Preparation system for precipitant used in MHP precipitation

Abstract

A preparation system for a precipitant used in MHP precipitation, comprising a sodium hydroxide storage tank (1), a first-stage nickel-cobalt precipitation underflow storage tank (2), a dilution liquid introduction mechanism (3), and a seed crystal tank (4). The sodium hydroxide storage tank (1) is used for storing a sodium hydroxide solution. A liquid intake end of the first-stage nickel-cobalt precipitation underflow storage tank (2) is in communication with a first-stage nickel-cobalt precipitation apparatus and is used for storing part of an underflow from first-stage nickel-cobalt precipitation. The sodium hydroxide storage tank (1), the first-stage nickel-cobalt precipitation underflow storage tank (2), and the dilution liquid introduction mechanism (3) are in communication with a liquid inlet of the seed crystal tank (4) to respectively introduce the sodium hydroxide solution, the first-stage nickel-cobalt precipitation underflow, and a dilution liquid into the seed crystal tank (4). A liquid outlet of the seed crystal tank (4) is in communication with the first-stage nickel-cobalt precipitation apparatus. By means of adding nickel-cobalt hydroxide crystals from the first-stage nickel-cobalt underflow as seed crystals into the first-stage nickel-cobalt precipitation apparatus, better crystallization and growth of nickel-cobalt hydroxide crystals in the first-stage nickel-cobalt precipitation apparatus are promoted. The sodium hydroxide solution can also be diluted to ensure that, after being added to the first-stage nickel-cobalt precipitation apparatus, local over-alkalization does not occur, thereby improving the quality of MHP products.

Description

A preparation system of precipitant for MHP precipitation TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrometallurgy, in particular to a preparation system of precipitant for MHP precipitation. BACKGROUND

[0002] Laterite nickel ore is a loose clay-like multi-mineral aggregate formed by long-term weathering, leaching, impregnation and alteration of nickel-bearing olivine-based rocks in tropical or subtropical regions, accompanied by metal components such as nickel, cobalt, chromium, magnesium and aluminum.

[0003] At present, in the hydrometallurgical process of laterite nickel ore, sodium hydroxide solution is often used as a nickel-cobalt precipitant. The sodium hydroxide solution is gradually pumped into the nickel-cobalt precipitation tank to gradually increase the pH value in the tank, and the precipitation and separation of nickel and cobalt ions are realized by utilizing the pH difference of different metal ions, so as to achieve the purpose of nickel and cobalt purification.

[0004] However, there are problems in industrial production. When a large amount of sodium hydroxide solution is added, local over-alkalization occurs in the nickel-cobalt precipitation tank, that is, the pH of the local aqueous solution is too high, which leads to the simultaneous precipitation of multiple metal ions, resulting in a large amount of impurities in the precipitated product, and the quality of the MHP product obtained by precipitation is not high.

[0005] SUMMARY

[0006] The purpose of the present application is to overcome the above technical deficiencies and provide a preparation system of precipitant for MHP precipitation to solve the technical problem of low quality of MHP product caused by local over-alkalization in the prior art.

[0007] To achieve the above technical purpose, the following technical scheme is adopted in the present application:

[0008] The present application provides a preparation system of precipitant for MHP precipitation, comprising:

[0009] A sodium hydroxide storage tank for storing sodium hydroxide solution;

[0010] A first-stage nickel-cobalt precipitation underflow storage tank in communication with the first-stage nickel-cobalt precipitation device for storing part of the underflow of the first-stage nickel-cobalt precipitation;

[0011] A dilution liquid introduction mechanism; and

[0012] A seed tank, the sodium hydroxide storage tank, the first-stage nickel-cobalt precipitation underflow storage tank, the dilution liquid introduction mechanism and the liquid inlet of the seed tank are in communication, respectively introducing sodium hydroxide solution, first-stage nickel-cobalt precipitation underflow and dilution liquid into the seed tank, and the liquid outlet of the seed tank is in communication with the first-stage nickel-cobalt precipitation device.

