Preparation system of precipitant for precipitating MHP

Abstract

The invention discloses a preparation system of a precipitant for precipitating MHP, which comprises a sodium hydroxide storage tank, a first-section nickel and cobalt precipitation underflow storage tank, a diluent introduction mechanism and a seed crystal tank, and the sodium hydroxide storage tank is used for storing a sodium hydroxide solution; the liquid inlet end of the first-section nickel and cobalt precipitation underflow storage tank is communicated with the first-section nickel and cobalt precipitation device and is used for storing part of underflow of the first-section nickel and cobalt precipitation device; the sodium hydroxide storage tank, the first-section nickel and cobalt precipitation underflow storage tank and the diluent leading-in mechanism are communicated with a liquid inlet of the seed crystal tank, a sodium hydroxide solution, first-section nickel and cobalt precipitation underflow and diluent are respectively led into the seed crystal tank, and a liquid outlet of the seed crystal tank is communicated with the first-section nickel and cobalt precipitation device. According to the method, the cobalt nickel hydroxide crystals in the first-section nickel and cobalt precipitation underflow serve as seed crystals to be added into the first-section nickel and cobalt precipitation device, so that the cobalt nickel hydroxide crystals in the first-section nickel and cobalt precipitation device are promoted to crystallize and grow better; and the sodium hydroxide solution can be diluted, so that after the sodium hydroxide solution is added into the first-section nickel and cobalt precipitation device, the local over-alkali condition is avoided, and the quality of an MHP product is improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydrometallurgy, and in particular to a system for preparing a precipitant for precipitation of MHP. Background Art

[0002] Laterite nickel ore is a loose clay-like multi-mineral aggregate formed by long-term weathering, leaching, impregnation, alteration and other geological processes of nickel-bearing olivine bedrock 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 nickel-cobalt precipitation tank. The precipitation pH difference of different metal ions is used to realize the precipitation and separation of nickel and cobalt ions, so as to achieve the purpose of nickel and cobalt purification.

[0004] However, the problem is that in industrial production, when a large amount of sodium hydroxide solution is added, there will be local over-alkalinity in the nickel-cobalt precipitation tank, that is, the pH of the local aqueous solution is too high, which will lead to the simultaneous precipitation of multiple metal ions. This makes the precipitated product contain more impurities, and the quality of the MHP product finally precipitated is not high. Summary of the invention

[0005] The purpose of the present application is to overcome the above technical deficiencies, propose a preparation system for a precipitant for precipitation of MHP, and solve the technical problem in the prior art that the quality of MHP products is low due to local over-alkali.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions: The present application provides a system for preparing a precipitant for precipitation of MHP, comprising: Sodium hydroxide storage tank, used to store sodium hydroxide solution; A first stage nickel-cobalt precipitation underflow storage tank, whose liquid inlet end is connected to the first stage nickel-cobalt precipitation device, and is used to store part of the underflow of the first stage nickel-cobalt precipitation; a diluent introduction mechanism; and The seed tank, the sodium hydroxide storage tank, the first stage nickel-cobalt precipitation underflow storage tank, and the diluent introduction mechanism are connected with the liquid inlet of the seed tank, and the sodium hydroxide solution, the first stage nickel-cobalt precipitation underflow and the diluent are respectively introduced into the seed tank, and the liquid outlet of the seed tank is connected with the first stage nickel-cobalt precipitation device.

[0007] In some embodiments, the diluent introduction mechanism is used to introduce and prepare multiple diluents.

[0008] In some embodiments, the diluent introduction mechanism comprises an industrial water storage tank, and the liquid outlet of the industrial water storage tank is connected to the liquid inlet pipeline of the seed tank.

[0009] In some embodiments, the diluent introduction mechanism further comprises a manganese-removed liquid tank, the liquid outlet of the manganese-removed liquid tank is connected to the liquid inlet pipeline of the seed tank, and the liquid inlet of the manganese-removed liquid tank is connected to the overflow end pipeline of the manganese-removed thickener. The overflow end of the manganese-removed thickener pours the manganese-removed liquid into the manganese-removed liquid tank, and the manganese-removed liquid tank is used to introduce the manganese-removed liquid as a diluent into the seed tank.

