CCD countercurrent washing flocculant uniform feeding system

Abstract

The invention discloses a CCD countercurrent washing flocculant uniform feeding system which comprises a settling tank, a forced dilution pump, a flocculant main pipe and a secondary flocculant pipe, a flow stabilizing cylinder is mounted on the settling tank, and a feeding channel extending into the flow stabilizing cylinder is arranged on the settling tank; an outlet of the forced dilution pump is formed in the feeding channel and is used for injecting a diluent into the feeding channel to be mixed with materials; the flocculant main pipe is embedded and inserted between the outlet of the forced dilution pump and the feeding channel; and a plurality of secondary flocculant pipes are arranged. According to the CCD countercurrent washing flocculant uniform feeding system provided by the invention, the flocculant is uniformly added at multiple points through the flocculant main pipe embedded between the outlet of the forced dilution pump and the feeding channel and the plurality of secondary flocculant pipes arranged along the inner circle of the flow stabilizing cylinder at equal intervals in the circumferential direction, so that the flocculant is uniformly added at multiple points; and each flocculating agent injection pipe is injected below the liquid level with kinetic energy impact, so that the flocculating agent is impacted into the material.

Description

Technical Field

[0001] This invention relates to the field of CCD countercurrent washing flocculant addition technology, specifically to a CCD countercurrent washing flocculant uniform feeding system. Background Technology

[0002] Counter-current washing (CCD) is a widely used solid-liquid separation technology in industry, primarily used to improve washing efficiency, especially in the hydrometallurgical process of laterite nickel ore. This process uses a continuous fluid to flush the material counter-currently, utilizing the density difference of the solid phase and the impact force of the washing liquid on the material during solid-liquid separation to separate the solid and liquid phases, thereby improving washing efficiency and recovery rate. In existing processes, flocculants need to be added to the settling tank, typically using multiple flocculant injection points via pipelines. For example, Chinese patent CN108502999B discloses a secondary dilution multi-point dosing system and its usage method, including a secondary dilution system, a ring distribution pipe, and multiple identical inclined short injection pipes; the secondary dilution system includes a dissolving tank, a dispensing valve, a reagent tank, a maintenance valve, a metering pump, a reagent pipe, a first flow meter, a frequency converter, a pressure water pipe, a water supply valve, and a second flow meter.

[0003] The existing technology has the following problems: the amount of flocculant added at each point after dilution is estimated by adjusting the valve opening, and there is no accurate data. In addition, the original flocculant pipelines at each point of addition are designed as DN80 pipelines, which are too thick. Due to the small amount of flocculant added, it is very difficult to control the valve opening. In actual production, uneven flocculant addition or failure to add flocculant often occurs. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a CCD countercurrent washing flocculant uniform feeding system to solve the technical problems that often occur in the actual production process of the prior art, such as uneven flocculant addition or failure to add flocculant.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides a CCD countercurrent washing flocculant uniform feeding system, comprising: A settling tank with a flow stabilizer installed on it, and a feed channel extending into the flow stabilizer is provided on the settling tank. A forced dilution pump, with its outlet located on the feed channel, is used to inject diluent into the feed channel for mixing with the material; The flocculant main pipe is inserted between the outlet of the forced dilution pump and the feed channel; and There are multiple secondary flocculant tubes, which are circumferentially and equidistantly arranged along the inner circle of the flow stabilizer. The flocculant injection flow rate of the main flocculant tube and the secondary flocculant tubes is matched with their inner diameter, and are used to inject flocculant below the liquid surface where the flocculant has kinetic energy impact.

[0006] In some embodiments, the flocculant main pipe and the secondary flocculant pipe are both inserted vertically. The flocculant main pipe and the secondary flocculant pipe are DN40 or DN50 pipes. The flocculant main pipe and the secondary flocculant pipe are connected to a flocculant supply tank through a screw pump. Flow meters are installed on both the flocculant main pipe and the secondary flocculant pipe.