[0013] In some embodiments, the dilution liquid introduction mechanism is used to introduce and adjust multiple dilution liquids.

[0014] In some embodiments, the dilution liquid introduction mechanism comprises an industrial water storage tank, the outlet of which is connected to the inlet pipe of the seed tank.

[0015] In some embodiments, the dilution liquid introduction mechanism further comprises a post-manganese removal liquid tank, the outlet of which is connected to the inlet pipe of the seed tank, and the inlet of which is connected to the overflow end of the post-manganese removal thickener. The overflow end of the post-manganese removal thickener pours the post-manganese removal liquid into the post-manganese removal liquid tank, which is used to introduce the post-manganese removal liquid as a dilution liquid into the seed tank.

[0016] In some embodiments, the dilution liquid introduction mechanism further comprises a two-stage nickel-cobalt removal clear liquid storage tank, the inlet of which is connected to the two-stage nickel-cobalt removal device, and the outlet of which is connected to the inlet pipe of the seed tank.

[0017] In some embodiments, the dilution liquid introduction mechanism further comprises a controller, an industrial water flow detector, a post-manganese removal liquid control valve, and a two-stage nickel-cobalt removal clear liquid control valve. The industrial water flow detector is arranged on the pipeline between the industrial water storage tank and the seed tank, and is used to detect the flow of industrial water. The post-manganese removal liquid control valve is arranged on the pipeline between the post-manganese removal liquid tank and the seed tank, and is used to control the supply of post-manganese removal liquid. The two-stage nickel-cobalt removal clear liquid control valve is arranged on the pipeline between the two-stage nickel-cobalt removal clear liquid storage tank and the seed tank, and is used to control the supply of two-stage nickel-cobalt removal clear liquid. The controller is electrically connected to the industrial water flow detector, the post-manganese removal liquid control valve, and the two-stage nickel-cobalt removal clear liquid control valve, and is used to control the opening and closing of the post-manganese removal liquid control valve and the two-stage nickel-cobalt removal clear liquid control valve according to the detection results of the industrial water flow detector.

[0018] In some embodiments, a dilution liquid inlet is arranged on the sidewall of the bottom of the seed tank, and the dilution liquid inlet is in communication with the dilution liquid introduction mechanism. A sodium hydroxide inlet and a first-stage nickel-cobalt precipitation underflow inlet are arranged on the top of the seed tank, and are in communication with the sodium hydroxide storage tank and the first-stage nickel-cobalt precipitation underflow storage tank, respectively. A mixed liquid discharge pipe is arranged on the other sidewall of the bottom of the seed tank, and the mixed liquid discharge pipe is in communication with the top of the first-stage nickel-cobalt precipitation device.

[0019] In some embodiments, a discharge control valve is arranged on the mixed liquid discharge pipe, and the mixing time of the solutions in the seed tank is controlled by controlling the opening and closing of the discharge control valve.

[0020] In some embodiments, the mixed solution discharge pipe extends away from one end of the seed tank to form a plurality of discharge branch pipes, and the plurality of discharge branch pipes are uniformly arranged along the circumference of the one-stage nickel-cobalt precipitation device and are in communication with the top of the one-stage nickel-cobalt precipitation device.

[0021] In some embodiments, the stirring device comprises a stirring motor, a speed reducer, a coupling, and a stirring rod, the stirring motor, the speed reducer, and the coupling are sequentially connected, the output end of the coupling is coaxially fixed with the stirring rod, one end of the stirring rod extends into the seed tank, and a plurality of stirring blades are arranged on the end of the stirring rod in the seed tank.

