A liquid alkali adding device
By premixing and diluting the alkali solution in the mixing tank using a alkali addition device, the problem of local over-alkaliization in the electrolyte circulation was solved, and the cobalt hydrolysis precipitation was reduced and the pH value was adjusted uniformly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GEM JIANGSU COBALT IND CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-30
AI Technical Summary
In the existing technology, the pre-mixed liquid alkali is directly injected into the electrolyte circulation pipeline, which can easily cause local over-alkaliization near the injection point, leading to cobalt hydrolysis and precipitation.
Design a liquid alkali addition device. The pre-mixed liquid alkali is injected into the mixing tank through the liquid alkali injection pipe group, and a portion of the electrolyte is diverted to the mixing tank through the branch pipe group. The electrolyte is pre-mixed and diluted in the mixing tank to form an intermediate concentration solution. Then, it is injected into the main pipeline at multiple points through the injection component to avoid local over-alkaliification.
It effectively avoids local over-alkalization, reduces the occurrence of cobalt hydrolysis precipitation, and achieves uniform pH adjustment.
Smart Images
Figure CN224430751U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of liquid alkali addition technology, specifically to a liquid alkali addition device. Background Technology
[0002] In the electrolyte circulation process of cobalt electrowinning, liquid alkali needs to be added to adjust the pH value. Traditionally, this involves manually injecting the liquid alkali into the electrolyte circulation pipeline multiple times. The liquid alkali is pre-mixed to the required concentration. For example, Chinese Patent 202120031068.1 discloses an anti-crystallization liquid alkali storage tank, including a tank body, a stirring paddle, a level pipe, a hot water pipe, a baffle plate, and a motor reducer. The motor reducer is located on the top of the tank body, and its output end is connected to the stirring paddle. A jacket layer is provided outside the tank body, and a hot water pipe is installed within the jacket layer. The pre-mixed liquid alkali is directly injected into the electrolyte circulation pipeline through the pipeline.
[0003] In the aforementioned existing technology, the pre-mixed liquid alkali is directly injected into the electrolyte circulation pipeline, which can easily lead to local over-alkaliization near the injection point, resulting in cobalt hydrolysis and precipitation. Utility Model Content
[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a liquid alkali addition device to solve the technical problem that in the prior art, when pre-mixed liquid alkali is directly injected into the electrolyte circulation pipeline, local over-alkaliization is easily generated near the injection point, leading to cobalt hydrolysis and precipitation.
[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:
[0006] This utility model provides a liquid alkali adding device for installation on the main pipeline of electrolyte circulation, comprising:
[0007] A mixing tank is used to mix alkaline solution and electrolyte to form a mixture.
[0008] A liquid alkali injection pipe assembly, which is connected to the mixing tank, is used for injecting liquid alkali;
[0009] A branch pipe assembly, connected to the mixing tank and in communication with the main pipeline, is used to divert electrolyte from the main pipeline to the mixing tank; and
[0010] An injection assembly, connected to the mixing tank, is used to guide the mixture back to the main pipeline and has an injection end connected to the main pipeline for multi-point injection of the mixture into the main pipeline.
[0011] In some embodiments, the injection assembly includes a connecting pipe, a connecting section pipe, and a plurality of nozzles. The connecting pipe is connected between the nozzles and the mixing tank for conveying the mixture. The plurality of nozzles are circumferentially mounted on the inner side of the connecting section pipe. The connecting section pipe is connected to a main pipeline for mixing and converging the electrolyte and the mixture in the main pipeline.
[0012] In some embodiments, the branch pipe assembly includes a connecting pipe body and a branch pipe body. One end of the branch pipe body is connected to the outside of the connecting pipe body, and the other end is connected to the mixing tank. One end of the connecting pipe body is connected to and communicates with the main pipeline, and the other end is connected to and communicates with the connecting section pipe. The electrolyte in the main pipeline is guided to flow through the connecting pipe body, partially diverted to the branch pipe body, and then converged in the connecting section pipe and returned to the main pipeline.
[0013] In some embodiments, a solenoid valve and a check valve are installed on the branch pipe, and a micro flow meter is installed on the branch pipe.