[0007] In some embodiments, the number of flocculant main pipes is one, with its bottom end embedded and extending into the underflow position of the forced dilution pump outlet and located at the intersection of the feed channel and the flow stabilizer, for injecting flocculant at the mixing point of the underflow at the forced dilution pump outlet and the overflow in the flow stabilizer.

[0008] In some embodiments, there are two secondary flocculant tubes, with one main flocculant tube and two secondary flocculant tubes arranged in a triangle around the inner circle of the flow stabilizer, for uniformly distributing the injection of flocculant.

[0009] In some embodiments, one of the flocculant main tubes and two of the secondary flocculant tubes are inserted below the liquid surface to a depth that gradually decreases, starting with the flocculant main tube.

[0010] In some embodiments, the flocculant main tube is inserted to a depth of 15 cm from the top edge of the feed channel downwards, one of the secondary flocculant tubes is inserted to a depth 10 cm higher than the flocculant main tube, and the other secondary flocculant tube is inserted to a depth 5 cm higher than the flocculant main tube.

[0011] In some embodiments, the number of feed channels is two, and the flocculant main pipe is embedded in the outlet of the forced dilution pump and located within the feed channels for injecting flocculant at the material mixing point between the forced dilution pump outlet and the feed channels.

[0012] In some embodiments, the number of secondary flocculant tubes is five, and the five secondary flocculant tubes are evenly distributed on the inner circumference of the flow stabilizer.

[0013] In some embodiments, the five secondary flocculant tubes are distributed at 60° intervals along the inner circumference of the flow stabilizer.

[0014] In some embodiments, the flocculant addition ratio of the two flocculant main tubes and the five secondary flocculant tubes is gradually reduced, starting from the flocculant main tubes.

[0015] Compared with the prior art, the CCD countercurrent washing flocculant uniform feeding system provided by the present invention adds flocculant evenly at multiple points by means of a main flocculant pipe embedded between the outlet of the forced dilution pump and the feed channel, and multiple secondary flocculant pipes arranged circumferentially at equal intervals along the inner circle of the flow stabilizer. With the proportion control, the flocculant can better promote the flocculation of the material. Moreover, each flocculant injection pipe is below the injection liquid surface with kinetic energy impact, so that the flocculant impacts into the material and mixes thoroughly with the internal material. Attached Figure Description

[0016] Figure 1 This is a top view of a CCD countercurrent washing flocculant uniform feeding system provided in an embodiment of the present invention; Figure 2 This is a partial top view of a CCD countercurrent washing flocculant uniform feeding system provided in an embodiment of the present invention; Figure 3 This is a partial cross-sectional view of a CCD countercurrent washing flocculant uniform feeding system provided in an embodiment of the present invention; Figure 4 This is a top view of a CCD countercurrent washing flocculant uniform feeding system provided in another embodiment of the present invention; Figure 5 This is a partial top view of a CCD countercurrent washing flocculant uniform feeding system provided in another embodiment of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1. Settling tank; 101. Flow stabilizer; 102. Feed channel; 2. Forced dilution pump; 3. Main flocculant pipe; 4. Secondary flocculant pipe; 401. Screw pump; 402. Flocculant supply tank; 403. Flow meter. Detailed Implementation

[0018] 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.

[0019] To address the technical problem of uneven or insufficient flocculant addition during actual production, this invention provides a CCD countercurrent washing flocculant uniform feeding system. This system enables the flocculant to be injected with kinetic impact, which is beneficial for mixing with internal materials. Furthermore, the flocculant is added evenly at multiple points, and with proportion control, the flocculant can better promote material flocculation.

[0020] It should be noted that the CCD countercurrent washing flocculant uniform feeding system described in this invention is used in, but not limited to, the hydrometallurgical nickel production process. For ease of explanation, this invention only uses the application of the CCD countercurrent washing flocculant uniform feeding system in the hydrometallurgical nickel production process as an example. The principle of the CCD countercurrent washing flocculant uniform feeding system in other industrial production processes is essentially the same as that in the hydrometallurgical nickel production process, and will not be elaborated here.

