Acid adding structure, flotation machine and phosphorite flotation system

Abstract

The utility model provides an acid adding structure, a flotation machine and a phosphorite flotation system, and relates to the technical field of flotation machines, the acid adding structure comprises a sulfuric acid conveying device, the sulfuric acid conveying device comprises a spray head and a conveying pipe, and the spray head is connected to the end, stretching into a flotation tank, of the conveying pipe; the stirrer comprises a stirring assembly which is used for stirring ore pulp in the flotation tank; wherein the spray heads are arranged on the peripheral side of the stirring assembly and used for spraying sulfuric acid conveyed by the conveying pipe to the stirring assembly, and the technical problem that in the prior art, when concentrated sulfuric acid is input into ore pulp in a pipeline direct insertion mode, the concentrated sulfuric acid cannot be effectively and rapidly dispersed is solved; the technical effect of reducing the scaling phenomenon caused by the reaction of the concentrated sulfuric acid and the ore pulp is achieved.

Description

Technical Field

[0001] This application relates to the technical field of flotation machines, and more particularly to an acid addition mechanism, a flotation machine, and a phosphate rock flotation system. Background Technology

[0002] For low-phosphorus, high-magnesium phosphate ore, the most commonly used flotation process is single reverse flotation or direct-reverse flotation to enrich the phosphate ore and remove magnesium-containing impurities. During the magnesium reduction process, fatty acid collectors are used, and phosphoric acid or sulfuric acid is used as inhibitors to bring the pulp to a suitable pH value to meet the needs of subsequent processes.

[0003] In the existing technology, considering factors such as production cost, safety and transportation convenience, most mineral processing enterprises directly use concentrated sulfuric acid as an inhibitor. The reverse flotation acid addition device generally uses steel pipe or composite material pipe, which is directly inserted into the flotation cell to add concentrated sulfuric acid. Through the stirring of the agitator, the concentrated sulfuric acid and the slurry are quickly and evenly mixed to adjust the pH value.

[0004] However, the technique of directly inserting pipes into the flotation cell has the following problems: when concentrated sulfuric acid comes into initial contact with the slurry, if the concentrated sulfuric acid cannot disperse quickly, a large amount of heat will be generated locally due to its concentration. At the same time, it reacts violently with the slurry, generating a variety of compounds such as calcium sulfate and calcium phosphate. This causes scaling in the flotation cell, changes the internal structure of the flotation cell, alters the flotation conditions, and affects the flotation results. Utility Model Content

[0005] The purpose of this application is to provide an acid addition structure, a flotation machine, and a phosphate rock flotation system to solve the technical problem in the prior art where concentrated sulfuric acid cannot be effectively and quickly dispersed when it is directly fed into the slurry through a pipeline.

[0006] To address the aforementioned technical problems, this application provides the following technical solutions:

[0007] The first aspect of this application provides an acid addition structure, which includes a sulfuric acid conveying device. The sulfuric acid conveying device includes a nozzle and a conveying pipe, with the nozzle connected to the end of the conveying pipe that extends into the flotation cell.

[0008] A mixer, including a stirring assembly, is used to stir the slurry in a flotation cell;

[0009] The nozzle is located on the periphery of the mixing assembly and is used to spray the sulfuric acid conveyed by the feed pipe toward the mixing assembly.

[0010] In some modified embodiments of the first aspect of this application, the nozzle is provided with a plurality of evenly distributed injection holes, and sulfuric acid in the feed pipe is injected into the impeller through the plurality of injection holes.

[0011] In some modified embodiments of the first aspect of this application, the sulfuric acid conveying device further includes a power unit and a storage tank, with a conveying pipe connecting the storage tank and the nozzle; the power unit is used to drive the sulfuric acid in the storage tank to be conveyed to the nozzle through the conveying pipe;

[0012] The conveying pipe includes a large-diameter pipe, a reducing pipe, and a small-diameter pipe. The reducing pipe connects the large-diameter pipe and the small-diameter pipe, and the output end of the small-diameter pipe is connected to the nozzle.

[0013] The reducing pipe has a tapered structure that is wider at the top and narrower at the bottom.