[0022] Compared with the prior art, the preparation system of the precipitant for MHP precipitation provided by the application comprises a sodium hydroxide storage tank, a one-stage nickel-cobalt precipitation underflow storage tank, a dilution liquid introduction mechanism, and a seed tank, the sodium hydroxide storage tank is used for storing a sodium hydroxide solution; the liquid inlet end of the one-stage nickel-cobalt precipitation underflow storage tank is in communication with a one-stage nickel-cobalt precipitation device and is used for storing part of the underflow of the one-stage nickel-cobalt precipitation; the liquid inlets of the sodium hydroxide storage tank, the one-stage nickel-cobalt precipitation underflow storage tank, the dilution liquid introduction mechanism, and the seed tank are in communication, respectively introducing the sodium hydroxide solution, the one-stage nickel-cobalt precipitation underflow, and the dilution liquid into the seed tank, and the liquid outlet of the seed tank is in communication with the one-stage nickel-cobalt precipitation device. The sodium hydroxide solution, the one-stage nickel-cobalt precipitation underflow, and the dilution liquid are mixed to form a precipitant, which is then sent into the one-stage nickel-cobalt precipitation device; on the one hand, the nickel-cobalt hydroxide crystals in the one-stage nickel-cobalt precipitation underflow are added into the one-stage nickel-cobalt precipitation device as seeds to promote the better crystallization and growth of the nickel-cobalt hydroxide crystals in the one-stage nickel-cobalt precipitation device; on the other hand, the sodium hydroxide solution is diluted to ensure that there is no local over-alkaline condition after being added into the one-stage nickel-cobalt precipitation device, thereby ensuring the nickel-cobalt precipitation effect in the one-stage nickel-cobalt precipitation device and improving the quality of the MHP product.

[0023] The above description is only a summary of the technical solutions of the application. In order to more clearly understand the technical means of the application, and to implement the content of the description, the preferred embodiments of the application are described in detail below with reference to the accompanying drawings. The specific embodiments of the application are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a structural schematic view of the preparation system of the precipitant for MHP precipitation provided by the application.

[0025] Mark explanation:

[0026] 1-sodium hydroxide storage tank, 2-first stage nickel-cobalt precipitation bottom stream storage tank, 3-dilution liquid introduction mechanism, 31-industrial water storage tank, 32-manganese-removed liquid tank, 33-second stage nickel-cobalt precipitation clear liquid storage tank, 34-industrial water flow detector, 35-manganese-removed liquid control valve, 36-second stage nickel-cobalt precipitation clear liquid control valve, 4-seed tank, 41-mixed liquid discharge pipe, 5-stirring device. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0028] Please refer to FIG. 1; the present application provides a preparation system of precipitant for MHP precipitation, which comprises: a sodium hydroxide storage tank 1, a first stage nickel-cobalt precipitation bottom stream storage tank 2, a dilution liquid introduction mechanism 3 and a seed tank 4, the sodium hydroxide storage tank 1 is used for storing sodium hydroxide solution; the liquid inlet end of the first stage nickel-cobalt precipitation bottom stream storage tank 2 is communicated with a first stage nickel-cobalt precipitation device, and is used for storing part of the bottom stream of the first stage nickel-cobalt precipitation; the liquid inlets of the sodium hydroxide storage tank 1, the first stage nickel-cobalt precipitation bottom stream storage tank 2, the dilution liquid introduction mechanism 3 and the seed tank 4 are communicated, respectively introducing sodium hydroxide solution, first stage nickel-cobalt precipitation bottom stream and dilution liquid into the seed tank 4, and the liquid outlet of the seed tank 4 is communicated with the first stage nickel-cobalt precipitation device.

[0029] In the present application, the sodium hydroxide solution, the first stage nickel-cobalt precipitation bottom stream and the dilution liquid are mixed to form a precipitant, which is then sent into the first stage nickel-cobalt precipitation device; on the one hand, the nickel-cobalt hydroxide crystals in the first stage nickel-cobalt precipitation bottom stream are added into the first stage nickel-cobalt precipitation device as seeds to promote the better crystallization and growth of the nickel-cobalt hydroxide crystals in the first stage nickel-cobalt precipitation device; on the other hand, the sodium hydroxide solution is diluted to ensure that there is no local over-alkaline condition after being added into the first stage nickel-cobalt precipitation device, thereby guaranteeing the nickel-cobalt precipitation effect in the first stage nickel-cobalt precipitation device and improving the quality of MHP products.