[0014] In some embodiments, the connecting pipeline includes a connecting pipe, a buffer flow stabilizer, and a flow divider. The two ends of the connecting pipe are respectively connected to the buffer flow stabilizer and the mixing tank. The buffer flow stabilizer is connected to the flow divider, and the flow divider is connected to and communicates with each of the nozzles.
[0015] In some embodiments, a conductivity sensor is installed at the connection end between the buffer flow stabilizer and the shunt pipe.
[0016] In some embodiments, the mixing tank includes a tank body and a stirring mechanism. The tank body has a liquid alkali inlet, an electrolyte inlet, and a mixed liquid outlet. The stirring mechanism is installed in the tank body and is used to stir and mix the diverted electrolyte and liquid alkali.
[0017] In some embodiments, the mixing tank further includes a liquid alkali distribution plate, which is installed on the inner top wall of the tank body. The liquid alkali distribution plate is connected and communicates with the liquid alkali inlet, and the bottom of the liquid alkali distribution plate has uniformly distributed outlet holes for uniformly distributing liquid alkali into the tank body.
[0018] In some embodiments, the liquid alkali distribution disk is in the shape of an annular disk.
[0019] In some embodiments, the liquid alkali injection pipeline assembly includes a liquid alkali storage tank, a metering pump, and an injection pipe. The mixing tank, injection pipe, metering pump, and liquid alkali storage tank are sequentially connected and interconnected through pipelines to form a passage for liquid alkali injection into the mixing tank.
[0020] Compared with the prior art, the liquid alkali adding device provided by this utility model injects the pre-prepared liquid alkali into the mixing tank through the liquid alkali injection pipe group, and diverts part of the electrolyte to the mixing tank through the branch pipe group. In the mixing tank, pre-mixing and dilution are carried out. The high-concentration liquid alkali is first pre-mixed with part of the electrolyte to form an intermediate concentration solution. Then, it is injected into the main flow channel at multiple points through the injection component. The direct connection of the pipeline for pre-dilution adjusts the pH while avoiding local over-alkalization that would lead to cobalt hydrolysis and precipitation. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the liquid alkali adding device provided in this embodiment of the utility model;
[0022] Figure 2 This is a cross-sectional structural diagram of the mixing tank of the liquid alkali addition device provided in this embodiment of the utility model;
[0023] Figure 3 This is a schematic diagram of the liquid alkali adding device provided in this embodiment of the invention, installed on the main pipeline.
[0024] Explanation of reference numerals in the attached figures:
[0025] 1. Mixing tank; 11. Tank body; 11a. Liquid alkali inlet; 11b. Electrolyte inlet; 11c. Mixed liquid outlet; 12. Stirring mechanism; 13. Liquid alkali distribution plate; 13a. Liquid outlet hole;
[0026] 2. Liquid alkali injection pipe assembly;
[0027] 3. Branch pipe assembly; 31. Connecting pipe body; 32. Branch pipe body; 321. Solenoid valve; 322. Check valve;
[0028] 4. Injection assembly; 41. Connecting pipeline; 411. Connecting pipe; 412. Buffer flow stabilizer; 413. Diverter pipe; 42. Connecting joint pipe; 43. Nozzle;
[0029] 5. Main pipeline. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model.
[0031] To address the technical problem of localized over-alkaliification near the injection point, leading to cobalt hydrolysis and precipitation, when pre-mixed liquid alkali is directly injected into the electrolyte circulation pipeline, this invention provides a liquid alkali addition device. This device injects pre-mixed liquid alkali into a mixing tank via a liquid alkali injection pipe assembly, and diverts a portion of the electrolyte to the mixing tank via a branch pipe assembly. Pre-mixing and dilution are performed in the mixing tank, where high-concentration liquid alkali is first pre-mixed with a portion of the electrolyte to form an intermediate concentration solution. This solution is then injected into the main pipeline at multiple points via the injection assembly. This direct-connection pre-dilution adjusts the pH while preventing localized over-alkaliification that could lead to cobalt hydrolysis and precipitation.
[0032] It should be noted that the liquid alkali adding device described in this utility model is used in, but not limited to, cobalt electrolysis electrolyte circulation pipelines. For ease of explanation, this utility model only uses the application of the liquid alkali adding device in the cobalt electrolysis electrolyte circulation pipeline as an example. The principle of the liquid alkali adding device in other types of equipment is essentially the same as that in the cobalt electrolysis electrolyte circulation pipeline, and will not be described in detail here.