[0010] In some embodiments, the dilution liquid introduction mechanism also includes a two-stage nickel-cobalt removal clear liquid storage tank, the liquid inlet end of the two-stage nickel-cobalt removal clear liquid storage tank is connected to the two-stage nickel-cobalt removal device pipeline, and the liquid outlet end of the two-stage nickel-cobalt removal clear liquid storage tank is connected to the liquid inlet pipeline of the seed tank.

[0011] In some embodiments, the dilution liquid introduction mechanism also includes a controller, an industrial water flow detector, a manganese removal liquid control valve, and a two-stage nickel and 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 industrial water flow. The manganese removal liquid control valve is arranged on the pipeline between the manganese removal liquid tank and the seed tank, and is used to control the supply of manganese removal liquid; the two-stage nickel and cobalt removal clear liquid control valve is arranged on the pipeline between the two-stage nickel and cobalt removal clear liquid storage tank and the seed tank, and is used to control the supply of the two-stage nickel and cobalt removal clear liquid. The controller is electrically connected to the industrial water flow detector, the manganese removal liquid control valve, and the two-stage nickel and cobalt removal clear liquid control valve, and is used to control the opening and closing of the manganese removal liquid control valve and the two-stage nickel and cobalt removal clear liquid control valve according to the detection result of the industrial water flow detector.

[0012] In some embodiments, a diluent inlet is provided on the side wall at the bottom of the seed tank, and the diluent inlet is connected to the diluent introduction mechanism. A sodium hydroxide inlet and a section of nickel-cobalt precipitation underflow inlet are provided on the top of the seed tank, which are respectively connected to the sodium hydroxide storage tank and the section of nickel-cobalt precipitation underflow storage tank. A mixed liquid discharge pipe is provided on the other side wall at the bottom of the seed tank, and the mixed liquid discharge pipe is connected to the top of a section of nickel-cobalt precipitation device.

[0013] In some embodiments, a discharge control valve is provided on the mixed solution discharge pipe, and the mixing time of each solution in the seed tank is controlled by controlling the opening and closing of the discharge control valve.

[0014] In some embodiments, the mixed liquid discharge pipe extends away from one end of the seed tank to form a plurality of drainage branches, and the plurality of drainage branches are evenly arranged along the circumference of a section of the nickel-cobalt precipitation device and connected to the top of a section of the nickel-cobalt precipitation device.

[0015] In some embodiments, a stirring device is also included, which includes a stirring motor, a reducer, a coupling and a stirring rod. The stirring motor, the reducer and the coupling are connected in sequence, and 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 provided on the end of the stirring rod located in the seed tank.

[0016] Compared with the prior art, the present application provides a system for preparing a precipitant for MHP precipitation, comprising a sodium hydroxide storage tank, a first-stage nickel-cobalt precipitation underflow storage tank, a diluent introduction mechanism and a seed tank, wherein the sodium hydroxide storage tank is used to store a sodium hydroxide solution; the liquid inlet end of the first-stage nickel-cobalt precipitation underflow storage tank is connected to a first-stage nickel-cobalt precipitation device, and is used to store a part of the underflow of a first-stage nickel-cobalt precipitation; the sodium hydroxide storage tank, the first-stage nickel-cobalt precipitation underflow storage tank, and the diluent introduction mechanism are connected to the liquid inlet of the seed tank, and the sodium hydroxide solution, the first-stage nickel-cobalt precipitation underflow and the diluent are respectively introduced into the seed tank, and the liquid outlet of the seed tank is connected to the first-stage nickel-cobalt precipitation device. In the present application, a sodium hydroxide solution, a nickel-cobalt precipitation underflow and a diluent are mixed to form a precipitant, which is then fed into a nickel-cobalt precipitation device; on the one hand, the nickel-cobalt hydroxide crystals in the nickel-cobalt precipitation underflow are added into the nickel-cobalt precipitation device as seeds to promote better crystallization and growth of the nickel-cobalt hydroxide crystals in the nickel-cobalt precipitation device; on the other hand, the sodium hydroxide solution is diluted to ensure that after being added into the nickel-cobalt precipitation device, there will be no local over-alkalinity, thereby ensuring the nickel-cobalt precipitation effect in the nickel-cobalt precipitation device and improving the quality of the MHP product.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the preferred embodiments of the present application are described in detail as follows in conjunction with the accompanying drawings. The specific implementation methods of the present application are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a system for preparing a precipitant for MHP precipitation provided in the present application.

