution box is connected to at least one distribution pipe, and each delivery branch pipe is provided with a flow valve.

[0015] According to another aspect of the present invention, a thickener feeding device is provided, comprising a slurry feeding pipeline and a flocculant adding device, wherein the flocculant adding device is the above-mentioned flocculant adding device.

[0016] According to another aspect of the present invention, a thickener feeding device is provided, including a slurry feed pipeline and a flocculant adding device, the flocculant adding device is the above-mentioned flocculant adding device, a plurality of delivery branches are arranged at intervals along the extension direction of the slurry feed pipeline, each distribution pipe extends into the slurry feed pipeline, and in each two adjacent delivery branches, the flocculant delivery amount of the upstream delivery branch is greater than the flocculant delivery amount of the downstream delivery branch.

[0017] By applying the technical solution of the present invention, the delivery pipe is connected to the flocculant solution storage box, the distribution pipe is connected to the slurry feed pipeline, so as to add flocculant to the slurry feed pipeline, a distribution box is arranged between the delivery pipe and the distribution pipe, the inlet and outlet of the distribution box are arranged at a projection interval in the horizontal plane, the output end of the delivery pipe is connected to the inlet, the distribution pipe is connected to the outlet, the flocculant solution transmitted by the delivery pipe is dissipated and exhausted in the distribution box, and then transmitted to the slurry feed pipeline through the distribution pipe, so that the flocculant solution can be continuously and evenly added to the slurry feed pipeline, ensuring the use effect of the flocculant, and thus reducing the use amount of the flocculant. Therefore, the technical solution of the present application can effectively solve the problem of increasing production costs by excessively adding flocculants to ensure the flocculation effect in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It shows a schematic structural diagram of a delivery branch pipe, a distribution box and a distribution pipe according to an embodiment of a flocculant adding device of the present invention;

[0020] Figure 2 Shows Figure 1 A schematic structural diagram of the delivery branch pipe, the distribution box and the distribution pipe of the flocculant adding device from another angle; and

[0021] Figure 3 A schematic structural diagram of an embodiment of a thickener feeding device according to the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Delivery pipe; 11. Delivery main pipe; 12. Delivery branch pipe; 121. Flow valve; 20. Distribution box; 21. Top plate; 22. Bottom plate; 23. Side plate; 24. Aeration plate; 25. Flow divider; 251. Diverter tooth; 30. Distribution pipe; 31. Distribution hole; 40. Slurry feed pipeline; 41. Feed pipe; 42. Chute; 421. Liquid level line; 50. Thickener feed well;

[0024] L1, first horizontal direction; L2, second horizontal direction. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0028] The present application provides a flocculant adding device and a thickener feeding device having the same, wherein: Figure 1 and Figure 2 A schematic diagram showing a partial structure of an embodiment of a flocculant adding device according to the present application is shown. Figure 3 A schematic structural diagram of an embodiment of a thickener feeding device according to the present application is shown.

[0029] like Figures 1 to 3As shown, the embodiment of the flocculant adding device of the present application comprises: a conveying pipe 10, a distribution box 20, and a distribution pipe 30. Specifically, the distribution box 20 comprises a top plate 21, a bottom plate 22, and a side plate 23 connected between the top plate 21 and the bottom plate 22, an inlet is arranged on the top plate 21, an outlet is arranged on the bottom plate 22, the inlet and the outlet are arranged at intervals in the projection in the horizontal plane, the output end of the conveying pipe 10 is connected to the inlet; and the distribution pipe 30 is connected to the outlet.

[0030] By applying the technical solution of this embodiment, the delivery pipe 10 is connected to the flocculant solution storage box, the distribution pipe 30 is connected to the slurry feed pipeline 40, so as to add flocculant to the slurry feed pipeline 40, and a distribution box 20 is arranged between the delivery pipe 10 and the distribution pipe 30, the inlet and outlet of the distribution box 20 are arranged at intervals in the projection in the horizontal plane, the output end of the delivery pipe 10 is connected to the inlet, and the distribution pipe 30 is connected to the outlet, and the flocculant solution transmitted by the delivery pipe 10 is dissipated and exhausted in the distribution box 20, and then transmitted to the slurry feed pipeline 40 through the distribution pipe 30, so that the flocculant solution can be continuously and evenly added to the slurry feed pipeline 40, ensuring the use effect of the flocculant, and thus reducing the use amount of the flocculant. Therefore, the technical solution of this embodiment can effectively solve the problem of increasing production costs by excessively adding flocculants to ensure flocculation effect in the related art.