[0033] Please see Figure 1-3 This invention provides a liquid alkali adding device, comprising a mixing tank 1, a liquid alkali injection pipe assembly 2, a branch pipe assembly 3, and an injection component 4. The mixing tank 1 is used to mix alkali and electrolyte to form a mixture, employing dynamic and active mixing of the alkali and electrolyte for efficient mixing. The liquid alkali injection pipe assembly 2 is connected to the mixing tank 1 and is used to inject liquid alkali. It connects to pre-mixed and stored liquid alkali with a relatively high concentration and supplies metered liquid alkali to the mixing tank 1 for mixing. The branch pipe assembly 3 is connected to the mixing tank 1 and communicates with a main pipeline 5, used to divert electrolyte from the main pipeline 5 to the mixing tank 1. 5-10% of the electrolyte is diverted from the main pipeline and pre-mixed and diluted with the alkali in the mixing tank 1 for active stirring and dilution. To reduce the concentration and avoid localized over-alkaliness caused by direct injection into the main pipeline 5; the injection component 4, which is connected to the mixing tank, is used to guide the mixed liquid back to the main pipeline, and has an injection end connected to the main pipeline for multi-point injection of the mixed liquid into the main pipeline, including a connecting pipe 41, a connecting section pipe 42, and several nozzles 43. The connecting pipe 41 is connected between the nozzles 43 and the mixing tank 1 for transporting the mixed liquid. Several nozzles 43 are circumferentially installed on the inner side of the connecting section pipe 42. The connecting section pipe 42 is connected to the main pipeline 5 to guide the flow of electrolyte, that is, through the circumferential arrangement of the nozzles 43, the mixed liquid is injected back into the flow path of the main pipeline 5 at multiple points in a slow and uniform manner, so as to be evenly mixed into the mainstream electrolyte.
[0034] In this embodiment, a portion of the electrolyte in the main pipeline 5 is diverted by the branch pipe group 3 and actively mixed with the liquid alkali introduced by the liquid alkali injection pipe group 2 in the mixing tank 1 to provide efficient mixing and dilute and reduce the concentration of the alkali solution. Then, it is slowly injected into the electrolyte flow path of the main pipeline 5 through multiple points to form a low-concentration injection with multiple points evenly distributed. This reduces the probability of local over-alkali caused by directly injecting relatively high-concentration alkali solution and reduces the loss of cobalt hydrolysis precipitation.
[0035] Furthermore, in order to controllably transport liquid alkali, the liquid alkali injection pipe assembly 2 includes a liquid alkali storage tank, a metering pump, and an injection pipe. The mixing tank 1, the injection pipe, the metering pump, and the liquid alkali storage tank are sequentially connected and linked by pipelines to form a passage for liquid alkali injection into the mixing tank 1. The liquid alkali is transported in a controllable flow rate by the metering pump.
[0036] In one embodiment, please refer to Figure 1 To facilitate the installation of the device into the main pipeline 5, connecting the electrolyte flow paths of the upper and lower sections of the main pipeline 5, and performing electrolyte diversion, mixing, and re-injection into the electrolyte flow path at this location, the branch pipe group 3 includes a connecting pipe body 31 and a branch pipe body 32. One end of the branch pipe body 32 is connected to the outside of the connecting pipe body 31, and the other end is connected to the mixing tank 1, forming a branch flow path to guide part of the electrolyte diversion to the mixing tank 1. One end of the connecting pipe 31 is connected to and communicates with the main pipe 5 and the upper section of the main pipe 5. The other end is connected to and communicates with the connecting section pipe 42. The electrolyte in the main pipe 5 is guided to flow through the connecting pipe 31, partially diverted to the branch pipe 32, and then converged and returned to the main pipe 5 at the connecting section pipe 42. At the connecting section pipe 42, the main electrolyte flow path is mixed with the mixed liquid. That is, the main electrolyte flow path is in the upper section of the main pipe 5, the connecting pipe 31, the connecting section pipe 42 and the lower section of the main pipe 5. The diverted electrolyte flows through the mixed liquid alkali and then re-enters the main flow path at the connecting section pipe and enters the lower section of the main pipe 5.