[0019] Description of reference numerals: 1-sodium hydroxide storage tank, 2-first stage nickel-cobalt underflow storage tank, 3-dilution liquid introduction mechanism, 31-industrial water storage tank, 32-manganese removal liquid tank, 33-second stage nickel-cobalt removal clear liquid storage tank, 34-industrial water flow detector, 35-manganese removal liquid control valve, 36-second stage nickel-cobalt removal clear liquid control valve, 4-seed tank, 41-mixed liquid discharge pipe, 5-stirring device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] See also Figure 1 The present application provides a system for preparing a precipitant for MHP precipitation, comprising: a sodium hydroxide storage tank 1, a first-stage nickel-cobalt precipitation underflow storage tank 2, a diluent introduction mechanism 3 and a seed tank 4, wherein the sodium hydroxide storage tank 1 is used to store a sodium hydroxide solution; the liquid inlet end of the first-stage nickel-cobalt precipitation underflow storage tank 2 is connected to a first-stage nickel-cobalt precipitation device, and is used to store a part of the underflow of a first-stage nickel-cobalt precipitation; the sodium hydroxide storage tank 1, the first-stage nickel-cobalt precipitation underflow storage tank 2, and the diluent introduction mechanism 3 are connected to the liquid inlet of the seed tank 4, and the sodium hydroxide solution, a first-stage nickel-cobalt precipitation underflow and the diluent are introduced into the seed tank 4 respectively, and the liquid outlet of the seed tank 4 is connected to the first-stage nickel-cobalt precipitation device.

[0022] In the present application, a sodium hydroxide solution, a nickel-cobalt precipitation underflow and a diluent are mixed to form a precipitant, which is then sent into a nickel-cobalt precipitation device; on the one hand, the nickel-cobalt hydroxide crystals in the nickel-cobalt precipitation underflow are added into the nickel-cobalt precipitation device as seeds to promote better crystallization and growth of the nickel-cobalt hydroxide crystals in the nickel-cobalt precipitation device; on the other hand, the sodium hydroxide solution is diluted to ensure that there will be no local over-alkalinity after being added into the nickel-cobalt precipitation device, thereby ensuring the nickel-cobalt precipitation effect in the nickel-cobalt precipitation device and improving the quality of the MHP product.

[0023] In this embodiment, the sodium hydroxide storage tank 1 stores sodium hydroxide solution.

[0024] In this embodiment, the liquid inlet end of the one-stage nickel-cobalt precipitation underflow storage tank 2 is connected to the bottom pipeline of the one-stage nickel-cobalt precipitation device, and is used to store part of the underflow of one-stage nickel-cobalt precipitation.

[0025] The diluent introduction mechanism 3 is used to introduce and mix a variety of diluents.

[0026] The diluent introduction mechanism 3 comprises an industrial water storage tank 31 , the liquid outlet of the industrial water storage tank 31 is connected to the liquid inlet pipeline of the seed crystal tank 4 , and is used to introduce industrial water into the seed crystal tank 4 .

[0027] In some feasible embodiments, the dilution liquid introduction mechanism 3 also includes a manganese removal liquid tank 32, the liquid inlet end of the manganese removal liquid tank 32 is connected to the overflow end pipeline of the manganese removal thickener, and the dilution liquid introduction mechanism also includes a manganese removal liquid tank, and the liquid outlet end of the manganese removal liquid tank is connected to the liquid inlet pipeline of the seed tank. The manganese removal liquid tank 32 is used to introduce the manganese removal liquid into the seed tank 4 as a dilution liquid. Its advantage is that, on the one hand, it avoids the problem of dilution with industrial water and saves water resources; on the other hand, the manganese removal liquid contains magnesium ions, and the sodium hydroxide solution reacts with the magnesium ions to form magnesium hydroxide precipitation, but the reaction time of magnesium and sodium hydroxide is slow, and the formed crystals are small. When the mixed solution is injected into a nickel-cobalt precipitation device, since a large amount of solution is contained in the nickel-cobalt precipitation device, the magnesium hydroxide precipitation can be quickly dissolved, which has the effect of slow release of alkali solution, ensuring that there will be no local over-alkali in the nickel-cobalt precipitation device.