[0021] Please see Figure 1 , Figure 1 This is a schematic diagram of a CCD countercurrent washing flocculant uniform feeding system according to an embodiment of the present invention. The CCD countercurrent washing flocculant uniform feeding system includes a settling tank 1, a forced dilution pump 2, a flocculant main pipe 3, and secondary flocculant pipes 4. A flow stabilizer 101 is installed on the settling tank 1, and a feed channel 102 extending into the flow stabilizer 101 is provided on the settling tank 1. The outlet of the forced dilution pump 2 is located on the feed channel 102 for injecting diluent into the feed channel 102 to mix with the material. The flocculant main pipe 3 is embedded between the outlet of the forced dilution pump 2 and the feed channel 102. There are multiple secondary flocculant pipes 4, which are equidistantly arranged circumferentially along the inner circle of the flow stabilizer 101. The main flocculant pipe 3 forms a flocculant injection pattern with points evenly distributed throughout the entire flow stabilizer 101, starting from the position embedded between the outlet of the forced dilution pump 2 and the feed channel 102. The flocculant is added at multiple even points, and with proportional control, the flocculant can better promote the flocculation of materials. The flocculant injection flow rate of the main flocculant pipe 3 and the secondary flocculant pipe 4 is matched with their inner diameter, so that the flocculant is injected below the liquid surface with kinetic energy impact, which is beneficial for mixing with the internal materials.

[0022] Understandably, the amount of diluted flocculant added at each point is estimated based on the opening of the adjustment valve, without accurate data. Furthermore, the original flocculant pipelines at each point were designed as DN80 pipes, which are too large. Due to the small amount of flocculant added, controlling the valve opening is very difficult, often resulting in uneven or insufficient flocculant addition during actual production. To achieve more accurate quantification, the inner diameter of the pipeline at each flocculant addition point is reduced to match the flocculant injection flow rate. With the pipeline inner diameter matching the flocculant injection flow rate, the reduced diameter without changing the flow rate increases the flocculant injection velocity, creating a kinetic energy impact. This kinetic energy impact propels the flocculant into the material, mixing it with the internal material, avoiding the problem of slow flocculant flow in larger pipelines that only mixes with the surface material of the feed pipe.

[0023] In one embodiment, please refer to Figure 3The main flocculant pipe 3 and the secondary flocculant pipe 4 are DN40 or DN50 pipes, used to match the injection of flocculant at a smaller flow rate. The main flocculant pipe 3 and the secondary flocculant pipe 4 are connected to the flocculant supply tank 402 through a screw pump 401. The screw pump 401 pumps flocculant to the corresponding flocculant pipe for injection. Both the main flocculant pipe 3 and the secondary flocculant pipe 4 are equipped with flow meters 403, which facilitates the control of the injected flocculant ratio.

[0024] Understandably, changing the pipes at each flocculant addition point to DN40 or DN50 pipes reduces the inner diameter of the pipes. The thinner pipes, combined with the kinetic energy provided by the screw pump, facilitate mixing with the internal materials. Otherwise, with thicker pipes, the flocculant flow rate would be slower, and it would only mix with the materials on the surface of the feed pipe. Furthermore, the flow meter 403 allows for the addition of flocculant in proportion.

[0025] Furthermore, the flocculant main pipe 3 and the secondary flocculant pipe 4 are both inserted vertically. When the flocculant is injected, it causes a certain disturbance to the material fluid. Under this disturbance, the flocculant and the material are fully mixed. If the injection point pipe is tilted, the disturbance force along the material rotation direction will be reduced, and the mixing will be uneven. Therefore, the injection pipe is in a vertical position to avoid the disturbance reduction caused by the tilted position. The mixing is achieved by the feed flow rate and the flocculant impact flow rate, which also avoids the flocculant particles being broken due to excessive disturbance.

[0026] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The number of flocculant main pipes 3 is one, and its bottom end is embedded and extends into the underflow position of the outlet of the forced dilution pump 2, and is located at the intersection of the feed channel 102 and the flow stabilizer 101. It is used to inject flocculant at the mixing point of the underflow at the outlet of the forced dilution pump 2 and the overflow in the flow stabilizer 101. The above is a three-point addition method, starting from the mixing point of the underflow and overflow at the outlet of the forced dilution pump, and adding it according to the triangular distribution inside the central cylinder circle. It is mainly used for single-channel P-DUK.