[0037] Understandably, the main pipe 5 is cut in the middle to form an installation area for the liquid alkali addition device. Along the direction of electrolyte circulation, the main pipe 5 is divided into an upper section and a lower section at the cut position in the installation area. The upper section of the main pipe 5 is connected to the connecting pipe body 31, and the lower section of the main pipe 5 is connected to the end of the connecting section pipe 42 away from the connecting pipe body 31.
[0038] In one embodiment, please refer to Figure 1 In order to control the flow path of the branch channel and avoid backflow, a solenoid valve 321 and a one-way valve 322 are installed on the branch pipe body 32. The opening and closing of the branch channel is controlled by the solenoid valve 321, and the electrolyte is supplied to flow unidirectionally to the mixing tank 1 along the branch pipe body 32 through the one-way valve 32.
[0039] Furthermore, a micro-flow meter is installed on the branch tube 32, which can monitor the flow rate of the electrolyte branch in real time. Based on the flow rate of the branch electrolyte, the concentration of concentrated alkali, and the target dilution concentration, the concentrated alkali supply can be automatically cut off when the pH after dilution is detected to be >8.0.
[0040] Furthermore, the dilution pipeline is wrapped with a self-regulating electric heating tape to maintain a temperature of 60±5℃.
[0041] Understandably, the liquid alkali injection pipe assembly 2 is equipped with an on / off valve, which uses a solenoid valve to cut off the supply of concentrated alkali.
[0042] In one embodiment, please refer to Figure 1 To provide a buffer injection and avoid excessive fluctuations in the injection flow rate, the connecting pipe 41 includes a connecting pipe 411, a buffer flow stabilizing tank 412, and a diverting pipe 413. The two ends of the connecting pipe 411 are connected to the buffer flow stabilizing tank 412 and the mixing tank 1, respectively. The buffer flow stabilizing tank 412 is connected to the diverting pipe 413, and the diverting pipe 413 is connected and communicates with each of the nozzles 43. The buffer flow stabilizing tank 412 provides buffering and stabilization, and the mixing liquid is then transported to each nozzle 43 through the diverting pipe 413 for multi-point injection.
[0043] Understandably, the buffer stabilizing tank 412 is equipped with a pH detection electrode to detect the pH value of the mixed and stabilized split electrolyte solution.
[0044] Furthermore, a conductivity sensor is installed at the connection end between the buffer stabilizing tank 412 and the diverter pipe 413, and an online conductivity meter is installed at the outlet of the buffer tank to monitor the concentration of the diluted alkali solution in real time. The conductivity is approximately equal to the concentration × 2.5 mS / cm, which can detect mixing abnormalities earlier than the pH value.
[0045] In one embodiment, please refer to Figure 2 In order to form a specific mixing process, the mixing tank 1 includes a tank body 11 and a stirring mechanism 12. The tank body 11 has a liquid alkali inlet 11a, an electrolyte inlet 11b, and a mixed liquid outlet 11c. The stirring mechanism 12 is installed inside the tank body 11 and is used to stir and mix the divided electrolyte and liquid alkali. The stirring mechanism 12 can be a motor-driven stirring paddle for stirring and mixing.
[0046] Furthermore, in order to control the dispersion and droplet size of the injected liquid alkali and avoid local concentration, the mixing tank 1 also includes a liquid alkali distribution plate 13. The liquid alkali distribution plate 13 is installed on the inner top wall of the tank body 11. The liquid alkali distribution plate 13 is connected and communicates with the liquid alkali inlet 11a. The bottom of the liquid alkali distribution plate 13 has uniformly distributed outlet holes 13a for uniformly distributing the liquid alkali into the tank body 11. The liquid alkali distribution plate 13 has a flat cavity to disperse the liquid alkali in a plane and control the discharge hole diameter from the uniformly distributed outlet holes 13a at the bottom to effectively disperse the liquid alkali.
[0047] Understandably, the diameter of the liquid outlet hole 13a is no greater than 5mm, and the opening rate accounts for at least 60% of the plate surface.
[0048] Furthermore, in order to avoid the stirring shaft of the stirring mechanism 12, the liquid alkali distribution disk 13 is shaped like an annular disk.