[0028] In some feasible embodiments, the dilution liquid introduction mechanism 3 also includes a two-stage nickel-cobalt removal clear liquid storage tank 33, the liquid inlet end of the two-stage nickel-cobalt removal clear liquid storage tank 33 is connected to the pipeline of the two-stage nickel-cobalt removal device, and the liquid outlet end of the two-stage nickel-cobalt removal clear liquid storage tank 33 is connected to the liquid inlet pipeline of the seed tank 4. Its advantage is that, on the one hand, it avoids the problem of dilution with industrial water and saves water resources; on the other hand, the two-stage nickel-cobalt removal clear liquid contains manganese and magnesium ions, and the sodium hydroxide solution reacts with manganese and magnesium ions to form magnesium hydroxide and manganese hydroxide precipitates, but the reaction time of manganese and magnesium ions with sodium hydroxide is slow, and the formed crystals are small. When the mixed solution is injected into the one-stage nickel-cobalt precipitation device, since the one-stage nickel-cobalt precipitation device contains a large amount of solution, the magnesium hydroxide and manganese hydroxide precipitates can be quickly dissolved, which has the effect of slow release of alkali solution, ensuring that there will be no local over-alkali in the one-stage nickel-cobalt precipitation device.

[0029] In some feasible embodiments, the diluent introduction mechanism 3 also includes a controller, an industrial water flow detector 34, a manganese removal liquid control valve 35, and a second-stage nickel-cobalt removal clear liquid control valve 36. The industrial water flow detector 34 is arranged on the pipeline between the industrial water storage tank 31 and the seed tank 4, and is used to detect the industrial water flow. The manganese removal liquid control valve 35 is arranged on the pipeline between the manganese removal liquid tank 32 and the seed tank 4, and is used to control the supply of manganese removal liquid; the second-stage nickel-cobalt removal clear liquid control valve 36 is arranged on the pipeline between the second-stage nickel-cobalt removal clear liquid storage tank 33 and the seed tank 4, and is used to control the supply of the second-stage nickel-cobalt removal clear liquid. The controller is electrically connected to the industrial water flow detector 34, the manganese removal liquid control valve 35, and the second-stage nickel-cobalt removal clear liquid control valve 36, and is used to control the opening and closing of the manganese removal liquid control valve 35 and the second-stage nickel-cobalt removal clear liquid control valve 36 according to the detection result of the industrial water flow detector 34.

[0030] Laterite nickel ore is mostly distributed in tropical and subtropical areas, which are relatively dry in winter and often suffer from water shortages. At this time, industrial water is prone to be insufficient; when the industrial water flow detector 34 detects that the industrial water flow is less than the preset value, the controller can adjust the manganese removal liquid control valve 35 and the second-stage nickel and cobalt removal clear liquid control valve 36 to open and close the supply of manganese removal liquid and the second-stage nickel and cobalt removal clear liquid as diluent.

[0031] In this embodiment, a diluent inlet is provided on the side wall at the bottom of the seed tank 4, and the diluent inlet is connected to the diluent introduction mechanism 3. A sodium hydroxide inlet and a first-stage nickel-cobalt precipitation underflow inlet are provided on the top of the seed tank 4, which are respectively connected to the sodium hydroxide storage tank 1 and the first-stage nickel-cobalt precipitation underflow storage tank 2. A mixed liquid discharge pipe 41 is provided on the other side wall of the bottom of the seed tank 4, and the mixed liquid discharge pipe 41 is connected to the top of a first-stage nickel-cobalt precipitation device.

[0032] In this embodiment, a discharge control valve is provided on the mixed solution discharge pipe 41. By controlling the opening and closing of the discharge control valve, the mixing time of each solution in the seed tank 4 is controlled to make them fully mixed.

[0033] The mixed liquid discharge pipe 41 extends from one end of the seed tank 4 to form a plurality of liquid discharge branches, which are evenly arranged along the circumference of a section of the nickel-cobalt precipitation device and are connected to the top of a section of the nickel-cobalt precipitation device, so that the mixed liquid can be injected into the section of the nickel-cobalt precipitation device at multiple points, which can improve the input uniformity and the reaction rate.

[0034] In this embodiment, a stirring device 5 is also included, and the stirring device 5 includes a stirring motor, a reducer, a coupling and a stirring rod. The stirring motor, the reducer and the coupling are connected in sequence, and the output end of the 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 provided on one end of the stirring rod located in the seed tank 4. The stirring motor drives the stirring rod to rotate through the reducer and the coupling, and the stirring rod stirs the solution in the seed tank 4 so that it can be fully mixed.