[0027] Furthermore, there are two secondary flocculant tubes 4. One main flocculant tube 3 and the two secondary flocculant tubes 4 are distributed in a triangle around the inner circle of the flow stabilizer 101, which are three injection points in a three-point injection method, used to evenly inject flocculant.

[0028] Furthermore, one of the flocculant main pipes 3 and two of the secondary flocculant pipes 4 are inserted to a depth below the liquid surface, starting with the flocculant main pipe 3 and gradually decreasing. This is because after the flocculant main pipe 3 is added, the material begins to flocculate and settle. With the thrust of the incoming material, the material rotates in the flow stabilizer 101. After flocculation, large particles rotate and sink, while relatively small particles continue to rotate in the flow stabilizer 101 with the thrust. During the rotation, the sinking of heavy particles gives the material an upward buoyancy. When the weight of the small particles is less than the buoyancy, they float upward. At the second point, flocculant is further added through a secondary flocculant pipe 4 to mix and flocculate, increasing the gravity and sinking of the small particles. Finally, at the third addition point, another secondary flocculant pipe 4 is used to flocculate the remaining very small particles again, increasing their gravity and sinking, thereby improving the flocculant mixing effect and reducing the flocculant consumption.

[0029] Specifically, the flocculant main pipe 3 is inserted to a depth of about 15cm from the upper edge of the feed channel 102. The insertion depth of one of the secondary flocculant pipes 4 is about 10cm higher than the insertion depth of the flocculant main pipe 3, and the insertion depth of the other secondary flocculant pipe 4 is about 5cm higher than the insertion depth of the flocculant main pipe 3.

[0030] In one embodiment, please refer to Figure 4 and Figure 5 The number of feed channels 102 is two. The flocculant main pipe 3 is embedded in the outlet of the forced dilution pump 2 and located in the feed channel 102. It is used to inject flocculant at the material mixing point between the outlet of the forced dilution pump 2 and the feed channel 102 for dual-channel P-DUK.

[0031] Furthermore, there are five secondary flocculant pipes 4, which are evenly distributed on the inner circle of the flow stabilizer 101 to add flocculant in a distributed manner. The addition is done at seven points: two are the outlets of the two forced dilution pumps 2 and the material mixing points, i.e., two flocculant main pipes 3, and the other five are five secondary flocculant pipes 4.

[0032] The five secondary flocculant tubes 4 are distributed at 60° intervals on the inner circle of the flow stabilizer 101, and the multi-point addition layout allows for better mixing of materials.

[0033] Furthermore, the flocculant addition ratio of the two flocculant main pipes 3 and the five secondary flocculant pipes 4 is gradually reduced starting from the flocculant main pipe 3, with a multi-point addition layout to better mix the materials. The addition ratio is gradually reduced to effectively add flocculant according to the data ratio.

[0034] Understandably, the reduction in the flocculant addition ratio depends on the particle size distribution of the materials. For slurry particle sizes, there are sieve sizes of 200 mesh, 120 mesh, 80 mesh, and 20 mesh. For the main processing of materials below the 80 mesh sieve, the increased weight of the mixing chain leads to greater settling, and subsequent materials gradually settle during rotation, resulting in a relative decrease in the amount of remaining material. Therefore, the required flocculant dosage is reduced, and the reduction ratio is determined based on the particle size distribution of the materials.