[0031] like Figure 1 As shown, the top plate 21 has a first end and a second end in the first horizontal direction L1, the bottom plate 22 has a first end and a second end in the first horizontal direction L1, the first end of the top plate 21 is arranged corresponding to the first end of the bottom plate 22, the inlet is arranged at the first end of the top plate 21, and the outlet is arranged at the second end of the bottom plate 22. After the flocculant solution enters the distribution box 20, it flows from the first end of the distribution box 20 (corresponding to the first end of the top plate 21 and the first end of the bottom plate 22) to the second end of the distribution box 20 (corresponding to the second end of the top plate 21 and the second end of the bottom plate 22) and then flows into the distribution pipe 30, so that the flocculant solution can fully dissipate energy and exhaust gas, so that the flocculant solution can be continuously and evenly added to the slurry feeding pipeline 40, ensuring the use effect of the flocculant.

[0032] like Figure 1 As shown, an aeration plate 24 is provided in the distribution box 20. The aeration plate 24 is located below the delivery pipe 10 and in the direction from the delivery pipe 10 to the distribution pipe 30 (i.e. Figure 1The aeration plate 24 is tilted downward. The flocculant solution transported through the delivery pipe 10 will first fall on the aeration plate 24, and then flow to the bottom plate 22 under the action of the aeration plate 24. The aeration plate 24 is tilted, and its contact area with the flocculant solution is large, which can eliminate the downward force of the flocculant solution (i.e., dissipate the energy of the flocculant solution) and remove the gas in the flocculant solution, so as to prevent the flocculant solution from directly flushing the bottom plate 22. Specifically, the angle between the aeration plate 24 and the horizontal plane is between 45° and 60°. Preferably, the angle between the aeration plate 24 and the horizontal plane can be 45°, 50°, 55° or 60°. Specifically, in this embodiment, the aeration plate 24 can be made of the same material as the top plate 21, the bottom plate 22 and the side plate 23 of the distribution box 20, and the aeration plate 24 is welded to the bottom plate 22 and the side plate 23 on all sides to prevent the flocculant solution from flowing into the space surrounded by the aeration plate 24 and the distribution box 20 and away from the distribution pipe 30 (i.e. Figure 1 The aeration plate 24 in the lower left space is difficult to flow out.

[0033] like Figure 2 As shown, in this embodiment, there are multiple distribution pipes 30, and the multiple distribution pipes 30 are arranged at intervals along the second horizontal direction L2, wherein the second horizontal direction L2 is perpendicular to the first horizontal direction L1. Multiple distribution pipes 30 are arranged to transport the flocculant solution to the slurry feeding pipeline 40, that is, multi-point addition is performed, so that the flocculant solution can be more evenly mixed with the slurry to ensure the flocculation effect. Multiple distribution pipes 30 are arranged at intervals along the second horizontal direction L2, so that the flocculant solution flowing into the distribution box 20 can flow evenly to the multiple distribution pipes 30, further ensuring the mixing effect of the flocculant solution and the slurry.

[0034] like Figure 1 and Figure 2 As shown, a flow divider 25 extending along the second horizontal direction L2 is provided in the distribution box 20. The flow divider 25 is located between the delivery pipe 10 and the distribution pipe 30 and is arranged close to the distribution pipe 30. The flow divider 25 is connected to both the bottom plate 22 and the side plate 23 and is spaced from the top plate 21. The flow divider 25 divides the distribution box 20 into two interconnected cavities (a first cavity corresponding to the delivery pipe 10 and a second cavity corresponding to the distribution pipe 30) along the first horizontal direction L1. The flocculant solution first accumulates in the first cavity. When the height of the flocculant solution is higher than the flow divider 25, it flows into the second cavity and then flows into the slurry feeding pipeline 40 through the distribution pipe 30, so that the flocculant solution can flow evenly to multiple distribution pipes 30, further ensuring the mixing effect of the flocculant solution and the slurry.

[0035] The above “the flow partition 25 is disposed close to the distribution pipe 30 ” means that in the first horizontal direction L1 , the distance between the flow partition 25 and the axis of the delivery branch pipe 12 of the delivery pipe 10 is greater than the distance between the flow partition 25 and the axis of the distribution pipe 30 .

[0036] Specifically, Figure 2 As shown, the top of the flow divider 25 has a plurality of diverter teeth 251 spaced apart along the second horizontal direction. The plurality of diverter teeth 251 can evenly divert the flocculant solution, thereby ensuring that the amount of flocculant flowing to each distribution pipe 30 is equal, further ensuring the mixing effect of the flocculant solution and the slurry.