[0035] In order to better understand the present application, the technical solution of the present application is described in detail below with reference to the accompanying drawings: First, the ore pulp to be processed is introduced into a nickel-cobalt precipitation reaction tank, the sodium hydroxide storage tank 1, the nickel-cobalt precipitation underflow storage tank 2, and the diluent introduction mechanism 3 respectively input sodium hydroxide solution, a nickel-cobalt precipitation underflow, and diluent into the seed tank 4, and mix them in the seed tank 4, the stirring motor drives the stirring rod to rotate through the reducer and the coupling, and the stirring rod stirs the solution in the seed tank 4 to enable it to be fully mixed. When the solution in the seed tank 4 is fully mixed, the discharge control valve is opened, and the mixed solution is injected into a nickel-cobalt precipitation device through the mixed solution discharge pipe 41; a nickel-cobalt precipitation device The liquid is discharged into the first stage nickel-cobalt precipitation thickener for thickening, part of the underflow of the first stage nickel-cobalt precipitation thickener is discharged into the first stage nickel-cobalt precipitation underflow storage tank 2, and the other part of the underflow forms the MHP product. The overflow liquid of the first stage nickel-cobalt precipitation thickener is sent to the second stage nickel-cobalt precipitation reaction tank, the liquid of the second stage nickel-cobalt precipitation reaction tank is sent to the second stage nickel-cobalt precipitation thickener for thickening, part of the overflow liquid of the second stage nickel-cobalt precipitation thickener is sent to the second stage nickel-cobalt removal clear liquid storage tank 33, the other overflow liquid of the second stage nickel-cobalt precipitation thickener is sent to the manganese removal reaction tank, the liquid produced in 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 products.

[0036] Among them, the dilution liquid introduced by the dilution liquid introduction mechanism 3 can be one or more of industrial water, manganese-removed liquid and two-stage nickel-cobalt removal clear liquid; the dilution liquid is prepared by the controller controlling the opening and closing of the manganese-removed 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] Beneficial effects of the present application: The present application provides a system for preparing a precipitant for MHP precipitation, comprising a sodium hydroxide storage tank, a first-stage nickel-cobalt precipitation underflow storage tank, a diluent introduction mechanism and a seed tank, wherein the sodium hydroxide storage tank is used to store a sodium hydroxide solution; the liquid inlet end of the first-stage nickel-cobalt precipitation underflow storage tank is connected to a first-stage nickel-cobalt precipitation device, and is used to store a part of the underflow of a first-stage nickel-cobalt precipitation; the sodium hydroxide storage tank, the first-stage nickel-cobalt precipitation underflow storage tank, and the diluent introduction mechanism are connected to the liquid inlet of the seed tank, and the sodium hydroxide solution, a first-stage nickel-cobalt precipitation underflow and the diluent are respectively introduced into the seed tank, and the liquid outlet of the seed tank is connected to the first-stage nickel-cobalt precipitation device. In the present application, a sodium hydroxide solution, a nickel-cobalt precipitation underflow and a diluent are mixed to form a precipitant, which is then fed into a nickel-cobalt precipitation device; on the one hand, the nickel-cobalt hydroxide crystals in the nickel-cobalt precipitation underflow are added into the nickel-cobalt precipitation device as seeds to promote better crystallization and growth of the nickel-cobalt hydroxide crystals in the nickel-cobalt precipitation device; on the other hand, the sodium hydroxide solution is diluted to ensure that after being added into the nickel-cobalt precipitation device, there will be no local over-alkalinity, thereby ensuring the nickel-cobalt precipitation effect in the nickel-cobalt precipitation device and improving the quality of the MHP product.

[0038] The specific implementation methods of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A system for preparing a precipitant for MHP precipitation, used for preparing a precipitant injected into a nickel-cobalt precipitation device, characterized in that: include: Sodium hydroxide storage tank, used to store sodium hydroxide solution; A first stage nickel-cobalt precipitation underflow storage tank, whose liquid inlet end is connected to the first stage nickel-cobalt precipitation device, and is used to store part of the underflow of the first stage nickel-cobalt precipitation; diluent introduction mechanism; as well as The seed tank, the sodium hydroxide storage tank, the first stage nickel-cobalt precipitation underflow storage tank, and the diluent introduction mechanism are connected with the liquid inlet of the seed tank, and the sodium hydroxide solution, the first stage nickel-cobalt precipitation underflow and the diluent are respectively introduced into the seed tank, and the liquid outlet of the seed tank is connected with the first stage nickel-cobalt precipitation device.