[0049] To better understand this utility model, the following is combined with... Figures 1 to 3 The technical solution of this utility model is described in detail as follows: A connecting pipe body 31 and a connecting section pipe 42 are installed on the main pipeline 5 to form the main pipeline for electrolyte flow. The electrolyte flowing in the main pipeline is diverted to the mixing tank 1 to mix the alkali solution through the branch pipe body 32. The alkali solution is transported under the metering of the metering pump in the liquid alkali injection pipe group 2. At the same time, the flow rate of the electrolyte diversion is detected by the micro flow meter in the branch flow path of the branch pipe group 3, and the flow rate of the electrolyte diversion is dynamically matched and mixed in the mixing tank 1. In the mixing tank 1, the alkali solution is dispersed by the liquid alkali distribution plate 13 and mixed with the stirring mechanism 12 to efficiently disperse the electrolyte and alkali solution. After being buffered by the buffer stabilizing tank 412, the mixed solution enters the diversion pipe 413 and then connects to the main electrolyte flow path in the section pipe 42 from each nozzle 43.
[0050] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.
Claims
1. A liquid caustic soda adding device for installation on a main pipe of an electrolyte circulation, characterized by, include: A mixing tank is used to mix alkaline solution and electrolyte to form a mixture. A liquid alkali injection pipe assembly, which is connected to the mixing tank, is used for injecting liquid alkali; A branch pipe assembly, connected to the mixing tank and in communication with the main pipeline, is used to divert electrolyte from the main pipeline to the mixing tank; and An injection assembly, connected to the mixing tank, is used to guide the mixture back to the main pipeline and has an injection end connected to the main pipeline for multi-point injection of the mixture into the main pipeline.
2. The liquid alkali adding device according to claim 1, characterized in that, The injection assembly includes a connecting pipe, a connecting section pipe, and several nozzles. The connecting pipe is connected between the nozzles and the mixing tank for conveying the mixture. The several nozzles are circumferentially installed on the inner side of the connecting section pipe. The connecting section pipe is connected to the main pipeline for mixing and converging the electrolyte and the mixture in the main pipeline.
3. The liquid alkali adding device according to claim 2, characterized in that, The branch pipe assembly includes a connecting pipe body and a branch pipe body. One end of the branch pipe body is connected to the outside of the connecting pipe body, and the other end is connected to the mixing tank. One end of the connecting pipe body is connected to and communicates with the main pipeline, and the other end is connected to and communicates with the connecting section pipe. The electrolyte in the main pipeline is guided to flow through the connecting pipe body, partially diverted to the branch pipe body, and then converged in the connecting section pipe and returned to the main pipeline.
4. The liquid alkali adding device according to claim 3, characterized in that, The branch pipe is equipped with a solenoid valve and a check valve, and a micro flow meter is also installed on the branch pipe.
5. The liquid alkali adding device according to claim 1, characterized in that, The connecting pipeline includes a connecting pipe, a buffer flow stabilizer, and a flow divider. The two ends of the connecting pipe are respectively connected to the buffer flow stabilizer and the mixing tank. The buffer flow stabilizer is connected to the flow divider, and the flow divider is connected to and communicates with each of the nozzles.
6. The liquid alkali adding device according to claim 5, characterized in that, A conductivity sensor is installed at the connection end between the buffer flow stabilizer and the shunt pipe.
7. The liquid alkali adding device according to claim 1, characterized in that, The mixing tank includes a tank body and a stirring mechanism. The tank body has a liquid alkali inlet, an electrolyte inlet, and a mixed liquid outlet. The stirring mechanism is installed inside the tank body and is used to stir and mix the split electrolyte and liquid alkali.
8. The liquid alkali adding device according to claim 7, characterized in that, The mixing tank also includes a liquid alkali distribution plate, which is installed on the inner top wall of the tank body. The liquid alkali distribution plate is connected and communicates with the liquid alkali inlet, and the bottom of the liquid alkali distribution plate has uniformly distributed outlet holes for uniformly distributing liquid alkali into the tank body.
9. The liquid alkali adding device according to claim 8, characterized in that, The liquid alkali distribution disk is in the shape of a ring.
10. The liquid alkali adding device according to claim 1, characterized in that, The liquid alkali injection pipeline assembly includes a liquid alkali storage tank, a metering pump, and an injection pipe. The mixing tank, injection pipe, metering pump, and liquid alkali storage tank are connected and linked in sequence through pipelines to form a passage for liquid alkali injection into the mixing tank.