[0014] In some modified embodiments of the first aspect of this application, both the inner and outer walls of the conveying pipe are provided with anti-corrosion layers.

[0015] In some modified embodiments of the first aspect of this application, the stirrer further includes a connecting pipe, one end of which is connected to the top of the flotation cell and the other end is detachably connected to the flow guiding assembly;

[0016] The flow guiding component is located at the lower end of the central axis within the flotation cell, and there is a distance between it and the bottom of the flotation cell.

[0017] In some modified embodiments of the first aspect of this application, the stirring assembly includes a stirring shaft and a plurality of impellers mounted sequentially from bottom to top on the stirring shaft. Each impeller is provided with at least two guide vanes, and the periphery of the guide vanes forms a stirring zone.

[0018] In some modified embodiments of the first aspect of this application, there are multiple spray heads, and the orientation of the multiple spray heads corresponds to multiple stirring zones respectively.

[0019] In some modified embodiments of the first aspect of this application, the aperture is between 6mm and 8mm.

[0020] A second aspect of this application provides a flotation machine including an acid addition mechanism and an aeration mechanism as described above, wherein the aeration mechanism is disposed at the top of the flotation cell.

[0021] A third aspect of this application provides a phosphate rock flotation system, which includes the flotation machine described above.

[0022] Compared to existing technologies, the acid addition structure provided in this application, by placing an agitator inside the flotation cell, allows the agitator components to operate within the slurry after a certain amount of slurry is input into the flotation cell, causing the slurry to rotate. The closer the area is to the agitator, the stronger the agitation force. Therefore, this invention incorporates a feed pipe and a nozzle in the sulfuric acid conveying device. The nozzle is connected to the end of the feed pipe that extends into the flotation cell and continues to the periphery of the agitator components. Under the same pressure, the pressure of the liquid sprayed from the nozzle structure is much greater than the pressure generated by the direct pipeline conveying method in existing technologies. This ensures that the sulfuric acid in the feed pipe has sufficient impact force to be sprayed towards the agitator components and rapidly decomposes in the area with strong agitation force near the agitator components. This rapidly reduces the density of concentrated sulfuric acid, decreasing the heat generated by the high sulfuric acid concentration and thus reducing the probability of scaling in the flotation cell, thereby extending the service life of the equipment.

[0023] Secondly, this utility model provides a flotation machine that, by setting an aeration mechanism at the top of the flotation cell, injects air into the slurry to quickly generate foam and carry impurities into the foam, thereby increasing the overall foam generation speed. Combined with the acid addition structure of the first aspect, it can improve flotation efficiency and reduce product loss.

[0024] Thirdly, this utility model also provides a phosphate rock flotation system, including the flotation machine described above, the principle of which has been described above and will not be repeated here. Attached Figure Description

[0025] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0026] Figure 1 A schematic diagram illustrating the internal workings of the acid-addition structure is shown.

[0027] Figure 2 A schematic diagram of the internal structure of the feed pipe in the acid addition mechanism is shown.

[0028] Figure 3 A schematic diagram of the agitator in the acid addition mechanism is shown.

[0029] Explanation of icon numbers:

[0030] 10 - Flotation cell; 20 - Gas supply mechanism;

[0031] 100 - Sulfuric acid conveying device; 110 - Conveying pipe; 111 - Large diameter pipe; 112 - Reducing pipe; 113 - Small diameter pipe; 114 - Anti-corrosion coating; 120 - Nozzle; 121 - Spray hole;

[0032] 200-Agitator; 210-Agitator assembly; 211-Agitator shaft; 212-Impeller; 213-Guide vane; 220-Connecting pipe; 230-Flange. Detailed Implementation

[0033] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application. This application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0034] These embodiments are provided to make the application thorough and complete, and to fully express the scope of the application to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​illustrated in these embodiments should be interpreted as merely exemplary and not as limiting.

