Rapid thickening system for laterite-nickel ore pulp

Abstract

The invention discloses a laterite-nickel ore pulp rapid thickening system which comprises a thickener body and a material pressing mechanism, and the thickener body is provided with a conical containing cavity; the material pressing mechanism comprises a lifting assembly and a sieve plate, sieve holes are evenly formed in the sieve plate, the movable end of the lifting assembly is connected with the sieve plate and used for driving the sieve plate to ascend and descend, so that the sieve plate has the highest state higher than the liquid level and the lowest state reaching the lower middle portion of the thickener body, and a plurality of pipelines are arranged on the sieve plate. A plurality of liquid spraying holes are formed in the pipeline and are used for spraying a flocculating agent. According to the laterite-nickel ore pulp rapid thickening system provided by the invention, a flocculating agent is uniformly sprayed into the thickener body through a pipeline on a sieve plate on the material pressing mechanism and liquid spraying holes in the pipeline, so that particles are in full contact with the flocculating agent and are agglomerated, the particles are pushed to descend through the sieve plate on the material pressing mechanism, and the sedimentation and thickening of the particles are accelerated; the thickening efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laterite nickel ore slurry thickening, and in particular to a laterite nickel ore slurry rapid thickening system. Background Art

[0002] The thickener is a solid-liquid separation device based on gravity sedimentation, usually a cylindrical shallow trough with a conical bottom. The slurry with a solid weight of 10% to 20% can be concentrated into an underflow slurry with a solid content of 45% to 55% by gravity sedimentation. With the help of a rake installed in the thickener and running slowly (1 / 3 to 1 / 5 r / min), the thickened underflow slurry is discharged from the underflow port at the bottom of the thickener. A relatively clean supernatant (overflow) is produced at the top of the thickener and discharged from the annular chute at the top. For example, Chinese patent CN202380012340.3 discloses a laterite nickel ore slurry thickener, including a thickener body and a pressing mechanism; the thickener body has a conical accommodating chamber, the accommodating chamber is used to pass the slurry, the bottom end of the thickener body is provided with a discharge port, and the upper end of the thickener body is provided with an overflow port.

[0003] The above-mentioned prior art still has the following problems: the thickener used in the hydrometallurgy of laterite nickel ore only concentrates the slurry by gravity, which usually takes a long time and has a low concentration efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a rapid thickening system for laterite nickel ore slurry to solve the technical problems that the thickeners used in the hydrometallurgy of laterite nickel ore in the prior art only concentrate the slurry by gravity, which usually results in a long concentration time and low concentration efficiency.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a laterite nickel ore slurry rapid thickening system, comprising: a thickener body having a tapered accommodating cavity; and The material pressing mechanism includes a lifting assembly and a sieve plate. The sieve plate is evenly and densely provided with sieve holes. The movable end of the lifting assembly is connected to the sieve plate to drive the sieve plate to rise and fall so that it reaches the highest state above the liquid surface and the lowest state reaching the middle and lower part of the thickener body. A plurality of pipes are provided on the sieve plate, and a plurality of liquid spray holes are provided on the pipes for spraying flocculants.

[0006] In some embodiments, a cylindrical flow stabilizing cylinder is provided in the accommodating chamber, and a feed pipe connected to the flow stabilizing cylinder is provided on the thickener body.

[0007] In some embodiments, the sieve plate includes an inner sieve plate, the outer diameter of the inner sieve plate is smaller than the inner diameter of the flow stabilizing cylinder, and the inner sieve plate is lifted and lowered in the inner circular area of ​​the flow stabilizing cylinder under the drive of the lifting assembly.

[0008] In some embodiments, the sieve plate further includes an outer sieve plate, which is provided with a through opening, the inner diameter of the through opening being larger than the outer diameter of the flow stabilizing cylinder, and is driven by the lifting assembly to rise and fall in the outer area of ​​the flow stabilizing cylinder.

[0009] In some embodiments, the outer sieve plate is provided with an opening corresponding to the position of the feed pipe.

[0010] In some embodiments, the sieve plate is conical in shape.

[0011] In some embodiments, a scraper is also included, which includes a rotatable main shaft and a scraper assembly in contact with the inner wall of the thickener body. The scraper assembly is connected to the main shaft and is used to rotate and scrape off the slurry attached to the inner wall of the thickener body. The screen plate is mounted on the main shaft, and the main shaft is used to guide the moving direction of the screen plate.

[0012] In some embodiments, a platform is provided on the thickener body, the bottom of the platform is higher than the highest state of the sieve plate above the liquid level, and a driving mechanism for driving the main shaft to rotate is installed on the platform.

[0013] In some embodiments, the lifting assembly includes a plurality of hoists, which are distributed circumferentially on the platform, and the movable ends of the hoists are connected to the screen plate.