[0030] In the present embodiment, the sodium hydroxide storage tank 1 stores sodium hydroxide solution.

[0031] In the present embodiment, the liquid inlet end of the first stage nickel-cobalt precipitation bottom stream storage tank 2 is connected with the bottom pipeline of the first stage nickel-cobalt precipitation device, and is used for storing part of the bottom stream of the first stage nickel-cobalt precipitation.

[0032] The dilution liquid introduction mechanism 3 is used for introducing and adjusting multiple dilution liquids.

[0033] The dilution liquid introduction mechanism 3 comprises an industrial water storage tank 31, the liquid outlet end of the industrial water storage tank 31 is connected with the liquid inlet pipeline of the seed tank 4, and is used for introducing industrial water into the seed tank 4.

[0034] In some possible embodiments, the dilution liquid introduction mechanism 3 further comprises a post-manganese removal liquid tank 32, the inlet of which is connected to the overflow pipe of the post-manganese removal thickener, and the outlet of which is connected to the inlet of the seed tank. The post-manganese removal liquid tank 32 is used to introduce the post-manganese removal liquid as the dilution liquid into the seed tank 4. The advantage is that, on the one hand, the problem of dilution with industrial water is avoided, and water resources are saved; on the other hand, the post-manganese removal liquid contains magnesium ions, and the reaction of sodium hydroxide solution with magnesium ions will form magnesium hydroxide precipitate, but the reaction of magnesium with sodium hydroxide is slow, and the formed crystal is small. When the mixed solution is injected into the first-stage nickel-cobalt precipitation device, the magnesium hydroxide precipitate can be quickly dissolved due to the large amount of solution in the first-stage nickel-cobalt precipitation device, thus achieving the effect of slow release of lye, and ensuring that there is no local over-alkaline condition in the first-stage nickel-cobalt precipitation device.

[0035] In some possible embodiments, the dilution liquid introduction mechanism 3 further comprises a post-manganese removal liquid tank 32, the inlet of which is connected to the overflow pipe of the post-manganese removal thickener, and the outlet of which is connected to the inlet of the seed tank. The post-manganese removal liquid tank 32 is used to introduce the post-manganese removal liquid as the dilution liquid into the seed tank 4. The advantage is that, on the one hand, the problem of dilution with industrial water is avoided, and water resources are saved; on the other hand, the post-manganese removal liquid contains magnesium ions, and the reaction of sodium hydroxide solution with magnesium ions will form magnesium hydroxide precipitate, but the reaction of magnesium with sodium hydroxide is slow, and the formed crystal is small. When the mixed solution is injected into the first-stage nickel-cobalt precipitation device, the magnesium hydroxide precipitate can be quickly dissolved due to the large amount of solution in the first-stage nickel-cobalt precipitation device, thus achieving the effect of slow release of lye, and ensuring that there is no local over-alkaline condition in the first-stage nickel-cobalt precipitation device.

[0036] In some possible embodiments, the dilution liquid introduction mechanism 3 further comprises a controller, an industrial water flow detector 34, a post-manganese removal liquid control valve 35, and a two-stage nickel-cobalt removal clear liquid control valve 36. The industrial water flow detector 34 is arranged on a pipeline between the industrial water storage tank 31 and the seed tank 4, and is configured to detect the flow of industrial water. The post-manganese removal liquid control valve 35 is arranged on a pipeline between the post-manganese removal liquid tank 32 and the seed tank 4, and is configured to control the supply of the post-manganese removal liquid. The two-stage nickel-cobalt removal clear liquid control valve 36 is arranged on a pipeline between the two-stage nickel-cobalt removal clear liquid storage tank 33 and the seed tank 4, and is configured to control the supply of the two-stage nickel-cobalt removal clear liquid. The controller is electrically connected to the industrial water flow detector 34, the post-manganese removal liquid control valve 35, and the two-stage nickel-cobalt removal clear liquid control valve 36, and is configured to control the opening and closing of the post-manganese removal liquid control valve 35 and the two-stage nickel-cobalt removal clear liquid control valve 36 according to the detection result of the industrial water flow detector 34.