[0035] It should be noted that, in the description of this application, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] Furthermore, the terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0037] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0038] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0039] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0040] Example 1

[0041] The main problem addressed and the technical solution principle of this embodiment are as follows:

[0042] Firstly, to accelerate the rapid dispersion of concentrated sulfuric acid in the slurry and avoid excessively high local sulfuric acid concentrations that could lead to violent reactions with the slurry, forming calcium carbonate and causing scaling, this embodiment employs two methods: firstly, increasing the pressure at which concentrated sulfuric acid enters the slurry, thereby increasing its diffusion rate; and secondly, limiting the area within the slurry where concentrated sulfuric acid enters, ensuring it directly enters a strongly agitated zone. This external force accelerates the diffusion of concentrated sulfuric acid, significantly reducing the chemical reaction between the slurry and concentrated sulfuric acid.

[0043] Secondly, in the flotation process of low-phosphorus and high-magnesium phosphate ore, the pipe fittings in the acid addition structure are consumables and need to be replaced at certain intervals. According to on-site statistics, under the direct pipeline acid addition method, the service life of the acid addition pipe is 3 months. Meanwhile, the 16m... 3 The flotation cell 10 requires approximately two days of cleaning work by three people. Therefore, to reduce the labor intensity of cleaning personnel, this embodiment improves the installation method of the nozzles 120 and agitators 200 inside the flotation cell 10 by making them detachable. This achieves the technical effect of significantly reducing scaling inside the flotation cell 10 while greatly reducing the labor intensity of cleaning personnel. According to on-site statistics, under the improved acid addition structure, the service life of the acid addition components is extended to 6 months, and the 16m 3It takes about two people a day to clean the 10 flotation cells.

[0044] Reference Appendix Figure 1 Embodiment 1 of this utility model proposes an acid addition structure, which includes: a sulfuric acid conveying device 100, the sulfuric acid conveying device 100 including a nozzle 120 and a conveying pipe 110, the nozzle 120 being connected to the end of the conveying pipe 110 extending into the flotation cell 10;

[0045] Agitator 200 includes agitation component 210, which is used to agitate the slurry in flotation cell 10.

[0046] The nozzle 120 is located on the periphery of the stirring assembly 210 and is used to spray the sulfuric acid conveyed by the conveying pipe 110 toward the stirring assembly 210.

[0047] Specifically, the acid addition structure provided in this embodiment involves placing the agitator 200 inside the flotation cell 10. When a certain amount of slurry is input into the flotation cell 10, the agitator component 210 in the agitator 200 operates within the slurry, causing the slurry to rotate. The closer the area is to the agitator 200, the stronger the agitation force it experiences. Therefore, this invention provides a conveying pipe 110 and a nozzle 120 in the sulfuric acid conveying device 100. The nozzle 120 is connected to the end of the conveying pipe 110 that extends into the flotation cell 10, and continues to extend along with the conveying pipe 110 until... On the periphery of the stirring assembly 210, under the same pressure, the pressure of the liquid sprayed by the nozzle 120 structure is much greater than the pressure generated by the direct pipeline transportation method in the prior art. Therefore, it can ensure that the sulfuric acid in the conveying pipe 110 has sufficient impact force to be sprayed towards the stirring assembly 210, and rapidly decomposed in the area with strong stirring force near the stirring assembly 210, so that the concentration of concentrated sulfuric acid is rapidly reduced, reducing the heat generated by the high concentration of sulfuric acid, thereby reducing the probability of scaling in the flotation cell 10, and achieving the technical effect of improving the service life of the equipment.

[0048] The following improvements have been made to the sulfuric acid conveying device 100 to increase the sulfuric acid output speed:

[0049] Further, see attached document. Figure 1 In specific implementation, the nozzle 120 is provided with multiple evenly distributed injection holes 121, and the sulfuric acid in the feed pipe 110 is injected into the impeller 212 through the multiple injection holes 121.

[0050] Furthermore, the aperture is between 6-8 mm, and the spacing between adjacent injection holes 121 is between 10-15 mm.

[0051] Specifically, in order to improve the structure of the nozzle 120 and enable the sulfuric acid to have a sufficient spray speed, the technical solution adopted in this utility model is that the nozzle 120 is provided with multiple evenly distributed spray holes 121. The number and diameter of the holes are set according to the amount of acid added and the distance of the nozzle 120 relative to the stirring element, and the impact force of the sulfuric acid spraying is increased by utilizing the pressure principle.