[0037] like Figure 2 As shown, the lengths of the plurality of distribution pipes 30 gradually decrease in the direction from the middle of the distribution box 20 to the edge of the distribution box 20. Specifically, the slurry in the chute 42 of the slurry feed pipeline 40 is easily accumulated on both sides of the chute 42, so that the slurry flow rate in the chute 42 has the characteristics of a large flow rate in the middle and a small flow rate on both sides. The distribution pipe 30 corresponding to the position with a large flow rate is longer, and the distribution pipe 30 corresponding to the position with a small flow rate is shorter, which can ensure that the flocculant solution is in uniform contact with the slurry, thereby ensuring the mixing effect. In addition, the slurry in the chute 42 is generally divided into three layers, the upper layer is the clear night, the middle layer is the mixing zone, and the lower layer is the solid slurry zone. The flocculation effect is best when the distribution pipe 30 is inserted into the mixing zone. Since there are solid deposits on both sides of the chute 42, the liquid level in the mixing zone on both sides of the chute 42 rises. Correspondingly, setting the distribution pipe 30 extending into the area shorter can avoid the distribution pipe 30 being directly inserted into the solid slurry, which does not achieve the flocculation effect. In this embodiment, the length difference between adjacent distribution pipes 30 is between 50 mm and 100 mm. Preferably, the length difference can be 50 mm, 75 mm or 100 mm. Of course, in the specific implementation, the staff can adjust the length of the distribution pipe 30 according to the properties of the slurry, the amount of flocculant added, the depth of the chute, etc., to ensure the flocculation effect.

[0038] It should be noted that the above-mentioned “in the direction along the middle of the distribution box 20 to the edge of the distribution box 20” refers to the middle to the edge in the second horizontal direction L2. Correspondingly, the above-mentioned “the slurry flow rate in the chute 42 has the characteristics of a large flow rate in the middle and a small flow rate on both sides”, “the middle” and “the two sides” also refer to the middle and the two sides in the second horizontal direction L2.

[0039] like Figure 1As shown, the delivery pipe 10 includes a delivery main pipe 11 and a plurality of delivery branches 12 connected to the delivery main pipe 11, and a plurality of distribution boxes 20, each of which is provided with a distribution box 20, each of which is connected to at least one distribution pipe 30, and each of which is provided with a flow valve 121. The plurality of delivery branches 12 can be arranged at intervals along the extension direction of the slurry feed pipeline 40 and add flocculants to the slurry feed pipeline 40, and add flocculants at multiple points, which can effectively ensure the flocculation effect. In addition, a flow valve 121 is provided on the delivery branch pipe 12, which can adjust the flocculant delivery amount in the delivery branch pipe 12 to optimize the distribution amount of the flocculant added to the slurry, and further ensure the flocculation effect.

[0040] Specifically, in this embodiment, three delivery branches 12 are connected to one delivery main pipe 11, each delivery branch pipe 12 is provided with a distribution box 20, and each distribution box 20 is connected with three distribution pipes 30. Specifically, the three delivery branches 12 are installed between the P-DUC device (the P-DUC device is a thickener supporting device, which can dilute the slurry, and the diluted slurry can be better mixed with the flocculant to ensure the flocculation effect) and the thickener feed well 50, and the three delivery branches 12 are arranged at equal intervals. The delivery branch pipe 12 is connected to the distribution box 20 through a delivery pipe flange, and the distribution pipe 30 is connected to the distribution box 20 through a distribution pipe flange. A plurality of distribution holes 31 are provided at the end of each distribution pipe 30, and the flocculant can be fully mixed with the slurry through the plurality of distribution holes 31, so that the flocculant solution can be continuously, evenly, quantitatively and smoothly added to the chute 42, ensuring that the flocculant solution can quickly play a flocculation effect, thereby accelerating the sedimentation rate of the slurry, improving the use efficiency of the flocculant solution, and achieving an ideal solid-liquid separation effect.

[0041] like Figure 1 As shown, the embodiment of the thickener feeding device of the present application includes a slurry feeding pipeline 40 and a flocculant adding device, and the flocculant adding device is the above-mentioned flocculant adding device. The above-mentioned flocculant adding device can effectively solve the problem of increasing production costs by excessively adding flocculants to ensure flocculation effect in the related art. The thickener dosing device with the above-mentioned flocculant adding device also has the above-mentioned advantages.