[0037] The laterite nickel ore is mainly distributed in the tropical and subtropical regions, and is relatively dry in winter, and water shortage often occurs. At this time, the industrial water is prone to be insufficient. When the industrial water flow detector 34 detects that the flow of industrial water is less than a preset value, the controller can adjust the opening and closing of the post-manganese removal liquid control valve 35 and the two-stage nickel-cobalt removal clear liquid control valve 36 to supply the post-manganese removal liquid and the two-stage nickel-cobalt removal clear liquid as the dilution liquid.

[0038] In the embodiment, a dilution liquid inlet is arranged on the side wall of the bottom of the seed tank 4, and is in communication with the dilution liquid introduction mechanism 3. A sodium hydroxide inlet and a first-stage nickel-cobalt precipitation underflow inlet are arranged on the top of the seed tank 4, and are in communication with the sodium hydroxide storage tank 1 and the first-stage nickel-cobalt precipitation underflow storage tank 2, respectively. A mixed liquid discharge pipe 41 is arranged on the other side wall of the bottom of the seed tank 4, and is in communication with the top of the first-stage nickel-cobalt precipitation device.

[0039] In the embodiment, the mixed liquid discharge pipe 41 is provided with a discharge control valve. By controlling the opening and closing of the discharge control valve, the mixing time of the solutions in the seed tank 4 can be controlled, so that the solutions can be fully mixed.

[0040] The mixed liquid discharge pipe 41 extends to form a plurality of liquid discharge branch pipes at an end away from the seed tank 4. The plurality of liquid discharge branch pipes are arranged uniformly in the circumferential direction of the first-stage nickel-cobalt precipitation device, and are in communication with the top of the first-stage nickel-cobalt precipitation device. In this way, the mixed liquid can be injected into the first-stage nickel-cobalt precipitation device from multiple points, so that the input uniformity can be improved, and the reaction rate can be improved.

[0041] In the embodiment, the stirring device 5 is further included, which comprises a stirring motor, a speed reducer, a shaft coupling and a stirring rod, the stirring motor, the speed reducer and the shaft coupling are sequentially connected, the output end of the shaft coupling is coaxially fixed with the stirring rod, one end of the stirring rod extends into the seed tank 4, and a plurality of stirring blades are arranged on the end of the stirring rod in the seed tank 4. The stirring motor drives the stirring rod to rotate through the speed reducer and the shaft coupling, and the stirring rod stirs the solution in the seed tank 4 so that the solution can be fully mixed.

[0042] In order to better understand the present application, the technical solutions of the present application will be described in detail in combination with the drawings:

[0043] Firstly, the ore slurry to be treated is introduced into the first nickel-cobalt precipitation reaction tank, the sodium hydroxide storage tank 1, the first nickel-cobalt underflow storage tank 2 and the dilution liquid introduction mechanism 3 respectively input sodium hydroxide solution, first nickel-cobalt underflow and dilution liquid into the seed tank 4, and mix them in the seed tank 4, the stirring motor drives the stirring rod to rotate through the speed reducer and the shaft coupling, the stirring rod stirs the solution in the seed tank 4 so that the solution can be fully mixed, when the solution in the seed tank 4 is fully mixed, the discharge control valve is opened, and the mixed liquid is injected into the first nickel-cobalt precipitation device through the mixed liquid discharge pipe 41; the liquid of the first nickel-cobalt precipitation device is discharged into the first nickel-cobalt thickener for thickening, part of the underflow of the first nickel-cobalt thickener is discharged into the first nickel-cobalt underflow storage tank 2, and the other part of the underflow forms MHP product, the overflow liquid of the first nickel-cobalt thickener is sent to the second nickel-cobalt precipitation reaction tank, the liquid of the second nickel-cobalt precipitation reaction tank is sent to the second nickel-cobalt thickener for thickening, part of the overflow liquid of the second nickel-cobalt thickener is sent to the second nickel-cobalt removal clear liquid storage tank 33, and the other overflow liquid of the second nickel-cobalt thickener is sent to the manganese removal reaction tank, the liquid generated by the manganese removal reaction tank is sent to the manganese removal thickener for thickening, part of the overflow liquid of the manganese removal thickener is sent to the manganese removal post-liquid tank 32, and the underflow of the manganese removal thickener forms manganese-related product. The dilution liquid introduced by the dilution liquid introduction mechanism 3 can be one or more of industrial water, manganese removal post-liquid and second nickel-cobalt removal clear liquid; the controller controls the opening and closing of the manganese removal post-liquid control valve 35 and the second nickel-cobalt removal clear liquid control valve 36 according to the detection result of the industrial water flow detector 34 to adjust the dilution liquid.