[0052] Preferably, 16m 3 Taking a flotation cell as an example, when the aperture of the injection hole 121 is set between 6mm and 8mm, the impact force of sulfuric acid on the slurry can reach between 0.18MP and 0.22MP. Furthermore, by setting the position between the nozzle 120 and the agitator 200, the nozzle 120 can directly spray concentrated sulfuric acid onto the periphery of the agitator 200, thereby accelerating the diffusion rate of the concentrated sulfuric acid and ensuring its uniform distribution within the slurry. According to statistics: before using the technical solution of this embodiment, a 16m... 3 The traditional flotation cell requires approximately three people to clean for two days; and when using carbon steel, ordinary stainless steel, or polyethylene pipes as acid-adding pipes, the service life is only three months, meaning the acid-adding pipes need to be replaced every three months, and the flotation cell needs to be cleaned once every three months. However, after using the technical solution of this embodiment, the pH control of the reverse flotation cell is stable, and there is no obvious scaling in the first three months. Only routine cleaning is required every six months, and the cleaning workload is about one day for two people, which is significantly reduced compared to before. Therefore, it greatly reduces the labor intensity of the staff, extends the service life of the equipment, and reduces the equipment maintenance cost.

[0053] Further, see attached document. Figure 2 In a specific implementation, the sulfuric acid conveying device 100 also includes a power unit and a storage tank, and the conveying pipe 110 is connected between the storage tank and the nozzle 120; the power unit is used to drive the sulfuric acid in the storage tank to be conveyed to the nozzle 120 through the conveying pipe 110.

[0054] The conveying pipe 110 includes a large-diameter pipe 11, a reducing pipe 112 and a small-diameter pipe 113. The reducing pipe 112 is connected between the large-diameter pipe 11 and the small-diameter pipe 113. The output end of the small-diameter pipe 113 is connected to the nozzle 120.

[0055] The reducing tube 112 has a tapered structure that is wider at the top and narrower at the bottom.

[0056] Specifically, in order to achieve the technical effect of increasing the output pressure of sulfuric acid from the structure of the conveying pipe 110, the technical solution adopted by this utility model is to set the conveying pipe 110 into a structure in which a large-diameter pipe 11, a variable-diameter pipe 112 and a small-diameter pipe 113 are connected. Under the action of the power component, the sulfuric acid in the storage tank is input from the large-diameter pipe 11, and the flow area is gradually reduced through the variable-diameter pipe 112. Under the premise of constant power, the pressure of sulfuric acid in the small-diameter pipe 113 gradually increases.

[0057] It should be noted that the power components can be hydraulic pumps or other power-driven elements.

[0058] Further, see attached document. Figure 2 In practice, both the inner and outer walls of the conveying pipe 110 are provided with an anti-corrosion layer 114.

[0059] Specifically, in order to achieve the corrosion protection of the conveying pipe 110 relative to sulfuric acid, the technical solution adopted in this utility model is that concentrated sulfuric acid, due to its strong oxidizing properties, will form an oxide film on the surface of metals such as iron, thereby preventing metal corrosion. Therefore, concentrated sulfuric acid can be transported by metal pipes such as iron. However, dilute sulfuric acid will react with metals such as iron and corrode the pipes, and cannot be transported by metal pipes. Based on the above principle, the pipe body of the conveying pipe 110 is made of carbon steel as the skeleton, and the inner lining and outer sheath are made of polytetrachloroethylene. The material has sufficient strength to resist the effects of temperature and stirring and has good corrosion resistance.

[0060] The technical solution for increasing the stirring force of sulfuric acid based on stirrer 200 is as follows:

[0061] Further, see attached document. Figure 1 The agitator 200 includes an impeller 212 and guide vanes 213 disposed on the impeller 212. The function of the guide vanes 213 is to generate swirling flow in the flotation cell 10, thereby accelerating the fusion of sulfuric acid and the ore. According to force analysis, the ore is driven by the impeller 212 during the agitation process. Therefore, the more the ore is towards the impeller 212, the greater its fluidity. Thus, by placing the nozzle 120 near the impeller 212, the sulfuric acid can receive the maximum agitation force at the beginning of its entry into the ore, thereby increasing the diffusion rate of sulfuric acid.