[0014] In some embodiments, a liquid supply pipe is provided at the end of the pipeline, and the liquid supply pipe is connected to the movable end of the hoist through a bracket.

[0015] Compared with the existing technology, the rapid thickening system for laterite nickel ore slurry provided by the present invention sprays the flocculant evenly inside the thickener body through the pipes on the sieve plate on the pressing mechanism and the spray holes thereon, so that the particles are fully in contact with the flocculant, and the sieve plate on the pressing mechanism pushes the particles down, accelerates the sedimentation and thickening of the particles, and improves the thickening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a position where the sieve plate of the laterite nickel ore slurry rapid thickening system provided by an embodiment of the present invention is lifted above the liquid surface; Figure 2 This is a schematic structural diagram of the position of the sieve plate of the laterite nickel ore slurry rapid thickening system provided by an embodiment of the present invention, which is about to be below the liquid surface; Figure 33D schematic diagram of the inner sieve plate and the outer sieve plate of the laterite nickel ore slurry rapid thickening system provided by an embodiment of the present invention; Figure 4 It is a three-dimensional elevation diagram of the inner and outer sieve plates of the laterite nickel ore slurry rapid thickening system provided by an embodiment of the present invention.

[0017] Description of reference numerals: 1. Thickener body; 101. Accommodation chamber; 102. Flow stabilizer; 103. Feed pipe; 2. Material pressing mechanism; 21. Lifting assembly; 211. Hoist; 22. Sieve plate; 221. Inner sieve plate; 222. Outer sieve plate; 2221. Through port; 2222. Open port; 201. Sieve hole; 202. Pipeline; 203. Liquid spray hole; 204. Liquid supply pipe; 3. Scraper; 31. Main shaft; 32. Scraper assembly; 33. Driving mechanism; 4. Platform; DETAILED DESCRIPTION In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In order to solve the technical problem that the thickener used in the hydrometallurgy of laterite nickel ore only concentrates the slurry by gravity, which usually takes a long time and has low concentration efficiency, the present invention provides a laterite nickel ore slurry rapid thickening system, which can realize the rapid thickening of the slurry by the thickener in the hydrometallurgy of laterite nickel ore.

[0019] It should be noted that the laterite-nickel ore slurry rapid thickening system described in the present invention is used for but not limited to laterite-nickel ore hydrometallurgical process. For the convenience of explanation, in the present invention, only the application of the laterite-nickel ore slurry rapid thickening system to the laterite-nickel ore hydrometallurgical process is taken as an example for explanation. The principle of applying the laterite-nickel ore slurry rapid thickening system to other industrial production is essentially the same as the principle of applying it to the laterite-nickel ore hydrometallurgical process, and they will not be described one by one here.

[0020] See also Figure 1-4The present invention provides a system for rapid thickening of laterite nickel ore slurry, comprising a thickener body 1 and a pressing mechanism 2. The thickener body 1 has a conical accommodating chamber 101 in which the slurry is thickened. The pressing mechanism 2 comprises a lifting assembly 21 and a sieve plate 22. The sieve plate 22 is uniformly and densely provided with sieve holes 201. The movable end of the lifting assembly 21 is connected to the sieve plate 22 for driving the sieve plate 22 to rise and fall, so that the sieve plate 22 reaches its highest state above the liquid level and its lowest state at the middle and lower part of the thickener body 1. When the sieve plate 22 moves from top to bottom, the larger particles after flocculation and agglomeration are intercepted below the sieve plate 22, while the smaller particles that have not yet agglomerated pass through. The sieve holes 201 thereon continue to flocculate. As the sieve plate 22 moves downward, particles that have been flocculated to a suitable size can be pressed downward from the numerous particles, allowing them to settle quickly. Particles that have not been flocculated to a suitable size pass through the sieve plate 22, preventing the sieve plate 22 from pushing them to the bottom and continuing to flocculate in the upper section of the accommodating chamber 101. When the sieve plate 22 moves up and down, it also stirs the slurry, promoting full contact between the flocculant and the fine particles in the slurry and improving particle agglomeration. In addition, when the sieve plate 22 moves from bottom to top to above the liquid surface, the particles will flow downward from the top of the sieve plate 22 with the fluid, avoiding being retained on the upper surface of the sieve plate 22. The sieve plate 22 is provided with a plurality of pipes 202, and the pipes 202 are provided with a plurality of spray holes 203 for spraying flocculants. The pipes 202 are used to connect to the flocculant supply pipe, and the flocculants are sprayed upward from the spray holes 203 so that the flocculants are evenly sprayed inside the thickener body, so that the particles are fully in contact with the flocculants, thereby improving the flocculation efficiency.

[0021] In this embodiment, the sieve plate 22 is in the shape of a cone, and the outer diameter of the cone gradually decreases from top to bottom. The conical upper surface facilitates the fluid to flow downward to all sides when it rises above the liquid surface, generating a relatively large flow rate.