2. The system for preparing a precipitant for MHP precipitation according to claim 1, characterized in that: The diluent introduction mechanism is used for introducing and mixing a variety of diluents.

3. The system for preparing a precipitant for MHP precipitation according to claim 2, characterized in that: The diluent introduction mechanism comprises an industrial water storage tank, and the liquid outlet end of the industrial water storage tank is connected to the liquid inlet pipeline of the seed crystal tank.

4. The system for preparing a precipitant for MHP precipitation according to claim 3, characterized in that: The diluent introduction mechanism also includes a manganese removal liquid tank, the liquid outlet of the manganese removal liquid tank is connected to the liquid inlet pipeline of the seed tank, and the liquid inlet of the manganese removal liquid tank is connected to the overflow end pipeline of the manganese removal thickener.

5. The system for preparing a precipitant for MHP precipitation according to claim 4, characterized in that: The diluent introduction mechanism also includes a two-stage nickel-cobalt removal clear liquid storage tank, the liquid inlet end of the two-stage nickel-cobalt removal clear liquid storage tank is connected to the two-stage nickel-cobalt removal device pipeline, and the liquid outlet end of the two-stage nickel-cobalt removal clear liquid storage tank is connected to the liquid inlet pipeline of the seed tank.

6. The system for preparing a precipitant for MHP precipitation according to claim 5, characterized in that: The diluent introduction mechanism also includes a controller, an industrial water flow detector, a manganese-removed liquid control valve, and a two-stage nickel-cobalt-removed 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 industrial water flow. The manganese-removed liquid control valve is arranged on the pipeline between the manganese-removed liquid tank and the seed tank, and is used to control the supply of manganese-removed liquid; the two-stage nickel-cobalt-removed clear liquid control valve is arranged on the pipeline between the two-stage nickel-cobalt-removed clear liquid storage tank and the seed tank, and is used to control the supply of the two-stage nickel-cobalt-removed clear liquid. The controller is electrically connected to the industrial water flow detector, the manganese-removed liquid control valve, and the two-stage nickel-cobalt-removed clear liquid control valve, and is used to control the opening and closing of the manganese-removed liquid control valve and the two-stage nickel-cobalt-removed clear liquid control valve according to the detection result of the industrial water flow detector.

7. The system for preparing a precipitant for MHP precipitation according to claim 1, characterized in that: A diluent inlet is provided on the side wall at the bottom of the seed crystal tank, and the diluent inlet is connected to the diluent introduction mechanism; a sodium hydroxide inlet and a first-stage nickel-cobalt precipitation underflow inlet are provided on the top of the seed crystal tank, which are respectively connected to the sodium hydroxide storage tank and the first-stage nickel-cobalt precipitation underflow storage tank; a mixed liquid discharge pipe is provided on the other side wall at the bottom of the seed crystal tank, and the mixed liquid discharge pipe is connected to the top of a first-stage nickel-cobalt precipitation device.

8. The system for preparing a precipitant for MHP precipitation according to claim 7, characterized in that: The mixed solution discharge pipe is provided with a discharge control valve, and the mixing time of each solution in the seed tank is controlled by controlling the opening and closing of the discharge control valve.

9. The system for preparing a precipitant for MHP precipitation according to claim 8, characterized in that: The mixed liquid discharge pipe extends from one end of the seed crystal tank to form a plurality of liquid discharge branches, and the plurality of liquid discharge branches are evenly arranged along the circumference of a section of the nickel-cobalt precipitation device and are connected to the top of a section of the nickel-cobalt precipitation device.

10. The system for preparing a precipitant for MHP precipitation according to claim 1, characterized in that: It also includes a stirring device, which includes a stirring motor, a reducer, a coupling and a stirring rod. The stirring motor, the reducer and the coupling are connected in sequence. The output end of the coupling is coaxially fixed with the stirring rod. One end of the stirring rod extends into the seed tank. A plurality of stirring blades are provided on one end of the stirring rod located in the seed tank.

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