[0062] To improve efficiency when replacing acid-filling components, the technical solution provided in this embodiment is as follows:

[0063] Further, see attached document. Figure 1 In a specific implementation, the stirrer 200 also includes a connecting pipe 220, one end of which is connected to the top of the flotation cell 10, and the other end is detachably connected to the stirring assembly 210.

[0064] The stirring assembly 210 is located at the central axis and lower end of the flotation cell 10, and there is a distance between it and the bottom of the flotation cell 10.

[0065] The connecting pipe 220 can be detachably connected to the top of the flotation cell 10 and the stirring assembly 210 via the flange 230. At the same time, the connection between the feed pipe 110 and the nozzle 120 is also via the flange 230. This method is simple to assemble and disassemble, technically mature, easy to train, and reduces the labor intensity of the workers. Meanwhile, the stirring assembly 210 is located at the lower end of the central axis in the flotation cell 10 and is spaced from the bottom of the flotation cell 10. This position is more in line with the flotation requirements of the slurry.

[0066] Furthermore, since the intense reaction between concentrated sulfuric acid and the slurry locally generates heat of reaction, this heat can damage the original sulfuric acid conveying pipe. However, due to the improved dispersion rate of sulfuric acid when it enters the slurry in this application, the service life of the sulfuric acid conveying pipe 110 is also greatly extended.

[0067] According to actual on-site testing, due to the significant reduction in scaling in the flotation cell 10 and the improved ease of connection between components, the cleaning cycle in the flotation cell 10 has been increased from once every 3 months to once every 6 months, and the working time has been reduced from 3 people and 2 days to 2 people and 1 day.

[0068] Secondly, such as Figure 1 As shown, this embodiment also provides a flotation machine, including the acid addition mechanism described above.

[0069] Specifically, in order to further enhance the speed of pulp pH adjustment, in this embodiment, the aeration mechanism 20 is set at the top of the flotation cell 10. The aeration mechanism 20 is used to inject air into the pulp, so that it can quickly generate foam and carry impurities into the foam, thereby increasing the speed of foam generation. At the same time, combined with the acid addition structure in the first aspect, it can improve flotation efficiency and reduce product loss.

[0070] The specific process flow is as follows:

[0071] a) The raw phosphate ore is crushed and ball-milled to obtain phosphate ore particles;

[0072] b) The phosphate rock particles are mixed with water in the flotation cell 10 of the flotation machine to obtain a pre-mixed slurry;

[0073] c) The pH of the pre-treated pulp is adjusted to acidic using an acidification mechanism;

[0074] d) Add magnesium removal collector to the pre-treated slurry after step c);

[0075] e) Inject air into the pre-treated slurry after step d), and then start the air valve of the flotation machine to perform flotation frothing, obtaining product concentrate and tailings froth respectively.

[0076] Thirdly, this embodiment also provides a phosphate rock flotation system, including the flotation machine described above. The effective integration of the flotation machine with the acid addition structure is achieved by wrapping the steel frame of the feed pipe 110 with corrosion-resistant material, ensuring the strength of the equipment. Simultaneously, considering the heat of reaction of sulfuric acid during dilution and contact with the slurry, the orifice diameter of the acid addition pipe is calculated to ensure that the acid in the acid adder is injected into the flotation cell 10 in the form of a jet. The jetting position is located near the agitator 200 inside the flotation cell 10, enabling rapid dispersion of the sulfuric acid and effectively protecting against thermal effects (deformation) on the acid adder. The acid adder and the sulfuric acid pipe are connected by a flange 230, making inspection and replacement convenient.

[0077] This design not only solves the problems of easy damage to the acid adder and easy scaling in the flotation cell 10, but also is easy to operate and highly practical. It has a wide range of applications, especially in mineral processing or phosphoric acid production where sulfuric acid needs to be added.