[0044] The application has the beneficial effects that the preparation system of the precipitant for MHP precipitation provided by the application comprises a sodium hydroxide storage tank, a first-stage nickel-cobalt precipitation underflow storage tank, a dilution liquid introduction mechanism and a seed tank, the sodium hydroxide storage tank is used for storing a sodium hydroxide solution; the liquid inlet end of the first-stage nickel-cobalt precipitation underflow storage tank is communicated with a first-stage nickel-cobalt precipitation device, and is used for storing part of underflow of the first-stage nickel-cobalt precipitation; the sodium hydroxide storage tank, the first-stage nickel-cobalt precipitation underflow storage tank, the dilution liquid introduction mechanism and the liquid inlet of the seed tank are communicated, and the sodium hydroxide solution, the first-stage nickel-cobalt precipitation underflow and the dilution liquid are introduced into the seed tank, respectively, and the liquid outlet of the seed tank is communicated with the first-stage nickel-cobalt precipitation device. The sodium hydroxide solution, the first-stage nickel-cobalt precipitation underflow and the dilution liquid are mixed to form a precipitant, and then are sent into the first-stage nickel-cobalt precipitation device; on the one hand, the nickel-cobalt hydroxide crystals in the first-stage nickel-cobalt precipitation underflow are added into the first-stage nickel-cobalt precipitation device as seeds to promote the better crystallization and growth of the nickel-cobalt hydroxide crystals in the first-stage nickel-cobalt precipitation device; on the other hand, the sodium hydroxide solution is diluted to ensure that no local over-alkaline condition occurs after being added into the first-stage nickel-cobalt precipitation device, thereby guaranteeing the nickel-cobalt precipitation effect in the first-stage nickel-cobalt precipitation device and improving the quality of MHP products.

[0045] The specific embodiments of the application described above do not constitute a limitation on the protection scope of the application. Any various other corresponding changes and modifications made according to the technical concept of the application shall be included in the protection scope of the claims of the application.

Claims

1. A system for producing a precipitant for MHP precipitation, for producing a precipitant for use in a nickel-cobalt precipitation section, characterized in that, The application relates to a device for preparing a seed crystal tank, which comprises the following components: a sodium hydroxide storage tank for storing a sodium hydroxide solution; a first-stage nickel-cobalt precipitation underflow storage tank, which is in communication with the first-stage nickel-cobalt precipitation device and is used for storing the underflow of the first-stage nickel-cobalt precipitation; a dilution liquid introduction mechanism; and a seed crystal tank, which is in communication with the sodium hydroxide storage tank, the first-stage nickel-cobalt precipitation underflow storage tank and the dilution liquid introduction mechanism, and is used for introducing the sodium hydroxide solution, the first-stage nickel-cobalt precipitation underflow and the dilution liquid into the seed crystal tank, respectively, and is in communication with the first-stage nickel-cobalt precipitation device. The dilution liquid introduction mechanism is used for introducing and adjusting multiple dilution liquids.