[0022] It is understandable that the sieve plate 22 can be flat and the above technical effects can also be achieved. However, when the sieve plate 22 is conical in shape, the fluid flows downward faster, the impulse generated by the fluid is greater, and the more effectively it can drive the particles above to flow downward.

[0023] It should be noted that, in one embodiment, the flow stabilizing tube 102 is not installed in the middle of the accommodating chamber 101, and a whole sieve plate 22 is used for lifting and lowering, which has a large coverage area and good integrity.

[0024] In one embodiment, see Figure 1 and Figure 2In order to provide a steady flow effect when the slurry is injected, a cylindrical steady flow tube 102 is provided in the accommodating chamber 101 for stabilizing the flow of the injected slurry. The steady flow tube 102 can help control the flow state of the slurry entering the center of the thickener, ensuring that the slurry can be evenly distributed at the bottom of the entire thickener, thereby improving the sedimentation effect of solid particles. A feed pipe 103 connected to the steady flow tube 102 is provided on the thickener body 1 for passing the slurry into the steady flow tube 102.

[0025] In one embodiment, see Figures 1 to 4 In order to effectively improve the thickening efficiency under the setting of the flow stabilizing cylinder 102, the screen plate 22 includes an inner screen plate 221. The outer diameter of the inner screen plate 221 is smaller than the inner diameter of the flow stabilizing cylinder 102, and is driven by the lifting component 21 to rise and fall in the inner circle area of ​​the flow stabilizing cylinder 102, thereby injecting the slurry area inside the flow stabilizing cylinder 102 to accelerate the sinking of the flocculation particles, and evenly injecting flocculants therein.

[0026] In one embodiment, see Figures 1 to 4 In order to accelerate the sinking speed of particles flocculated to a suitable size both inside and outside the stabilizing cylinder 102, the sieve plate 22 also includes an outer sieve plate 222. A through-hole 2221 is provided on the outer sieve plate 222. The inner diameter of the through-hole 2221 is larger than the outer diameter of the stabilizing cylinder 102. Driven by the lifting component 21, the through-hole 2221 is lifted and lowered in the outer area of ​​the stabilizing cylinder 102, thereby accelerating the sinking of flocculated particles in the outer area of ​​the stabilizing cylinder 102, and auxiliary flocculant is also injected on its outer side to expand the flocculant injection range.

[0027] It can be understood that, since the sieve plate 22 performs the lifting movement, the flocculant can be injected in a covering manner from top to bottom, which results in a better flocculation effect of the flocculant.

[0028] The outer sieve plate 222 is provided with an opening 2222 corresponding to the position of the feed pipe 103 , so as to avoid interference between the lifting action and the feed pipe 103 .

[0029] It can be understood that the opening 2222 is not limited to one, and a corresponding opening can be provided for other parts that may interfere with the lifting and lowering of the external sieve plate 222 to pass through.

[0030] In one embodiment, see Figure 1 and Figure 2In order to guide the lifting and lowering of the screen plate 22 and improve its lifting stability, a scraper 3 is also included, which includes a rotatable main shaft 31 and a scraper assembly 32 in contact with the inner wall of the thickener body 1. The scraper assembly 32 is a rake, which is connected to the main shaft 31 and is used to rotate and scrape off the slurry attached to the inner wall of the thickener body 1. The screen plate 22 is sleeved on the main shaft 31, and the main shaft 31 is used to guide the moving direction of the screen plate 22.

[0031] It can be understood that when the flow stabilizing cylinder 102 is not provided, the main shaft 31 has a lifting and guiding effect on the entire sieve plate 22; when the flow stabilizing cylinder 102 is provided, the main shaft 31 has a lifting and guiding effect on the inner sieve plate 221. Furthermore, the through opening 2221 on the outer sieve plate 222 can be matched with the outer cylindrical surface of the flow stabilizing cylinder 102, and the flow stabilizing cylinder 102 is used as a guide member to guide the lifting and lowering to improve its stability. In this embodiment, the outer surface of the flow stabilizing cylinder 102 needs to be set to a straight cylindrical shape to allow the outer sieve plate 222 to slide smoothly relative to it.

[0032] In one embodiment, see Figure 1 and Figure 2 In order to prevent the operating platform on the thickener body 1 from interfering with the lifting of the sieve plate 22 above the liquid level, a platform 4 is provided on the thickener body 1. The bottom of the platform 4 is higher than the highest state of the sieve plate 22 above the liquid level. A driving mechanism 33 for driving the main shaft 31 to rotate is installed on the platform 4. The driving mechanism 33 can adopt an electric motor and a reducer, and its output shaft is connected to the main shaft 31 to drive it to rotate.