[0042] Another embodiment of the thickener feeding device of the present application includes a slurry feeding pipeline 40 and a flocculant adding device, the flocculant adding device is the above-mentioned flocculant adding device, a plurality of delivery branches 12 are arranged at intervals along the extension direction of the slurry feeding pipeline 40, each distribution pipe 30 extends into the slurry feeding pipeline 40, and in each of the two adjacent delivery branches 12, the flocculant delivery amount of the upstream delivery branch 12 is greater than the flocculant delivery amount of the downstream delivery branch 12. By adjusting the flocculant delivery amount in each delivery branch 12, the distribution amount of the flocculant added to the slurry can be optimized, thereby ensuring the flocculation effect. Specifically, the slurry feed pipeline 40 includes a feed pipe 41 and a chute 42, and a plurality of delivery branches 12 are arranged at intervals in the extension direction of the chute 42. The flocculant delivery amount in the delivery branch 12 corresponding to the upstream position of the chute 42 is large, and the flocculant delivery amount in the delivery branch 12 corresponding to the downstream position of the chute 42 is small (since the slurry has been mixed with the flocculant solution upstream, a relatively small amount of flocculant solution can be added downstream), so that the slurry and the coagulant solution are mixed step by step, the flocculation time is extended, and the consumption of the flocculant is reduced while ensuring the flocculation effect, which can effectively solve the problem of increasing production costs by excessively adding flocculants to ensure the flocculation effect in the related art. In addition, in this embodiment, the distribution pipe 30 directly extends into the interior of the slurry feed pipeline 40 (specifically, extends below the liquid surface line 421), so that the flocculant can be more fully mixed with the slurry, and the flocculation effect is better than the related art of adding the flocculant solution on the liquid surface of the slurry.

[0043] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flocculant adding device, characterized in that: include: A delivery pipe (10); A distribution box (20), the distribution box (20) comprising a top plate (21), a bottom plate (22), and a side plate (23) connected between the top plate (21) and the bottom plate (22), the top plate (21) being provided with an inlet, the bottom plate (22) being provided with an outlet, the inlet and the outlet being arranged at an interval in their projections in a horizontal plane, and the output end of the delivery pipe (10) being connected to the inlet; a distribution pipe (30) connected to the outlet; The top plate (21) has a first end and a second end in a first horizontal direction (L1), the bottom plate (22) has a first end and a second end in the first horizontal direction (L1), the first end of the top plate (21) is arranged corresponding to the first end of the bottom plate (22), the inlet is arranged at the first end of the top plate (21), and the outlet is arranged at the second end of the bottom plate (22); There are a plurality of distribution pipes (30), and the plurality of distribution pipes (30) are arranged at intervals along a second horizontal direction (L2), wherein the second horizontal direction (L2) is perpendicular to the first horizontal direction (L1); In a direction from the middle of the distribution box (20) to the edge of the distribution box (20), the lengths of the plurality of distribution pipes (30) gradually decrease; A flow partition (25) extending along the second horizontal direction (L2) is arranged in the distribution box (20); the flow partition (25) is located between the delivery pipe (10) and the distribution pipe (30) and is arranged close to the distribution pipe (30); the flow partition (25) is connected to both the bottom plate (22) and the side plate (23) and is spaced apart from the top plate (21).

2. The flocculant adding device according to claim 1, characterized in that: An aeration plate (24) is arranged in the distribution box (20), and the aeration plate (24) is located below the delivery pipe (10). In the direction from the delivery pipe (10) to the distribution pipe (30), the aeration plate (24) is arranged to be inclined downward.

3. The flocculant adding device according to claim 2, characterized in that: The angle between the aeration plate (24) and the horizontal plane is between 45° and 60°.

4. The flocculant adding device according to claim 1, characterized in that: The top of the flow divider (25) has a plurality of flow splitting teeth (251) arranged at intervals along the second horizontal direction (L2).

5. The flocculant adding device according to claim 1, characterized in that: The length difference between adjacent distribution pipes (30) is between 50 mm and 100 mm.

6. The flocculant adding device according to any one of claims 1 to 5, characterized in that: The delivery pipe (10) comprises a delivery main pipe (11) and a plurality of delivery branch pipes (12) connected to the delivery main pipe (11); there are a plurality of distribution boxes (20); each delivery branch pipe (12) is provided with a distribution box (20); each distribution box (20) is connected to at least one distribution pipe (30); and each delivery branch pipe (12) is provided with a flow valve (121).

7. A thickener feeding device, comprising a slurry feeding pipeline (40) and a flocculant adding device, characterized in that: The flocculant adding device is the flocculant adding device according to any one of claims 1 to 6.

8. A thickener feeding device, comprising a slurry feeding pipeline (40) and a flocculant adding device, characterized in that: The flocculant adding device is the flocculant adding device according to claim 6, wherein a plurality of the delivery branches (12) are arranged at intervals along the extension direction of the slurry feed pipeline (40), and each of the distribution pipes (30) extends into the slurry feed pipeline (40). In each of the two adjacent delivery branches (12), the flocculant delivery amount of the delivery branch (12) located upstream is greater than the flocculant delivery amount of the delivery branch (12) located downstream.

Images