2. The preparation system of a precipitant for MHP deposition according to claim 1, characterized by, The dilution liquid introduction mechanism comprises an industrial water storage tank, and the outlet end of the industrial water storage tank is in pipeline connection with the inlet of the seed crystal tank.

3. The preparation system of a precipitant for MHP deposition according to claim 2, characterized by, The dilution liquid introduction mechanism further comprises a post-manganese removal liquid tank, the outlet end of the post-manganese removal liquid tank is in pipeline connection with the inlet of the seed crystal tank, and the inlet end of the post-manganese removal liquid tank is in pipeline connection with the overflow end of a post-manganese removal thickener.

4. The preparation system of a precipitant for MHP deposition according to claim 3, characterized by, The dilution liquid introduction mechanism further comprises a second-stage nickel-cobalt removal clear liquid storage tank, the inlet end of the second-stage nickel-cobalt removal clear liquid storage tank is in pipeline connection with a second-stage nickel-cobalt removal device, and the outlet end of the second-stage nickel-cobalt removal clear liquid storage tank is in pipeline connection with the inlet of the seed crystal tank.

5. The system for preparing a precipitant for MHP precipitation according to claim 4, wherein The dilution liquid introduction mechanism further comprises a controller, an industrial water flow detector, a post-manganese removal liquid control valve and a second-stage nickel-cobalt removal clear liquid control valve, the industrial water flow detector is arranged on the pipeline between the industrial water storage tank and the seed crystal tank and is used for detecting the industrial water flow, the post-manganese removal liquid control valve is arranged on the pipeline between the post-manganese removal liquid tank and the seed crystal tank and is used for controlling the supply of the post-manganese removal liquid, the second-stage nickel-cobalt removal clear liquid control valve is arranged on the pipeline between the second-stage nickel-cobalt removal clear liquid storage tank and the seed crystal tank and is used for controlling the supply of the second-stage nickel-cobalt removal clear liquid, and the controller is electrically connected with the industrial water flow detector, the post-manganese removal liquid control valve and the second-stage nickel-cobalt removal clear liquid control valve and is used for controlling the opening and closing of the post-manganese removal liquid control valve and the second-stage nickel-cobalt removal clear liquid control valve according to the detection result of the industrial water flow detector.

6. The preparation system of a precipitant for MHP deposition according to claim 5, wherein A dilution liquid inlet is arranged on the side wall of the bottom of the seed crystal tank, the dilution liquid inlet is in communication with the dilution liquid introduction mechanism, a sodium hydroxide inlet and a first-stage nickel-cobalt precipitation underflow inlet are arranged on the top of the seed crystal tank and are in communication with the sodium hydroxide storage tank and the first-stage nickel-cobalt precipitation underflow storage tank, respectively, and a mixed liquid discharge pipe is arranged on the other side wall of the bottom of the seed crystal tank and is in communication with the top of the first-stage nickel-cobalt precipitation device.

7. The preparation system of a precipitant for MHP deposition according to claim 1, wherein A discharge control valve is arranged on the mixed liquid discharge pipe, and the mixing time of the solutions in the seed crystal tank is controlled by controlling the opening and closing of the discharge control valve.

8. The system for preparing a precipitant for MHP precipitation according to claim 7, wherein The mixed liquid discharge pipe extends to form multiple discharge branch pipes at the end away from the seed crystal tank, the multiple discharge branch pipes are arranged uniformly along the circumference of the first-stage nickel-cobalt precipitation device and are in communication with the top of the first-stage nickel-cobalt precipitation device.

9. The system for preparing a precipitant for MHP precipitation according to claim 8, wherein ​ 10. The system for preparing a precipitant for MHP precipitation according to claim 1, wherein Also include stirring device, the stirring device includes stirring motor, speed reducer, shaft coupling and stirring rod, the stirring motor, the speed reducer, the shaft coupling are connected in proper order, the output end of the shaft coupling is coaxial with the stirring rod Fixed, one end of the stirring rod extends into the seed tank, a plurality of stirring blades are arranged on one end of the stirring rod in the seed tank.

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