[0078] Example 2

[0079] This embodiment is an improvement to the agitator 200 in the flotation cell 10, to increase the agitation area of ​​the agitator 200, thereby making the sulfuric acid more evenly distributed in the ore. The technical solution is as follows:

[0080] Further, see attached document. Figure 3 The stirring assembly 210 includes a stirring shaft 211 and multiple impellers 212 mounted sequentially from bottom to top on the stirring shaft 211. Each impeller 212 is provided with at least two guide vanes 213. The guide vanes 213 rotate under the drive of the connected impellers 212 to form a strong stirring zone.

[0081] Furthermore, there are multiple nozzles, and the orientation of each nozzle corresponds to a multiple strong stirring zone.

[0082] By sequentially arranging multiple impellers 212 and matching guide vanes 213 from bottom to top on the stirring shaft 211, not only can the stirring area of ​​the slurry be increased, but also the guide vanes 213, which are arranged vertically relative to each other, can perform transverse shear cutting on the interior of the slurry, further improving the rotation efficiency of the impellers 212. At the same time, by setting multiple spray heads in their respective strong stirring zones through the conveying pipe 110, the sprayed sulfuric acid can be dispersed in the first instance under the action of the guide vanes 213, accelerating the dispersion speed of sulfuric acid when it enters the magma.

[0083] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An acid-structured, characterized in that, The acid feeding structure is arranged in a flotation tank, comprising: a sulfuric acid feeding device, which comprises a spray head and a feeding pipe, the spray head being connected to the end of the feeding pipe extending into the flotation tank; a stirrer, which comprises a stirring assembly for stirring the ore pulp in the flotation tank; wherein: the spray head is arranged on the side of the stirring assembly, and the spray head is used to spray the sulfuric acid fed by the feeding pipe towards the stirring assembly.

2. The acid-adding structure of claim 1, wherein The spray head is provided with a plurality of uniformly distributed spray holes, and the stirring assembly comprises an impeller, and the sulfuric acid in the feeding pipe is sprayed towards the impeller through the plurality of spray holes.

3. The acid-adding structure of claim 2, wherein The sulfuric acid feeding device further comprises a power member and a storage tank, and the feeding pipe is connected between the storage tank and the spray head; the power member is used to drive the sulfuric acid in the storage tank to be fed to the spray head through the feeding pipe. The feeding pipe comprises a large-diameter pipe, a variable-diameter pipe and a small-diameter pipe, the variable-diameter pipe being connected between the large-diameter pipe and the small-diameter pipe, and the output end of the small-diameter pipe being connected to the spray head; The variable-diameter pipe has a tapered structure with a wide upper part and a narrow lower part.

4. The acidified structure of claim 1, wherein, The inner wall and the outer wall of the feeding pipe are both provided with a corrosion-resistant layer.

5. The acid-adding structure of claim 3, wherein The stirrer further comprises a connecting pipe, one end of the connecting pipe being connected to the top of the flotation tank, and the other end of the connecting pipe being detachably connected to the stirring assembly. The stirring assembly is arranged at the position of the central axis of the flotation tank and at the lower end, and there is a distance between the stirring assembly and the bottom of the flotation tank.

6. The acid-adding structure of claim 5, wherein The stirring assembly comprises a stirring shaft and a plurality of impellers installed on the stirring shaft from bottom to top, and each of the impellers is provided with at least two guide vanes, the guide vanes rotating under the driving of the connected impeller to form a strong stirring zone.

7. The acid-adding structure of claim 6, wherein The spray head is a plurality of, and the orientations of the plurality of spray heads correspond to the plurality of strong stirring zones respectively.

8. The acid-adding structure of claim 2, wherein The aperture of the spray hole is between 6mm and 8mm.

9. A flotation machine characterized in that The acid feeding structure and the air feeding mechanism are arranged on the top of the flotation tank.

10. A phosphate ore flotation system characterized by, The flotation machine comprises the acid feeding structure according to any one of claims 1-8 and the air feeding mechanism arranged on the top of the flotation tank. The flotation machine comprises the acid feeding structure according to claim 9.

Images