[0035] To better understand this invention, the following is combined with... Figures 1 to 5 The technical solution of the present invention is described in detail as follows: In a single-channel P-DUK, a three-point addition method is adopted, which has one feed channel 102, one forced dilution pump 2, one flocculant main pipe 3, and two secondary flocculant pipes 4. The flocculant main pipe 3 and the two secondary flocculant pipes 4 are distributed circumferentially within the flow stabilizer 101, and the flocculant main pipe 3 is located at the mixing point between the underflow at the outlet of the forced dilution pump 2 and the overflow in the flow stabilizer 101. In a dual-channel P-DUK, a seven-point addition method is adopted, which has two feed channels 102, two forced dilution pumps 2, two flocculant main pipes 3, and five secondary flocculant pipes 4. The two addition points are the mixing points at the outlets of the two forced dilution pumps 2 and the material, where one flocculant main pipe 3 is inserted. The other five points are evenly distributed at an angle of approximately 60°, where one secondary flocculant pipe 4 is inserted. The addition ratio is gradually reduced.

[0036] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A CCD countercurrent washing flocculant uniform feeding system, characterized in that, include: A settling tank with a flow stabilizer installed on it, and a feed channel extending into the flow stabilizer is provided on the settling tank. A forced dilution pump, with its outlet located on the feed channel, is used to inject diluent into the feed channel for mixing with the material; The flocculant main pipe is inserted between the outlet of the forced dilution pump and the feed channel; and There are multiple secondary flocculant tubes, which are circumferentially and equidistantly arranged along the inner circle of the flow stabilizer. The flocculant injection flow rate of the main flocculant tube and the secondary flocculant tubes is matched with their inner diameter, and are used to inject flocculant below the liquid surface where the flocculant has kinetic energy impact.

2. The CCD countercurrent washing flocculant uniform feeding system according to claim 1, characterized in that, Both the main flocculant pipe and the secondary flocculant pipe are inserted vertically. Both the main flocculant pipe and the secondary flocculant pipe are DN40 or DN50 pipes. Both the main flocculant pipe and the secondary flocculant pipe are connected to a flocculant supply tank via a screw pump. Both the main flocculant pipe and the secondary flocculant pipe are equipped with flow meters.

3. The CCD countercurrent washing flocculant uniform feeding system according to claim 2, characterized in that, The number of flocculant main tubes is one, with its bottom end embedded and extending into the underflow position of the forced dilution pump outlet, and located at the intersection of the feed channel and the flow stabilizer, for injecting flocculant at the mixing point of the underflow at the forced dilution pump outlet and the overflow in the flow stabilizer.

4. The CCD countercurrent washing flocculant uniform feeding system according to claim 3, characterized in that, The number of secondary flocculant tubes is two. One main flocculant tube and two secondary flocculant tubes are distributed in a triangle around the inner circle of the flow stabilizer to evenly inject flocculant.

5. The CCD countercurrent washing flocculant uniform feeding system according to claim 4, characterized in that, One of the flocculant main tubes and two of the secondary flocculant tubes are inserted below the liquid surface to a depth that gradually decreases, starting with the flocculant main tube.

6. The CCD countercurrent washing flocculant uniform feeding system according to claim 1, characterized in that, The flocculant main tube is inserted to a depth of 15cm from the top edge of the feed channel. One of the secondary flocculant tubes is inserted to a depth 10cm higher than the flocculant main tube, and the other secondary flocculant tube is inserted to a depth 5cm higher than the flocculant main tube.

7. The CCD countercurrent washing flocculant uniform feeding system according to claim 2, characterized in that, The number of feed channels is two, and the flocculant main pipe is embedded in the outlet of the forced dilution pump and located in the feed channel, for injecting flocculant at the material mixing point between the forced dilution pump outlet and the feed channel.

8. The CCD countercurrent washing flocculant uniform feeding system according to claim 7, characterized in that, The number of secondary flocculant tubes is five, and the five secondary flocculant tubes are evenly distributed on the inner circle of the flow stabilizer.

9. The CCD countercurrent washing flocculant uniform feeding system according to claim 8, characterized in that, The five secondary flocculant tubes are distributed at 60° intervals along the inner circumference of the flow stabilizer.

10. The CCD countercurrent washing flocculant uniform feeding system according to claim 9, characterized in that, The flocculant addition ratio of the two flocculant main tubes and the five secondary flocculant tubes is gradually reduced, starting from the flocculant main tubes.

Images