[0033] Furthermore, in order to lift and lower the screen plate 22, the lifting assembly 21 includes several cranes 211, which are distributed in a circular shape on the platform 4, and the movable ends of the cranes 211 are connected to the screen plate 22. The cranes 211 move the hook or sling up and down through a drum, wire rope, chain or other similar devices, and the hook or sling is fixedly connected to the lifting ring on the screen plate 22.

[0034] It can be understood that there are four hoists 211, which are distributed in a circular pattern, so that the lifting points of the screen plate 22 are evenly distributed, making the lifting more stable; when the screen plate 22 descends, it mainly uses its own weight to sink. During the descent process, the main role of the hoist 211 is to prevent the screen plate 22 from sinking too quickly and to control its sinking speed.

[0035] Furthermore, a liquid supply pipe 204 is provided at the end of the pipeline 202, and the liquid supply pipe 204 is connected to the movable end of the hoist 211 through a bracket. The liquid supply pipe 204 is connected and communicated with the corresponding flocculant liquid tank through a pump body, and is used to supply flocculant. The liquid supply pipe 204 is connected to the movable end of the hoist 211 through a bracket, which makes it easy for it to rise and fall along with the lifting.

[0036] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail: the lifting component 21 drives the sieve plate 22 to rise and fall, with the highest state being at a high liquid level and the lowest state reaching the middle and lower part of the thickener body 1. During the downward movement, the particles that have been flocculated to a suitable size are pressed downward from the numerous particles, and can be quickly settled, thereby increasing the thickening speed; during the lifting and lowering process of the sieve plate 22, the spray holes 203 on the upper pipe 202 spray flocculant into the inside of the thickener, and the flocculant is injected into the accommodating chamber 101 from the middle and lower part to the upper part, with a larger coverage range and penetration depth, so that the flocculant is evenly sprayed inside the thickener body, so that the particles are fully in contact with the flocculant, thereby improving the flocculation efficiency.

[0037] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A laterite nickel ore slurry rapid thickening system, characterized in that: include: A thickener body, the thickener body having a conical accommodating cavity; as well as The material pressing mechanism includes a lifting assembly and a sieve plate. The sieve plate is evenly provided with sieve holes. The movable end of the lifting assembly is connected to the sieve plate to drive the sieve plate to rise and fall so that it reaches the highest state above the liquid surface and the lowest state reaching the middle and lower part of the thickener body. A plurality of pipes are provided on the sieve plate, and a plurality of liquid spray holes are provided on the pipes for spraying flocculants.

2. The laterite nickel ore slurry rapid thickening system according to claim 1, characterized in that: A cylindrical flow stabilizing cylinder is provided in the accommodating chamber, and a feed pipe connected to the flow stabilizing cylinder is provided on the thickener body.

3. The laterite nickel ore slurry rapid thickening system according to claim 2, characterized in that: The sieve plate comprises an inner sieve plate, the outer diameter of which is smaller than the inner diameter of the flow stabilizing cylinder, and the inner sieve plate is driven by the lifting assembly to rise and fall in the inner circle area of ​​the flow stabilizing cylinder.

4. The laterite nickel ore slurry rapid thickening system according to claim 3, characterized in that: The sieve plate further comprises an outer sieve plate, which is provided with a through opening. The inner diameter of the through opening is larger than the outer diameter of the flow stabilizing cylinder, and the through opening is lifted and lowered in the outer area of ​​the flow stabilizing cylinder under the drive of the lifting assembly.

5. The laterite nickel ore slurry rapid thickening system according to claim 4, characterized in that: The outer sieve plate is provided with an opening corresponding to the position of the feed pipe.

6. The laterite nickel ore slurry rapid thickening system according to claim 1, characterized in that: The sieve plate is in a conical shape.

7. The laterite nickel ore slurry rapid thickening system according to claim 1, characterized in that: It also includes a scraper, which includes a rotatable main shaft and a scraper assembly in contact with the inner wall of the thickener body. The scraper assembly is connected to the main shaft and is used to rotate and scrape off the slurry attached to the inner wall of the thickener body. The screen plate is mounted on the main shaft, and the main shaft is used to guide the moving direction of the screen plate.

8. The laterite nickel ore slurry rapid thickening system according to claim 7, characterized in that: A platform is provided on the thickener body, the bottom of the platform is higher than the highest state of the sieve plate above the liquid level, and a driving mechanism for driving the main shaft to rotate is installed on the platform.

9. The laterite nickel ore slurry rapid thickening system according to claim 8, characterized in that: The lifting assembly includes a plurality of hoists, which are distributed in a circumferential manner on the platform, and the movable ends of the hoists are connected to the screen plate.

10. The laterite nickel ore slurry rapid thickening system according to claim 9, characterized in that: A liquid supply pipe is provided at the end of the pipeline, and the liquid supply pipe is connected to the movable end of the hoist through a bracket.

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